head to head · open source
Hermes Agent vs sim
Hermes Agent has 246,492 GitHub stars, 51,615 forks, 41,784 open issues and last shipped yesterday. sim has 29,655 stars, 3,837 forks, 336 open issues and last shipped yesterday. Hermes Agent leads on adoption by 731% (246,492 vs 29,655 stars). Hermes Agent is written in Python under MIT; sim is written in TypeScript under Apache-2.0. Hermes Agent 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 2 topic tags (ai, anthropic), 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
| Hermes Agent | sim | |
|---|---|---|
| GitHub stars | ★ 246K | ★ 30K |
| License | MIT | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 52K | ⑂ 3.8K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Hermes Agent if
- You weight community size — 246K stars and counting
- You want the MIT 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 Hermes Agent
Hermes Agent is a desktop AI agent developed by Nous Research that maintains persistent memory and self improving capabilities across sessions and platforms. It operates as a local first, cross platform interface for LLMs, integrating with multiple model providers and deployment environments without vendor lock in. The agent implements a closed learning loop where it curates its own memory, creates and refines skills from experience, and supports cross session recall via full text search and summarization.
read the full Hermes Agent overview →
About sim
Sim is an open source collaborative workspace for building, deploying, and monitoring AI agents and workflows. It lives in the TypeScript ecosystem and is distributed under the Apache 2.0 license, with a repository that has accumulated roughly 29,600 stars and 3,800 forks over its two year history. The project positions itself as a single surface where chat, workflows, tables, files, and knowledge coexist, whether accessed through a browser or a desktop application for macOS.
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Frequently asked questions
Is Hermes Agent or sim more popular?
Hermes Agent has 246,492 GitHub stars and sim has 29,655. Hermes Agent has the larger community by that measure.
Are Hermes Agent and sim free?
Both are open source. Hermes Agent is licensed under MIT and sim under Apache-2.0. Neither carries a licence fee.
What is the difference between Hermes Agent and sim?
Hermes Agent 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, Hermes Agent or sim?
Choose Hermes Agent if you want the larger community (246,492 stars) or its MIT licence terms. Choose sim if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.