AI Use Cases

Free · Coding · 17 of 17 tools · updated Oct 17, 2026

Free AI tools to build AI agents (frameworks)

Langflow is the strongest tool to build AI agents (frameworks) you can use without paying, at 98/100. What you get for nothing: Free self-hosted. 17 of the 17 tools tracked for this job have a free tier, an open-source licence, or are free outright. It is also the top-ranked tool for this job overall, free or not.

Same evidence score as the ranking — GitHub stars, Hacker News mentions, release activity, free access — recomputed nightly, never sold. See all 17 tools to build AI agents (frameworks).

Top 3

evidence / 100
1
Langflow Open source
Visual low-code builder for RAG and multi-agent flows, acquired by DataStax and now part of IBM.

+ Python-native components can be edited inline, so flows are not limited to built-in nodes.
− Several critical security vulnerabilities in 2025 made exposed instances risky.

Free self-hostedopen sourceweblinuxmacwindows
98—
evidence / 100
2
Dify Open source
Open-source LLMOps platform with a visual builder for agents, RAG pipelines, and workflows.

+ Covers prompt management, knowledge bases, and deployable APIs in one self-hostable app.
− Complex workflows get unwieldy in the visual canvas and version control is weak.

Self-host free; Cloud Professional $59/moopen sourceweblinux
96—
evidence / 100
3
LangChain Open source
Framework of composable building blocks for LLM apps, with integrations for every model and vector store.

+ Largest integration catalogue of any framework, so almost any provider is one import away.
− Frequent breaking API changes and heavy abstractions make simple things feel over-engineered.

Free; LangSmith observability has paid tiersopen sourcecliapi
96—
evidence / 100

All 17, side by side

ToolScorePricingWhat you get freePlatforms
Langflow98Open sourceFree self-hostedweb, linux, mac, windows
Dify96Open sourceSelf-host free; Cloud Professional $59/moweb, linux
LangChain96Open sourceFree; LangSmith observability has paid tierscli, api
Goose92Open sourceFree; bring your own modelcli, mac, linux, windows
AutoGen91Open sourceFreecli, api
CrewAI91Open sourceFree; CrewAI AMP enterprise platform paidcli, api
LlamaIndex90Open sourceFree; LlamaCloud parsing paidcli, api
LangGraph89Open sourceFree; LangGraph Platform hosting is paidcli, api
OpenAI Agents SDK87Open sourceFree; pay OpenAI API usagecli, api
Mastra87Open sourceFree; Mastra Cloud paidcli, api
Google Agent Development Kit85Open sourceFree; pay Gemini usagecli, api
Pydantic AI85Open sourceFree; Logfire observability paidcli, api
Claude Agent SDK80Open sourceFree; pay Claude API usagecli, api
smolagents73Open sourceFreecli, api
Vercel AI SDK72Open sourceFree; AI Gateway usage-basedapi, cli
Flowise42Open sourceSelf-host free; Cloud Starter $35/moweb, linux
Lindy14Free tierno limits publishedweb

A free tier counts, and so does an open-source licence you can self-host — both are in the table, so a tool that is only free for a trial is not here.

Head to head: Langflow vs Dify Langflow vs LangChain Dify vs LangChain

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