Frequently asked questions
Is 4in1AI really free?
Yes. No ads, no paywall. Create a free account with Google to save a free OpenRouter key or your own provider keys — they're stored encrypted.
Where are my API keys stored?
Only in your browser's local storage. Requests go straight from your browser to the AI provider — 4in1AI has no servers that see your keys or questions.
Which models can I compare?
ChatGPT, Claude, Gemini and Grok with your own keys, or free models like Gemma 4, Qwen and Nemotron via OpenRouter.
What is Blind Battle?
Model names are hidden as Model A–D. Vote for the best answer and the names are revealed.
What is Super Synthesis?
An AI reads all four answers and lists where they agree, disagree, unique insights, and one final combined answer.