AI coding agents have moved past autocomplete. Today's best free ones read your codebase, edit multiple files, run terminal commands, and iterate on failing tests with minimal supervision. Here is a grounded comparison of the free AI coding agent desktop apps actually worth installing in 2026, what each costs in practice, and how to run them at genuinely zero cost.
What counts as "free" here
A free AI coding agent desktop app means two things: the application itself costs nothing to install and use, and you can power it with a model you do not pay for. Some apps bundle free model credits. Others are free but expect you to bring your own API key from a provider with a free tier. Both count, but you should know which kind you are getting before you commit to one.
One caution before we start: Roo Code, the popular Cline fork, was archived in May 2026. Old tutorials still recommend it, but you should not build a workflow on a dead project. If you used Roo Code, Kilo Code publishes an official migration guide, and the Roo README itself names Cline and ZooCode as destinations.
The 5 free AI coding agents worth your desktop
1. OpenCode — the most complete free package
OpenCode is an MIT-licensed coding agent that started in the terminal and now ships a desktop app. It is the closest thing to free end to end: the tool is free, and its OpenCode Zen gateway includes a rotating set of free models, so many users never pay a cent. When the free models are not enough, OpenCode Go costs 10 dollars a month, or you can connect any of more than 75 model providers with your own key.
OpenCode supports 75-plus models, multi-session support, vim-style editing, and LSP integration. It does not store your code server-side. It also plays well with local models through Ollama, which is the cheapest path of all if your hardware can run one. If you want one install that covers the terminal and the desktop without subscriptions, start here.
2. Kilo Code — the best VS Code agent that is free
Kilo Code is an MIT-licensed agent that installs as an extension in VS Code and JetBrains IDEs and also runs as a CLI. In April 2026 it was rebuilt on top of OpenCode, so the same agent now runs across three surfaces with your configuration carried between them.
Kilo Code starts on free models with no credit card required, and it is transparent about prompts and token usage. It kept the custom-mode workflow ex-Roo Code users liked — Architect, Code, Debug, and Ask modes — and added inline autocomplete plus an Agent Manager that runs parallel agent sessions in separate git worktrees so they do not fight over the same working directory. If you want paid convenience later, the Kilo Gateway runs 500-plus models from 60-plus providers at exact provider rates with no markup, and Kilo Pass subscriptions add bonus credits.
For daily agentic coding inside VS Code with maximum model flexibility, Kilo Code is the strongest free option right now.
3. Cline — the most battle-tested, 11M installs
Cline is the original open-source agentic coding extension for VS Code, now past 11 million installs. The tool itself is free and open source under Apache 2.0, but there is an important asterisk: the model is not free. You bring your own API key, connect a flat-price plan, or point it at a local model. Token costs on big tasks are your responsibility.
What Cline buys you is maturity: the largest open-source VS Code agent community, deep MCP support for custom tool integrations, and newer additions like CLI multi-agent teams and scheduled agents. It accepts any major provider — Claude, GPT, Gemini, or local models. Pair it with a free-tier key (more on that below) and it becomes a genuinely free agent; pair it with a strong paid model and it is one of the most capable editors in existence.
4. Google Antigravity — Google's free Individual plan
With Gemini CLI's free tier gone (it stopped serving free accounts on June 18, 2026), Google's free route is Antigravity. The Individual plan costs zero dollars and covers both the Antigravity agentic IDE and the Antigravity CLI, running on Gemini models. Google does not publish the weekly limits, and the product is closed source, which are real caveats if you care about transparency.
For students and solo developers who want a polished Google-native IDE with an agentic workflow and no API key to manage, Antigravity is the simplest free start available in 2026. Expect weekly usage caps that reset, and have a fallback agent for the days you hit them.
5. Void Editor — the open-source Cursor alternative
Void is a fork of VS Code that builds AI features directly into the editor: autocomplete, inline edits, and chat agents, all native. Think of it as the open-source answer to Cursor. The critical difference from Cursor is architectural: your messages go directly to your chosen provider with no middleman server, which matters if you care about where your code flows.
Void is still maturing and is not as far along as the agents above, but it is already usable for daily work. If the Cursor experience is what you want — editor-first AI, not a sidecar extension — without the price tag or the data routing, Void deserves a look.
Honourable mentions
- Continue — free, declarative config, full bring-your-own-key support and strong local model support. Best for JetBrains users who want a configurable assistant rather than a full agent.
- Aider — the terminal-first agent with git-native auto-commits. Free tool; you pay only the model provider. Still a favourite among developers who live in the shell.
- Pi — free and MIT-licensed; you supply the model.
- GitHub Copilot Free — proprietary, but genuinely free at 2,000 completions per month with a fixed model set. Enough for light use inside your existing editor.
How to run them at zero cost: free model keys
The apps above are free, but agentic coding needs a model. These free model sources are how developers run Cline, OpenCode, and Continue without spending anything:
1. Google AI Studio — free Gemini API key, generous enough for most coding tasks; the standard free key developers pair with open-source agents.
2. Groq — a free tier for very fast inference on open models.
3. Cerebras — free credits for fast inference, widely used for coding workloads.
4. OpenRouter — free model endpoints with no credit card required for a rotating set of models.
5. Ollama — run open models entirely on your own machine. Zero API cost forever, limited by your hardware.
The practical recipe: install OpenCode or Kilo Code for its bundled free models, keep a Google AI Studio key configured as your fallback provider in Cline or Continue, and switch to Ollama when you are offline or want complete privacy.
Which one should you install?
- One app, terminal and desktop, minimal fuss: OpenCode with its Zen free models.
- Daily agentic coding inside VS Code: Kilo Code (free models, no card) or Cline (bring a free key).
- You miss Roo Code's modes: Kilo Code — it kept Architect, Code, Debug, and Ask, and ships an official migration guide.
- Polished Google IDE, no key management: Google Antigravity's free Individual plan.
- Cursor-style editor, open source: Void.
- Maximum privacy, zero spend forever: OpenCode or Aider pointed at Ollama with a local model.
Key takeaways
- OpenCode, Kilo Code, Cline, Google Antigravity, and Void are the strongest free AI coding agent desktop apps in 2026 — all verified active, all genuinely free to install.
- Roo Code was archived in May 2026; do not follow old tutorials that recommend it.
- "Free app" does not always mean "free model" — Cline, Continue, and Aider need your own key, which is why free sources like Google AI Studio, Groq, Cerebras, OpenRouter, and Ollama matter.
- Kilo Code is the natural home for ex-Roo Code users, keeping the custom modes and adding parallel agents in git worktrees.
- Start with one agent, one free model source, and a small task. The best agent is the one that fits your actual usage pattern with zero surprises on the bill.