Aider

#4 in Coding Agents

Verdict: Open-source pair programmer in your terminal.

Best for: Open-source, git-native workflow

Pricing: Free, open source (Apache-2.0); pay for your own LLM API

License: https://github.com/Aider-AI/aider/blob/main/LICENSE.txt

Last checked: 2026-10-16

Hands-on tested: 2026-10-16: Standard /health task on a fresh minimal Express app with model gemini-3.5-flash (Gemini API free tier), aider 0.86.2: finished with no manual fixes, 0 interventions, test passed (jest 1/1), ~6 s. Prompt also named jest/supertest and the test file.

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