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Best free / open-source / bring-your-own-key
No subscription: you pay only for model usage, or nothing.
Preliminary · based on public infoShort answer: pick Cline. Runner-up: Aider. On a budget: Gemini CLI.
Cline
Free and open source for individuals; pay for inference at cost or BYOK. Enterprise: contact sales.
Visit siteAider
Free and open source (Apache 2.0); bring your own model API key or local model.
Visit siteGemini CLI
Open source. Free with Google login: 1,000 requests/user/day; free Gemini API key: 250/day; Google AI Pro 1,500/day, Ultra 2,000/day; pay-as-you-go via API/Vertex.
Visit siteScored ranking
| # | Tool | Score /100 | Status | Pricing |
|---|---|---|---|---|
| 1 | Cline | 79 | Preliminary · based on public info | Free and open source for individuals; pay for inference at cost or BYOK. Enterprise: contact sales. Price checked 2026-10-14 |
| 2 | Aider | 77 | Preliminary · based on public info | Free and open source (Apache 2.0); bring your own model API key or local model. Price checked 2026-10-14 |
| 3 | OpenCode | 76 | Preliminary · based on public info | Free and open source, any provider. Optional OpenCode Zen pay-as-you-go balance (starts at $20). Price checked 2026-10-14 |
| 4 | Gemini CLI | 73 | Preliminary · based on public info | Open source. Free with Google login: 1,000 requests/user/day; free Gemini API key: 250/day; Google AI Pro 1,500/day, Ultra 2,000/day; pay-as-you-go via API/Vertex. Price checked 2026-10-14 |
| 5 | Kilo Code | 71 | Preliminary · based on public info | Free and open source (BYOK/local, $0); Kilo Gateway pay-as-you-go; Kilo Pass from $19/mo; Teams $15/user/mo; Enterprise custom. Price checked 2026-10-14 |
| 6 | Continue | 68 | Preliminary · based on public info | Open-source codebase remains free; Continue has been acquired by Cursor and no paid plans are offered on continue.dev. Price checked 2026-10-14 |
Scores are editorial estimates from vendor documentation and public reporting, applied using our rubric. A "partly hands-on tested" badge means some fixed tasks were run (see the tool's test log), but the score itself has not been re-derived from tests yet.
FAQ
What is the best tool for free / open-source / bring-your-own-key?
Our current pick is Cline, with Aider as runner-up and Gemini CLI as the budget pick. These are preliminary picks from public information applied to our rubric; check the ranking table for scores and evidence status.
How much does Cline cost?
Free and open source for individuals; pay for inference at cost or BYOK. Enterprise: contact sales. (Checked against https://cline.bot/pricing on 2026-10-14.)
What is the cheapest good option for free / open-source / bring-your-own-key?
Our budget pick is Gemini CLI: Open source. Free with Google login: 1,000 requests/user/day; free Gemini API key: 250/day; Google AI Pro 1,500/day, Ultra 2,000/day; pay-as-you-go via API/Vertex.
Which tools did you compare?
We ranked 6 tools: Cline (79), Aider (77), OpenCode (76), Gemini CLI (73), Kilo Code (71), Continue (68). Scores are out of 100.
Are these rankings based on hands-on tests?
Not yet. Every score here is preliminary, based on vendor documentation and public reporting. Hands-on results will be published with dated evidence logs.
Do affiliate commissions affect the ranking?
No. Affiliate status is recorded separately and is never a scoring input. See our disclosure page.