--- title: "mastra vs modelfusion" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/mastra-ai-mastra-vs-vercel-modelfusion" tools: ["mastra-ai-mastra", "vercel-modelfusion"] --- # mastra vs modelfusion *GraphCanon updated Aug 16, 2026* ## Verdict Pick mastra if mastra is a modern TypeScript framework tailored specifically for building AI-powered applications and agents, supporting technologies like chatbots, language models, and TTS; pick modelfusion if a TypeScript library for AI applications, supports diverse models. [mastra](https://mastra.ai) reports 27k GitHub stars, 2.6k forks, and 469 open issues, last pushed Aug 16, 2026. [modelfusion](https://modelfusion.dev) has 1.3k stars, 95 forks, and 42 open issues, last pushed Jul 19, 2024. Figures are from public GitHub metadata via [mastra's repository](https://github.com/mastra-ai/mastra) and [modelfusion's repository](https://github.com/vercel/modelfusion). | | [mastra](/tools/mastra-ai-mastra.md) | [modelfusion](/tools/vercel-modelfusion.md) | | --- | --- | --- | | Tagline | Modern TypeScript framework for AI-powered applications and agents | TypeScript library for building AI applications | | Stars | 27,229 | 1,319 | | Forks | 2,642 | 95 | | Open issues | 469 | 42 | | Language | TypeScript | TypeScript | | Adopt for | Mastra is a modern TypeScript framework tailored specifically for building AI-powered applications and agents, supporting technologies like chatbots, language models, and TTS. | A TypeScript library for AI applications, supports diverse models. | | Persona | - | - | | Runtime | - | - | | License | Mastra operates under a dual-license model with its core components licensed under Apache-2.0 and enterprise-exclusive features under the proprietary Mastra Enterprise License. | MIT | | Categories | AI Agents, Evaluation & Observability, LLM Frameworks, Speech & Audio | Developer Tools, LLM Frameworks | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [mastra](/tools/mastra-ai-mastra.md) | [modelfusion](/tools/vercel-modelfusion.md) | | --- | --- | --- | | Maintenance | Very active (96%) | Archived (8%) | | Days since push | 0d | 757d | | Archived on GitHub | No | Yes | | Open issues (now) | 469 | 42 | | Stars delta | +954 (30d) | +1 (30d) | | Open issues delta | +66 (30d) | 0 (30d) | | Full report | [trust report](/tools/mastra-ai-mastra/trust.md) | [trust report](/tools/vercel-modelfusion/trust.md) | ## Decision facts: mastra - **Pricing:** freemium - Free for open-source Apache-licensed portions; Mastra Enterprise License subscription required for full feature access. - **Requirements:** Project must be developed in TypeScript.; JavaScript and TypeScript ecosystems (Node.js, NextJS) are prerequisites for leveraging Mastra's integrations fully. - **Adopt for:** Mastra is a modern TypeScript framework tailored specifically for building AI-powered applications and agents, supporting technologies like chatbots, language models, and TTS. - **License detail:** Mastra operates under a dual-license model with its core components licensed under Apache-2.0 and enterprise-exclusive features under the proprietary Mastra Enterprise License. ## Decision facts: modelfusion - **Adopt for:** A TypeScript library for AI applications, supports diverse models. ## Choose when ### Choose mastra if… - License: mastra is Other, modelfusion is MIT. - Pricing: Free for open-source Apache-licensed portions; Mastra Enterprise License subscription required for full feature access.. - Requirements: Project must be developed in TypeScript.; JavaScript and TypeScript ecosystems (Node.js, NextJS) are prerequisites for leveraging Mastra's integrations fully.. - Tags unique to mastra: agents, chatbots, evals, javascript. - Also covers AI Agents, Evaluation & Observability, Speech & Audio. - You should use Mastra when you are developing AI-driven applications or bots that require integration with technologies such as text-to-speech (TTS) or complex chatbot functionalities. ### Choose modelfusion if… - License: modelfusion is MIT, mastra is Other. - Tags unique to modelfusion: artificial-intelligence, chatbot, claude, dall-e. - Also covers Developer Tools. - You prioritize TypeScript in development and require support for multiple LLMs. ## When NOT to use mastra - Mastra may not be suitable if your application does not require TypeScript and prefers simpler setup or non-TypeScript environments. - Avoid using Mastra if enterprise-level features or a dual-license model do not align with your project’s requirements or budget, especially when cost-free, fully open-source alternatives exist that - If you are working on smaller projects where the overhead of a comprehensive framework like Mastra overwhelms the available resources or the scope of work is minimal, consider lighter-weight solutions ## When NOT to use modelfusion - If your preference leans towards languages other than TypeScript for AI projects. - For projects that demand a library strictly limited to one type of LLM framework. ## Common questions ### What is the difference between mastra and modelfusion? mastra: Modern TypeScript framework for AI-powered applications and agents. modelfusion: TypeScript library for building AI applications. See the comparison table for live GitHub stats and shared categories. ### When should I choose mastra over modelfusion? Choose mastra over modelfusion when License: mastra is Other, modelfusion is MIT; Pricing: Free for open-source Apache-licensed portions; Mastra Enterprise License subscription required for full feature access.; Requirements: Project must be developed in TypeScript.; JavaScript and TypeScript ecosystems (Node.js, NextJS) are prerequisites for leveraging Mastra's integrations fully.; Tags unique to mastra: agents, chatbots, evals, javascript; Also covers AI Agents, Evaluation & Observability, Speech & Audio; You should use Mastra when you are developing AI-driven applications or bots that require integration with technologies such as text-to-speech (TTS) or complex chatbot functionalities. ### When should I choose modelfusion over mastra? Choose modelfusion over mastra when License: modelfusion is MIT, mastra is Other; Tags unique to modelfusion: artificial-intelligence, chatbot, claude, dall-e; Also covers Developer Tools; You prioritize TypeScript in development and require support for multiple LLMs. ### When should I avoid mastra? Mastra may not be suitable if your application does not require TypeScript and prefers simpler setup or non-TypeScript environments. Avoid using Mastra if enterprise-level features or a dual-license model do not align with your project’s requirements or budget, especially when cost-free, fully open-source alternatives exist that If you are working on smaller projects where the overhead of a comprehensive framework like Mastra overwhelms the available resources or the scope of work is minimal, consider lighter-weight solutions ### When should I avoid modelfusion? If your preference leans towards languages other than TypeScript for AI projects. For projects that demand a library strictly limited to one type of LLM framework. ### Is mastra or modelfusion more popular on GitHub? mastra has more GitHub stars (27,229 vs 1,319). Stars measure visibility, not whether either tool fits your constraints. ### Are mastra and modelfusion open source? Yes - both are open-source projects on GitHub (mastra: Other, modelfusion: MIT). ### Where can I find alternatives to mastra or modelfusion? GraphCanon lists graph-backed alternatives at [mastra alternatives](/tools/mastra-ai-mastra/alternatives) and [modelfusion alternatives](/tools/vercel-modelfusion/alternatives) ([mastra markdown twin](/tools/mastra-ai-mastra/alternatives.md), [modelfusion markdown twin](/tools/vercel-modelfusion/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/mastra-ai-mastra-vs-vercel-modelfusion.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, mastra or modelfusion? mastra: Very active. modelfusion: Archived. 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 mastra and modelfusion? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [mastra trust report](/tools/mastra-ai-mastra/trust); [modelfusion trust report](/tools/vercel-modelfusion/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=mastra-ai-mastra`](/api/graphcanon/graph?tool=mastra-ai-mastra) - 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/_