I am a Flutter Developer from Japan. I have successfully released 50+ high-quality apps to the App Store and Google Play. This page serves as a comprehensive portfolio of my work, featuring 49 open-source repositories showcasing core logic and professional implementation.
Each project is built with Flutter, supports 50+ languages (unless specified), and is optimized for both iOS & Android.
| # | App Name | Description | Repository |
|---|---|---|---|
| 1 | Barcode Reader | High-speed Continuous QR/Barcode Scanner for inventory and events. Export results to CSV.  |
Link |
| 2 | BMR Calculator | A high-precision BMR calculator built with Flutter. Core logic and source code.  |
Link |
| 3 | Bingo Game 75 | A simple and reliable Bingo Game Machine built with 6 cards.  |
Link |
| 4 | Bingo Game Housie 90 | Professional 90-ball Bingo (Housie) caller machine with 6 cards.  |
Link |
| 5 | Bingo Machine 75 | A high-performance random number selector and bingo caller.  |
Link |
| 6 | Bingo Machine 90 | Professional 90-ball lottery and bingo machine. Optimized for rapid selection.  |
Link |
| 7 | Biorhythm | Professional Biorhythm calculator to visualize physical, emotional, and intellectual cycles.  |
Link |
| 8 | Cards Calculation | A specialized score calculator for playing card games. Efficiently manage points.  |
Link |
| 9 | Cards FreeCell | A classic FreeCell Solitaire game with clean UI and smooth gameplay logic.  |
Link |
| 10 | CIDR Calculator | A high-performance IPv4 CIDR and subnet calculator for network engineers.  |
Link |
| 11 | Coffee Timer | An atmospheric, hourglass-style timer visualizing the brewing process.  |
Link |
| 12 | Compass Retro | A high-precision digital compass with a classic retro design.  |
Link |
| 13 | Dice Roller | A high-speed, reliable digital dice roller. Perfect for board games and RPGs.  |
Link |
| 14 | Domain Inspector | A powerful domain and WHOIS information inspector for developers.  |
Link |
| 15 | Fortune Slip | A traditional Japanese Fortune Slip (Omikuji) simulator.  |
Link |
| 16 | Galmoji | A unique text converter for Japanese "Galmoji" slang. (Japan-only release)  |
Link |
| 17 | Gear Logic Puzzle | A creative gear-connection logic puzzle. Simulate mechanical rotations.  |
Link |
| 18 | Barcode Generator | A versatile QR and barcode generator to create and share high-quality images.  |
Link |
| 19 | Grouping Tool | An interactive team-splitting utility using animated cards for random assignment.  |
Link |
| 20 | Hourglass | A beautiful and customizable visual hourglass timer with analog aesthetics.  |
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| 21 | Inunohi Calendar | Specialized calendar for "Inunohi", a Japanese custom for safe childbirth.  |
Link |
| 22 | Ladder Lottery | A fun and interactive "Amida-kuji" (Ladder Lottery) for 2 to 9 participants.  |
Link |
| 23 | Lottery Nixie | A retro-styled digital lottery machine featuring 5 glowing Nixie tubes.  |
Link |
| 24 | Lottery Slot | A professional reel-style digital raffle machine with slot animations.  |
Link |
| 25 | Lucky Box | A traditional Japanese-style raffle simulator with triangular paper lots.  |
Link |
| 26 | Lunar Age | A visual moon age calendar with realistic imagery. (Japan-only release)  |
Link |
| 27 | Mixing Colors | A creative color-mixing puzzle. Challenge your sense by blending shades.  |
Link |
| 28 | Number Roulette | A highly customizable number roulette with voice-guided results.  |
Link |
| 29 | Pitch Tuner | A high-precision instrument tuner with a responsive analog-style meter.  |
Link |
| 30 | QR Analyzer | A professional QR code analysis tool. Inspect internal modules and ECC.  |
Link |
| 31 | Ramen Timer | A minimalist, high-speed timer optimized for instant cup noodles.  |
Link |
| 32 | TTS Recorder | A powerful Text-to-Speech utility with WAV recording and 300+ voices.  |
Link |
| 33 | Voice Recorder | A minimalist voice recorder with retro analog tape interactions.  |
Link |
| 34 | Retro Walk | Explore Japan using historical maps from the 1950s with GPS tracking. (Japan-only release)  |
Link |
| 35 | Roulette | A professional-grade customizable roulette with weighted ratios.  |
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| 36 | American Roulette | A minimalist American-style roulette wheel simulator with voice.  |
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| 37 | European Roulette | A minimalist European-style (single zero) roulette wheel simulator.  |
Link |
| 38 | Mole Digging | A single-stroke pathfinding puzzle game. Guide the mole through every tile.  |
Link |
| 39 | Sound Generator | A professional-grade synthesizer with LFO and real-time oscilloscope.  |
Link |
| 40 | Spirit Level | A simple and high-precision level measuring angles using device sensors.  |
Link |
| 41 | Stopwatch | A lightweight, high-precision stopwatch with lap tracking and haptic feedback.  |
Link |
| 42 | Sunrise Calendar | A comprehensive solar calendar for all prefectures in Japan. (Japan-only release)  |
Link |
| 43 | Tap Lottery | A fun random selector tool using multi-touch to pick winners.  |
Link |
| 44 | TCP Port Scanner | A high-performance network diagnostic tool. No root access required.  |
Link |
| 45 | 25 Puzzle | A classic 5x5 sliding tile puzzle. Solve it to reveal adorable cat photos.  |
Link |
| 46 | Coin Toss | A customizable coin toss simulator with adjustable probability ratios.  |
Link |
| 47 | Water Timer | A soothing, visual water-filling timer with elegant gradients.  |
Link |
| 48 | Watt Conversion | A high-precision microwave wattage conversion tool for cooking.  |
Link |
| 49 | Wheel Lottery | A digital reproduction of the classic Japanese "Fukubiki" machine.  |
Link |
- Framework: Flutter (Dart)
- Localization: 50+ Languages per app (Global Apps)
- Platforms: iOS, Android
- YouTube: Try This App Now
- Store: Google Play / App Store
© 2026 Akira Ohmachi / ao-system, Inc. - Focused on making small tools that solve big problems.