Zero-knowledge notes even TaskNote cannot read
Zero-knowledge notes letting you write and store private content with encryption that is mathematically impossible for TaskNote - or anyone else - to read without your key.
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Your key, never our server
In a zero-knowledge system, the service never holds your decryption key. TaskNote derives your key from your password on your device using PBKDF2. The key is used locally to encrypt notes with AES-256-GCM. The server receives only ciphertext.
- Key derived from password on-device, never transmitted
- AES-256-GCM encryption on every note
- Server stores only unreadable ciphertext
- Mathematically impossible for TaskNote to read notes
Breach-proof, because we hold nothing readable
If TaskNote were breached, the attacker would find only encrypted blobs. There are no plaintext notes to steal. Zero-knowledge means a server compromise exposes nothing about your content - only the person with your key can decrypt your notes.
- No plaintext notes on servers
- Server breach exposes only ciphertext
- Same security model as Signal and 1Password
- No master key held by TaskNote
Zero-knowledge sync across all devices
Your notes sync across iPhone, Android, Mac, Windows, and any browser while staying encrypted the entire journey. Decryption happens only on your device. The sync server is a secure relay that never sees plaintext.
- Encrypted sync across all platforms
- Decrypted only on your device
- Works offline - no sync needed to read notes
- One account, all devices, always encrypted
Free, privacy is not a paid feature
Some apps charge for encryption or lock private notes behind a premium tier. TaskNote includes zero-knowledge encryption on the free plan for every user. Notes, kanban board, and reminders are all encrypted and all free.
- Zero-knowledge encryption on free plan
- Kanban board and reminders also free
- No credit card needed
- No feature wall between you and privacy
Questions about zero-knowledge encryption
What does zero-knowledge mean in a notes app?
Zero-knowledge means the service provider - in this case TaskNote - has no ability to read your data. Your notes are encrypted on your device with a key only you hold. The server stores only ciphertext it cannot decrypt.
How is zero-knowledge different from regular encryption?
Regular encryption protects data in transit. Zero-knowledge goes further - even the company hosting your data cannot read it, because the encryption key never leaves your device. Not even a court order could force TaskNote to hand over readable notes.
What encryption does TaskNote use?
TaskNote uses AES-256-GCM with keys derived via PBKDF2. These are the same standards used by security-focused products like Signal and 1Password.
Is zero-knowledge notes free?
Yes. Zero-knowledge encryption is on the free plan by default. No upgrade needed to protect your notes. Notes, kanban board, and reminders are all free.
What if I lose my password?
You get a recovery key at setup. If you lose both your password and recovery key, encrypted notes cannot be recovered - not even by TaskNote. This is the nature of zero-knowledge: complete privacy requires you to hold your key.
Does zero-knowledge work across devices?
Yes. Notes sync across all devices while remaining encrypted the entire time. The decryption happens only on your device when you open the app.
Start with zero-knowledge notes - free forever
Notes only you can read. AES-256-GCM encryption, no key on the server, free plan.
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