# Shamir Backup — Keep your phrase safe

> Keep your phrase safe (iPhone/iPad app by Vladimir Lobanov.)

- Source: https://appshunter.io/ios/app/shamir-backup/id6745005548 (this page in markdown: same URL + `.md`)
- Developer: [Vladimir Lobanov](https://appshunter.io/developer/1810400446)
- Category: Utilities, Finance
- Price: $19.99
- Age rating: 4+
- Requires: iOS 18.4 · 7 MB
- Languages: American English
- Released: 2026-03-19
- Data updated: 2026-08-30
- User reviews in markdown: https://appshunter.io/ios/app/shamir-backup/id6745005548/reviews.md

## What is 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.


## Version history (last 1 release)

### 1.0 — 2026-03-19

No release notes.

## More apps by Vladimir Lobanov

- [Loban AI Image and Video](https://appshunter.io/ios/app/loban-ai-image-and-video/id6759264234)
- [Keepick: Photo Cleaner](https://appshunter.io/ios/app/keepick-photo-cleaner/id6800228517)

All apps by Vladimir Lobanov: https://appshunter.io/developer/1810400446

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-30.*