English · Русский
Letopis (Russian «Летопись», "chronicle") is a personal diary for Android. Every entry is plain
Markdown with its time, tags, mood and attachments, and everything is encrypted on your phone with
a key derived from your password. No account, no cloud of ours, no ads, no analytics. Your diary stays
yours.
Features
Write
- Markdown with headings, quotes and checklists; the time is set automatically.
- Photos, video, voice notes and any files, right inside an entry.
- Mood from 1 to 5; tags by hand, with hashtags, or suggested by AI if you want.
Look back
- A timeline of cards or a grid of tiles; On this day shows what you wrote years ago.
- Calendar, tags, full-text search and statistics: streaks, words, average mood.
- Trash keeps deleted entries for 30 days, with Undo.
Privacy first
- AES-256-GCM encryption, key from your password via Argon2id. Without the password the files are useless.
- Auto-lock, optional fingerprint unlock, optional screenshot blocking.
- The app goes online only when you ask it to: GitHub sync, AI tags, update check.
Your data, your way
- Optional sync through your own cloud — Yandex Disk, Mail.ru Cloud, Nextcloud or any WebDAV server — or a
private GitHub repository: encrypted, both ways, across devices.
- Export to PDF: a book to read or print, with dates, formatting and photos; a whole year or one entry.
- Import from a text diary export, MyDiary or
.md files; export everything to ZIP.
- 15 languages: English, Chinese, Hindi, Spanish, Arabic (right to left), French, Bengali, Portuguese, Indonesian,
Urdu, Russian, German, Japanese, Marathi and Vietnamese.
- Seven fonts (classic, system, serif, Lora, rounded, handwritten, monospace), light and dark themes, six
accent colours.
Screenshots
Download
| Where | Status | Android |
|---|
| letopis.recalltwin.com | ✅ latest APK; Settings → Check for updates | 9 and newer |
| RuStore | 🔜 on moderation | 7 and newer |
| Google Play | later | 7 and newer |
A new version installs over the old one and keeps your entries. The site and RuStore builds are signed
with the same key, so you can switch between them.
[!IMPORTANT]
The password cannot be recovered: that is the point of encryption. Keep it somewhere safe.
How your data is protected
| |
|---|
| Encryption | Argon2id turns your password into a key that unwraps a random data key; files are AES-256-GCM in 1 MiB chunks |
| On the phone | Entries, attachments, thumbnails, settings and the search index are all encrypted |
| Sync | The same encrypted files go to your cloud folder or private GitHub repository; neither sees the text |
| Network | Only your cloud or GitHub, the AI service you chose (HTTPS only, after consent) and the update check, each only on your action |
| Updates | Every build is signed with a key kept outside this repository |
Threat model and known limitations: SECURITY.md.
Build from source
flutter pub get
flutter test
flutter build apk --release --flavor site # or --flavor rustore / --flavor play
Release builds need your own signing key in android/key.properties. The full guide (architecture,
build flavors, signing and key rotation, sync format) is in docs/DEVELOPMENT.md,
in Russian.
Contributing
Bug reports and ideas are welcome in Issues, pull requests too. Please keep the rules
in AGENTS.md: no weakening of encryption, no plaintext on disk, nothing sent over the network
without the user's action. Found a vulnerability? Email [email protected] instead of opening a public
issue.
License
GPL-3.0, with an additional permission to link the RuStore payment SDK
in the RuStore build. © 2026 Alexander Bylinsky.
❤️ Support the author
Letopis is free: no ads, no subscriptions, no paid features. Everything is available to everyone,
and it will stay that way. If the app is useful to you, you can say thank you with a one-off payment
of any amount.
In the app: Settings → Support the project. A payment unlocks nothing; it is just a thank-you.
Free ways to help: ⭐ star the repository, tell a friend, report a bug.
