Shamir Backup

Shamir Backup splits your cryptocurrency seed phrase into multiple shares so that no single share reveals your secret. Only a minimum number of shares (threshold) is needed to recover the original phrase. HOW IT WORKS Shamir's Secret Sharing is a proven cryptographic scheme used by security professionals worldwide. You choose how many shares to create (e.g. 5) and how many are needed to recover (e.g. 3). Any combination of 3 shares will restore your seed phrase — but 2 or fewer reveal absolutely nothing. SPLIT • Enter your seed phrase • Choose total shares (2–16) and recovery threshold • Generate shares instantly • Select, copy, or share individual shares via AirDrop, Messages, or any sharing method RECOVER • Paste the required number of shares • Instantly reconstruct your original seed phrase • Copy the recovered phrase with one tap SECURITY FIRST • 100% offline — no internet connection, no servers, no cloud • No third-party libraries — cryptography implemented from scratch • Sensitive data is automatically cleared when you leave the app • Clipboard is cleared on app termination • No analytics, no tracking, no data collection PAID ONCE, YOURS FOREVER • No subscriptions, no in-app purchases, no trial limits • All features available immediately • No ads, ever WORKS EVERYWHERE • iPhone, iPad, and Mac (Apple Silicon) • Adaptive interface — tabs on iPhone, two-column layout on iPad and Mac • Full Dark Mode support BUILT ON PROVEN MATH • Galois Field GF(256) arithmetic with AES polynomial • Lagrange interpolation for share reconstruction • Industry-standard scheme used by hardware wallets and exchanges Perfect for cryptocurrency holders who want to distribute their seed phrase backup across multiple secure locations — a safe deposit box, a trusted family member, a fireproof safe — knowing that no single location compromises their funds.