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Which AI chatbot is the most private?

October 30, 2026

There is no single answer, because "private" means four different things. If you want anonymity, DuckDuckGo's Duck.ai needs no account and proxies your requests. If you want encryption on saved chats, Proton's Lumo offers zero-access encryption and no logs, per Proton. If you want no transcript kept, nixm keeps none; a distilled log of the session dissolves after seven days. If you want nothing leaving your machine, run a model locally. The right pick depends on which of those you actually need.

Updated October 2026. Re-checked against each vendor's current policy pages. The ranking has not changed, but the AI Overview answer to this question now names a single tool, which is exactly the mistake this page exists to correct: the most private chatbot for a saved research project and the most private one for a sentence you would never want written down are not the same tool.

First decide what "private" means to you

Most comparisons of private AI chatbots rank tools on a single scale, which is why they disagree with each other. Privacy is at least four separate properties, and no tool maximises all of them.

Anonymity — the provider does not know who you are. Encryption — what is stored cannot be read by the provider. Retention — how long anything exists at all. Locality — whether your words leave your device. A tool can be anonymous but keep transcripts for a month. It can encrypt your history perfectly while requiring an account tied to your email. Pick the property that matters for what you are about to type, then pick the tool.

Anonymity: Duck.ai (DuckDuckGo AI Chat)

No account, no sign-in. Per DuckDuckGo, requests are routed through its own proxy so the underlying model providers do not see your IP address, and the providers have agreed not to use the conversations for training. You get a choice of well-known models. The trade: DuckDuckGo's own policy says chats are removed within 30 days, so there is a server-side window, and there is no persistent history because there is no account to attach it to. Best for quick questions you would rather not have tied to you. How anonymous Duck.ai actually is.

Encryption: Proton Lumo

From the company behind Proton Mail. Proton's claim is zero-access encryption on saved conversations — meaning Proton itself cannot read them — plus no logs and no training on your chats. It is the strongest architectural guarantee on this list for anyone who wants to keep a history and still keep it private. The trades are real: a Proton account is required, the free tier is tight, and reviewers consistently describe it as basic next to mainstream assistants. Best for people already in Proton's ecosystem who want their history to exist and stay sealed.

No retention after the reply: Brave Leo

Built into the Brave browser. Per Brave, Leo does not log or retain chats after a response, proxies requests so they are not tied to your IP, builds no profile, and needs no login on the free tier. Chat history, where it exists, lives on your device. The trade is that you have to be using Brave, and the heavier-usage Premium tier is a subscription. Best for people who already live in the browser and want AI answers without a separate account.

Local-first: Venice, or your own model

Venice stores conversation history in your browser rather than on its servers and accepts payment methods that are not tied to your name; it is also deliberately uncensored, which is a feature or a problem depending on what you need. Further along the same axis, running a model on your own hardware — Ollama and similar — means nothing leaves the machine at all. That is the highest privacy ceiling available and the most technical to set up, and the models you can run locally are smaller than the ones in the cloud.

No transcript kept: nixm

nixm takes the retention axis as far as a working product can. No transcript of the conversation is kept: it is not encrypted, not anonymised and not held for 30 days. What persists is the signal. That is your intent and a distilled log of the session, working notes rather than a transcript, plus any reference images you upload. All of it dissolves seven days after creation. No account is needed to start; rendering a video takes a free sign-in with no card. No transcript accumulates to be requested; what exists is a seven-day distilled log that then dissolves. How that works, and why "never stored" is a different promise from "encrypted."

The trades, stated plainly: you get no history, because there is none to keep. Anyone you share a signal link with works from its distilled log, so share with that in mind. And nixm is a focused thinking space and a cinematic video studio, not a general-purpose assistant with a menu of models. If you need a long-running project with a searchable past, Lumo fits better. If you need something you can say once, with no transcript kept and everything gone in a week, this is the property nixm was built around.

What about ChatGPT's Temporary Chat, or Claude's incognito?

They exist and they help. But they are private modes on services whose default is to keep things, and a mode is a setting you have to remember to turn on. ChatGPT's Temporary Chats still sit on OpenAI's servers for about 30 days. Claude trains on consumer chats only when its model improvement setting is on, and Anthropic says incognito chats are never used for training; the details are in is Claude private. Those are mainstream tools configured for more privacy, which is a different category from tools built around it. What Temporary Chat actually does.

Which AI chats don't save your history?

All of the tools above, each in a different sense, and the difference decides what can still leak, be trained on or be handed over. Lumo saves your history, encrypted. Venice saves it in your browser. Duck.ai has no account to save it to, though its own help pages describe keeping anonymized usage data, and chats sync encrypted between your devices if you turn that on. Brave Leo keeps nothing on Brave's servers after the reply. nixm keeps no transcript at all.

Temporary modes are a different kind of "doesn't save". They hide a chat from your own history while the server keeps it for a while: up to 30 days for ChatGPT's Temporary Chats, per OpenAI, and about 72 hours for Gemini's temporary chats, per Google. Those windows are real enough that a court order once swept temporary and deleted chats into evidence. Hidden from your sidebar is not the same as gone.

So which one?

Quick anonymous question: Duck.ai. Encrypted history you can come back to: Lumo. AI inside the browser you already use: Brave Leo. Maximum control and you are comfortable with a terminal: run it locally. Something you need to say out loud with no transcript kept, and nothing left a week later: nixm. The wrong answer is the one that ranks these on a single scale — because the tool that is "most private" for a saved research project is not the one that is most private for a sentence you would never want written down.

Try the one with no transcript to find

Open nixm and seed a signal: no account, no history, no transcript kept.

frequently asked

What is the most private AI chatbot?

It depends on the property. Duck.ai for anonymity (no account, proxied requests), Proton Lumo for encrypted history, Brave Leo for no retention after the reply, a local model for nothing leaving your device, and nixm for no transcript kept, with a distilled log that dissolves after seven days.

Which private AI chatbot needs no account?

Duck.ai, Brave Leo (free tier), Venice, and nixm all work without signing up. Lumo requires a Proton account.

Does Proton Lumo keep logs?

Per Proton, no. Saved conversations use zero-access encryption so Proton cannot read them, and chats are not used to train its models.

Is DuckDuckGo AI Chat really anonymous?

DuckDuckGo proxies requests so model providers do not see your IP, requires no account, and says providers do not train on the chats. Its own policy states chats are removed within 30 days, so there is a server-side window.

Which AI chats don't save your history?

Each draws a different line. Lumo saves history encrypted, Venice saves it in your browser, Duck.ai has no account to save it to, and Brave Leo keeps nothing on its servers after the reply. Temporary modes hide chats from you but keep them on servers for a while: up to 30 days on ChatGPT, about 72 hours on Gemini. nixm keeps no transcript at all.

Is ChatGPT Temporary Chat private?

More private than a normal chat, but Temporary Chats still exist on OpenAI's servers for roughly 30 days and can be subject to legal hold.

What does nixm store?

No transcript. The signal keeps your intent and a distilled log of the session, plus any uploaded reference images, for seven days, and then it all dissolves.

Is a local model the most private option?

For locality, yes — nothing leaves your machine. It is also the most technical to set up, and locally runnable models are smaller than cloud ones.

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