What happened to Instabooks?

discontinued The URL on file (https://instabooks.ai/) did not respond across three consecutive checks; the streak completed on 2026-09-24.

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

The vendor's own description, unedited:
Instabooks AI is a groundbreaking tool that generates tailored AI textbooks based on specific topics of interest. Users can delve into any subject by simply submitting their desired topic, and Instabooks AI will create a customized textbook that provides in-depth content catered to their individual ...

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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