Transmission Log

Transmissions

Updates from the Koin engineering team.
Changelogs, deep dives, and release notes.

Oct 02, 2026 Beta

Co-op Is Here (Beta)

Host a game from your library, send a link, and up to three friends join from their browser. No ROM needed on their end. One of our longest-running projects, now ready to try.

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Dec 09, 2025 Major Release

Introducing Koin.js

We built a "Netflix-grade" retro game engine for the web. Open source, zero-lag input tiers, thread-offloading for N64/PS1, and mobile-first haptics. Read the story behind the code.

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