Your Agentic Coding Environment, Everywhere.
Merlin is a web app you launch on a Linux box or a Mac. It boots a terminal in your browser, with tmux and your AI agents already installed (Claude Code, OpenCode, Gemini, Codex). Bring your own subscriptions, no middleman. It comes with a file browser, a commit viewer, a notes app, and a scheduler. All wired to the same project, talking to each other. You reach it from any browser, on any device. That's it.
Why
Today, I code primarily through AI agents (Claude Code, OpenCode, and others). That works well at a desk. It doesn't work when I'm on my phone, on the train, or stepping out of a meeting room with five minutes to push a fix. Existing AI coding tools assume you have your laptop. I needed a dev environment that travels with me, runs my agents, and stays accessible from any browser, including mobile.
Merlin started as my own daily tool. It's now open source. Merlin Cloud is the SaaS version: a managed, hosted version for anyone who wants the same workflow without running infrastructure.
Speak Instead of Typing
A microphone button on every text input. Press it and your speech transcribes into the terminal or prompt via Whisper. Useful on a phone where typing is slow, or when your hands are busy.
File Browser
A file browser with full access to your machine. Navigate any directory, preview images, open 3D models. Everything your laptop has, in your phone's browser.
Diff Viewer
Browse your git history and inspect what the agent changed. Walk through commits and read colored diffs in the same browser tab as the terminal.
Schedule Agentic Jobs
Agents don't have to wait for a prompt. Pair an instruction with a schedule, and the agent fires on its own, on the server. Useful for nightly reports, overnight research, recurring code maintenance.
Markdown Notes Shared With Your Agent
Markdown notes in your project repo. You and the agent both read and write them, which gives the agent persistent memory across sessions. Pair them with a scheduled job and the notes become a living knowledge base. The agent enriches, links, and curates them on its own.
No Server, Use Ours
Merlin runs for free on any Linux box or Mac you have: laptop, Raspberry Pi, cheap VPS. Open source, no account required.
Don't have a machine? Merlin Cloud gives you an isolated sandbox per project: 30 GB disk, 2 CPU, 8 GB RAM, up to 5 in parallel, for €25/month. Each one comes with Claude Code, OpenCode, Gemini, Codex, and Merlin pre-installed.
Either way, Merlin Cloud provides the access layer: HTTPS tunnel for any-browser access, secure authentication, Whisper transcription pre-configured. Run on your own infrastructure or ours.
First two weeks are on me.
sign_upFinal Thought
If coding no longer requires a desk, then sitting at one becomes a choice, not a constraint. The payoff isn't only efficiency. The payoff is you get to go outside. Hike. Put your kids to bed. Watch the sun set. And the product still ships.