DEF-ISL
DEF-ISL: A free, extensive ISL reference app, but without documented progression or search tools. Ranked #28 of 34 in Sign Language Apps by our editors (5.3/10); pricing: Free plan; best for learners seeking a large free ISL sign collection.
At a glance
- Editor score5.3 / 10
- PricingFree plan
- Best forLearners seeking a large free ISL sign collection
- Free planYes
- Paid fromFree
- Signed languagesIndian Sign Language (ISL)
- Facts checked23 Sep 2026
Where it wins
- More than 50,000 Indian Sign Language signs and phrases
- Built-in videos paired with sign-language content
- Illustrations support children and adult learners
Where it doesn't
- No documented learner-progress tracking
- No documented dictionary-search function
- Offline use is not documented
Our verdict on DEF-ISL
DEF-ISL is a free mobile app for learning Indian Sign Language (ISL), available on iOS and Android. Deaf Enabled Foundation describes it for children and adults, including people who are deaf or partially deaf and others interested in learning ISL. Its mixed lesson format combines signs and phrases with built-in videos and accompanying illustrations, making it suitable for individual learners who want broad visual reference material on a phone.
The app’s main strength is collection size: the published description says it contains more than 50,000 signs and phrases. Videos provide demonstrations, while illustrations add a static visual aid for reviewing content. The App Store lists DEF-ISL as free, and the product has no paid tier described. That combination makes it a practical starting point for learners who want access to a large ISL library without a subscription or other stated cost. Its mobile-only deployment also keeps the resource focused on iOS and Android use.
DEF-ISL is less suited to learners who need a structured course system or tools for measuring progress. The product positioning identifies gaps in verified progression, dictionary search and broader learning tools, and the published description does not document offline use. Choose it for breadth, visual demonstrations and free access to ISL content; consider another app if guided sequencing, searchable reference workflows or progress tracking are central to your learning plan.
Your product? Our editors can test DEF-ISL in depth and publish a review, labelled as paid · from $149/mo →
DEF-ISL pricing
DEF-ISL fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Signed languages | Indian Sign Language (ISL) |
| Lesson format | Mixed |
| Offline access | Not verified |
| Dictionary lookup | Not verified |
| Progress tracking | Not verified |
| Supported platforms | iOS, Android |
| Deployment | Mobile |
| Platforms | iOS, Android |
| Built for | Solo (editorial estimate) |
| Pricing | Free plan |
| Website | def.org.in |
| Facts checked | 23 Sep 2026 |
Alternatives to DEF-ISL
- BSL SignBankA rich, free BSL reference with video search, regional detail and quizzes.9.2
- HandSpeakA broad ASL reference library with free access and optional Patron features.8.8
- SpreadTheSignA free-to-start video dictionary for comparing 23 sign languages.8.6
See all DEF-ISL alternatives →
Used DEF-ISL? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used DEF-ISL for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
DEF-ISL is listed in our Sign Language Apps directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/def-isl/"><img src="https://www.itechguides.com/best/badge/def-isl.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update