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Head-to-head · AI Agent Platforms

Google Agent Development Kit vs Google Vertex AI Agent Builder

  • Updated Oct 2026
  • Both researched from official sources
  • 6 checks side by side
Higher score Google Agent Development Kit #4 in AI Agent Platforms 9.1/10 Free plan Free plan✓ 5 of 5 features Visit Google ADK
Google Vertex AI Agent Builder #15 in AI Agent Platforms 8.0/10 Paid ✓ 5 of 5 features Visit Google Cloud

Google Agent Development Kit leads on 0 checks, Google Vertex AI Agent Builder on 0, and 6 are even. Who comes out ahead on the 6 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreGoogle Agent Development Kit · 9.1/10
  • Free planonly Google Agent Development Kit

Google Agent Development Kit scores higher on our rubric for ai agent platforms: 9.1 against 8.0 out of 10; our editors rank them #4 and #15.

On deployment model, Google Agent Development Kit gives you Both where Google Vertex AI Agent Builder offers Cloud.

Google Agent Development Kit is the better fit for developers building flexible open-source agents. Google Vertex AI Agent Builder is the better fit for google Cloud teams needing managed agent infrastructure.

  • Google Agent Development Kit fits best

    Developers building flexible open-source agents

  • Google Vertex AI Agent Builder fits best

    Google Cloud teams needing managed agent infrastructure

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Side by side

Feature Google Agent Development Kit 9.1/10 Visit ↗ Google Vertex AI Agent Builder 8.0/10 Visit ↗
At a glance
Editor score 9.1 8.0
Ranking #4 in AI Agent Platforms #15 in AI Agent Platforms
Best for Developers building flexible open-source agents Google Cloud teams needing managed agent infrastructure
Pricing model Free Paid
Starting price Free plan —
Free plan ✓ (best) Not checked yet
Free trial — —
Deployment Cloud, Self-hosted Cloud
Platforms Web Web
Support Community, Docs Community, Docs
Integrations 8 integrations 6 integrations
Built for Small business, Mid-market, Enterprise Mid-market, Enterprise
Features Google Agent Development Kit 5/5 · Google Vertex AI Agent Builder 5/5
Visual agent builder ✓ ✓
Multi-agent support ✓ ✓
Knowledge grounding ✓ ✓
Voice agent support ✓ ✓
Human handoff ✓ ✓
Specs
Deployment model Both Cloud
Our review
Pros
  • Supports code-first development in Python, TypeScript, Go, and Java
  • Combines multi-agent workflows with voice, multimodal input, and grounding
  • Deploys locally, in containers, or across Google Cloud targets
  • Combines visual Agent Studio with code-first Agent Development Kit
  • Supports multi-agent workflows, grounding, memory, and managed deployment
  • Connects agents to Google Search, MCP, IAM, storage, and observability
Cons
  • The drag-and-drop visual workflow builder is experimental
  • Model, Agent Runtime, and Google Cloud usage may add separate charges
  • Its developer-focused approach may not suit no-code-first teams
  • Cloud-focused deployment limits fit for teams seeking broader hosting options
  • Usage-based pricing spans multiple services and resource-based charges
  • The broad platform may exceed the needs of teams building simple agents
Our verdict

Google Agent Development Kit is an open-source framework for developers creating AI agents and multi-agent applications. It supports code-first development in Python, TypeScript, Go, and Java, while also providing a development web…

Read the review →

Google Vertex AI Agent Builder is Google Cloud’s suite for developing and operating AI agents, presented within Gemini Enterprise Agent Platform. It combines low-code visual design in Agent Studio with the Agent Development Kit for…

Read the review →
  1. Google Agent Development KitAI Agent Platforms 9.1Free plan
  2. Google Vertex AI Agent BuilderAI Agent Platforms 8.0Paid

Strengths and trade-offs

  • Google Agent Development Kit — where it wins

    • Supports code-first development in Python, TypeScript, Go, and Java
    • Combines multi-agent workflows with voice, multimodal input, and grounding
    • Deploys locally, in containers, or across Google Cloud targets

    Where it doesn't

    • The drag-and-drop visual workflow builder is experimental
    • Model, Agent Runtime, and Google Cloud usage may add separate charges
    • Its developer-focused approach may not suit no-code-first teams

  • Google Vertex AI Agent Builder — where it wins

    • Combines visual Agent Studio with code-first Agent Development Kit
    • Supports multi-agent workflows, grounding, memory, and managed deployment
    • Connects agents to Google Search, MCP, IAM, storage, and observability

    Where it doesn't

    • Cloud-focused deployment limits fit for teams seeking broader hosting options
    • Usage-based pricing spans multiple services and resource-based charges
    • The broad platform may exceed the needs of teams building simple agents

More comparisons

All AI agent platforms comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update