Secure Notes vs Notesnook (2026): iOS-Native vs Open-Source E2EE

Quick answer: Notesnook and Secure Notes both ship real zero-knowledge encryption — neither publisher can read your notes. The decision comes down to platforms and ergonomics. Notesnook is the open-source, cross-platform, self-hostable option with a deep three-tier organization model (notebooks → topics → notes). Secure Notes is the iOS-native option with iCloud sync, per-folder passwords, voice notes, and a 12-word recovery seed. If your devices are iPhone and iPad, Secure Notes is the shorter path. If you live across Android, Linux, and Windows, Notesnook is built for you.

Secure Notes vs Notesnook at a glance

How Notesnook handles encryption

Notesnook encrypts notes on-device with XChaCha20-Poly1305, derives keys from your password via Argon2, and ships ciphertext to its sync server. The whole client codebase is open-source on GitHub, which lets you (or anyone) verify the implementation rather than trust marketing copy. Their published architecture documents are unusually detailed for a consumer app, and the project has been independently reviewed.

Two design choices set it apart:

• Three-tier organization.Notebooks contain topics, topics contain notes, and tags cross-cut everything. If you have hundreds of notes, this hierarchy scales better than a flat folder model. If you have thirty, it's overhead.
• Self-hosting.An official self-hosting setup lets you run the sync backend on your own VPS, removing the Notesnook team from the loop entirely. That's a real differentiator for users whose threat model includes “no third-party servers in the path at all.”

Recovery is via a 64-character recovery keyyou save at setup. It works — it's functionally equivalent to a seed phrase in entropy — but it's harder to write down by hand without typos, and most users end up storing it in a password manager, which adds another single point of failure.

How Secure Notes handles encryption

Secure Notes uses AES-256-GCM with keys derived from your master password via PBKDF2 at 100,000 iterations — the standard well-vetted construction for iOS apps. Each note is encrypted on-device before being written to Apple's CloudKit private database. PixelPort LLC, the publisher, has no server-side decryption path. Apple stores opaque bytes.

The ergonomic differences that matter day-to-day:

• iCloud sync, no extra account.You don't create a Notesnook account, set a sync password, or remember another credential. Notes flow between your iPhone and iPad through the iCloud account you already have.
• Per-folder passwords.Notesnook offers a single “vault” for locked notes — one extra password boundary. Secure Notes lets you create any number of locked folders with independent passwords, so credentials and journals don't share the same lock.
• 12-word recovery seed. A BIP-39-style word list you write down once. More forgiving of handwriting and shoebox storage than a 64-character random key.
• Voice notes in the base app. Up to 10 minutes per recording, with transcripts and 0.5×–2× playback. No paid tier required.

The cost: it's iPhone and iPad only. If you write on a Windows machine for work and want the same notes there, Secure Notes is not the right answer — Notesnook is.

Which to use when

Pick Notesnook if: you use Android or Linux or Windows in addition to iOS, you want an open-source client you can audit, you want the option to self-host the sync server, or you have hundreds of notes that benefit from a notebook → topic → tag hierarchy.

Pick Secure Notes if: your devices are iPhone and iPad, you prefer iCloud sync over creating another vendor account, you need per-folder password granularity, you record voice memos and want transcripts, or you want a recovery seed instead of a random key. If you already use Apple Notes for low-sensitivity stuff, Secure Notes slots in cleanly as the vault for the rest.

Many serious users run both. Notesnook on a Linux work machine for drafts that need to leave iOS; Secure Notes on iPhone for credentials, recovery codes, medical records, and journals that never do. Because both are zero-knowledge, neither leaks the other's blast radius.

Final recap

Notesnook is the open-source cross-platform answer with a deep organization model, self-hosting, and a random-key recovery. Secure Notes is the iOS-native iCloud-synced answer with per-folder locks, voice notes, and a seed-phrase recovery. Both implement end-to-end encryption properly. Pick on platforms and recovery philosophy, not on whose math is “better” — they're both correct.

Further reading: the full encrypted note apps comparison or what a truly private notes app actually looks like.

Frequently asked: Secure Notes vs Notesnook