head to head · open source
prettier vs Aider
prettier has 52,405 GitHub stars, 5,023 forks, 1,462 open issues and last shipped yesterday. Aider has 49,910 stars, 5,128 forks, 1,860 open issues and last shipped 6 months ago. prettier leads on adoption by 5% (52,405 vs 49,910 stars). prettier is written in JavaScript under MIT; Aider is written in Python under Apache-2.0. prettier has attracted 10% as many forks as stars, Aider 10%. prettier 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
| prettier | Aider | |
|---|---|---|
| GitHub stars | ★ 52K | ★ 50K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Python |
| Last push | 2026-11-02 | 2026-05-22 |
| Forks | ⑂ 5.0K | ⑂ 5.1K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick prettier if
- You weight community size — 52K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- 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 prettier
Opinionated Code Formatter JavaScript · TypeScript · Flow · JSX · JSON CSS · SCSS · Less HTML · Vue · Angular GraphQL · Markdown · YAML Your favorite language? Intro Prettier is an opinionated code formatter. It enforces a consistent style by parsing your code and re printing it with its own rules that take the maximum line length into account, wrapping code when necessary. Input Output Prettier can be run in your editor on save, in a pre commit hook, or in CI environments to ensure your codebase has a consistent style without devs ever having to post a nit picky comment on a code review ever again!…
read the full prettier overview →
About Aider
AI Pair Programming in Your Terminal Aider lets you pair program with LLMs to start a new project or build on your existing codebase. Features Cloud and local LLMs Aider works best with Claude 3.7 Sonnet, DeepSeek R1 & Chat V3, OpenAI o1, o3 mini & GPT 4o, but can connect to almost any LLM, including local models. Maps your codebase Aider makes a map of your entire codebase, which helps it work well in larger projects. 100+ code languages Aider works with most popular programming languages: python, javascript, rust, ruby, go, cpp, php, html, css, and dozens more. Git integration Aider automatically commits…
read the full Aider overview →
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Frequently asked questions
Is prettier or Aider more popular?
prettier has 52,405 GitHub stars and Aider has 49,910. prettier has the larger community by that measure.
Are prettier and Aider free?
Both are open source. prettier is licensed under MIT and Aider under Apache-2.0. Neither carries a licence fee.
What is the difference between prettier and Aider?
prettier is written in JavaScript 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, prettier or Aider?
Choose prettier if you want the larger community (52,405 stars) or its MIT licence terms. Choose Aider if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.