head to head · open source
Tailcall vs optillm
Tailcall has 7,633 GitHub stars, 1,456 forks, 45 open issues and last shipped 2 days ago. optillm has 4,335 stars, 398 forks, 23 open issues and last shipped 3 days ago. Tailcall leads on adoption by 76% (7,633 vs 4,335 stars). Tailcall is written in Rust under Apache-2.0; optillm is written in Python under Apache-2.0. Tailcall has attracted 19% as many forks as stars, optillm 9%. Tailcall was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (llm), 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.
← all 20902 open source comparisons
Side by side
| Tailcall | optillm | |
|---|---|---|
| GitHub stars | ★ 7.6K | ★ 4.3K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Rust | Python |
| Last push | 2026-11-03 | 2026-11-02 |
| Forks | ⑂ 1.5K | ⑂ 398 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Tailcall if
- You weight community size — 7.6K 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 optillm if
- You want the optillm 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 optillm fits your workflow better
About Tailcall
⚒️ Forge: AI Enhanced Terminal Development Environment A comprehensive coding agent that integrates AI capabilities with your development environment curl fsSL sh Table of Contents Quickstart Usage Examples Why Forge? How Forge Works: Three Modes Interactive Mode (TUI) One Shot CLI Mode ZSH Plugin Mode ( : prefix) ZSH Plugin: The : Prefix System Agents Sending Prompts Attaching Files Conversation Management Git Integration Shell Command Tools Session & Configuration Skills Customizing Agent Behavior Semantic Search (Workspace) Quick Reference: All : Commands Command Line Options Advanced Configuration Provider…
read the full Tailcall overview →
About optillm
OptiLLM 🚀 2 10x accuracy improvements on reasoning tasks with zero training 🤗 HuggingFace Space • 📓 Colab Demo • 💬 Discussions OptiLLM is an OpenAI API compatible optimizing inference proxy that implements 20+ state of the art techniques to dramatically improve LLM accuracy and performance on reasoning tasks without requiring any model training or fine tuning. It is possible to beat the frontier models using these techniques across diverse tasks by doing additional compute at inference time. A good example of how to combine such techniques together is the CePO approach from Cerebras. ✨ Key Features 🎯…
read the full optillm overview →
More in Developer Tools
Related comparisons
More API Development & Testing projects
Compare either of these against the rest of the API Development & Testing field.
Frequently asked questions
Is Tailcall or optillm more popular?
Tailcall has 7,633 GitHub stars and optillm has 4,335. Tailcall has the larger community by that measure.
Are Tailcall and optillm free?
Both are open source. Tailcall is licensed under Apache-2.0 and optillm under Apache-2.0. Neither carries a licence fee.
What is the difference between Tailcall and optillm?
Tailcall is written in Rust and optillm 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, Tailcall or optillm?
Choose Tailcall if you want the larger community (7,633 stars) or its Apache-2.0 licence terms. Choose optillm if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.