Pick up to 3 and compare them on the fields our reviews verify.
Compare with Pydantic AI →Reviewed tools whose core is open source.
LangGraph didn't win the "which agent framework" argument by being the friendliest. It won by being the one that doesn't fall over.
The SDK didn't get replaced by the Agents API. It got a sibling.
This isn't Microsoft's first agent framework. It's Microsoft admitting the first two weren't going to converge on their own.
CrewAI didn't get worse. It got a name change, a smaller price sheet, and a genuine security scare it actually fixed properly.
ADK is genuinely serious engineering. "Free" is true of the framework, not of what running it actually costs.
Free MIT-licensed visual builder for agents, RAG and MCP servers with visible tool calls, but the hosted cloud is gone and an exposed server needs constant patching and lockdown.
Each one has a free tier or a free open-source core, per its review.
LangGraph didn't win the "which agent framework" argument by being the friendliest. It won by being the one that doesn't fall over.
The SDK didn't get replaced by the Agents API. It got a sibling.
This isn't Microsoft's first agent framework. It's Microsoft admitting the first two weren't going to converge on their own.
CrewAI didn't get worse. It got a name change, a smaller price sheet, and a genuine security scare it actually fixed properly.
ADK is genuinely serious engineering. "Free" is true of the framework, not of what running it actually costs.
A capable open-source AI app builder, free to self-host or $59 and $159 a month per workspace in the cloud, whose included credits buy only a few dollars of model use, under a modified Apache license and with 21 published security advisories.
A free MIT-licensed agent framework with huge adoption, paired with LangSmith at $0 or $39 a seat whose trace overage rose from $0.50 to $5 per 1,000 in under a year; strong compliance, persistent developer criticism.
Free MIT-licensed visual builder for agents, RAG and MCP servers with visible tool calls, but the hosted cloud is gone and an exposed server needs constant patching and lockdown.
Alternatives our reviews score above 77/100.
JAVIS Score 88 vs 77. LangGraph didn't win the "which agent framework" argument by being the friendliest. It won by being the one that doesn't fall over.
JAVIS Score 86 vs 77. The SDK didn't get replaced by the Agents API. It got a sibling.
JAVIS Score 85 vs 77. This isn't Microsoft's first agent framework. It's Microsoft admitting the first two weren't going to converge on their own.
JAVIS Score 82 vs 77. CrewAI didn't get worse. It got a name change, a smaller price sheet, and a genuine security scare it actually fixed properly.
JAVIS Score 78 vs 77. ADK is genuinely serious engineering. "Free" is true of the framework, not of what running it actually costs.
JAVIS Score 78 vs 77. This is OpenAI finally selling you the thing it already trusted itself to run.
Other reviewed tools in AI Agent Frameworks.
LangGraph didn't win the "which agent framework" argument by being the friendliest. It won by being the one that doesn't fall over.
The SDK didn't get replaced by the Agents API. It got a sibling.
This isn't Microsoft's first agent framework. It's Microsoft admitting the first two weren't going to converge on their own.
CrewAI didn't get worse. It got a name change, a smaller price sheet, and a genuine security scare it actually fixed properly.
ADK is genuinely serious engineering. "Free" is true of the framework, not of what running it actually costs.
This is OpenAI finally selling you the thing it already trusted itself to run.
A serious agent platform for go-to-market teams, with a pricing model you have to model before you build: no free plan, a sales-only public pricing page, and every tool run billed as an Action, even when it fails.
A capable open-source AI app builder, free to self-host or $59 and $159 a month per workspace in the cloud, whose included credits buy only a few dollars of model use, under a modified Apache license and with 21 published security advisories.
A free MIT-licensed agent framework with huge adoption, paired with LangSmith at $0 or $39 a seat whose trace overage rose from $0.50 to $5 per 1,000 in under a year; strong compliance, persistent developer criticism.
Free MIT-licensed visual builder for agents, RAG and MCP servers with visible tool calls, but the hosted cloud is gone and an exposed server needs constant patching and lockdown.