Free Radar

Ad-free AI answer engine that summarises pages and never tracks you.

Multi-LLM consensus platform: Ask one prompt and compare answers from Claude, ChatGPT, Gemini, and open models in parallel.

The gold standard in blind LLM evaluation: try anonymous models on the same prompt, vote for the best, and reveal true Bradley-Terry Elo rankings.

Build web apps by chatting with AI, using your own provider API key.

Browser workspace for prompting Gemini models and testing an API key.

Very fast hosted inference for open models, with a free developer tier.

One API key for many models, including a rotating set of free ones.

Practical walkthroughs of AI tools and everyday tech, aimed at non-experts.

Visual mathematics explainers, including a clear neural-network series.

Hub for open models, datasets and hosted demos you can try in the browser.

AI code completion inside your editor.

Bundle of developer tools offered free to verified students.

Vast index of freely available programming books and courses by language.

Harvard's introduction to computer science, free to audit online.