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Coterm
Self-hosted pair programming, built on Mosaic
Coterm is an open-source fork of Mosaic/cmux that adds self-hosted real-time pair programming. Two developers can drive the same live Claude Code session, while the collaboration backend runs in their own Cloudflare account.
Hi Product Hunt! I'm Simon, the maker of Coterm.
AI coding agents are great when you work alone, but pairing around them still feels broken. Screen sharing turns one developer into a passenger, while chat loses the shared terminal, browser, and agent context.
I built Coterm so two developers can join the same live workspace and drive the same Claude Code or other terminal-agent session together. You can keep the browser beside the terminal, share previews, and stay in the same context throughout the session.
A few principles mattered to me:
- Native macOS app powered by libghostty
- Works with any terminal-based coding agent
- Collaboration is self-hosted in your own Cloudflare account
- Free and open source under GPL-3.0
Coterm descends from the cmux/Mosaic codebase and keeps full attribution in the repository.
This is an early public release, and I would especially value feedback on:
1. Does the pair-programming flow feel natural?
2. Is the self-host setup clear enough?
3. Which coding-agent workflow should we support next?
Thanks for taking a look!
About Coterm on Product Hunt
“Self-hosted pair programming, built on Mosaic”
Coterm was submitted on Product Hunt and earned 0 upvotes and 2 comments, placing #10 on the daily leaderboard. Coterm is an open-source fork of Mosaic/cmux that adds self-hosted real-time pair programming. Two developers can drive the same live Claude Code session, while the collaboration backend runs in their own Cloudflare account.
On the analytics side, Coterm competes within Developer Tools, GitHub and Vibe coding — topics that collectively have 557.8k followers on Product Hunt. The dashboard above tracks how Coterm performed against the three products that launched closest to it on the same day.
Who hunted Coterm?
Coterm was hunted by SimonAKing. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Coterm including community comment highlights and product details, visit the product overview.
SimonAKing