Tool & Platform
Beginner
Google AI Studio
Overview
Google's model playground: call Gemini models and debug prompts right in the browser, with a friendly free tier.
https://aistudio.google.com/
Related resources
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Tool & Platform
Intermediate
GroqCloud Console
Groq · Tools & API Platforms
Groq's inference cloud runs open models at extreme speed, with free credits on signup.
Tool & Platform
Intermediate
OpenRouter
OpenRouter · Tools & API Platforms
A unified LLM API gateway — one key for hundreds of models, some of them free.
Tool & Platform
Intermediate
Together AI
Together · Tools & API Platforms
A cloud platform for serving open models, with serverless and dedicated endpoints plus trial credits on signup.
Official Docs
Intermediate
Cloudflare Workers AI
Cloudflare · Tools & API Platforms
Docs for running models on Cloudflare's edge, deeply integrated with the Workers ecosystem, with a free tier.
Open Source Project
Intermediate
LiteLLM Documentation
BerriAI · Tools & API Platforms
A proxy SDK that calls 100+ LLMs in the OpenAI format, with built-in retries, budgets, and logging.
Open Source Project
Intermediate
Instructor Structured Output Library
Jason Liu · Tools & API Platforms
A Pydantic-based structured output library with solid retry and validation — a great companion for function calling.