head to head · open source
rtk vs Aider
rtk has 80,883 GitHub stars, 5,130 forks, 1,642 open issues and last shipped yesterday. Aider has 49,030 stars, 4,972 forks, 1,860 open issues and last shipped 4 months ago. rtk leads on adoption by 65% (80,883 vs 49,030 stars). rtk is written in Rust under Apache-2.0; Aider is written in Python under Apache-2.0. rtk has attracted 6% as many forks as stars, Aider 10%. rtk was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (anthropic, cli), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| rtk | Aider | |
|---|---|---|
| GitHub stars | ★ 81K | ★ 49K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Rust | Python |
| Last push | 2026-09-18 | 2026-05-22 |
| Forks | ⑂ 5.1K | ⑂ 5.0K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick rtk if
- You weight community size — 81K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Rust
- You value the larger contributor base for long-term maintenance
pick Aider if
- You want the Aider feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and Aider fits your workflow better
About rtk
rtk is an Apache 2.0 Rust CLI proxy that sits between an AI coding agent and the shell, filtering and compressing command output so 60 90% fewer tokens reach the model, and it is built for developers running agentic coding tools such as Claude Code, Cursor, or Codex against real repositories.
About Aider
Aider is an open source AI pair programming tool that runs in the terminal. It connects to large language models—cloud based or local—to assist with writing, editing, and debugging code directly within a developer’s existing workflow. Built in Python and licensed under Apache 2.0, it integrates with popular LLMs including OpenAI, Anthropic, Google Gemini, and open source models like Llama.
read the full Aider overview →
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Frequently asked questions
Is rtk or Aider more popular?
rtk has 80,883 GitHub stars and Aider has 49,030. rtk has the larger community by that measure.
Are rtk and Aider free?
Both are open source. rtk is licensed under Apache-2.0 and Aider under Apache-2.0. Neither carries a licence fee.
What is the difference between rtk and Aider?
rtk is written in Rust and Aider in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, rtk or Aider?
Choose rtk if you want the larger community (80,883 stars) or its Apache-2.0 licence terms. Choose Aider if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.