Google Agent Development Kit (ADK) is free, with no paid plan attached. Mastra is free, with no paid plan attached. Both are listed under Agent Frameworks (Developers), so this is a like-for-like comparison. Neither is ranked above the other — Flocci carries no sponsored placement.
Google Agent Development Kit (ADK) is free, with no paid plan attached and is listed for open-source Python/Java framework from Google for building multi-agent systems. Mastra is free, with no paid plan attached and is listed for open-source TypeScript framework (Apache 2.0) for agents, workflows and RAG. Both sit in Agent Frameworks (Developers).
Neither — Google Agent Development Kit (ADK) and Mastra are both free, so the choice comes down to capability rather than cost. Both entries list what they uniquely do above.
Choose Google Agent Development Kit (ADK) if you need open-source Python/Java framework from Google for building multi-agent systems; choose Mastra if you need open-source TypeScript framework (Apache 2.0) for agents, workflows and RAG. Flocci AI Tools does not rank one above the other — it shows both feature sets side by side and lets the requirement decide.
| Google Agent Development Kit (ADK) | Mastra | |
|---|---|---|
| Pricing tier | Free | Free |
| Free to start | Yes | Yes |
| Category | AI Agents & Automation | AI Agents & Automation |
| Type | Agent Frameworks (Developers) | Agent Frameworks (Developers) |
| Listed capabilities |
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| Tags | google adk, agent framework, multi-agent orchestration, open source, gemini agents, vertex ai agents | typescript agent framework, mastra ai, open source agents, workflow engine, javascript agents, vercel ai sdk alternative |
| Website | adk.dev | mastra.ai |
| Full page | Google Agent Development Kit (ADK) details → | Mastra details → |
| Alternatives | Google Agent Development Kit (ADK) alternatives → | Mastra alternatives → |