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Do not move sensitive notes into an app merely because its source code is public. Before trusting an open-source notes app, verify its encryption scope and defaults, test the recovery process, protect every device that can display a note, inspect export and backup options, and compare the project’s code and audit evidence with your threat model. Open source makes inspection possible; it does not prove that the installed build is secure, audited, or configured safely.
Start by defining what “private” means to you
A notes app can protect one threat while doing little against another. Write down the consequences you are trying to avoid before comparing features. This prevents a familiar label such as “end-to-end encrypted” from becoming a substitute for a security decision.
| Threat | Question to ask | Control to verify |
|---|---|---|
| Cloud provider or sync operator reading notes | Are notes encrypted on the device before upload, and can the provider decrypt them? | End-to-end encryption (E2EE) with documented key handling |
| Someone holding an unlocked phone or computer | Can an open session display notes without another check? | Screen lock, full-device encryption, app lock, session timeout and account separation |
| Account takeover | Can an attacker sign in and obtain keys or create a new trusted session? | Two-factor authentication, session revocation and a documented recovery process |
| Lost or stolen device | Can local files, caches or backups be read offline? | Full-device encryption, strong device credentials and encrypted local backups |
| Malicious or compromised update | Can you identify what code you installed and how releases are controlled? | Reproducible or well-documented releases, signed distribution where available, and reviewable source |
| Accidental deletion or forgotten credentials | Can you restore notes without weakening encryption? | Tested exports, backups and a recovery key or password stored safely offline |
The reviewed guidance does not establish that one app protects equally against all of these situations. Choose the app and configuration that address the threats that matter to you, then document the remaining exposure.
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It enables inspection
Public client code lets researchers, maintainers and users inspect how data is stored, encrypted and synchronized. Privacy Guides treats open-source clients as a minimum criterion for notebook recommendations. This is valuable because a claim can be compared with implementation rather than accepted solely on marketing language.
#1 Best Overall
- FIPS 197 with XTS-AES 256-bit Encryption: Provides business-grade security with hardware-based encryption to protect your sensitive data
- Brute Force and BadUSB Attack Protection: Safeguards against unauthorized access attempts and malicious USB attacks with digitally-signed firmware
- Multi-Password Option with Complex/Passphrase modes: Offers flexible password configuration options to meet various security requirements and user preferences
- New Passphrase Mode: Enhanced security feature allowing users to create longer, more memorable password phrases for easier access without compromising protection
- Dual Read-Only (Write-Protect) Settings: Enables write protection functionality to prevent accidental data modification or deletion when needed
It is not an automatic security certificate
Publishing a repository does not prove that the binary in an app store was built from that repository, that every component is open, or that anyone has reviewed the relevant code. Check that the repository identifies the same application, package and release version you intend to install. Look for release notes, dependency updates, vulnerability handling and a clear process for publishing fixes. A dormant repository, an unexplained gap between source and distribution, or a client that depends on opaque services deserves extra caution.
Separate audit evidence from a vendor statement
An independent audit should identify the auditor, scope, dates, version examined, findings and remediation status. A security page for Standard Notes says the product has completed audits by Trail of Bits and Cure53; that is a vendor statement until you locate the underlying reports and confirm that they cover the current code and features. An audit is a point-in-time examination, not proof that future releases or your configuration are safe.
Verify the encryption scope, not just the acronym
Ask where encryption occurs
For protection from a sync provider, encryption must occur on a trusted device before data leaves it. Determine whether keys are generated and retained under your control, or whether a service can reset them. Ask what happens when you add a new device and whether that device receives keys through an authenticated process.
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List every object that needs protection
“Notes are encrypted” can leave important data uncovered. Check whether the design includes note text, notebooks or folders, tags, attachments, images, resource files, titles, timestamps, sharing information and other metadata. Joplin’s documentation says its E2EE covers notes, notebooks, tags and resources. Notesnook’s help page describes encrypting each database item before synchronization, while explicitly presenting the explanation as an overview rather than a formal specification. Treat those descriptions as scope statements to verify, not as a substitute for an independent assessment.
Identify what remains visible
Even with E2EE, a service may see account identifiers, traffic timing, device information, file sizes or other operational metadata. The provider may also know that an account exists and which synchronization endpoint it uses. If your threat model includes metadata analysis, ask for a precise list of server-visible fields and whether search, sharing or previews require server-side processing.
| Check | Evidence you want | Warning sign |
|---|---|---|
| Content coverage | Documentation naming notes and attached resources, not only “data” | Unqualified encryption slogan |
| Key ownership | Clear explanation of key generation, storage and device enrollment | Support can reset an encryption key without your recovery material |
| Metadata | Statement of what the server can see | No discussion of titles, sizes, timestamps or account data |
| Defaults | Whether E2EE is enabled at first launch and on every sync target | Encryption hidden behind an optional setting |
Check the real configuration on every device
Joplin’s setup illustrates why defaults matter
Joplin is open source and offline-first, but its E2EE is configuration-sensitive. The documented sequence is:
- On one device, open the synchronization or encryption settings and enable E2EE.
- Create the master-key password and record it in a secure offline location. Joplin warns: “Make sure you do not forget it since, for security reason, it cannot be recovered.”
- Complete the initial encrypted synchronization from that device.
- Only after that process is complete, configure and synchronize the next device.
- Repeat the process one device at a time, confirming that each client has received and can use the encryption keys.
Joplin’s guide warns against enabling encryption on multiple devices in parallel. Follow the exact sequence for the clients you actually use rather than assuming that a desktop setting automatically changed a phone or tablet.
Look for an explicit “enabled” state
After setup, create a harmless test note containing an attachment, synchronize it, and inspect the status on each device. Confirm that a newly added sync target does not silently operate without E2EE. If a client offers separate settings for local storage, synchronization and backups, treat them as separate controls and verify each one.
Rank #2
- Certified to FIPS 197 - High-level information security standard approved by the U.S. Government
- Brute-Force Password Attack Protection - Data is automatically erased after 6 failed access attempts. The data and encryption key are securely destroyed and the crypto drive is reset
- Rugged Double-Layer Waterproof* Design - Protects the crypto drive against knocks, drops, break-in and submerging in water. The electronics are shielded by a hardended inner case. The rubberised silicone outer casing provides a final layer of protection
- Auto-lock - The crypto drive will automatically encrypt all data and lock when removed from a PC/Mac or when the screen saver or "computer lock" function is activated on the host PC/Mac
- Secure Entry - Data cannot be accessed without the correct high-strength alphanumeric 8-16 character password. A password hint option is available. The password hint cannot match the password
Protect a device that is already unlocked
E2EE protects data while it is being synchronized or stored on a server. It does not protect a note that an authorized client has already decrypted for display. Privacy Guides specifically notes that Joplin lacks an application or individual-note password or PIN, while noting mobile biometric app-lock support. This distinction matters when another person can pick up an unlocked device or when a session remains open.
- Use a strong operating-system passcode rather than a short, guessable code.
- Keep full-device encryption enabled and apply security updates promptly.
- Enable the app’s lock or biometric gate where available, then test how long an unlocked session remains valid.
- Set a short screen-lock and session timeout, especially on shared or portable computers.
- Review notification previews, recent-app thumbnails, clipboard history and local search indexing for accidental disclosure.
- Remove old devices and browser sessions from the account when they are retired or lost.
A server’s inability to decrypt synchronized notes cannot help if someone can open the client, read its cache or copy an exported file from the device.
Test recovery before importing irreplaceable notes
Understand the failure mode
Strong encryption intentionally limits support options. Joplin states that its E2EE master-key password cannot be recovered. Notesnook says that losing both the account password and recovery key makes the data unrecoverable. These are not minor terms-of-service details: they determine whether a forgotten credential becomes permanent data loss.
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- Create a test notebook containing text, an image and an attachment.
- Synchronize it to the chosen target.
- Export or back it up using the app’s documented method.
- On a separate device or clean profile, restore the copy with the recovery material.
- Open every item and confirm that formatting, links, attachments and timestamps survived.
- Record which password, key or device authorization was required.
Store recovery material offline in a location protected from theft, fire and casual access. Do not keep the only copy inside the encrypted notebook that it is supposed to recover. Re-test after a major app, operating-system or synchronization change.
Check exports, offline access and backup protection
Prefer a standard, usable export
Privacy Guides’ notebook criteria call for export to a standard format. Joplin describes its notes as Markdown and says data remains available locally for offline use. A standard export reduces the risk that a service shutdown, account lockout or incompatible client traps your writing.
Inspect the export itself, not just the menu label. Determine whether it includes attachments, embedded images, notebooks, tags, links, metadata and encryption settings. Open a sample outside the app and verify that another tool can read it.
Distinguish offline availability from offline confidentiality
Offline-first access means the client can show local data without a network connection; it does not automatically mean the local database or its attachments are encrypted against someone who can access the profile. Check where files are stored, whether the operating system encrypts them, and whether the app locks or clears its local cache.
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Protect backups as carefully as live notes
Privacy Guides describes encrypted local backup or synchronization as a best-case feature. If the app produces an unencrypted archive, anyone who obtains that file can bypass the app’s login and E2EE. Encrypt backup media independently, restrict permissions, maintain more than one copy, and periodically perform a clean restore.
Rank #3
- Certified to FIPS 197 - High-level information security standard approved by the U.S. Government
- Brute-Force Password Attack Protection - Data is automatically erased after 6 failed access attempts. The data and encryption key are securely destroyed and the crypto drive is reset
- Auto-lock - The crypto drive will automatically encrypt all data and lock when removed from a PC/Mac or when the screen saver or "computer lock" function is activated on the host PC/Mac
- Secure Entry - Data cannot be accessed without the correct high-strength alphanumeric 8-16 character password. A password hint option is available. The password hint cannot match the password
- SuperSpeed USB 3.0 - Transfer all your confidential files and folders faster than ever before. Works on both PC & Mac
Evaluate account and synchronization controls
Two-factor authentication and sessions
Check whether the service supports a standards-based authenticator code (TOTP), hardware security keys or another second factor. Confirm how to revoke active sessions and whether a lost phone can be removed without access to that phone. Standard Notes’ security page describes optional TOTP two-factor authentication and session revocation; verify the current behavior in the product’s own settings before relying on it.
Recovery can change the security model
Some services let support or an account-recovery flow restore access. Ask whether that process restores only account access or also decrypts note content. If a reset can produce readable notes without your encryption secret, the design may not provide the provider-blind protection you expect.
Choose synchronization deliberately
Joplin supports several synchronization targets and can be used offline. Compare providers for jurisdiction, retention, access logging and account controls, but do not assume that selecting a different target changes the app’s encryption scope. Verify that every target you use receives ciphertext rather than a plaintext database or unencrypted attachment.
Compare candidates on the same evidence
Use one worksheet for every app so an appealing feature in one product does not distract from a missing control in another.
| Criterion | What to record |
|---|---|
| Encryption and defaults | On-device encryption, covered objects, server-visible metadata, and whether E2EE is optional |
| Local-device protection | App or note lock, biometric behavior, cache handling and session timeout |
| Keys and recovery | Who holds keys, what can be reset, recovery-key requirements and documented irrecoverable cases |
| Sync choices | Whether sync is optional, supported targets and device-enrollment sequence |
| Offline use | What remains available without a network and how the local database is protected |
| Portability | Standard export format, attachment handling and whether exports can be read independently |
| Backups | Encrypted local backup, restore procedure and permission controls |
| Code transparency | Open client and server components, repository-to-build correspondence and release history |
| Audit evidence | Public report, auditor, scope, date, version and unresolved findings |
| Account security | 2FA methods, session revocation, recovery effects on decryption and breach notifications |
Joplin is a useful example of an app that combines open source and offline-first operation with user-controlled, separately enabled E2EE. Notesnook’s documentation explains its pre-sync encryption and the consequences of losing credentials, while cautioning that the page is not a formal specification. Standard Notes’ security page describes on-device encryption, open source code, audits, TOTP 2FA and app lock as product claims that require current verification. Privacy Guides’ independent criteria add the useful baseline of open-source clients, E2EE cloud synchronization, standard-format export and, ideally, encrypted local backup.
Use this pre-migration checklist
- Write down the threats and notes that require protection.
- Confirm the repository, release and installed package refer to the same application.
- Read the encryption documentation and list protected content, attachments and metadata.
- Enable E2EE on one device, complete synchronization, then enroll additional devices in sequence.
- Turn on device encryption, a strong screen lock and any available app lock.
- Enable two-factor authentication and learn how to revoke sessions.
- Save the encryption password or recovery key offline; verify whether it is recoverable.
- Export a small sample, inspect it outside the app and restore it on a clean device.
- Configure encrypted backups and test a restore before importing sensitive material.
- Review the setup again after major updates, device replacement or a change of synchronization target.
Can an independently encrypted external drive help?
An encrypted USB drive or external SSD can hold an offline export when you need a copy outside the app’s account and synchronization system. It does not replace E2EE, device security or a tested restore procedure. Keep the drive encrypted, protect its unlocking credential separately, store it away from the primary device and periodically verify that the export can still be opened.
The practical standard for trust
Trust should come from several verified controls working together: inspectable code tied to the installed release, encryption that covers the data you actually create, deliberate configuration on every client, protection for unlocked devices, recovery material you can preserve, portable exports and backups you have restored, and account controls that limit unauthorized sessions. If any one of those remains unknown, treat the notes as exposed to that specific risk rather than assuming the open-source label fills the gap.
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