head to head · open source
opcode vs haskell-language-server
opcode has 22,427 GitHub stars, 1,712 forks, 332 open issues and last shipped 17 days ago. haskell-language-server has 2,959 stars, 458 forks, 567 open issues and last shipped 5 days ago. opcode leads on adoption by 658% (22,427 vs 2,959 stars). opcode is written in TypeScript under AGPL-3.0; haskell-language-server is written in Haskell under Apache-2.0. opcode has attracted 8% as many forks as stars, haskell-language-server 15%. haskell-language-server 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 | haskell-language-server | |
|---|---|---|
| GitHub stars | ★ 22K | ★ 3.0K |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | TypeScript | Haskell |
| Last push | 2026-09-18 | 2026-09-30 |
| Forks | ⑂ 1.7K | ⑂ 458 |
| 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 haskell-language-server if
- You want the haskell-language-server feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Haskell
- You evaluated both and haskell-language-server 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 haskell-language-server
haskell language server is the official Haskell language server, an LSP implementation that gives any editor with an LSP client full IDE support for Haskell projects.
read the full haskell-language-server overview →
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Frequently asked questions
Is opcode or haskell-language-server more popular?
opcode has 22,427 GitHub stars and haskell-language-server has 2,959. opcode has the larger community by that measure.
Are opcode and haskell-language-server free?
Both are open source. opcode is licensed under AGPL-3.0 and haskell-language-server under Apache-2.0. Neither carries a licence fee.
What is the difference between opcode and haskell-language-server?
opcode is written in TypeScript and haskell-language-server in Haskell. 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 haskell-language-server?
Choose opcode if you want the larger community (22,427 stars) or its AGPL-3.0 licence terms. Choose haskell-language-server if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.