Seedkeeper vs Crypto String
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Seedkeeper
This app generates and securely stores passwords and mnemonic seedphrases, working in conjunction with a smart card. It offers PIN-protected access and supports various security specifications without requiring account registration or collecting personal data.
- Generate and store passwords and seedphrases
- PIN-protected access
- NFC card scanning for operation
- Supports BIP39 protocol
- No account registration or data collection
- Open-source application
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This application is the ideal companion to your Seedkeeper smart card, allowing you to generate and store a wide variety of secrets, including passwords and mnemonic seedphrases. Seedkeeper is the quickest and easiest way to generate and secure all the secrets linked to your digital life. In just a few clicks, you can create a strong password and store it in the secure memory of your Seedkeeper card. Easily import your login or authentication credentials, and manage them at your fingertips, wherever you are. Features : - No account registration or KYC: simply scan your card via NFC and operate autonomously. - PIN-protected access. - Compatible with BIP39 protocol, QRCode and SeedQR specifications. - No storage of sensitive information on the application. - No collection of personal data. - The application is open-source. Features : - Generate and import strong passwords or mnemonic seedphrases (BIP39). - Specify wallet descriptors. - Import free text. - Create an encrypted backup and import it into another Seedkeeper card.
Crypto String
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Crypto String is the ultimate secure text encryption app using military-grade AES-256-GCM with authentication. Protect your sensitive information with powerful encryption and Base64 encoding — all 100% offline and private. Core Features • AES-256-GCM Encryption – Military-grade algorithm with custom keys for unique results • Base64 Encode/Decode – Fast and reliable for data transmission and storage • File Import – Directly import text/keys from local files or iCloud Drive • Smart Key Management – Import keys + eye-icon toggle to view/hide safely • History Records – Auto-save last 10 operations with key hints (only first 4 chars) • Multilingual Interface – Automatic language switching • Dark Mode + iOS Native – Built with Apple CryptoKit for maximum security Security First • 100% Local Processing – Nothing uploaded to cloud • No data collection, no accounts, no tracking • Keys never stored in plain text • One-time purchase, no ads, no subscriptions Perfect for protecting passwords, notes, private messages, or business data. Simple, fast, and truly private. Download Crypto String now and encrypt with confidence!
Screenshots
Verdict
The clearest difference is price: Seedkeeper at Free against Crypto String's $0.99. Seedkeeper also leads on iOS requirement (16.0 vs 18.0). On ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Seedkeeper is free to download; Crypto String costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Seedkeeper | Crypto String |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 1.0 (3 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | — | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 16.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 32 MB | 0 MB |
| Age rating | 4+ | 4+ |
| Developer | Satochip | Xu Wang |
In-app purchases
Seedkeeper
No in-app purchases
Crypto String
No in-app purchases









