Compare DevTools
Free AI coding tools to compare
Comparison of free or open-source AI developer tools: limits, official sources, use cases and paid alternatives.
Free AI coding tools to compare
This page targets teams starting without a subscription while understanding the real limits of free offers.
| Tool | Public price | Normalized monthly price | Best for | Source |
|---|---|---|---|---|
| LangGraph LangChain's open-source framework for stateful, controllable and production-ready agent workflows. |
Open source / platform | $0 | Building reliable stateful agents, multi-agent graphs and long-running workflows | Official source |
| LangSmith LangChain's observability and evaluation platform for debugging and improving LLM applications. |
$0+ usage | $0 | Tracing, debugging, evaluating and monitoring LangChain and agent applications | Official source |
| Langfuse An open-source LLM engineering platform for tracing, evals, prompts and cost governance. |
$0+ | $0 | Open-source LLM observability, evals, prompt management and cost tracking | Official source |
| OpenAI Agents SDK OpenAI's lightweight SDK for building production agent loops with tools, handoffs and tracing. |
Open source + API usage | $0 | Code-first agent applications with tool execution, handoffs, tracing and state | Official source |
| Vercel AI SDK Vercel's open-source toolkit for adding streaming AI features, tools and agents to web apps. |
Open source + provider usage | $0 | Building streaming AI applications and agents in modern web frameworks | Official source |
| LlamaIndex A leading data framework for building RAG and document-agent applications around private knowledge. |
$0+ credits | $0 | RAG, document agents, parsing, indexing and data workflows for LLM applications | Official source |
| LiteLLM An open-source AI gateway for routing, budgeting and governing access to many LLM providers. |
Open source / enterprise | $0 | Unifying 100+ LLM providers behind one OpenAI-compatible gateway | Official source |
| OpenHands A serious open-source platform for autonomous coding agents, team workflows and enterprise self-hosting. |
Open source · free local start | $0 | Open-source cloud coding agents and org-wide automation | Official source |
| Braintrust A collaborative AI eval and observability platform for measuring agent quality before and after release. |
$0+ usage | $0 | Evaluation, experiments and observability for production AI products | Official source |
| Arize Phoenix Arize's open-source observability platform for tracing, evaluating and improving AI applications. |
$0+ | $0 | Open-source AI observability, tracing, evaluation and prompt iteration | Official source |
| Promptfoo An open-source LLM testing and red-teaming toolkit for catching quality and security regressions. |
Open source / enterprise | $0 | Automated LLM evals, red teaming, security testing and CI/CD checks | Official source |
| Pydantic AI A Python agent framework for teams that want type-safe LLM apps with Pydantic ergonomics. |
Open source | $0 | Type-safe Python agents and production AI apps built around Pydantic validation | Official source |
| OpenRouter A model router and marketplace for calling many frontier and open models through a single API. |
Pay as you go | $0 | Accessing hundreds of hosted models through one API with routing and fallbacks | Official source |
| GroqCloud Groq's developer inference cloud for very fast responses on supported open models. |
$0+ usage | $0 | Ultra-low-latency LLM inference for agents, chat and developer apps | Official source |
| Pinecone A fully managed vector database for production RAG, semantic search and AI memory workloads. |
$0+ usage | $0 | Managed vector database, hosted embeddings/reranking and RAG apps at production scale | Official source |
| Weaviate An open-source AI database for vector search, RAG and memory with managed cloud paths. |
$0+ / $45+ | $0 | Open-source vector search, hybrid retrieval, RAG and AI memory platforms | Official source |
| Qdrant A Rust-based open-source vector database with strong filtering and managed cloud scaling. |
$0+ | $0 | High-performance vector search with filtering, hybrid retrieval and Rust-native operations | Official source |
| CodeRabbit A focused PR review layer when code review quality matters more than autocomplete. |
$0 free PR summaries | $0 | AI pull request review and summaries | Official source |
Frequently asked questions
Which AI coding tool should you choose by budget?
LangGraph is one of the most accessible options in this selection. The final choice should also account for limits, agent depth and privacy.
Is public pricing enough to decide?
No. Also compare quotas, seat pricing, model limits, team controls, BYOK, official sources and migration cost.
Which tool should be tested first?
LangGraph stands out in this selection. Test it on a real ticket with two close alternatives before buying.