Paul
As of this writing in November 2026, ChatGPT and Gemini both let you chat on the web without an account, but Claude wants you to have an account and signed in. Copilot is the confusing one, because Microsoft's own pages disagree. Every no-account option has the same caveats: nothing you type is saved for later, and the best features stay behind a sign-in.
ChatGPT has worked without an account since April 2024. OpenAI's help center says it can be used logged out in supported countries, but you can only have one conversation at a time, and chats stay available only for that session in that browser. Access also varies by location and network, so some people still get a sign-up prompt before they can send anything. OpenAI's original announcement said what you type may be used to train its models, and that you can turn that off in Settings whether you have an account or not.
Gemini works the same way on the web. Google's help page says "you can use some features in the Gemini web app, gemini.google.com, without signing in," and that you'll need a Google Account to use more features or save your activity.
Copilot is a coin flip. A Microsoft support page still says sign-in "isn't required," though signing in adds chat history, image creation, longer conversations, and voice. But Microsoft's Copilot terms of use, effective August 18, 2026, say "you must be logged in with a Microsoft account to use Copilot." Expect a sign-in prompt. If you do get in without one, Microsoft's privacy FAQ says it doesn't train on conversations from people who aren't logged in.
Claude doesn't have a guest mode. Anthropic's help center says anyone in a supported location can use the free version by going to claude.ai and "signing up using an email address." A free account costs nothing and gets you saved chats and projects, so it's worth the minute it takes.
Duck.ai is the closest thing to a no-strings option. DuckDuckGo runs it, says no account is required, and anonymizes your chats before they reach the model companies. Its help page lists the free models as Claude 4.5 Haiku, Mistral Small 4, GPT-6 Luna, GPT-5.4 mini, and two open models, gpt-oss-120b and Gemma 4 31B. That makes Duck.ai the one way to use a Claude model without signing up, though it's an older, smaller one. There's a daily usage limit that resets at midnight UTC, and paid DuckDuckGo subscribers get bigger models, including Claude Sonnet 5.5 on the Plus plan and Claude Opus 5.5 on Pro.
Skip the fake "free ChatGPT" sites and apps
Search for "free chat gpt" or "AI chat no sign up" and you'll find plenty of sites and apps that aren't run by any of these companies. Some pass your prompts through someone else's account and wrap the answers in ads, and some look free right up until they ask for a card number. An app store listing called "Chatbot" or "AI Chat" with a familiar-looking icon isn't ChatGPT. Check that the developer is OpenAI, Google, Anthropic, Microsoft, or DuckDuckGo before you install anything.
The safe move is to type the address yourself: chatgpt.com, gemini.google.com, claude.ai, copilot.microsoft.com, or duck.ai. We covered the same trick aimed at developers in our post on fake Claude Code install sites, where lookalike pages bought search ads to hand out malware.
No account also doesn't mean private. Whatever you paste into a chatbot leaves your computer, so keep passwords, account numbers, and anything about your health or legal trouble out of a session you can't even go back and delete. If you plan to use one of these regularly, a free account from the real company is the better deal, since you get your history back, more features, and a settings page where you can see and change how your data is used.
Sources
OpenAI Help Center: The ChatGPT home page - Using ChatGPT without an account in supported countries, one conversation at a time, chats lasting only for the browser session, and location or network sign-up prompts.
OpenAI: Start using ChatGPT instantly - April 1, 2024. The launch of no-sign-up ChatGPT and the training opt-out for logged-out users.
Gemini Apps Help: What you need to sign in to Gemini Apps - Some Gemini web features without signing in, and a Google Account needed for more features and saved activity.
Microsoft Support: Microsoft Copilot (free) vs Copilot in Microsoft 365 - Sign-in described as not required, and the features signing in adds.
Microsoft Copilot terms of use - Effective August 18, 2026. You must be logged in with a Microsoft account to use Copilot.
Microsoft Support: Privacy FAQ for Microsoft Copilot - No training on conversations from users who aren't logged in.
Claude Help Center: What is the Pro plan? - The free version of Claude requires signing up with an email address.
Duck.ai - No account required.
DuckDuckGo Help: Duck.ai - Anonymized chats, the free model list, and the models added for Plus and Pro subscribers.
DuckDuckGo Help: Does Duck.ai have usage limits? - Free use with a daily limit that resets at midnight UTC.
