Passwords, API keys, .p8 certificates and .env files, encrypted on your device with Argon2id and AES-256-GCM. Our servers only ever hold ciphertext.

Try It FreeSee pricing

What leaves your device is already unreadable.

Every item is encrypted before it syncs. This is the path a single API key takes.

How the security works
  1. Your device

    A key from your master password

    Argon2id derives it in memory, on this device. Your master password is never sent anywhere.

  2. Your device

    Sealed with AES-256-GCM

    Each item gets authenticated encryption. Any tampering with the ciphertext is detected and rejected.

  3. Our server

    Stored as an opaque blob

    Sync only ever receives ciphertext. Neither we nor anyone who breaches us can read it.

Built for the secrets other managers ignore.

Authsidian also protects what isn’t a password: API keys, certificates and the files that pile up in your Downloads folder.

Watches your Downloads folder in the background and catches .p8, .pem, certificates or .env files before they leak. One click encrypts them into your vault and shreds the original.

Head to head with the big names.

Other managers are great at storing passwords. Authsidian also guards the secrets that aren’t.

← Scroll to see full comparison →
Feature comparison of Authsidian, 1Password, Bitwarden and Apple Keychain
FeatureAuthsidian1PasswordBitwardenApple Keychain
Client-side zero-knowledgeYesYesYesYes
Auto-detects .p8, .pem and .env filesYesNoNoNo
Password-protected, self-destructing sharingYesPartialOne-time view linksYesNo
Autofill on Stripe, Shopify, MercadoPago and PayPalYesYesPartialLimited in iframesPartialSafari only
Native Windows Hello and system trayYesYesYesNo
Unlimited multi-device syncYesYesYesPartialApple-centric
Zero telemetry in client apps (desktop, mobile, extensions)YesPartialAnalytics collectedPartialCrash telemetryPartialDevice telemetry

Based on each product’s public documentation as of October 2026. Third-party features may change.

Free on your device. Pro when you want the cloud.

The local vault is free and unlimited, with no account. Pro adds sync and encrypted storage from $2.42 a month, billed yearly.

See pricing

  • Windows

    Windows 10 and 11 · .exe installer

    x64 (.exe)ARM64· Coming soonMSI

  • macOS

    Universal .dmg, Apple Silicon and Intel

    Download .dmgIntel (.dmg)· Coming soon

  • iPhone

    iOS with Face ID and autofill

    App Store· Coming soonTestFlight

  • Browsers

    Extension with card autofill

    Chrome· Coming soonEdge· Coming soon