head to head · open source
LobeChat vs sim
LobeChat has 83,716 GitHub stars, 16,033 forks, 922 open issues and last shipped yesterday. sim has 29,974 stars, 3,879 forks, 336 open issues and last shipped yesterday. LobeChat leads on adoption by 179% (83,716 vs 29,974 stars). LobeChat is written in TypeScript under a custom or non-standard licence; sim is written in TypeScript under Apache-2.0. LobeChat has attracted 19% 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 3 topic tags (ai, 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
| LobeChat | sim | |
|---|---|---|
| GitHub stars | ★ 84K | ★ 30K |
| License | Custom / other | Apache-2.0 |
| Written in | TypeScript | TypeScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 16K | ⑂ 3.9K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick LobeChat if
- You weight community size — 84K stars and counting
- You want the Custom / other 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 LobeChat
[![][image banner]][vercel link] LobeHub LobeHub organizes your agents into 7×24 operation. It hires, schedules, reports on your entire AI team. You stay in charge — without staying online. English · 简体中文 · [Official Site][official site] · [Changelog][changelog] · [Documents][docs] · [Blog][blog] · [Feedback][github issues link] [![][github release shield]][github release link] [![][docker release shield]][docker release link] [![][vercel shield]][vercel link] [![][discord shield]][discord link] [![][codecov shield]][codecov link] [![][github action test shield]][github action test link] [![][github action…
read the full LobeChat 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 LobeChat or sim more popular?
LobeChat has 83,716 GitHub stars and sim has 29,974. LobeChat has the larger community by that measure.
Are LobeChat and sim free?
Both are open source. LobeChat has no licence declared in this registry, and sim is licensed under Apache-2.0. Both are free to self-host.
What is the difference between LobeChat and sim?
LobeChat 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, LobeChat or sim?
Choose LobeChat if you want the larger community (83,716 stars) or its Custom / other licence terms. Choose sim if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.