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The best offline dictionary apps for Android and iOS are WordWeb for a genuinely free, ad-free English reference, Merriam-Webster for mainstream definitions and pronunciation, Oxford Dictionary & Thesaurus for premium reference features, and Dict Box for multilingual lookup. Most apps require a database download first, and “free download” does not always mean free offline access.
The shortlist below separates English dictionaries from translation apps, identifies Android and iPhone/iPad support, explains whether offline features are free or premium, and flags claims that need checking in the current app listing. Install and test the required language database over Wi-Fi before relying on any app without mobile data.
Key takeaways
- WordWeb is the strongest free, no-ad offline English dictionary choice, especially on Android, where it supports lookup from selected text in other apps.
- Merriam-Webster Dictionary offers offline definitions and synonyms, human-recorded pronunciation, examples, an integrated thesaurus, Word of the Day, and word games, but the free experience includes advertising or premium upselling.
- Oxford Dictionary & Thesaurus includes premium offline mode and full database access, so downloading the app for free does not make the complete offline reference free.
- Dict Box is the strongest verified multilingual option, but language databases must be downloaded and web-dictionary tabs or connected translation services may still require internet access.
- Livio English Dictionary – Offline is a lightweight Android option based on Wiktionary-derived content, while U Dictionary and Erudite are better treated as multilingual learning or translation tools.
- Offline access must be tested separately for definitions, examples, audio, translation, camera lookup, saved words, and synchronization; one working offline feature does not prove that the entire app works offline.
Quick comparison: which offline dictionary app should you download?
The table uses practical labels rather than treating every “offline” claim as equivalent. Confirmed means the supplied store or official listing advertises the feature; requires download means a language or dictionary package must be saved locally; premium means the current listing places the feature behind a paid tier; and needs verification means the available evidence does not establish current offline behavior.
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|---|---|---|---|---|---|---|---|
| WordWeb Dictionary | Free English dictionary and thesaurus | Yes | Yes | Core definitions and thesaurus advertised offline | English | Android listing says free and no advertisements | Not a multilingual translator; feature parity should be checked |
| Merriam-Webster Dictionary | Mainstream English reference and pronunciation | Yes | Yes | Definitions and synonyms advertised offline; audio offline status not established | English | Free app with ads or upselling; premium app adds ad-free and extra content | Primarily English-only |
| Oxford Dictionary & Thesaurus | Premium Oxford-branded reference | Store availability varies by platform and region | Yes in the cited listing | Premium offline and fast mode | Multiple dictionary resources and language options | Free download with premium in-app features | Full offline database is not a confirmed free feature |
| Dict Box | Multilingual dictionaries and translation | Yes | Yes | Offline dictionaries and translation advertised; packs required | More than 50 languages advertised on listings | Free download; ads or purchases should be checked in the current listing | Web tabs and connected services may remain online-only |
| English Dictionary – Offline by Livio | Lightweight Android English lookup | Yes | No matching iOS product verified | Dedicated offline English database | English; Livio publishes separate language apps | Free listing signal | Wiktionary-derived content and Android-only evidence |
| U Dictionary Translator | Multilingual learners | Yes in the cited listing | Requires separate confirmation | Downloadable offline packages advertised | 44 offline languages advertised | Free download; package and premium terms vary | Translation-oriented; some functions may need internet |
| Erudite Dictionary Translator | Language learners and travelers | Yes in the cited listing | Requires separate confirmation | Exact offline database behavior not established | Broad language support advertised | Current pricing and offline tier require checking | Language support is not proof of offline support |
| Dictionary.com: English Words | General English lookup if offline mode remains available | Verify current listing | Verify current listing | Not safely confirmed from current evidence | English | Older Pro and offline claims may no longer apply | Feature changes reported by users |
| Oxford Dictionary of English | Separate Oxford English reference product | Verify current listing | Separate iOS listings exist | Current offline terms require verification | English | Edition, developer, and pricing differ by listing | Not the Oxford English Dictionary and not interchangeable with Oxford Dictionary & Thesaurus |
1. WordWeb Dictionary: best free offline English dictionary
WordWeb Dictionary is the best first choice for readers who want a free, no-ad English dictionary that works without an internet connection. The Android listing advertises an offline English dictionary and thesaurus, synonyms, related words, and no advertisements. WordWeb also supports lookup from selected text in other Android apps through the text-selection menu; the listing says that integration requires Android M or later. See the WordWeb Android listing and the WordWeb iOS listing.
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Platforms: Android and iPhone/iPad listings are available. Do not assume that Android’s text-selection pop-up, pricing, or every thesaurus feature exists identically on iOS.
Offline capability: Core definitions and thesaurus content are advertised as offline. The available listing does not establish that every pronunciation or add-on feature works without connectivity, so test audio separately before travel.
Dictionary source and features: WordWeb is an English reference tool focused on definitions, synonyms, related words, and cross-references rather than translation or visual language lessons. The interface may feel less polished than commercial subscription products, but the direct offline design is its advantage.
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Who should skip it: Skip WordWeb if you need downloadable Spanish, Arabic, Chinese, or other language pairs, extensive human-recorded audio, or a full translator.
2. Merriam-Webster Dictionary: best mainstream English reference
Merriam-Webster Dictionary is the best mainstream English app for readers who want offline definitions alongside pronunciation, examples, thesaurus tools, and vocabulary features. The free iOS listing advertises offline access to definitions and synonyms, audio pronunciations by real English speakers, voice search, example sentences, an integrated thesaurus, Word of the Day, word games, favorites, and search history. The Merriam-Webster iOS listing, Merriam-Webster Android listing, and official Merriam-Webster app overview should be checked for current platform terms.
Platforms: Android and iPhone/iPad versions are listed. The cited iOS page specifies iOS 15.0 or later. A separate premium iOS product exists, so “Merriam-Webster” does not describe one uniform free-and-paid feature set.
Offline capability: Definitions and synonyms are explicitly advertised as offline. The listing promotes human-recorded audio, but the supplied evidence does not prove that every audio file is stored locally. Download the app, enable airplane mode, and test both a common and an obscure word before assuming offline pronunciation works.
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Learning features: Merriam-Webster is stronger than a bare dictionary because favorites, search history, Word of the Day, examples, games, and iCloud synchronization can support regular vocabulary practice. Synchronization, feeds, and games may require connectivity even when definitions are available offline.
Who should skip it: Skip Merriam-Webster if you need a free, ad-free app, multilingual offline translation, or certainty that pronunciation audio is available in airplane mode.
3. Oxford Dictionary & Thesaurus: best premium reference
Oxford Dictionary & Thesaurus is the best premium-oriented choice for users who want Oxford-branded reference content, etymology, synonyms, search assistance, and paid offline access. The current cited iOS listing advertises autocomplete, compound-word lookup, camera search, voice search, fuzzy search, etymology, synonyms, multiple language resources, premium audio, and premium offline and fast mode. See the Oxford Dictionary & Thesaurus iOS listing.
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Offline capability: The listing specifically places offline mode and unlimited database access among premium features. The app can therefore be free to download without being a fully free offline dictionary.
Platforms and publisher: The cited product is published by MobiSystems. Readers should identify the developer and exact product before installing because several Oxford-branded apps have similar names. Oxford Dictionary & Thesaurus should not be presented as the Oxford English Dictionary, which is a different publication.
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Search and lookup: Oxford’s advertised search tools are unusually useful for difficult lookups: fuzzy search can help with misspellings, compound-word lookup handles phrases, camera search can read text, and voice search can avoid typing. Camera and voice functions may require device permissions and may not work fully offline.
Who should skip it: Skip Oxford Dictionary & Thesaurus if the priority is a basic free offline database, if storage is limited, or if you need a simple multilingual translator rather than a premium reference suite.
4. Dict Box: best multilingual offline dictionary
Dict Box is the strongest verified choice for multilingual offline dictionaries and translation, provided that the required language packs are downloaded before going offline. The Android and iOS listings position Dict Box as an offline dictionary and translator and advertise support for more than 50 languages. The cited listings are the Dict Box Android page and the Dict Box iOS page.
Offline capability: Dict Box combines local offline resources with web dictionaries and external services. Download the specific language databases you need, then test each language pair in airplane mode. A working offline English definition does not prove that every translation tab, external dictionary, or web result is offline.
Languages: The listings include English, Spanish, French, German, Arabic, Chinese, Japanese, Korean, Hindi, Portuguese, Russian, and other languages. The advertised number of languages describes product support; it should not be interpreted as proof that every language has identical definitions, audio, examples, or translation quality.
Free versus paid: Dict Box is presented as a free download, but advertisements and in-app purchase terms should be checked on the current store page for the reader’s country and platform.
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5. English Dictionary – Offline by Livio: best lightweight Android option
English Dictionary – Offline by Livio is a strong lightweight Android choice for basic English lookup without mobile data. The dedicated Livio English Dictionary – Offline listing describes an offline English dictionary with bookmarks, personal notes, configuration backup, and local use. Livio also maintains a separate online and multilingual dictionary app, which should not be confused with the dedicated offline English package.
Platforms: The supplied evidence establishes an Android listing, not a matching iPhone/iPad product with comparable functionality. Livio should therefore be treated as Android-specific unless a current iOS listing is independently confirmed.
Dictionary source: The listing references Wiktionary-based content. Wiktionary can provide broad coverage and useful uncommon entries, but community-origin content is not the same editorial product as Merriam-Webster or Oxford. Definitions, labels, and consistency may vary by entry.
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Offline capability: The app is designed around a local English database. Read-aloud features may use the device’s text-to-speech engine, and text-to-speech availability or pronunciation quality can vary by Android device and installed language voice.
Who should skip it: Skip Livio if you use an iPhone or iPad, require professionally recorded pronunciation, or prefer an editorially uniform commercial dictionary.
6. U Dictionary Translator: best for multilingual learners
U Dictionary Translator is best for language learners who need downloadable multilingual resources, synonyms, antonyms, and translation-oriented study tools rather than only an English definition database. The cited U Dictionary Android listing advertises offline packages for 44 languages, synonym and antonym tools, Collins Advanced Dictionary and WordNet content, and learning features such as Word Lock Screen.
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Offline capability: Users must download the language packages they need. Package availability and size can vary by language. Dictionary definitions may work offline while machine translation, online examples, feeds, or other connected features remain unavailable.
Free versus paid: U Dictionary is presented as a free download, but package access, advertising, and premium terms should be checked for the current version and region.
Who should skip it: Skip U Dictionary if you want a minimal, ad-free monolingual dictionary with no translation extras or if you cannot spare storage for multiple language packages.
7. Erudite Dictionary Translator: promising for learners, but verify offline mode
Erudite Dictionary Translator is a plausible multilingual learning choice, but the available evidence does not clearly establish its exact offline database behavior. The current cited Erudite Android listing positions the app as a dictionary and translator and advertises languages including English, Spanish, French, German, Italian, Portuguese, Dutch, Greek, Russian, Chinese, Japanese, Korean, Arabic, and Hindi.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallOffline capability: Language support is not proof of offline support. Before relying on Erudite during travel, look for a downloadable dictionary or offline package inside the current app, download the required language, enable airplane mode, and test definitions, translations, audio, and saved words independently.
Platforms and pricing: The supplied research verifies an Android listing but does not establish equivalent iOS support, current offline terms, advertising, or premium pricing.
Who should skip it: Skip Erudite if offline use is non-negotiable and you cannot test the current build before departure. Dict Box has stronger verified evidence for the multilingual offline use case.
8. Dictionary.com: English Words: use only after a current offline test
Dictionary.com: English Words may be useful for general English lookup, but current offline access should not be treated as confirmed without checking the latest store listing and testing airplane mode. Older articles and references to “Dictionary.com Pro” may describe a different product or an earlier feature set. User reports on Dictionary.com feature changes and app reliability and offline changes are useful for identifying possible failure modes, but they do not establish official policy.
Platforms: Current Android and iPhone/iPad availability, developer identity, minimum operating-system versions, and feature parity must be checked immediately before publication or installation.
Offline capability: Do not promise offline definitions, audio, or a paid offline database based on older coverage. Install the current app while connected, search several entries, enable airplane mode, and repeat the test.
Who should skip it: Skip Dictionary.com if you need a dependable offline reference today and do not have time to verify the current build. WordWeb, Merriam-Webster, or Livio provide clearer evidence for specific use cases.
9. Oxford Dictionary of English: a separate product that needs verification
Oxford Dictionary of English should be evaluated as a separate Oxford product, not as another name for Oxford Dictionary & Thesaurus or the Oxford English Dictionary. The supplied research identifies separate iOS listings, including one Oxford Dictionary of English listing and another similarly named listing.
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Why the distinction matters: Similar names can conceal different developers, editions, databases, pricing models, supported operating systems, and offline rules. The Oxford English Dictionary is a different publication from Oxford Dictionary of English, and facts about one should not be transferred to the other.
Offline capability: The available evidence does not responsibly establish the current offline database, audio behavior, pricing, or Android/iOS parity for these separate listings. Check the developer, edition, update date, and offline terms in the exact store listing before choosing this app.
Who should skip it: Skip this product if you need a recommendation with already-confirmed offline behavior. Choose Oxford Dictionary & Thesaurus only when its premium terms meet your needs and the exact platform listing is correct.
10. Platform-specific language dictionaries: choose a verified language pair
A dedicated language-specific dictionary can be the best tenth choice when a reader needs one language pair, but the available research does not verify a current Android-and-iOS app with confirmed offline support. Suitable candidates include a dedicated bilingual Dict Box package or a language-specific app such as SpanishDict, but the current listing, developer, downloadable database, and airplane-mode behavior must be verified before publication or installation.
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Why this is more honest than a forced ranking: The available evidence does not establish two additional fully current Android-and-iOS products. A platform-specific, language-pair recommendation is safer than claiming that an identically named app has the same database and offline features on both operating systems.
What does “offline dictionary” actually mean?
An offline dictionary is one whose core definitions can be searched without Wi-Fi or mobile data after the required database has been installed or downloaded. Offline status is not binary because an app can store definitions locally while still requiring internet access for audio, translation, images, synchronization, camera processing, or external links.
| Offline level | What works without internet | What may still require internet |
|---|---|---|
| Full offline dictionary | Definitions and core entries work after installation or database download | Feeds, updates, synchronization, and external links may remain online-only |
| Partial offline | Definitions or synonyms work locally | Audio, examples, translation, images, camera search, or advanced tools may fail |
| Downloadable packages | Selected languages work after their databases are saved locally | Unselected languages and online translation services remain unavailable |
| Offline claim not verified | No dependable offline function can be promised | Current store documentation or an airplane-mode test is still required |
Before a trip, download the English or required language database over Wi-Fi. Download optional pronunciation or audio packages if the app provides them. Open common words, obscure words, phrases, synonyms, and saved entries once. Then enable airplane mode and repeat the searches. Test audio separately because an offline definition does not prove offline pronunciation.
How should you compare English dictionaries with multilingual translator apps?
Choose an English reference dictionary for editorial depth, usage information, and consistent English definitions; choose a multilingual translator for language pairs, travel phrases, and downloadable language packages. Merriam-Webster, WordWeb, and Oxford products are primarily English reference tools. Dict Box and U Dictionary are better suited to multilingual lookup, while Erudite is positioned around multilingual learning and translation.
| Need | Best-fitting category | Recommended candidates | Important trade-off |
|---|---|---|---|
| English definitions and thesaurus | Monolingual reference | WordWeb, Merriam-Webster, Oxford Dictionary & Thesaurus | These are not full multilingual translators |
| Pronunciation and usage examples | Mainstream English reference | Merriam-Webster; Oxford premium features | Offline audio must be tested separately |
| Several languages offline | Multilingual dictionary | Dict Box; U Dictionary | Language packs consume storage and may differ in depth |
| Lightweight Android lookup | Dedicated local database | Livio English Dictionary – Offline | Wiktionary-derived content and no verified iOS equivalent |
| Language learning | Translator and vocabulary app | U Dictionary; Erudite | Some learning or translation features may be online-only |
Which apps have the best pronunciation features?
Merriam-Webster has the clearest verified pronunciation advantage because its listing specifically advertises audio pronunciations by real English speakers. Merriam-Webster also advertises voice search, but the supplied listing does not establish that every audio file or voice function works offline. Oxford Dictionary & Thesaurus advertises premium audio, while Livio may rely on the device’s text-to-speech engine rather than bundled human recordings.
Check four separate details before choosing an app for pronunciation: whether recordings are human or text-to-speech, whether American and British variants are available, whether IPA or another phonetic spelling is shown, and whether audio remains playable in airplane mode. Voice search is a different feature from pronunciation playback and may require microphone permission or online processing.
Which apps offer the best search and learning tools?
Oxford offers the broadest advertised search toolkit, while Merriam-Webster offers the clearest combination of lookup and vocabulary practice. Oxford’s cited listing advertises autocomplete, compound-word lookup, camera search, voice search, fuzzy search, etymology, and synonyms. WordWeb is particularly useful for Android cross-app lookup through selected text. Merriam-Webster adds favorites, history, examples, Word of the Day, games, and iCloud synchronization on its iOS listing.
Search tools are not automatically offline tools. Camera OCR may need processing or permission, voice search needs a microphone and may need a network, Word of the Day is generally a feed, and cloud synchronization cannot work without a connection. Test each tool under airplane mode rather than inferring its behavior from the app’s general offline label.
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How do free, ad-supported, and premium offline apps differ?
“Free download” means only that installation does not require payment; it does not guarantee a free database, ad-free use, full content, or offline mode. WordWeb’s Android listing is the clearest no-ad free option in this research. Merriam-Webster offers a free app plus a premium product with additional content and no ads. Oxford Dictionary & Thesaurus advertises premium offline mode and database access. Dict Box and U Dictionary are free downloads with language-package or advertising terms that should be checked in the current store listing.
| Label | What the label really tells you | What to verify |
|---|---|---|
| Free download | The app can be installed without an upfront payment | Ads, account requirements, database downloads, and locked features |
| Free offline | Core local lookup is available without paying after setup | Whether audio, examples, thesaurus, and all needed languages are included |
| Ad-supported | The free experience may display advertising | Whether ads appear offline, whether tracking is used, and the ad-removal price |
| Premium offline | Offline mode or complete content requires an upgrade | Purchase type, platform, country, renewal terms, and included databases |
| Needs verification | The available evidence is too old or incomplete for a firm claim | Current store listing and a real airplane-mode test |
The research result showed a U.S. iOS price signal of $9.99 for Merriam-Webster’s premium listing, observed August 18, 2026. The price should not be generalized worldwide or described as a subscription or one-time purchase without checking the current checkout description.
How do you test an offline dictionary before traveling?
- Install while connected: Use Wi-Fi to install the app and complete its first-run setup.
- Download the database: Select English or each required language and wait for the package to finish. Download optional audio packs if offered.
- Test ordinary lookup: Search common words, irregular forms, phrases, compound words, synonyms, and at least one obscure entry.
- Test extras: Play pronunciation, open examples and etymology, inspect saved words, try voice or camera lookup, and check reverse translation.
- Enable airplane mode: Turn off both Wi-Fi and mobile data, then repeat every important test.
- Test another app: Use Android text selection, iOS sharing, or the relevant cross-app lookup feature if that workflow matters to you.
- Check persistence: Confirm that bookmarks, notes, history, and downloaded languages remain available after closing and reopening the app.
- Leave storage headroom: Check the app’s download size and language-package size in the current store or app settings. Do not rely on old user-posted figures.
- Reconnect for maintenance: Updates, new language packs, cloud backup, feeds, and synchronization generally require an internet connection.
What should you check for privacy and permissions?
Offline lookup does not automatically mean an app is privacy-safe. An app can search a local database without connectivity and still collect analytics, advertising identifiers, or usage data whenever the device reconnects.
Review the current store privacy disclosure and permissions for advertising and analytics, account requirements, clipboard or text-selection access, microphone access for voice search, camera access for OCR, location access, and cloud synchronization. A dictionary that offers tap-to-define or cross-app lookup may need access to selected text, while voice and camera features require device permissions. Reject permissions that are not necessary for the way you intend to use the app.
How much storage do offline dictionaries need?
Storage use depends on the base app, downloaded language databases, and optional audio files, so exact requirements should be checked in the current store listing or inside the app. Several language packs can consume substantially more space than one English database, and audio may be downloaded separately. The available evidence does not provide reliable current storage specifications for every candidate, so old user reports and search snippets should not be treated as exact figures.
Download only the languages you need, remove unused packages after a trip, and leave free space for operating-system updates. If a dictionary streams content instead of storing it locally, a small installation size is not evidence of offline capability.
Final recommendations by reader type
| If you are choosing for… | Pick | Why |
|---|---|---|
| A genuinely free, no-ad English dictionary | WordWeb | Offline definitions and thesaurus content are advertised, and the Android listing says there are no advertisements |
| A mainstream student dictionary | Merriam-Webster | Offline definitions, examples, synonyms, pronunciation, favorites, games, and Word of the Day |
| Premium reference content | Oxford Dictionary & Thesaurus | Premium database access, offline mode, etymology, synonyms, and advanced search tools |
| Pronunciation and vocabulary practice | Merriam-Webster | Real-speaker audio, examples, Word of the Day, games, and saved-word features are advertised |
| Several languages while traveling | Dict Box | Offline dictionary and translation positioning across more than 50 advertised languages |
| A lightweight Android-only dictionary | Livio English Dictionary – Offline | Dedicated local English database with bookmarks and notes |
| Multilingual learning tools | U Dictionary | Offline packages for 44 advertised languages plus synonyms, antonyms, Collins, and WordNet resources |
| A no-risk offline purchase | WordWeb or Merriam-Webster after testing | Both have clearer offline evidence than apps whose current behavior has changed or remains unverified |
For most readers, start with WordWeb if the requirement is free English lookup without ads. Choose Merriam-Webster if pronunciation, examples, and vocabulary practice matter more than avoiding ads. Choose Dict Box for multiple languages, and choose Oxford Dictionary & Thesaurus only if premium offline reference features justify the cost.
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Frequently Asked Questions
Do offline dictionary apps work without internet immediately after installation?
Usually not. Most offline dictionary apps require the English or required language database to be downloaded while connected to Wi-Fi first; optional pronunciation files may require a separate download. Test the app in airplane mode before relying on it.
Which offline dictionary app is completely free and has no ads?
WordWeb is the strongest candidate in this research because its Android listing advertises offline definitions and thesaurus content and says the app has no advertisements. WordWeb is English-focused, and the listing does not prove that every pronunciation or iOS feature is offline.
Is Merriam-Webster available offline for free?
Merriam-Webster’s free app listing advertises offline access to definitions and synonyms, but the free app also has advertising or premium upselling signals. Offline pronunciation should be tested separately because the listing does not establish that every audio feature is stored locally.
Is Oxford Dictionary & Thesaurus offline for free?
The current cited iOS listing places offline mode and unlimited database access among premium features. The app is free to download, but complete offline access should not be described as free.
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What is the best multilingual offline dictionary app?
Dict Box is the strongest verified multilingual option in this comparison because its Android and iOS listings advertise offline dictionary and translation support across more than 50 languages. Download the required language packs first, because web-dictionary tabs and connected translation services may still require internet access.
The Bottom Line
Bottom line: Download WordWeb for the clearest free, no-ad English offline experience; choose Merriam-Webster for pronunciation and learning features; choose Dict Box for multilingual travel; and pay for Oxford Dictionary & Thesaurus only if premium offline reference content is worth the upgrade. Whatever you install, download the database and test definitions, audio, translation, and saved words in airplane mode before leaving connectivity behind.
