Two of the names that used to show up on every "free AI coding tool" list don't belong there anymore. Tabnine stopped selling to new customers after Tricentis acquired it on 30 July 2026 — existing customers only now, no public pricing page. Cody went enterprise-only back on 23 July 2025, minimum contract around $16K/year. Neither is a free option for an individual developer picking a tool today, whatever older roundups still say.

What's left is smaller, but it's real: Cline, Aider, and Zed are still free and open source, with no subscription waiting at the end of a trial.

  • Cline — VS Code agent, Plan/Act modes, terminal execution, MCP support. Our top pick here.
  • Aider — terminal-native pair programmer with tight git integration, if you don't want an editor in the loop.
  • Zed — Rust-native open-source editor, agent-agnostic via ACP, so you're not locked into one vendor's AI layer.

Two things worth knowing if you're choosing based on this list specifically:

"Open source" here means the client, not the model. All three are BYOK — you point them at whatever inference you want, local (Ollama, LM Studio) or hosted. If what you're actually after is an open-weight model instead of a hosted one — Kimi K2, DeepSeek, GLM, Qwen — that's a different axis entirely, and worth being explicit about which one you're solving for before you pick a tool.

Cline's "free" has started growing an edge. There's now a $9.99/mo optional add-on (ClinePass) for discounted access to open-weight models, and "Cline Cloud sessions" — tasks that keep running in a hosted sandbox after you close the editor — shipped in October with no pricing disclosed yet. Neither is required to use Cline for free as before; both are worth knowing about before you assume "free" means "nothing ever costs extra."

None of this changes the headline: if you want zero subscription and no vendor lock-in, Cline, Aider, and Zed are genuinely capable choices in 2026, not a compromise tier below the paid tools.

Full comparison across all 11 tools we track, with every price re-checked against the vendor's own page: https://devtoolsreview.com/best-for/best-ai-coding-tools-open-source-only/

Disclosure: we earn nothing from the links in this piece. We're not enrolled in an affiliate programme for any tool mentioned here — most of them don't run one. Facts checked directly against vendor pages and the tools' own release notes, current as of early November 2026.