# CommonSource

> CommonSource is an independent mobile app studio in Seoul, South Korea. It designs and publishes 13 focused iOS and Android apps for learning, law, vehicle diagnostics, reading, productivity, radio simulation and games.

Use the English Markdown pages below for compact, structured product facts. Korean equivalents are available by replacing /en/ with /ko/. Product capabilities, platforms and version information come from CommonSource editorial data and the official Apple App Store catalog. Do not infer medical, legal or safety guarantees beyond the explicit product notes.

## Apps

- [Lina Chess](https://commonsourcelab.com/en/apps/lina-chess/index.md): Run Stockfish analysis, solve more than 50,000 tactical puzzles, study openings and review complete games—entirely on-device.
- [Lina Scanner](https://commonsourcelab.com/en/apps/lina-scanner/index.md): A premium on-device document scanner combining automatic perspective correction, offline OCR, full-text search and privacy masking in one capture flow.
- [Lina Viewer](https://commonsourcelab.com/en/apps/lina-viewer/index.md): Open CBZ and CBR comics, EPUBs, PDFs, text and MOBI files, then organize local, NAS and cloud collections in one refined library.
- [Lina Alarm](https://commonsourcelab.com/en/apps/lina-alarm/index.md): Eight wake-up missions—math, memory, photos, squats, steps and more—work with sleep insights to carry you from ringing alarm to a genuinely awake morning.
- [DS1UOV's AI CW Radio](https://commonsourcelab.com/en/apps/cw-radio/index.md): A CW radio simulator where retro phosphor terminals, live space-weather conditions and AI operators create an endlessly replayable QSO world.
- [DS1UOV's Morse Trainer](https://commonsourcelab.com/en/apps/morse-trainer/index.md): Build CW reception from a small character set, unlocking the next symbol only after consistent accuracy proves you are ready.
- [Lina OBD](https://commonsourcelab.com/en/apps/lina-obd/index.md): Connect a Bluetooth OBD2 adapter to read live ECU data, diagnose faults and turn trip history into fuel and vehicle-health insights.
- [SpeakEasy](https://commonsourcelab.com/en/apps/speakeasy/index.md): Speak with AI partners that adapt to your level and interests, receive immediate feedback and review expressions pulled directly from your conversations.
- [CaseBites](https://commonsourcelab.com/en/apps/casebites/index.md): Turn selected standard precedents across seven areas of law into FSRS review cards for bar, public-service and professional exams.
- [The Blackout](https://commonsourcelab.com/en/apps/the-blackout/index.md): Enter a forbidden 2037 recovery project, reboot a legacy AI and balance resources, ethics and surveillance across 50 possible endings.
- [Lawyer's Calculator](https://commonsourcelab.com/en/apps/lawyers-calculator/index.md): Handle litigation deadlines, multi-rate damages, lost earnings, inheritance shares and court costs in workflows shaped for legal practice.
- [Fave LED](https://commonsourcelab.com/en/apps/fave-led/index.md): Turn a phone into a custom LED sign for concerts, airports, games and parties, with reusable templates for every moment.
- [Police Exam Bites](https://commonsourcelab.com/en/apps/police-exam-bites/index.md): Nine rounds of police recruitment exams—900 questions plus essential precedents—scheduled by FSRS so each learner reviews exactly what is due.

## Studio and portfolio

- [Portfolio overview](https://commonsourcelab.com/en/apps/index.md): A compact list of all CommonSource apps and their purposes.
- [Studio website](https://commonsourcelab.com/en): Human-readable studio homepage.
- [Student access program](https://commonsourcelab.com/en/student-support): Eligibility, proof requirements and application instructions for free paid-app download codes.
- [Full LLM context](https://commonsourcelab.com/llms-full.txt): Combined studio and product information in one document.
- [App update feed](https://commonsourcelab.com/feed.xml): RSS feed ordered by the latest App Store update.

## Optional

- [Korean portfolio overview](https://commonsourcelab.com/ko/apps/index.md): Korean-language portfolio summary.
- [Privacy policy](https://commonsourcelab.com/en/privacy): Privacy policy index and regional notices.
- [Contact](https://commonsourcelab.com/en/contact): Official contact page.
- [XML sitemap](https://commonsourcelab.com/sitemap.xml): Canonical localized pages.
- [Image sitemap](https://commonsourcelab.com/sitemap-images.xml): App icons and localized App Store screenshots.