head to head · open source
AstrBot vs sim
AstrBot has 45,879 GitHub stars, 3,368 forks, 1,516 open issues and last shipped 2 days ago. sim has 29,983 stars, 3,883 forks, 336 open issues and last shipped yesterday. AstrBot leads on adoption by 53% (45,879 vs 29,983 stars). AstrBot is written in Python under AGPL-3.0; sim is written in TypeScript under Apache-2.0. AstrBot has attracted 7% 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, chatbot, 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
| AstrBot | sim | |
|---|---|---|
| GitHub stars | ★ 46K | ★ 30K |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-11-03 | 2026-11-04 |
| Forks | ⑂ 3.4K | ⑂ 3.9K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick AstrBot if
- You weight community size — 46K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches Python
- 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 AstrBot
简体中文 ｜ 繁體中文 ｜ 日本語 ｜ Français ｜ Español ｜ Русский Documentation ｜ Blog ｜ Roadmap ｜ Issue Tracker ｜ Email Support AstrBot is an open source all in one Agent chatbot platform that integrates with mainstream instant messaging apps. It provides reliable and scalable conversational AI infrastructure for individuals, developers, and teams. Whether you're building a personal AI companion, intelligent customer service, automation assistant, or enterprise knowledge base, AstrBot enables you to quickly build production ready AI applications within your IM platform workflows. Key Features 1. 💯 Free & Open Source. 2. ✨ AI…
read the full AstrBot 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 AstrBot or sim more popular?
AstrBot has 45,879 GitHub stars and sim has 29,983. AstrBot has the larger community by that measure.
Are AstrBot and sim free?
Both are open source. AstrBot is licensed under AGPL-3.0 and sim under Apache-2.0. Neither carries a licence fee.
What is the difference between AstrBot and sim?
AstrBot is written in Python 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, AstrBot or sim?
Choose AstrBot if you want the larger community (45,879 stars) or its AGPL-3.0 licence terms. Choose sim if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.