head to head · open source
LibreChat vs sim
LibreChat has 46,705 GitHub stars, 9,610 forks, 732 open issues and last shipped yesterday. sim has 29,983 stars, 3,883 forks, 336 open issues and last shipped yesterday. LibreChat leads on adoption by 56% (46,705 vs 29,983 stars). LibreChat is written in TypeScript under MIT; sim is written in TypeScript under Apache-2.0. LibreChat has attracted 21% as many forks as stars, sim 13%. sim was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 4 topic tags (ai, anthropic, deepseek, gemini), 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
| LibreChat | sim | |
|---|---|---|
| GitHub stars | ★ 47K | ★ 30K |
| License | MIT | Apache-2.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-11-04 | 2026-11-04 |
| Forks | ⑂ 9.6K | ⑂ 3.9K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick LibreChat if
- You weight community size — 47K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick sim if
- You want the sim feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and sim fits your workflow better
About LibreChat
LibreChat English · 中文 🚀 What's New in v0.8.8 rc2 Agent run control: Interrupt an Agent before visible answer text, steer runs with files and quoted excerpts, durably queue follow ups, and recover saved partial work with Keep going or Answer now . Agent activity: Optional generated labels group reasoning and tool work, fold completed groups into live phase cards, keep generated files visible, summarize multi step phases, and show the current reasoning direction. Human in the loop Agents: Stream up to four related questions, pause for input or tool approval, and resume durably. Unified Agent Builder: Configure…
read the full LibreChat overview →
About sim
A workspace to build, deploy and manage AI agents and workflows. Quickstart Cloud hosted: sim.ai Self hosted Open Desktop: macOS macOS 12+, Apple Silicon and Intel. See the desktop docs to point it at a self hosted deployment. Capabilities Connect 1,000+ integrations and every major LLM Add Slack, Notion, HubSpot, Salesforce, databases, and more Build agents visually, conversationally, or with code Ingest files, knowledge bases, and structured table data Monitor runs, logs, schedules, and workflow activity One workspace, every surface Chat and workflows are just the start — tables, files, and knowledge all live…
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Frequently asked questions
Is LibreChat or sim more popular?
LibreChat has 46,705 GitHub stars and sim has 29,983. LibreChat has the larger community by that measure.
Are LibreChat and sim free?
Both are open source. LibreChat is licensed under MIT and sim under Apache-2.0. Neither carries a licence fee.
What is the difference between LibreChat and sim?
LibreChat is written in TypeScript and sim 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, LibreChat or sim?
Choose LibreChat if you want the larger community (46,705 stars) or its MIT licence terms. Choose sim if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.