head to head · open source
Hermes Agent vs sim
Hermes Agent has 259,804 GitHub stars, 57,202 forks, 41,784 open issues and last shipped yesterday. sim has 29,974 stars, 3,879 forks, 336 open issues and last shipped yesterday. Hermes Agent leads on adoption by 767% (259,804 vs 29,974 stars). Hermes Agent is written in Python under MIT; sim is written in TypeScript under Apache-2.0. Hermes Agent has attracted 22% 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 | ★ 260K | ★ 30K |
| License | MIT | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 57K | ⑂ 3.9K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Hermes Agent if
- You weight community size — 260K 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 ☤ Hermes Agent Hermes Desktop The self improving AI agent built by Nous Research. It's the only agent with a built in learning loop — it creates skills from experience, improves them during use, nudges itself to persist knowledge, searches its own past conversations, and builds a deepening model of who you are across sessions. Run it on a $5 VPS, a GPU cluster, or serverless infrastructure that costs nearly nothing when idle. It's not tied to your laptop — talk to it from Telegram while it works on a cloud VM. Use any model you want — Nous Portal, OpenRouter, OpenAI, your own endpoint, and many…
read the full Hermes Agent 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 Hermes Agent or sim more popular?
Hermes Agent has 259,804 GitHub stars and sim has 29,974. 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 (259,804 stars) or its MIT licence terms. Choose sim if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.