🧰 Tools & API Platforms

Chat products, model API gateways and free-tier platforms · 10 resources (10 checked)

Tool & Platform Beginner

ChatGPT

OpenAI · Tools & API Platforms

OpenAI's conversational product — the free tier is enough to try mainstream model capabilities, and it is most people's first stop with AI.

Freemium Multilingual (incl. Chinese) Details →
Tool & Platform Beginner

Claude

Anthropic · Tools & API Platforms

Anthropic's conversational product, well regarded for long context and coding; the free tier works for daily use.

Freemium Multilingual (incl. Chinese) Details →
Tool & Platform Beginner

Perplexity AI

Perplexity · Tools & API Platforms

An AI-native search engine whose answers cite sources — handy for quickly verifying questions that come up while studying.

Freemium English Details →
Tool & Platform Intermediate

GroqCloud Console

Groq · Tools & API Platforms

Groq's inference cloud runs open models at extreme speed, with free credits on signup.

Freemium English Details →
Tool & Platform Beginner

Google AI Studio

Google · Tools & API Platforms

Google's model playground: call Gemini models and debug prompts right in the browser, with a friendly free tier.

Free English Details →
Tool & Platform Intermediate

OpenRouter

OpenRouter · Tools & API Platforms

A unified LLM API gateway — one key for hundreds of models, some of them free.

Freemium English Details →
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.

Freemium English Details →
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.

Freemium English Details →
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.

Free English Details →
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.

Free English Details →