head to head · open source
opcode vs pyrefly
opcode has 22,407 GitHub stars, 1,719 forks, 332 open issues and last shipped 9 days ago. pyrefly has 7,017 stars, 521 forks, 694 open issues and last shipped today. opcode leads on adoption by 219% (22,407 vs 7,017 stars). opcode is written in TypeScript under AGPL-3.0; pyrefly is written in Rust under MIT. opcode has attracted 8% as many forks as stars, pyrefly 7%. pyrefly was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (ide), 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
| opcode | pyrefly | |
|---|---|---|
| GitHub stars | ★ 22K | ★ 7.0K |
| License | AGPL-3.0 | MIT |
| Written in | TypeScript | Rust |
| Last push | 2026-09-18 | 2026-09-27 |
| Forks | ⑂ 1.7K | ⑂ 521 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick opcode if
- You weight community size — 22K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick pyrefly if
- You want the pyrefly feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Rust
- You evaluated both and pyrefly fits your workflow better
About opcode
opcode is an open source desktop GUI application and toolkit for Claude Code that provides a visual command centre for projects, sessions, custom agents, Model Context Protocol servers, checkpoints, and API usage, aimed at developers who already work with Claude Code from the command line and want a graphical layer over it.
read the full opcode overview →
About pyrefly
Pyrefly is a fast, MIT licensed type checker and language server for Python, written in Rust and distributed both as a command line tool and as extensions for editors such as VS Code, Neovim and Zed, aimed at Python developers and teams who want type checking and IDE features from a single tool.
read the full pyrefly overview →
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Frequently asked questions
Is opcode or pyrefly more popular?
opcode has 22,407 GitHub stars and pyrefly has 7,017. opcode has the larger community by that measure.
Are opcode and pyrefly free?
Both are open source. opcode is licensed under AGPL-3.0 and pyrefly under MIT. Neither carries a licence fee.
What is the difference between opcode and pyrefly?
opcode is written in TypeScript and pyrefly in Rust. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, opcode or pyrefly?
Choose opcode if you want the larger community (22,407 stars) or its AGPL-3.0 licence terms. Choose pyrefly if its feature set, stack or MIT licence fits better. Both are self-hostable.