Definable SDK vs Google ADK — AI Agent Framework Comparison
Google ADK is built for Gemini. Definable SDK works with every major model provider — OpenAI, Anthropic, Google, DeepSeek, xAI — with built-in RAG, MCP, and a marketplace.
| Feature | Definable AI | Google ADK |
|---|---|---|
| Model Support | 50+ models across 8 providers | Gemini models (primary), others via LiteLLM |
| Agent API | Class-based with middleware and lifecycle | Class-based with callbacks |
| RAG / Knowledge | Full pipeline — readers, chunkers, embedders, vector DBs | Via Vertex AI RAG or extensions |
| Memory | Multi-tier persistent with auto-recall | Session and long-term memory |
| MCP Support | Native MCP client (stdio + SSE) | Not built-in |
| Guardrails | Input, output, and tool-call guardrails | Callbacks for pre/post processing |
| Multi-Agent | Agent teams with shared context | Multi-agent systems with delegation |
| Interfaces | Discord, Telegram, Signal built-in | Not built-in (web UI via ADK) |
| Deployment | One-click deploy + marketplace | Vertex AI Agent Engine or self-deploy |
| Google Services | Via tool integrations | Native Google Cloud integration |
Why developers choose Definable SDK over Google ADK
- Not locked to Google — use any of 50+ models across all major providers.
- Full RAG pipeline built-in — no Vertex AI dependency required.
- Native MCP support for connecting to external tool servers.
- Built-in messaging interfaces for Discord, Telegram, and Signal.
- Marketplace deployment — publish and monetize agents with one click.
FAQ
What is the difference between Definable AI and Google ADK?
Google ADK is built for Gemini. Definable SDK works with every major model provider — OpenAI, Anthropic, Google, DeepSeek, xAI — with built-in RAG, MCP, and a marketplace.
Is Definable AI better than Google ADK?
Why developers choose Definable SDK over Google ADK: Not locked to Google — use any of 50+ models across all major providers. Full RAG pipeline built-in — no Vertex AI dependency required. Native MCP support for connecting to external tool servers. Built-in messaging interfaces for Discord, Telegram, and Signal. Marketplace deployment — publish and monetize agents with one click.
Can I switch from Google ADK to Definable AI?
Yes. Definable AI offers a free Starter plan with 5,000 credits so you can try it risk-free. Many of the features that require paid add-ons with Google ADK are included in Definable AI's base plans.