Home › Best AI tools › Free AI developer tools
Free AI developer tools
68 ai developer tools tools with a free plan, free tier or free open-source version. AI Developer Tools tools whose official pricing page shows a free plan or free tier, plus open-source projects. Free plans usually have limits on usage, features or commercial use, so check each one before relying on it.
How to read this page. The tools are grouped by category and are not ranked. Pricing labels come from vendors' own pages when we could confirm them. Always verify plans and limits on the vendor's site.
AI Developer Tools (68)
| Tool | What it does | Pricing | Link |
|---|---|---|---|
| Agenta | Open-source platform for prompt management, evaluation and observability of LLM apps. | Freemium | Official site |
| Aim | Open-source experiment tracker and AI observability tool. | Free | Official site |
| assistant-ui | Open-source React components for AI chat interfaces. | Freemium | Official site |
| Axolotl | Open-source tool for fine-tuning language models. | Free | Official site |
| Braintrust | Evaluation and observability platform for AI products. | Freemium | Official site |
| Chainlit | Open-source Python framework for building conversational AI frontends. | Free | Official site |
| Cleanlab | Tools that detect and fix issues in AI training data and flag untrustworthy LLM responses. | Freemium | Official site |
| Comet ML | ML experiment tracking, evaluation and model management. | Freemium | Official site |
| Confident AI | LLM evaluation platform built on the open-source DeepEval framework. | Freemium | Official site |
| CVAT | Annotation platform for computer vision and audio data, available open source or as a cloud service. | Freemium | Official site |
| Datalab | Document conversion and OCR models and API from the makers of Marker and Surya. | Freemium | Official site |
| DeepSpeed | Microsoft deep learning optimization library for training and inference at scale. | Free | Official site |
| Distilabel | Framework for synthetic data generation and AI feedback. | Free | Official site |
| Docling | Open-source toolkit for converting documents into structured formats for AI. | Free | Official site |
| DVC | Open-source data and model versioning for ML projects. | Free | Official site |
| Eraser | AI diagramming and technical design docs. | Freemium | Official site |
| Feast | Open-source feature store for machine learning. | Free | Official site |
| Fiddler AI | Monitoring, evaluation and guardrails platform for enterprise ML models, LLM apps and AI agents. | Freemium | Official site |
| Firecrawl | API that crawls websites and returns clean, LLM-ready data. | Freemium | Official site |
| Future AGI | Evaluation and observability platform for AI agents and LLM apps. | Freemium | Official site |
| Gradio | Python library for building and sharing web demos of machine learning models. | Free | Official site |
| Guidance | Microsoft-originated library for controlling LLM outputs. | Free | Official site |
| Helicone | Open-source LLM observability and gateway platform. | Freemium | Official site |
| HoneyHive | Observability and evaluation platform for testing and monitoring AI agents. | Freemium | Official site |
| Hopsworks | AI lakehouse and feature store platform for ML and LLM systems. | Freemium | Official site |
| Inngest | Durable workflow engine for background jobs and AI agents. | Freemium | Official site |
| Instructor | Library for getting structured outputs from language models. | Free | Official site |
| Jam | Bug reporting browser extension that captures screen, console and network logs, with AI debugging. | Freemium | Official site |
| Jupyter AI | Open-source generative AI extension for JupyterLab with a chat interface and notebook magics. | Free | Official site |
| Kedro | Open-source Python framework for reproducible data science pipelines. | Free | Official site |
| Kiln | Free desktop app for building AI tasks, synthetic datasets, evals and fine-tunes. | Free | Official site |
| KServe | Open-source model serving on Kubernetes. | Free | Official site |
| Laminar | Open-source observability and evaluation platform for AI agents. | Freemium | Official site |
| Langfuse | Open-source LLM engineering platform for tracing, evaluation and prompt management. | Freemium | Official site |
| LangWatch | LLM observability, evaluation and agent testing platform. | Freemium | Official site |
| llama.cpp | Open-source C/C++ library for running language models efficiently on local hardware. | Free | Official site |
| LlamaFactory | Open-source toolkit with a web UI for fine-tuning 100+ LLMs and vision-language models. | Free | Official site |
| Ludwig | Open-source declarative framework for building custom AI models and fine-tuning LLMs. | Free | Official site |
| Lunary | Open-source platform for LLM observability, prompt management and evaluations. | Freemium | Official site |
| Metaflow | Open-source framework for building and managing ML and AI systems. | Free | Official site |
| Mindee | Document parsing API for invoices, receipts and IDs. | Freemium | Official site |
| MinerU | Open-source tool that converts PDFs into machine-readable Markdown and JSON. | Free | Official site |
| MLflow | Open-source platform for managing the machine learning and GenAI lifecycle. | Free | Official site |
| MLX | Apple open-source array framework for machine learning on Apple silicon. | Free | Official site |
| NeMo Guardrails | NVIDIA open-source toolkit for adding programmable guardrails to LLM apps. | Free | Official site |
| OpenCV | Open-source computer vision library. | Free | Official site |
| Oumi | Open platform for building, training and improving specialized AI models and agents. | Free | Official site |
| Outlines | Library for constraining language model output to defined structures. | Free | Official site |
| PEFT | Hugging Face library for parameter-efficient fine-tuning. | Free | Official site |
| Postman | API platform for designing, testing and documenting APIs, with AI tools for building agents. | Freemium | Official site |
| Pydantic Logfire | Observability platform from the Pydantic team for tracing apps and LLM calls, built on OpenTelemetry. | Freemium | Official site |
| Ragas | Open-source toolkit for evaluating retrieval-augmented generation applications. | Free | Official site |
| Ray | Open-source framework for scaling Python and AI workloads. | Free | Official site |
| Respan | Open-source AI gateway with built-in observability and evals for LLM apps and agents (formerly Keywords AI). | Freemium | Official site |
| Roboflow | Computer vision platform for labeling, training and deploying models. | Freemium | Official site |
| sentence-transformers | Python library for text and image embeddings. | Free | Official site |
| Sentry | Error and performance monitoring platform with Seer, an AI agent for debugging issues. | Freemium | Official site |
| SGLang | Open-source fast serving framework for large language and vision-language models. | Free | Official site |
| spaCy | Open-source library for industrial-strength natural language processing in Python. | Free | Official site |
| Streamlit | Python framework for building data and AI web apps. | Free | Official site |
| TensorBoard | Open-source visualization toolkit for machine learning experiments. | Free | Official site |
| torchtune | PyTorch library for fine-tuning LLMs. | Free | Official site |
| Traceloop | LLM observability platform built on OpenLLMetry, an open-source OpenTelemetry extension. | Freemium | Official site |
| Transformers | Hugging Face library of pretrained models for text, vision, audio and multimodal tasks. | Free | Official site |
| TRL | Hugging Face library for post-training LLMs with SFT, DPO and RL. | Free | Official site |
| TruLens | Open-source library for evaluating and tracing LLM apps and agents. | Free | Official site |
| Ultralytics YOLO | Computer vision models and platform for object detection and segmentation. | Freemium | Official site |
| vLLM | Open-source high-throughput inference engine for large language models. | Free | Official site |