Playful things,
built for the web.
DevNull Studio is a tiny indie studio in Tokyo. We make browser games and tools that make live streams more fun. Everything runs right in your browser — free, no install, no account, no tracking.
Games
SUMI HOTARU 墨蛍
Draw walls with an ink brush to guide a bouncing firefly to the stars — but your ink never disappears, and slowly becomes your own maze. Every run ends as a unique sumi-e painting on a hanging scroll, which you can save and share.
UI is in Japanese, but the game teaches itself in seconds: draw a line, the firefly bounces, reach the star. Best on iPad with Apple Pencil.
Play now — freeLab
Prototypes of tools for live streamers — a tiny garden that grows from your chat, and a poll where the options race each other. Each demo has a built-in chat box so you can try the whole loop without setting anything up.
- Comment Garden — viewers' comments grow grass, bloom flowers, launch fireworks. A quiet chat attracts a cat.
- Race Poll — type "1" in chat and watch that option sprint.
Streaming & fan content
Streaming, videos and clips of our games are welcome — no permission needed. Monetization through official platform features (YouTube Partner Program, Twitch subs, etc.) is fine. Please credit the game and link to this site. Full guideline (Japanese): guidelines.
Contact
Commissions, collaborations, or just impressions of the games — all welcome. A human replies: contact[at]devnull-studio.com