Private by design. Simple by choice.
Open-source apps and games that respect you: no ads, no tracking, no data collection.
Most apps today want your data, your attention and your internet connection. We build the opposite.
| 🚫 No ads | Not now, not ever. |
| 🕵️ No tracking | No analytics, no trackers, no third-party SDKs spying on you. |
| 📴 Offline first | Our apps work fully without an internet connection. |
| 🔒 Your data stays yours | Everything stays on your device. We never see it. |
| 🔓 Open source | Every line of code is public. Read it, audit it, learn from it. |
| 🆓 Free | No accounts, no subscriptions, no paywalls. |
| App | What it does | Platform |
|---|---|---|
| 🧮 Calculator | A clean calculator with a scientific mode, unit converter (length, weight, temperature, area, speed) and an age/date calculator. | Android |
| 💰 PocketTally | An offline income and expense tracker with wallets, budgets, net worth and a yearly review. Many languages, no accounts, no cloud. | Android |
| 📄 Paperwise | Offline PDF tools: merge, split, compress, convert images to PDF and more. Your documents never leave your phone. | Android |
| 🌐 Verto | A fast offline translator. Download only the language packs you need, then translate with no internet. | Android |
| App | What it does | Platform |
|---|---|---|
| 🫀 Anatomo | An interactive human body atlas. Explore male and female models, tap any part to see what it does and what helps or harms it, and test yourself with quizzes. Many languages, dark and light mode. | Android, Windows |
| 😴 Somno | An offline sleep tracker with no wearable needed. It detects sleep from phone inactivity, sets a goal for your age, and tracks streaks, consistency and naps. | Android |
| App | What it does | Platform |
|---|---|---|
| 🛂 Stamply – Visa Checker | Check visa and passport requirements. Data is bundled in the app, with an optional manual data update and no login. | Android |
| Game | What it does | Platform |
|---|---|---|
| 🎯 Pow2 | A simple, addictive swipe-and-merge number puzzle. Endless play, themes, sound and vibration options, and stats. | Android |
| 🧩 Cuboo | A relaxing block puzzle: place shapes, clear lines and beat your best score. Light and dark mode, smooth animations, scores and achievements saved on your device. | Android |
Every app and game is free, ad-free and open source, and works offline. Internet is used only for things you choose, like downloading a language pack or checking GitHub for updates.
Find screenshots, details and privacy policies for every app on lumio-apps.online.
More privacy-first apps and games are on the way.
Our apps are distributed only through GitHub. There is no Play Store account and no middleman between you and the code.
- Open the app's repository from the table above.
- Go to Releases and download the latest signed
.apk. - Install it on your Android phone (or run the Windows build, where an app offers one).
Every release is built from the public source code in this organization, and the apps can check GitHub for updates themselves.
- Privacy is the default, not a setting you have to find.
- The app should work without internet whenever possible.
- Simple and focused: each app does one job and does it well.
- Transparent: open code, honest permissions, no hidden behavior.
- Built for everyone: multi-language support and a clean, modern design.
Found a bug, have an idea or want to translate an app into your language? You're welcome here.
- 🐛 Open an Issue in the app's repository
- 💡 Suggest a feature in the repository's Issues
- 🌍 Send a Pull Request with a new translation or a fix
Please keep the spirit of the project in mind: no ads, no trackers, no data collection. Contributions that add any of these can't be accepted.
Apps are built with Flutter and Dart.