Pick up to 3 and compare them on the fields our reviews verify.
Compare with Dify →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 Python agent framework with typed outputs, eight durable-execution engines and built-in evals, now on a v2 line that ships a release every two days; the optional Logfire add-on is free to $249 a month, and GitHub lists 19 patched advisories in 2026.
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.
Free MIT Python agent framework with typed outputs, eight durable-execution engines and built-in evals, now on a v2 line that ships a release every two days; the optional Logfire add-on is free to $249 a month, and GitHub lists 19 patched advisories in 2026.
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 70/100.
JAVIS Score 88 vs 70. 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 70. The SDK didn't get replaced by the Agents API. It got a sibling.
JAVIS Score 85 vs 70. 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 70. 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 70. ADK is genuinely serious engineering. "Free" is true of the framework, not of what running it actually costs.
JAVIS Score 78 vs 70. This is OpenAI finally selling you the thing it already trusted itself to run.
JAVIS Score 77 vs 70. Free MIT Python agent framework with typed outputs, eight durable-execution engines and built-in evals, now on a v2 line that ships a release every two days; the optional Logfire add-on is free to $249 a month, and GitHub lists 19 patched advisories in 2026.
JAVIS Score 72 vs 70. 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.
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.
Free MIT Python agent framework with typed outputs, eight durable-execution engines and built-in evals, now on a v2 line that ships a release every two days; the optional Logfire add-on is free to $249 a month, and GitHub lists 19 patched advisories in 2026.
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 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.