Duck.ai — private AI chat from DuckDuckGo
A free way to use several well-known chat models — including ones from OpenAI and Anthropic alongside open models like Llama and Mistral — without an account and without the model provider seeing who you are. DuckDuckGo strips your identity and passes the request on, and says the providers agree not to train on what goes through it. Supports image and PDF uploads, image generation and voice chat, with daily limits on the free tier.
Why I recommend it: The most frictionless privacy win on this list: no sign-up, nothing to cancel, and it takes about four seconds to start. Good for the everyday questions you do not want attached to a profile. Be clear about what it does and does not do — DuckDuckGo hides who you are from the model provider, but the words you type still travel to that provider's servers, so it is not the same as encryption or running a model on your own machine. There is a paid upgrade for higher limits.