What happened to ChatPDF.so?

discontinued The URL on file (https://www.chatpdf.so/) did not respond across three consecutive checks; the streak completed on 2026-09-20.

The address on file matched ChatPDF.so's own domain with high confidence, so this observation is reported about ChatPDF.so directly. See the methodology for how the match is made.

The vendor's own description, unedited:
ChatPDF is an AI-powered tool that leverages the capabilities of GPT-4 to interact with PDF documents. The primary function of ChatPDF is to provide meaningful and convenient interaction with text-based PDF files. The tool can be used to summarize lengthy textbooks or complex documents, thus offerin...

Live alternatives

No active same-category alternatives in the registry yet. The tools index carries everything else that is live.

How this was decided

Not an editorial call. The URL on file failed three consecutive checks, with a confirmation re-probe before the streak counted (a bot-wall response never counts as one), and the 3-miss rule marks the listing discontinued automatically. If the URL responds again, the registry restores it on its own: warn first, then active. Both directions are recorded as events.

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