Every other assistant in this series wants your data, your account and your conversation history. Duck.ai is built on the opposite premise. Made by DuckDuckGo — the search company whose entire brand is “we don’t track you” — it lets you chat with leading AI models without an account, without logins, and without your prompts being stored or used to train anything. It launched fully in March 2025 and has quietly grown into one of the most genuinely useful free AI tools around.

The clever part is what Duck.ai doesn’t do. It isn’t trying to out-feature ChatGPT. It’s trying to give you the same models with none of the surveillance — and on that narrow, important mission, it’s excellent.

How the privacy actually works

This is the whole point, so it’s worth understanding. When you send a message, DuckDuckGo strips out the metadata that identifies you — most importantly your IP address — before passing the prompt to the model provider. To OpenAI, Anthropic or the host running Llama and Mistral, the request looks like it’s coming from DuckDuckGo, not from you. There are no user accounts, no server-side chat logs, and your recent conversations live only on your own device.

On top of that, DuckDuckGo has agreements with every provider that bar them from training their models on your prompts or the responses. You can wipe everything instantly with the “Fire” button, switch models from a sidebar at any time, and DuckDuckGo says it never filters or alters the model’s replies. If you don’t want AI at all, you can hide every AI button across search and the browser.

How Duck.ai scores

Overall score: 7.7 / 10, the average of the eight categories above.

What Duck.ai does well

Multiple models, zero friction

You can be chatting in seconds — no sign-up, no email, no card. From a single sidebar you can switch between models from OpenAI, Anthropic, Meta and Mistral mid-conversation, which makes it easy to compare answers or pick the right tool for a task. For anyone who finds the big assistants’ accounts and data prompts off-putting, the sheer frictionlessness is a joy. It’s a similar “many models, one place” idea to HuggingChat or Poe, but wrapped in DuckDuckGo’s privacy guarantee.

It’s grown beyond text

Through late 2025 and into 2026, Duck.ai added real capability without abandoning its principles. There’s now private voice chat — real-time spoken conversations through an encrypted relay, with audio that isn’t stored after the chat ends — plus image generation and editing, and newer reasoning models for working through more complex problems. It’s no longer just a text box.

Genuinely free, genuinely private

The free tier isn’t a crippled teaser. You get unlimited-feeling access to capable models, voice and images, all anonymised, for nothing and with no account. For private research — health questions, money worries, anything sensitive you’d rather not tie to your identity — that combination is hard to beat.

Models and pricing

The base experience is free forever. Advanced models come bundled into DuckDuckGo’s wider paid subscription rather than a standalone AI plan — so you’re also paying for a VPN and identity-protection tools, which is either great value or beside the point depending on what you want.

Pros and cons

Where it falls short

The trade-off for all that privacy is capability. The free models are deliberately the smaller, faster tiers — the “nano”, “mini”, “Haiku” and “Small” versions — which are perfectly good for everyday questions, drafting and summarising, but noticeably behind the frontier models you’d get from a paid ChatGPT or Claude plan. To get GPT-5.4, Claude Sonnet 4.6 or Opus, you need the subscription.

There’s also very little of the “assistant” scaffolding that power users now expect. By design, Duck.ai has no cross-device memory, no custom assistants, no agentic tools or browsing-in-chat, and only light file handling. Your history lives on one device and nowhere else. That’s a feature if you care about privacy and a limitation if you want a tool that remembers your projects and automates work. Duck.ai is a private window onto AI models — not a productivity hub.

Who should use Duck.ai?

Duck.ai is the obvious pick for privacy-conscious users who want to use mainstream AI without handing over their identity, for anyone asking sensitive questions, and for people who like comparing models without juggling multiple accounts. If you already trust DuckDuckGo for search, this is the natural AI companion to it.

It’s the wrong tool if you need the most powerful model for free, persistent memory, agentic features or a place to run involved projects. For those, a full assistant like ChatGPT or an all-in-one like Monica will serve you better.

Verdict

Duck.ai does something no major AI lab will: it lets you use their models while actively protecting you from them. The anonymisation is real, the free tier is genuinely useful, and the addition of voice and image generation has turned a simple privacy gateway into something you could happily use every day. As a statement that powerful AI and personal privacy needn’t be mutually exclusive, it’s quietly important.

It won’t replace a full-featured assistant — the free models are modest and the feature set is intentionally lean — but that’s not its job. For private, no-strings access to good AI, nothing else comes close. Score: 7.7/10.

Frequently asked questions