DuckDuckGo

Duck.ai Review: Private Chat Without an Account, Capped Without a Number

Six free models and a daily cap with no number on it

Chat, voice chat and image generation all work without an account, inside a daily limit. The free list has six models: Claude 4.5 Haiku, Mistral Small 4, GPT-5.4 nano, GPT-5.4 mini, gpt-oss-120b and Gemma 4 31B. The developer will not say how many prompts that buys, because each model draws on the limit at a different rate: Mistral Small 4, GPT-5.4 nano, gpt-oss-120b and Gemma 4 31B carry an extra-low limit cost, GPT-5.4 mini a low one and Claude 4.5 Haiku a medium one. A long chat on the Claude model therefore drains the allowance fastest. PDF uploads stop at 15 pages on the free plan, image uploads only work on some models, and spreadsheets are not supported.

Tinfoil, gpt-oss-120b and the "zero provider visibility" label

The service removes your IP address before a prompt reaches OpenAI, Anthropic or Mistral, so every request looks like it came from one company rather than from you, and each provider agrees to delete prompts right after replying and never to train on them. Two models go further: gpt-oss-120b and Gemma 4 31B run inside a Trusted Execution Environment at Tinfoil, and the interface labels them "zero provider visibility". OpenAI and Anthropic may hold a chat in memory for up to an hour to speed up replies, never on disk. Besides your prompt, providers receive only the date, your timezone and a unit system guessed from region; the "Use Approximate Location" setting that adds a city is off by default.

Plus at $9.99, Pro at $19.99: the AI comes inside a VPN bundle

The paid plans are a privacy bundle with AI inside. Plus costs $9.99 a month or $99.99 a year and adds GPT-5.6 Terra, Claude Sonnet 4.6, PDF uploads up to 35 pages and a weekly limit that extends a session once the daily one runs out, alongside a VPN, Personal Information Removal (US only) and Identity Theft Restoration. Pro costs $19.99 or $199.99 and adds Claude Opus 4.8, GPT-5.6 Sol, higher reasoning effort and double the Plus limits. The chat cannot be bought alone, and a plan covers one person. Pro's $19.99 matches ChatGPT Plus and Google AI Pro in US listings. Prices are regional and change.

A full browser around the chat: Search Assist, startup prompts and the off switch

The app you install is a full browser, not a chat app: at our October check, about 83 MB on Android 9 or later and 253 MB on iOS 15 or later. The chat also works in any browser at duck.ai. The start page in the store screenshots carries a Search and Duck.ai toggle, and Search Assist, an optional AI answer, can appear above ordinary results. The chat switches off under Settings > AI Features; Search Assist has its own Never option in search settings. The App Store privacy label lists contact info, usage data and diagnostics, none linked to you. The weak spot is recent Play reviews: several describe slow launches and a long wait for the keyboard, others object to startup prompts promoting the AI chat.