Features

Built for What You
Can't Afford to Lose

From seed phrase validation to inheritance planning — every feature is designed to protect your most sensitive information with zero compromise.

BIP-39 Optimized

Purpose-built for cryptocurrency seed phrases and private keys. seQRets validates BIP-39 mnemonics and checksums automatically — so you know your backup is correct before you split it.

  • Real-time BIP-39 validation — catches typos and transcription errors before you split
  • Supports 12, 15, 18, 21, and 24-word seed phrases
  • SeedQR output for direct hardware-wallet import (Jade, Coldcard, Trezor)
  • Master fingerprint shown beside each SeedQR so you can verify the correct seed loaded into your wallet
  • Validation via @scure/bip39; XFP derivation via @scure/bip32 (both audited)
  • XFP format: 8 uppercase hex chars (e.g., 73C5DA0A), derived from the master public key — no seed exposure
  • Caveat: the on-device XFP will differ if you apply a BIP-39 passphrase at wallet-import time

Secure Any Secret

Not just crypto. Passwords, API keys, legal documents, account credentials, private notes — if it's sensitive, seQRets can encrypt and split it into shares that no single person can read alone.

  • The same encryption used in Signal and WireGuard (XChaCha20-Poly1305 + Argon2id)
  • Optional keyfile adds a second factor — defeats keyloggers and weak passwords
  • Fully offline. No server, no account, no telemetry
  • Clipboard auto-clears 60 seconds after copy
  • XChaCha20-Poly1305 AEAD: 256-bit key, 192-bit random nonce
  • Argon2id KDF: 64 MB memory, 4 iterations, 16-byte random salt (password ‖ keyfile input)
  • Optional keyfile adds up to 256 bits of entropy — concatenated with password before key derivation
  • Installable as a Progressive Web App — service worker caches all assets for true offline use after first load

QR-Coded Shares

Each share becomes a scannable QR code — a Qard. Print them, laminate them, store them in different locations. When you need your secret back, scan enough Qards to meet your threshold.

  • Scannable from any device with a camera
  • Print-friendly format for physical backups
  • Each Qard is useless alone — mathematically guaranteed
  • Durable paper backups outlast digital storage
  • Share format: seQRets|salt|data|sha256:<hex> — 4-part with embedded SHA-256 integrity hash
  • Shamir's Secret Sharing over GF(256) via the shamir-secret-sharing library (Cure53 + Zellic audits)
  • Legacy 3-part shares (no hash) are still fully supported for backward compatibility
  • Manually verifiable in any terminal: echo -n "seQRets|salt|data" | shasum -a 256
Pro · Desktop

Smart Card Support

Store shares on NFC-enabled smart cards for durable, tamper-evident physical security. Tap your card to back up or restore — no cables, no adapters, no friction.

  • NFC tap-to-read and tap-to-write — instant transfers
  • Tamper-evident design reveals physical compromise
  • Survives water, dust, and everyday wear
  • Portable USB card reader included with bundles
  • JCOP-based Java Cards, dual-interface (ISO 7816 contact + ISO 14443 NFC)
  • GlobalPlatform 2.3+ compatible — seQRets applet pre-installed on branded cards
  • Desktop app communicates via standard USB CCID readers (contact mode)
  • PIN-protected with wipe-after-5-attempts; optional wipe protection flag prevents factory reset on lockout

Requires Desktop — see the Shop.

Pro · Desktop

Inheritance Planning

Document every secret, assign assets to beneficiaries, and plan for incapacitation — all in one encrypted plan.

  • Multiple Secret Sets — capture every secret in one plan
  • Beneficiaries and emergency contacts — who gets what, and what happens if you're incapacitated
  • Edit, re-encrypt, or export a printable PDF for heirs
  • Automatic review reminders so your plan never goes stale
  • Plan schema v5 with backward-compatible migration — older plans auto-upgrade on decryption
  • Review reminders use a local sidecar file storing only a future date — zero plan contents, zero identifiers
  • Reminder cadence: 6, 12, or 24 months; home-tab banner + nav badge + optional OS notification
  • PDF export uses dynamic section numbering — empty sections are skipped, no gaps

Requires Desktop — see the Shop.

Bob — AI Assistant

Meet Bob, your built-in security guide. Bob helps you understand encryption concepts, plan your secret management strategy, and make informed decisions — without ever seeing your secrets.

  • Explains security concepts in plain language
  • Suggests share distribution and threshold strategies
  • Helps plan inheritance and recovery scenarios
  • Optional — bring your own Google Gemini key, disconnect anytime
  • Your questions are sent directly to Google's Gemini API — no middleman, no seQRets server
  • Desktop: API key stored in the OS keychain (macOS Keychain / Windows Credential Store)
  • Web: key stored in localStorage with an optional "Remember this key" toggle — unchecked = session-only
  • No secret data, share data, or plan contents are ever included in any request

Desktop App

Ready to Go Pro?

Everything in the free web app, plus smart card integration, an in-app inheritance plan builder, code signing, and automatic updates — built natively with Rust and Tauri.

seQRets Desktop — Dark Theme
seQRets Desktop — Light Theme
Code-signed binary — installs cleanly on Mac, Windows & Linux
Automatic delta updates — security patches delivered instantly
NFC smart card support — tap to back up or restore
Everything included — smart card & USB reader shipped to you

One-time purchase. No subscription. Yours forever.

A code-signed desktop app with automatic updates, NFC smart card support, and a portable USB reader — all included. The source code is always free under AGPLv3.

Build from Source