Lystra vs SecDocKeeper
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Lystra
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Lystra is your clean, offline-first space to instantly capture thoughts, todos, and ideas—no distractions, no noise. Write down what matters the moment it hits you. Add todos with a single tap, mark them done, or swipe to delete. Pin the most important for quick access. Whether it’s a quick reminder, a task, or a passing thought—you’ll always know where it is. With speech-to-text, you can record ideas hands-free, in any language. It detects what you’re saying and writes it down. Fast. Use customizable widgets to keep your most important list on your Home Screen, always visible, always synced. Lystra is not just a notes app—it’s your organized mind on autopilot. Privacy Policy: https://lystrall-pp.netlify.app/ Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
SecDocKeeper
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Keep your most sensitive documents secure, local, and strictly in your hands. SecDockKeeper is a local-first, end-to-end encrypted vault designed for the files you cannot afford to lose or leak. Whether it's your passport, medical records, tax forms, or confidential contracts, SecDockKeeper ensures your data stays firmly on your device. There are no accounts to create, no cloud servers to trust, and absolutely zero telemetry. IMPORTANT: Your vault is secured by a master password known only to you. If you lose your password, no one—not even us—can recover your data. CORE FEATURES Military-Grade Encryption: Your master password derives a 256-bit key on the device using Argon2id. Every single document gets its own AES-256-GCM data key (envelope encryption). Smart On-Device OCR: Automatically scan and tag imported images (like passports, IDs, and invoices). All text recognition happens entirely locally, meaning your data never leaves your phone. Total Organization: Group your documents into folders, apply color-coded tags, and filter with a single tap. All metadata, names, tags, and full-text search indexes are secured inside a locked SQLCipher database. Hidden "Stealth" Tags: Need plausible deniability? Create hidden tags that are stored only as HMAC hashes. They are entirely invisible in lists and autocomplete, revealing their linked documents only when you type the exact tag name into the search bar. Secure Split-Sharing: Safely share individual documents. Export a file as an encrypted .sdkblob and a separate .sdkkey.json. Send the file over one channel and the key over another for maximum security. Portable Offline Backups: Export your entire vault as a single, fully encrypted archive (blobs and database only, no key material). Easily restore it on a new device using your original master password. Biometric Convenience: Quickly unlock your vault using Face ID or Touch ID. Your master password remains safely sealed in your device’s platform keychain. Anti-Snoop Defaults: The app immediately auto-locks when sent to the background. Decrypted plaintext is strictly short-lived, and temporary viewing directories are automatically wiped every time the vault locks. ABSOLUTE PRIVACY We believe privacy is a default, not a feature. SecDockKeeper contains absolutely zero analytics and no third-party SDKs in the hot path. There are no network calls for document handling. The only journey your files take is from your device's file picker directly into your encrypted, on-device vault. OPEN SOURCE & AUDITABLE Trust requires transparency. SecDockKeeper is 100% open source under the Apache 2.0 license. Our cryptography, database schema, and import paths are fully auditable by anyone.
Screenshots
Verdict
The clearest difference is in-app purchases: SecDocKeeper at none against Lystra's 2. SecDocKeeper also leads on iOS requirement (15.5 vs 17.0). On price, ads 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
Both are free to download. Lystra sells 2 in-app purchases, starting at $0.39 per 7 days. SecDocKeeper asks for nothing beyond the download.
| Parameter | Lystra | SecDocKeeper |
|---|---|---|
| Price | Free | Free |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 17.0 | 15.5 — better |
| Further details — not scored | ||
| Size | 14 MB | 66 MB |
| Age rating | 4+ | 4+ |
| Developer | Emanuele Di Pietro | Valentin Sobolev |
In-app purchases
Lystra
- All Access$0.397 Days
- All Access$7.991 Year
SecDocKeeper
No in-app purchases









