head to head · open source
Aider vs T3 Code
Aider has 49,021 GitHub stars, 4,967 forks, 1,860 open issues and last shipped 4 months ago. T3 Code has 22,945 stars, 5,817 forks, 1,628 open issues and last shipped yesterday. Aider leads on adoption by 114% (49,021 vs 22,945 stars). Aider is written in Python under Apache-2.0; T3 Code is written in TypeScript under MIT. Aider has attracted 10% as many forks as stars, T3 Code 25%. T3 Code was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| Aider | T3 Code | |
|---|---|---|
| GitHub stars | ★ 49K | ★ 23K |
| License | Apache-2.0 | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-05-22 | 2026-09-17 |
| Forks | ⑂ 5.0K | ⑂ 5.8K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Aider if
- You weight community size — 49K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick T3 Code if
- You want the T3 Code feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and T3 Code fits your workflow better
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 →
About T3 Code
T3 Code is an open source agent harness control surface for AI assisted coding. It lives in the developer tools ecosystem for local coding agents, and it gives users one interface for agents that are already installed and authenticated on their own computer. The project is written in TypeScript and is MIT licensed.
read the full T3 Code overview →
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Frequently asked questions
Is Aider or T3 Code more popular?
Aider has 49,021 GitHub stars and T3 Code has 22,945. Aider has the larger community by that measure.
Are Aider and T3 Code free?
Both are open source. Aider is licensed under Apache-2.0 and T3 Code under MIT. Neither carries a licence fee.
What is the difference between Aider and T3 Code?
Aider is written in Python and T3 Code in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Aider or T3 Code?
Choose Aider if you want the larger community (49,021 stars) or its Apache-2.0 licence terms. Choose T3 Code if its feature set, stack or MIT licence fits better. Both are self-hostable.