for iOS
Shamir's Secret Sharing with native camera performance
$2.99 -- full functionality, no in-app purchases.
A free version (2-of-3 only) is coming soon. Price will increase to $9.99-$19.99.
Laptop webcams were not designed for QR code scanning.
Everything the web app does, plus native iOS capabilities.
AVFoundation-powered QR detection. Point and scan -- no fumbling with webcam positioning or browser permissions.
Lock your vault with biometric authentication. iOS Keychain encryption keeps secrets safe even if the device is compromised.
Create new BIP39 seed phrases (12 or 24 words) with cryptographic entropy, or import existing mnemonics from any wallet.
Split into up to 10 shares with configurable thresholds. GF(2^8) finite field arithmetic -- information-theoretic security.
Export as full-page PDF cards with QR codes, metadata labels, instructions, and a notes section. Print and distribute.
Store recovered secrets in an on-device encrypted vault. AES-256-GCM encryption with optional PIN protection.
Derive addresses using MetaMask, Ledger Live, or custom BIP32/BIP44 paths. Verify your seed maps to the right addresses.
Zero network calls. No telemetry, no analytics, no servers. Every operation runs entirely on your device.
Four steps from seed phrase to distributed cold storage.
Create a new BIP39 seed phrase with device entropy (accelerometer + system CSPRNG), or import an existing 12/24-word mnemonic. Optionally derive HD wallet addresses to verify correctness.
Choose your threshold (N) and total shares (M). The app constructs random polynomials over GF(2^8) and evaluates them to produce M share points. Each share is encoded as a QR code on a printable card.
Export share cards as PDF. Each card includes the QR-encoded share, share index, threshold requirement, and a notes section. Print on standard paper and store each card in a separate secure location.
When you need your seed phrase, scan any N share cards with the iPhone camera. The app performs Lagrange interpolation over GF(2^8) to reconstruct the original secret. Store the result in the encrypted vault.
Defense in depth at every layer.
All cryptographic operations execute locally. No server communication, no cloud sync, no third-party dependencies at runtime.
Shamir's scheme guarantees that fewer than N shares reveal zero bits of information about the secret. This holds against unlimited computing power.
Vault data is encrypted via the iOS Keychain -- hardware-backed encryption tied to the device's Secure Enclave.
Vault access requires FaceID or TouchID. Failed biometric attempts fall back to device passcode, never to a weaker mechanism.
The full source code is publicly auditable. No obfuscation, no binary blobs, no hidden network calls. Verify the implementation yourself.
Sensitive data (seed phrases, shares, private keys) is cleared from memory after use. The app never writes plaintext secrets to disk.
Split your first seed phrase in under a minute.