Free AI Tools
One curated table per track: tools you can use today without a credit card. Free tiers change; each entry has a verified date.
FreeFree tierOpen source · Verified date = last confirmed the free tier exists
| Tool | What it's for | Tier | Verified |
|---|---|---|---|
| Anthropic Console ↗ | API access with a free tier: test prompts, inspect token usage, manage keys | Free tier | 2026-03 |
| HuggingFace Spaces ↗ | Run hosted AI demos without any local setup or API key | Free | 2026-03 |
| OpenRouter ↗ | Unified API gateway with free-tier access to multiple models | Free tier | 2026-03 |
| Tool | What it's for | Tier | Verified |
|---|---|---|---|
| LangSmith ↗ | Trace, evaluate, and debug LLM chains: free developer tier | Free tier | 2026-03 |
| Weaviate Cloud ↗ | Managed vector database with a free sandbox tier | Free tier | 2026-03 |
| Qdrant Cloud ↗ | Vector search engine with a free tier cluster | Free tier | 2026-03 |
| Cohere API ↗ | Embedding and reranking models: free tier available | Free tier | 2026-03 |
| Tool | What it's for | Tier | Verified |
|---|---|---|---|
| MCP Inspector ↗ | Official browser-based tool for debugging MCP servers | Open source | 2026-03 |
| LangGraph Studio ↗ | Visual IDE for building and debugging agent graphs locally | Open source | 2026-03 |
| Tool | What it's for | Tier | Verified |
|---|---|---|---|
| LangGraph Studio ↗ | Graph-based agent runtime with a local visual debugger | Open source | 2026-03 |
| CrewAI ↗ | Multi-agent orchestration framework: open source core, free tier | Free tier | 2026-03 |
| AutoGen ↗ | Microsoft's framework for multi-agent conversations, runs fully locally | Open source | 2026-03 |
| E2B Sandbox ↗ | Secure cloud sandbox for agent code execution: free tier available | Free tier | 2026-03 |
| Tool | What it's for | Tier | Verified |
|---|---|---|---|
| Ollama ↗ | Run open-weight models locally with one command: no cloud needed | Open source | 2026-03 |
| LM Studio ↗ | Desktop GUI for downloading and running local models | Free | 2026-03 |
| Google Colab ↗ | Free GPU notebooks in the browser: sufficient for most inference experiments | Free tier | 2026-03 |
| HuggingFace Inference API ↗ | Serverless model inference with a free tier | Free tier | 2026-03 |
| Tool | What it's for | Tier | Verified |
|---|---|---|---|
| Langfuse ↗ | Open-source LLM observability: traces, evals, prompt management. Free cloud tier. | Free tier | 2026-03 |
| RAGAS ↗ | Automated RAG evaluation metrics (faithfulness, answer relevancy, context recall) | Open source | 2026-03 |
| Promptfoo ↗ | Open-source prompt testing and red-teaming CLI | Open source | 2026-03 |
| Tool | What it's for | Tier | Verified |
|---|---|---|---|
| Garak ↗ | Open-source LLM vulnerability scanner: probes for prompt injection, jailbreaks, and data leakage | Open source | 2026-03 |
| Promptfoo (adversarial) ↗ | Same tool as Track 6 but used in red-team mode: automated adversarial test generation | Open source | 2026-03 |
| OWASP LLM Top 10 ↗ | The canonical LLM security checklist: free reference, updated annually | Free | 2026-03 |
| Tool | What it's for | Tier | Verified |
|---|---|---|---|
| HuggingFace Spaces (demos) ↗ | Explore no-code AI demos to evaluate capabilities before committing to build | Free | 2026-03 |
| Anthropic pricing calculator ↗ | Official token pricing: use to model cost before building | Free | 2026-03 |
| OpenAI pricing ↗ | Comparative model pricing reference | Free | 2026-03 |
| Tool | What it's for | Tier | Verified |
|---|---|---|---|
| Whisper ↗ | OpenAI's open-source speech-to-text model: runs locally | Open source | 2026-03 |
| LLaVA via Ollama ↗ | Run the LLaVA vision-language model locally with `ollama pull llava` | Open source | 2026-03 |
| HuggingFace Multimodal Spaces ↗ | Browser-based demos for vision, audio, and image generation: no setup needed | Free | 2026-03 |
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