Aider vs Cline
Aider vs Cline (Coding Agents (CLI & Cloud)). Agent test scores: Aider 9.3/10, Cline 9.2/10. Aider scored 0.1 higher overall in our separate rubric v0.1 tests (editions and tasks can differ — see Edition tested and the notes below). Pricing: Aider — Free open source (Apache 2.0); pay your LLM provider; Cline — Extension free; Teams $20/user/mo (first 10 seats free); Enterprise custom.
Every fact on this page comes from our tool records and test logs. Last updated:
- VibeToolRank score
- 9.3/10
- Last tested
- 2026-10-16
- Runs
- 3 runs
- Outcome score
- 9/10
- Edition tested
- Aider 0.86.2 CLI with OpenRouter free model cohere/north-mini-code:free
- Free plan, as measured
- About 1.0K tokens sent and 1.3K received per bugfix run, $0 on a free OpenRouter model
- Free plan
- Yes: free tool, BYO API key or local models
- Price
- Free open source (Apache 2.0); pay your LLM provider
- Pricing checked
- 2026-10-16
- VibeToolRank score
- 9.2/10
- Last tested
- 2026-10-16
- Runs
- 3 runs
- Outcome score
- 9/10
- Edition tested
- Cline CLI 3.0.72 with OpenRouter free model cohere/north-mini-code:free
- Free plan, as measured
- $0 per bugfix run on a free OpenRouter model
- Free plan
- Yes: free for individuals, pay inference only
- Price
- Extension free; Teams $20/user/mo (first 10 seats free); Enterprise custom
- Pricing checked
- 2026-10-16
Side by side
| Field | Aider | Cline |
|---|---|---|
| What it is | AiderOpen-source AI pair programming in the terminal. | ClineOpen-source autonomous coding agent for VS Code. |
| Pricing | AiderFree open source (Apache 2.0); pay your LLM provider | ClineExtension free; Teams $20/user/mo (first 10 seats free); Enterprise custom |
| Free tier | AiderYes: free tool, BYO API key or local models | ClineYes: free for individuals, pay inference only |
| Pricing verified | Aider2026-10-16 | Cline2026-10-16 |
| Edition tested | AiderAider 0.86.2 CLI with OpenRouter free model cohere/north-mini-code:free | ClineCline CLI 3.0.72 with OpenRouter free model cohere/north-mini-code:free |
| Tested on | Aider2026-10-16 | Cline2026-10-16 |
| Outcome score | Aider9 | Cline9 |
| Speed score | Aider10 | Cline9 |
| Cost score | Aider10 | Cline10 |
| Developer experience score | Aider8 | Cline8 |
| Reliability score | Aider10 | Cline10 |
| Overall score | Aider9.3 | Cline9.2 |
What our tests found
Aider
3/3 runs fixed our seeded cart bug (4/4 tests pass) in 9-13s with a free OpenRouter model, without touching the test file. Install needed uv because pip was blocked on the system Python.CLI, free model
- Fixed the seeded bug correctly in 3 of 3 runs, in 9-13 seconds
- Works with free OpenRouter models, so our test cost $0
- Built-in --auto-test loop runs your tests after each edit
- pip install was refused on Debian's system Python; we needed uv
- Unattended runs need several flags (--yes-always, --message, --test-cmd)
- Free model slugs change; one we tried returned 'unavailable for free'
Who it’s for: Terminal-first developers who want an open-source pair programmer that works with any model, including free ones.
Cline
3/3 headless CLI runs fixed our seeded cart bug (4/4 tests pass) in 24-35s with a free OpenRouter model, without editing the test file.CLI, free model
- Headless CLI with a -y mode ran start to finish with no prompts
- Fixed the seeded bug in 3 of 3 runs and never touched the test file
- Works with free OpenRouter models, so our test cost $0
- Slower than Aider on the same model (24-35s vs 9-13s)
- Warns on Node versions below 22.15
- The -k flag saves your API key into the config directory
Who it’s for: Developers who like Cline in VS Code and want the same agent in a terminal or CI, with any model.
Verdict
Scores use rubric v0.1 from separate runs. Editions and tasks can differ (see Edition tested and What our tests found); some tests were a single run, which caps reliability scores. Overall: Aider 9.3, Cline 9.2. Check the free-tier limits above against your project before choosing.
FAQ
Which is better, Aider or Cline?
In our tests Aider scored higher overall (9.3/10 vs 9.2/10). Scores use the same rubric (v0.1) but came from separate runs; editions and tasks may differ (see Edition tested and test summaries), so check the per-dimension scores for what matters to you.
Is Aider free?
Yes: free tool, BYO API key or local models (pricing checked 2026-10-16).
Is Cline free?
Yes: free for individuals, pay inference only (pricing checked 2026-10-16).
How much does Aider cost compared with Cline?
Aider: Free open source (Apache 2.0); pay your LLM provider. Cline: Extension free; Teams $20/user/mo (first 10 seats free); Enterprise custom.
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Scores come from our own tests and are never for sale; sponsored placements are always labelled. Some links are affiliate links (currently Railway). Disclosure