n of m Shamir's Secret Sharing
Split & Recover Seed Phrases
$2.99 · Designed for iPad. Not verified for macOS.
Split your Ethereum seed phrase into secure shares with Shamir's Secret Sharing. Print QR code cards, distribute them, and recover your wallet offline. No servers. Ever.
n of m splits your Ethereum seed phrase into distributed shares using Shamir's Secret Sharing — a cryptographic method where any n shares out of m total can reconstruct your secret, but fewer than n reveal nothing. Generate a BIP39 mnemonic, choose your threshold (e.g., 3-of-5), and export printable QR code cards. Store cards in separate secure locations. When you need your wallet back, scan enough cards and the app reconstructs your seed phrase on-device.
No servers. No network calls. No analytics. No telemetry. Everything happens on your device.
GENERATE SEED PHRASES
• Create 12, 15, 18, 21, or 24-word BIP39 mnemonics
• Three entropy sources: system cryptographic RNG, device accelerometer motion, or both combined
• Import and validate existing seed phrases with BIP39 checksum verification
SPLIT INTO SHARES
• Configure any threshold: need n shares out of m total (up to 10 shares)
• Information-theoretic security — fewer than n shares reveal zero information
• Optional PIN encryption before splitting (SHA-256 key derivation)
• Optional BIP39 passphrase for separate derivation trees
PRINTABLE QR CODE CARDS
• Export each share as a full-page PDF card
• Clear labels: share number, threshold, creation date, instructions
• Derived Ethereum address printed for verification
• Distribute via system share sheet or save to device
SCAN AND RECOVER
• Camera-based QR scanner with real-time validation
• Automatic duplicate detection and secret ID matching
• Progress indicator shows how many shares remain
• PIN and passphrase prompts when configured
• Recovered mnemonic displayed with derived addresses
ENCRYPTED VAULT
• On-device storage backed by iOS Keychain and Secure Enclave
• Per-secret locking — independently lock each entry
• View and copy Ethereum addresses, reveal private keys
• Re-derive addresses or re-export PDF cards anytime
• Editable names, metadata, and notes
HD WALLET DERIVATION
• MetaMask path (m/44'/60'/0'/0/i)
• Ledger Live path (m/44'/60'/i'/0/0)
• Custom BIP32/BIP44 paths for advanced users
• Derive multiple addresses from a single mnemonic
SECURITY
• Fully offline — zero network requests of any kind
• FaceID and TouchID authentication for vault access
• Optional 4-8 digit PIN with 10,000-round SHA-256 key derivation
• BIP39 passphrase support for hidden wallet trees
• Shamir's Secret Sharing over GF(256) provides unconditional security
LEARN
• Visual guide explaining Shamir's Secret Sharing
• Mathematics deep-dive: polynomial construction, Lagrange interpolation, finite field arithmetic
• Walkthrough of threshold concepts and distribution strategies
Built for cryptocurrency holders who take self-custody seriously. Whether you manage a personal Ethereum wallet or implement geographic redundancy for cold storage, n of m gives you cryptographic splitting without trusting anyone else with your keys.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Mark Phillips, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Mark Phillips
- Size
- 59.3 MB
- Category
- Finance
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Mark Phillips
