--- title: "caveman vs mobilegym" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/juliusbrussee-caveman-vs-purewhiter-mobilegym" tools: ["juliusbrussee-caveman", "purewhiter-mobilegym"] --- # caveman vs mobilegym *GraphCanon updated Sep 20, 2026* ## Verdict Pick caveman if caveman reduces token usage by 65% through minimalistic language for coding agents, supporting two sizes and primarily written in Go; pick mobilegym if mobileGym specializes in browser-hosted Android simulation for reinforcing learning training of mobile GUI agents. It is licensed under Apache-2.0 and written in Python. [caveman](https://docs.caveman.so/docs/quickstart) reports 106k GitHub stars, 6.2k forks, and 127 open issues, last pushed Sep 18, 2026. [mobilegym](https://mobilegym.dev) has 795 stars, 136 forks, and 9 open issues, last pushed Aug 28, 2026. Figures are from public GitHub metadata via [caveman's repository](https://github.com/JuliusBrussee/caveman) and [mobilegym's repository](https://github.com/Purewhiter/mobilegym). | | [caveman](/tools/juliusbrussee-caveman.md) | [mobilegym](/tools/purewhiter-mobilegym.md) | | --- | --- | --- | | Tagline | Reduces token usage by 65% through minimalistic language for coding agents | Browser-hosted Android Simulator for Mobile GUI Agent Research | | Stars | 106,401 | 795 | | Forks | 6,165 | 136 | | Open issues | 127 | 9 | | Language | Go | Python | | Adopt for | Caveman reduces token usage by 65% through minimalistic language for coding agents, supporting two sizes and primarily written in Go. | MobileGym specializes in browser-hosted Android simulation for reinforcing learning training of mobile GUI agents. It is licensed under Apache-2.0 and written in Python. | | Persona | - | - | | Runtime | - | - | | License | Caveman operates under a split license: MIT for the skill, Agent SDK, and initializer, and BSL-1.1 for the engine-linked runtime, which converts to Apache-2.0 by 2030 or four years after shipping. | Apache-2.0 | | Categories | AI Agents, Model Training | AI Agents, Model Training | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [caveman](/tools/juliusbrussee-caveman.md) | [mobilegym](/tools/purewhiter-mobilegym.md) | | --- | --- | --- | | Maintenance | Very active (96%) | Active (82%) | | Days since push | 0d | 22d | | Open issues (now) | 127 | 9 | | Stars delta | +8.0k (30d) | +40 (30d) | | Open issues delta | -358 (30d) | +2 (30d) | | Full report | [trust report](/tools/juliusbrussee-caveman/trust.md) | [trust report](/tools/purewhiter-mobilegym/trust.md) | ## Decision facts: caveman - **Pricing:** freemium - The skill, Agent SDK, and initializer are free under MIT license. Hosting Caveman for third parties requires a commercial license. - **Requirements:** Min 1 GB RAM; Caveman is primarily written in Go and supports two sizes, allowing for flexible deployment. - **Adopt for:** Caveman reduces token usage by 65% through minimalistic language for coding agents, supporting two sizes and primarily written in Go. - **License detail:** Caveman operates under a split license: MIT for the skill, Agent SDK, and initializer, and BSL-1.1 for the engine-linked runtime, which converts to Apache-2.0 by 2030 or four years after shipping. ## Decision facts: mobilegym - **Adopt for:** MobileGym specializes in browser-hosted Android simulation for reinforcing learning training of mobile GUI agents. It is licensed under Apache-2.0 and written in Python. ## Choose when ### Choose caveman if… - caveman is primarily Go; mobilegym is Python. - License: caveman is Other, mobilegym is Apache-2.0. - Pricing: The skill, Agent SDK, and initializer are free under MIT license. Hosting Caveman for third parties requires a commercial license.. - Requirements: Min 1 GB RAM; Caveman is primarily written in Go and supports two sizes, allowing for flexible deployment.. - Tags unique to caveman: anthropic, caveman, claude, claude-code. - caveman ships Docker support for self-hosted deployment. - When you need to significantly reduce token usage in coding agents, as Caveman can cut usage by 65% through its simplified language style. ### Choose mobilegym if… - mobilegym is primarily Python; caveman is Go. - License: mobilegym is Apache-2.0, caveman is Other. - Tags unique to mobilegym: agent, android, automation, benchmark. - You require a browser-based solution to simulate Android environments for testing and training mobile graphical user interface (GUI) agents. ## When NOT to use caveman - If your project requires a fully OSI-approved open-source license, as Caveman's engine-linked runtime is BSL-1.1, which is not OSI-approved until a future date. - When you need a tool that does not involve a trademarked name and logo, as Caveman is trademarked and has specific guidelines for its use. ## When NOT to use mobilegym - Your project does not involve mobile GUI agent research or development; MobileGym's specialty is in this specific application and may not be useful for general-purpose simulation。 - You are looking for a solution that runs exclusively on local servers rather than browser-hosted environments. ## Common questions ### What is the difference between caveman and mobilegym? caveman: Reduces token usage by 65% through minimalistic language for coding agents. mobilegym: Browser-hosted Android Simulator for Mobile GUI Agent Research. See the comparison table for live GitHub stats and shared categories. ### When should I choose caveman over mobilegym? Choose caveman over mobilegym when caveman is primarily Go; mobilegym is Python; License: caveman is Other, mobilegym is Apache-2.0; Pricing: The skill, Agent SDK, and initializer are free under MIT license. Hosting Caveman for third parties requires a commercial license.; Requirements: Min 1 GB RAM; Caveman is primarily written in Go and supports two sizes, allowing for flexible deployment.; Tags unique to caveman: anthropic, caveman, claude, claude-code; caveman ships Docker support for self-hosted deployment; When you need to significantly reduce token usage in coding agents, as Caveman can cut usage by 65% through its simplified language style. ### When should I choose mobilegym over caveman? Choose mobilegym over caveman when mobilegym is primarily Python; caveman is Go; License: mobilegym is Apache-2.0, caveman is Other; Tags unique to mobilegym: agent, android, automation, benchmark; You require a browser-based solution to simulate Android environments for testing and training mobile graphical user interface (GUI) agents. ### When should I avoid caveman? If your project requires a fully OSI-approved open-source license, as Caveman's engine-linked runtime is BSL-1.1, which is not OSI-approved until a future date. When you need a tool that does not involve a trademarked name and logo, as Caveman is trademarked and has specific guidelines for its use. ### When should I avoid mobilegym? Your project does not involve mobile GUI agent research or development; MobileGym's specialty is in this specific application and may not be useful for general-purpose simulation。 You are looking for a solution that runs exclusively on local servers rather than browser-hosted environments. ### Is caveman or mobilegym more popular on GitHub? caveman has more GitHub stars (106,401 vs 795). Stars measure visibility, not whether either tool fits your constraints. ### Are caveman and mobilegym open source? Yes - both are open-source projects on GitHub (caveman: Other, mobilegym: Apache-2.0). ### Where can I find alternatives to caveman or mobilegym? GraphCanon lists graph-backed alternatives at [caveman alternatives](/tools/juliusbrussee-caveman/alternatives) and [mobilegym alternatives](/tools/purewhiter-mobilegym/alternatives) ([caveman markdown twin](/tools/juliusbrussee-caveman/alternatives.md), [mobilegym markdown twin](/tools/purewhiter-mobilegym/alternatives.md)), ranked by typed relationship edges rather than popularity votes. ### Is there a machine-readable version of this comparison? Yes. The markdown twin at [this comparison](/compare/juliusbrussee-caveman-vs-purewhiter-mobilegym.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, caveman or mobilegym? caveman: Very active. mobilegym: Active. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance. ### Where are the full trust reports for caveman and mobilegym? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [caveman trust report](/tools/juliusbrussee-caveman/trust); [mobilegym trust report](/tools/purewhiter-mobilegym/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=juliusbrussee-caveman`](/api/graphcanon/graph?tool=juliusbrussee-caveman) - LLM index: [/llms.txt](/llms.txt) - Full corpus: [/llms-full.txt](/llms-full.txt) _GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_