Try Tatsulok without signing up: one PDF, cited answers, no account

The box at the top of the Tatsulok homepage is the product itself, not a video or a sample answer. It reads "Drop a PDF, or ask a question" (on a phone, "Add a PDF, or ask"). You can start either way.

Add a PDF and Tatsulok reads it, then answers before you ask anything: two sentences on what the file is, each followed by a citation to the passage it rests on. Under that answer sit three questions about your file, ready to tap. Ask a question with no file and you get a normal answer, and when it searches the web, its sources are cited.

A guest chat has room for a few messages of your own. The first answer to your file does not count as one of them.

Each citation opens your file beside the chat, at the page it names, with the quoted passage highlighted. You read the sentence the answer rests on, in your own file, and decide whether it says what the answer says.

When the passage cannot be matched on the page with confidence, the viewer shows the page and highlights nothing, rather than mark the wrong lines.

A document you already know is the quickest test. If you wrote or signed the file, you can tell at a glance whether an answer is right. For more on reading a citation, see Citations you can open.

When the guest messages are used up, one line appears under the last answer: "Sign in free to keep going. This chat and your file come with you." There is no counter and no countdown before it.

Signing in from the same browser moves the chat and the file into your account, a new one or one you already have, and opens the same chat. The file joins your library and is indexed like any file you upload. What you used as a guest is not taken from your free plan.

Come back to the homepage in the same browser and it opens your guest chat again, for up to 7 days after you first used it. A guest chat that is never claimed is deleted after those 7 days, along with its file.

A guest chat is for one file and a few questions. It holds one PDF of up to 10 pages and 5 MB. A scanned PDF, whose pages are pictures with no text to read, is read after you sign in, not before.

The rest of Tatsulok is in the sidebar and opens after sign-in: your library, apps, Mail and Drive (Gmail, Outlook, Google Drive and OneDrive) and settings. A guest chat reads your file and searches the web. It never sends, shares or changes anything outside Tatsulok.

Guest chats also share a daily limit. On a busy day the homepage may say guest chats are paused for today; signing in free works then too.