Coming next
Word Search
A classic word search app with categories, unlocks, and short sessions. It is still in development.
Independent app studio
Small apps that respect short, quiet moments.
Sunstone Apps builds mobile puzzles and everyday tools for people who want to open an app, do one thing, and come back later without friction.
About the studio
Independent studio for mobile puzzles and useful apps.
Sunstone Apps is intentionally small. Each app has to earn its place: it should start quickly, save progress clearly, and avoid turning a simple break into setup work. Daily Sudoku covers offline number puzzles. Word Search brings classic hidden-word play next.
Apps from the studio
Recent posts
Notes from the workbench
Practical notes from building, testing, publishing, and operating small apps.
React Native Haptics
Adding Expo haptics to a React Native game without making vibration a sound setting
How Daily Sudoku added a persisted vibration toggle, reused gameplay feedback events, and kept Web bundling safe while using expo-haptics on native.
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React Native Web
Playing the same WAV files in Expo Web and a React Native app
How we reduced the gap between Web and app in an Expo/React Native game by replacing synthetic tones with bundled WAV assets and configurable audio logs.
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React Native Testing
How to keep Playwright E2E useful when React Native Skia renders a canvas
A field note on testing a React Native Skia canvas board with Playwright, replacing DOM-only selectors with a narrow test bridge, and keeping persistence deterministic.
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Technical SEO
Google indexing checklist for Astro sites on Cloudflare Pages
A field checklist for proving that Astro sites on Cloudflare Pages are crawlable, submitted in Search Console, and actually indexed by Google.
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Built by Jonathan Reis
A small studio run by the person shipping the software.
Sunstone Apps is led by Jonathan Reis, a senior tech lead and software developer from Rio de Janeiro. The same hands-on work behind mobile apps, cloud infrastructure, DevOps, SRE, and release reliability shows up here in smaller products with tighter feedback loops.