Run claude,
gemini and
codex side-by-side -
each in its own git worktree.
Free and open source (AGPL-3.0). Spawns the CLIs you already have installed, in PTYs. Stays on your existing Claude Pro / Max plan - off the new $200 Agent SDK credit pool.
Free forever · AGPL-3.0 · macOS · Linux + Windows soon
Free · Open source · AGPL-3.0
Termic is free. CLIs run on your existing plan.
Termic spawns the CLI binaries you already have - claude, gemini, codex - and inherits their auth. On June 15, 2026 Anthropic moved the Agent SDK (plus claude -p, GitHub Actions, third-party harnesses) onto a separate $200/mo credit pool at API rates. The interactive claude CLI - the one Termic spawns - stayed on the regular Pro / Max subscription.
01
Free, open source, AGPL-3.0
Termic itself costs nothing and never will. Source is on GitHub. Fork it, audit it, package it - derivatives stay AGPL, which is what keeps the next 'open core' tool from quietly going proprietary.
02
Off the SDK credit meter
Tools built on the Claude Agent SDK bill against the $200/mo credit pool at API rates. Termic spawns the interactive claude CLI directly - the one Anthropic kept on the regular subscription. No per-token markup, no surprise invoice.
03
The best harness is their own harness
Anthropic / Google / OpenAI ship features in their CLIs first - that's where their teams put the work. SDK wrappers chase it. Termic just runs the CLI, so the day a model upgrades or a slash-command lands, you're using it.
workspaces
New worktree, or just use the repo
New worktree creates a separate copy on disk, branched off your default. Run a dev server on a unique port, ship a feature, archive when done.
Open repo attaches an agent to your actual checkout - for one-off questions, README edits, the kind of small thing that doesn't deserve a branch.
You don't need parallel work to get value out of Termic. Even with a single project on a single branch, the app gives you tabbed agents, a built-in editor and diff view against HEAD, a Run/Setup panel that streams your dev server, and one-click claude --resume / codex resume --last per workspace. It's a better day-to-day shell for the CLI you're already running.
under the hood
Native desktop, web rendering
Tauri shell, web frontend. Editor and terminal are off-the-shelf libraries we picked after benching alternatives in WKWebView.
Rust backend, WKWebView frontend. ~10MB bundle (vs Electron's ~120).
UI. Vite HMR for dev, single bundle for prod.
Editor. ~150KB; Monaco was slower in WKWebView when we tested.
Terminal. WebGL renderer was the only one without visible row gaps in TUI apps.
PTYs on macOS / Linux / Windows. Same crate Wezterm itself uses.
State. No reducers, no thunks - just hooks.
questions
The actually-asked questions
Skipping the marketing FAQ stuff. Real questions, plain answers.
Does this work with my Claude Pro / Max subscription?
claude CLI - same binary you'd run in iTerm, same auth, same quota. Anthropic kept interactive Claude Code on the subscription when they split the Agent SDK into its own credit pool on June 15, 2026.How is this different from Conductor.build?
claude -p, GitHub Actions, and third-party harnesses) bills against a separate $200/mo credit pool at API list prices. Termic doesn't touch the SDK - it spawns the CLI binary directly, which stays on the regular subscription.Does Termic see my prompts or read my code?
tail -f it if you want to see what's happening) - that's all.Is it actually open source?
Linux and Windows?
Stop paying twice for the same agent.
Free, AGPL-3.0. macOS now; Linux and Windows soon.