Compare AI tools

	Aider A	Claude Code S	Gemini A	NotebookLM S
Tagline	Terminal-based AI pair programmer. Git-aware, model-flexible.	Anthropic's CLI agent. Opus-powered, operates on your repo directly.	Google's answer. Best integrated with Workspace + free for a lot.	Google's research notebook. Turns your docs into a podcast.
Category	coding	coding	chat	research
Pricing	Free (open source) + whatever API you use	Part of Claude Pro/Max/Team plans	Free + $20/mo Advanced (bundled with 2TB Drive)	Free
Best for	Developers who want open-source tooling with full control.	Developers who want an agent, not autocomplete. Large refactors, tests, docs.	Anyone already on Google, research tasks, summarizing long documents.	Students, researchers, anyone with a stack of PDFs or a topic to learn.
Strengths	Works in any terminal Auto-commits changes with meaningful messages Works with any model (Claude, GPT, local) Minimal learning curve	Runs locally, edits your actual files Strong on large codebases with 1M context Great at multi-step tasks	Native Google Workspace integration Very long context (1M+) Deep Research feature Free tier is generous	Upload anything, ask questions, get cited answers Audio Overview turns docs into a 10-min podcast Great for studying
Weaknesses	Terminal-only Less agentic than Claude Code Setup on Windows is fiddly	Terminal-based — learning curve Can't be used without Claude subscription	Writing quality trails Claude Over-refusals on edge content UI is cluttered	Google-only Can be slow on large corpora
Kai's verdict	A-tier. The right answer if you want open-source + terminal-native + model-agnostic.	S-tier if you live in the terminal. Different shape than Cursor — complementary, not replacement.	A-tier. The Deep Research feature is genuinely useful. Don't sleep on it if you're already paying Google.	S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.
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