--- title: "mobilegym vs LLMs-from-scratch" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/purewhiter-mobilegym-vs-rasbt-llms-from-scratch" tools: ["purewhiter-mobilegym", "rasbt-llms-from-scratch"] --- # mobilegym vs LLMs-from-scratch *GraphCanon updated Jul 15, 2026* ## Verdict Pick mobilegym when mobilegym is primarily Python; LLMs-from-scratch is Jupyter Notebook; pick LLMs-from-scratch when lLMs-from-scratch is primarily Jupyter Notebook; mobilegym is Python. [mobilegym](https://mobilegym.dev) reports 721 GitHub stars, 116 forks, and 5 open issues, last pushed Jul 1, 2026. [LLMs-from-scratch](https://amzn.to/4fqvn0D) has 99k stars, 15k forks, and 4 open issues, last pushed Jun 2, 2026. Figures are from public GitHub metadata via [mobilegym's repository](https://github.com/Purewhiter/mobilegym) and [LLMs-from-scratch's repository](https://github.com/rasbt/LLMs-from-scratch). | | [mobilegym](/tools/purewhiter-mobilegym.md) | [LLMs-from-scratch](/tools/rasbt-llms-from-scratch.md) | | --- | --- | --- | | Tagline | MobileGym: A Verifiable and Highly Parallel Simulation Platform for Mobile GUI Agent Research · 浏览器里运行的安卓模拟器 · Browser-hosted Android Simulator · Verifiable Evaluation · Scalable Online RL Training | Implement a ChatGPT-like LLM in PyTorch from scratch, step by step | | Stars | 721 | 98,899 | | Forks | 116 | 15,183 | | Open issues | 5 | 4 | | Language | Python | Jupyter Notebook | | Adopt for | - | LLMs-from-scratch is a project-oriented repository aimed at building PyTorch-based language models from the ground up, with detailed step-by-step instructions. | | Persona | - | - | | Runtime | - | - | | License | Apache-2.0 | Other | | Categories | AI Agents, LLM Frameworks, Model Training | LLM Frameworks, Model Training | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [mobilegym](/tools/purewhiter-mobilegym.md) | [LLMs-from-scratch](/tools/rasbt-llms-from-scratch.md) | | --- | --- | --- | | Maintenance | Active (82%) | Steady (60%) | | Days since push | 14d | 38d | | Open issues (now) | 5 | 4 | | Full report | [trust report](/tools/purewhiter-mobilegym/trust.md) | [trust report](/tools/rasbt-llms-from-scratch/trust.md) | ## Decision facts: LLMs-from-scratch - **Adopt for:** LLMs-from-scratch is a project-oriented repository aimed at building PyTorch-based language models from the ground up, with detailed step-by-step instructions. ## Choose when ### Choose mobilegym if… - mobilegym is primarily Python; LLMs-from-scratch is Jupyter Notebook. - License: mobilegym is Apache-2.0, LLMs-from-scratch is Other. - Tags unique to mobilegym: agent, agents, android, automation. - Also covers AI Agents. ### Choose LLMs-from-scratch if… - LLMs-from-scratch is primarily Jupyter Notebook; mobilegym is Python. - License: LLMs-from-scratch is Other, mobilegym is Apache-2.0. - Tags unique to LLMs-from-scratch: artificial-intelligence, attention-mechanism, deep-learning, finetuning. - - You are an advanced practitioner aiming to fully understand the underpinnings of LLMs using PyTorch as your primary framework. ## When NOT to use mobilegym - AI Agents: Don't use an agent loop when a deterministic workflow would do; agents add latency, cost, and non-determinism. - LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves. - Model Training: Try prompting and RAG first; fine-tuning is the answer to style/format, not missing knowledge. ## When NOT to use LLMs-from-scratch - - If you are looking for a rapid deployment of an LLM without understanding its intricate structure - this tool requires extensive manual and conceptual work. - - You prefer frameworks with automatic model generation or other high-level abstractions that simplify the process. This repository emphasizes manual creation, which is more time-consuming but offers - a deeper learning experience. ## Common questions ### What is the difference between mobilegym and LLMs-from-scratch? mobilegym: MobileGym: A Verifiable and Highly Parallel Simulation Platform for Mobile GUI Agent Research · 浏览器里运行的安卓模拟器 · Browser-hosted Android Simulator · Verifiable Evaluation · Scalable Online RL Training. LLMs-from-scratch: Implement a ChatGPT-like LLM in PyTorch from scratch, step by step. See the comparison table for live GitHub stats and shared categories. ### When should I choose mobilegym over LLMs-from-scratch? Choose mobilegym over LLMs-from-scratch when mobilegym is primarily Python; LLMs-from-scratch is Jupyter Notebook; License: mobilegym is Apache-2.0, LLMs-from-scratch is Other; Tags unique to mobilegym: agent, agents, android, automation; Also covers AI Agents. ### When should I choose LLMs-from-scratch over mobilegym? Choose LLMs-from-scratch over mobilegym when LLMs-from-scratch is primarily Jupyter Notebook; mobilegym is Python; License: LLMs-from-scratch is Other, mobilegym is Apache-2.0; Tags unique to LLMs-from-scratch: artificial-intelligence, attention-mechanism, deep-learning, finetuning; - You are an advanced practitioner aiming to fully understand the underpinnings of LLMs using PyTorch as your primary framework. ### When should I avoid mobilegym? AI Agents: Don't use an agent loop when a deterministic workflow would do; agents add latency, cost, and non-determinism. LLM Frameworks: Avoid a framework for a single prompt-and-retrieve call; the abstraction can cost more than it saves. Model Training: Try prompting and RAG first; fine-tuning is the answer to style/format, not missing knowledge. ### When should I avoid LLMs-from-scratch? - If you are looking for a rapid deployment of an LLM without understanding its intricate structure - this tool requires extensive manual and conceptual work. - You prefer frameworks with automatic model generation or other high-level abstractions that simplify the process. This repository emphasizes manual creation, which is more time-consuming but offers a deeper learning experience. ### Is mobilegym or LLMs-from-scratch more popular on GitHub? LLMs-from-scratch has more GitHub stars (98,899 vs 721). Stars measure visibility, not whether either tool fits your constraints. ### Are mobilegym and LLMs-from-scratch open source? Yes - both are open-source projects on GitHub (mobilegym: Apache-2.0, LLMs-from-scratch: Other). ### Where can I find alternatives to mobilegym or LLMs-from-scratch? GraphCanon lists graph-backed alternatives at [mobilegym alternatives](/tools/purewhiter-mobilegym/alternatives) and [LLMs-from-scratch alternatives](/tools/rasbt-llms-from-scratch/alternatives) ([mobilegym markdown twin](/tools/purewhiter-mobilegym/alternatives.md), [LLMs-from-scratch markdown twin](/tools/rasbt-llms-from-scratch/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/purewhiter-mobilegym-vs-rasbt-llms-from-scratch.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, mobilegym or LLMs-from-scratch? mobilegym: Active. LLMs-from-scratch: Steady. 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 mobilegym and LLMs-from-scratch? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [mobilegym trust report](/tools/purewhiter-mobilegym/trust); [LLMs-from-scratch trust report](/tools/rasbt-llms-from-scratch/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=purewhiter-mobilegym`](/api/graphcanon/graph?tool=purewhiter-mobilegym) - 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/_