Gemini CLI vs Aider: what developers actually say
Based on 245 opinions on Hacker News from developers who discussed these two, most of them first-hand users.
Aider comes out ahead on the opinion data: approval of 60 from 34 opinions against 29 from 211 for Gemini CLI, and stronger code-quality marks (5 positive, 1 negative versus 6 and 17). The only explicit head-to-head pick went to Aider, from someone working in a Go codebase with thousands of files. Gemini CLI has far more discussion and a 25 approval over the last 90 days, but reliability is its clear weak point (7 positive, 55 negative) and 32 users said they preferred Claude Code instead. Aider's sample is small and has no 90-day figure, so read its lead as directional rather than settled.
When developers explicitly said they prefer one or switched: 0 picked Gemini CLI, 1 picked Aider.
Choose Gemini CLI if
- Want the option with far more discussion (211 opinions)
- Need a Google-backed tool with a current 90-day approval figure
- Accept weak reliability scores in exchange for a larger feedback base
Choose Aider if
- Work in a large codebase with thousands of files
- Want higher approval and code-quality marks
- Prefer manual file control and an open-source tool that keeps data local
Where each one wins and loses
Why developers switched
Picked Gemini CLI
No explicit switches recorded.
Picked Aider
Summaries are paraphrased. Each links to the original comment.