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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →There is no single best notes app for everyone. Standard Notes and Notesnook are the strongest candidates here if you want a dedicated app with end-to-end encryption on by default. Apple Notes is a reasonable option for Apple users who explicitly lock individual sensitive notes and can work within its passphrase, attachment, and sharing limits. Choose based on what you need protected, how you use your devices, and whether you can safely retain the credentials needed to recover your notes.
What “secure notes” should protect
Encryption at rest, end-to-end encryption, an app lock, and biometric unlock are not interchangeable. Encryption at rest protects stored data from some forms of access to the storage medium. End-to-end encryption is designed so note contents are encrypted on your device and remain unreadable to the service provider. An app lock can make casual access harder on a device, but does not necessarily add cryptographic protection to stored data.
Before choosing, check whether encryption covers note content, attachments, and metadata; whether it is automatic or must be enabled for each note; what happens when a device is unlocked; and whether the provider can restore access if you lose a password or passphrase. Also consider your threat model: protecting against someone who briefly handles your unlocked phone is different from minimizing what a cloud provider can read.
How the leading options compare
| App | Encryption and scope | Local access and platforms | Important limits |
|---|---|---|---|
| Standard Notes | Vendor says notes, tags, and other app-generated data are encrypted with XChaCha20-Poly1305, with keys derived from the account password using Argon2. Encryption and decryption happen on the device. | Available across platforms; a local application passcode can protect account keys and the device database. Vendor documentation recommends a passcode for web use. | Without an application passcode, account keys in the web app are stored unencrypted in its app database. Vendor says it has completed third-party audits, but their scope and covered versions have not been independently assessed here. |
| Notesnook | Vendor says end-to-end encryption is enabled by default and web notes are encrypted in the browser before syncing. | Windows, macOS, Linux, Android, iOS, and web; notes can be edited offline and synced when connectivity returns. | A separate-password vault and app lock are available as additional options; the App Store listing identifies them as Pro features. Independent audit reports were not assessed here. |
| Apple Notes secure notes | Only notes the user locks receive the documented secure-notes protection. Apple says those notes and supported attachments are end-to-end encrypted using a user-provided passphrase. | Locking is supported on iPhone, iPad, Mac, Apple Vision Pro, and iCloud web, using a device passcode or separate password. | Only specified attachment types are supported; resetting the passphrase does not unlock previously secured notes. Shared notes that are not passphrase-encrypted have unencrypted metadata such as creation and modification dates. |
Standard Notes: a strong fit for automatic encryption
Standard Notes says it encrypts notes, tags, and other data generated by its apps with XChaCha20-Poly1305. According to its documentation, account-password-derived keys use Argon2, encryption and decryption occur offline on the device, and encrypted data syncs over an encrypted connection. The company also says data is signed so its signature can be checked during decryption. These are vendor descriptions of its design, not a comparative security audit. Standard Notes says it has open-source code and completed third-party audits; audit reports and the coverage of current client versions have not been assessed here. Standard Notes security documentation
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Protect the local app as well
End-to-end encryption for synced data does not by itself prevent someone using an already-unlocked device or browser session from reading notes. Standard Notes says its local application passcode can protect account keys and the device database, and that passcode keys are ephemeral rather than saved to disk. Its documentation characterizes mobile biometrics as a local-access deterrent, not additional cryptographic protection. For the web app, Standard Notes warns that account keys are stored unencrypted in the app database if you do not use an application passcode, and recommends setting one. Standard Notes device-encryption documentation
Notesnook: a cross-platform option with encryption on by default
Notesnook says its free plan includes unlimited notes and devices with end-to-end encryption enabled by default. It lists apps for Windows, macOS, Linux, Android, iOS, and web; it says web notes are encrypted in the browser before syncing. The vendor also says notes remain readable and editable offline and sync when connectivity returns. These are product claims, not independently verified audit findings. Notesnook downloads and product documentation
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Notesnook documents device app lock, a vault protected by a second password, and account two-factor authentication. These features address different risks: two-factor authentication helps protect account sign-in, while a separate vault and local app lock add access controls. The App Store listing describes app lock and encrypted vault as Pro features, so confirm current plan entitlements for your platform and region before relying on them. Notesnook App Store listing
Apple Notes: secure only the notes you lock
Apple’s secure-notes feature is not an automatic encryption setting for every note. You must lock a note and authenticate with the device passcode or a separate password. Apple says secure notes use a user-provided passphrase for end-to-end encryption. Its security guide describes a 16-byte key derived from the passphrase using PBKDF2 and SHA-256, with the note and supported attachments encrypted using AES-GCM. Supported attachment types include images, sketches, tables, maps, and websites; other attachment types cannot be encrypted in secure notes. Apple says the original unencrypted data is deleted after encrypted records are created. Apple Platform Security: Secure features in the Notes app
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Know the passphrase and session behavior
Apple says resetting the secure-notes passphrase lets you create new secure notes but does not reveal notes secured with the old one; the original passphrase remains necessary for those notes. After successful authentication, a secure-notes session stays open until you lock it, the device locks, or the app remains in the background longer than Apple’s documented timeout: more than three minutes on iPhone, iPad, and Vision Pro, or more than eight minutes on Mac.
Sharing does not have the same protection
For shared notes that are not passphrase-encrypted, Apple says the content uses CloudKit’s encrypted data type, but metadata such as creation and modification dates is not encrypted. Do not assume that sharing a note gives it the same protection as locking it with a passphrase.
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Which app fits your situation?
- Choose Standard Notes if you want a dedicated notes app whose vendor says encryption is applied by default, and you are prepared to set a local application passcode—especially for web use. Its published audit claims may matter to you, but check the audit scope and which app versions were covered.
- Choose Notesnook if you need Linux or broad desktop and mobile availability, offline editing, and default end-to-end encryption according to the vendor. Confirm which local-lock and vault features are included in the plan you intend to use.
- Choose Apple Notes secure notes if you already work in Apple’s ecosystem, need to secure selected notes rather than all notes, and can retain the passphrase required for older locked notes. Check attachment support before moving sensitive files into a note.
Set up sensitive notes without creating a recovery problem
- Decide what you are protecting. Identify whether your concern is cloud-provider access, someone using your unlocked device, account takeover, accidental sharing, or loss of access. One feature rarely addresses all of these.
- Enable the relevant protection before adding secrets. In Apple Notes, lock each sensitive note. In Standard Notes, set an application passcode, including for web use. In Notesnook, review the app lock and vault options available on your plan.
- Keep credentials recoverable to you. Store account passwords and any separate secure-notes passphrase somewhere protected and independent of the notes they unlock. Apple’s documentation is explicit that resetting a passphrase will not recover older locked notes.
- Check attachments and sharing separately. Confirm that your attachment type is covered, and do not assume a shared note has the same encryption or metadata behavior as a private, locked note.
- Plan a safe migration. Before moving important information, check the app’s current export and backup options and verify that you can access a copy. Export and recovery workflows are not established comparably for these products here, so do not delete the original records until you have confirmed your own backup.
How much confidence should you place in security claims?
Product documentation can explain a design, but a vendor’s claim is not the same as an independent review of the current apps. Open-source availability, a published cryptographic design, and a completed audit are useful but distinct forms of evidence. For an audit, look for its date, scope, covered clients and versions, and whether identified issues were resolved. The available documentation does not establish that one of these apps is safest for every threat model, and no hands-on comparison of current builds is available here.
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