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KDP Spy by Book Bolt

Chrome extension by https://bookbolt.io/ · Productivity · Workflow

A Chrome extension in Productivity · Workflow with 50 000 users, an established extension.

Specific sites only: 3 match patterns.

What the developer says, and 2 screenshots

Loading from the Chrome Web Store. Open the listing if it does not appear.

Users
50 000
Rating
2.4 (97 ratings)
Users, last 16 days
unchanged
Rating, last 30 days
Not watched long enough to say
Version
3.0.29
Updated in the store
2026-04-24
Published
2019-02-13
Manifest
V3
Browser access
3 permissions, 3 site patterns

How it has moved

Users
unchanged since 01.09
50k · 3 readings
  1. 2026-09-0150k
  2. 2026-09-0850k
  3. 2026-09-1650k
Rating
-0.014 since 01.09
reviewsrating 2.361-2.375 · 3 readings
  1. 2026-09-01reviews96rating2.375
  2. 2026-09-08reviews97rating2.361
  3. 2026-09-16reviews97rating2.361
Users
unchanged since 01.09
50k · 3 readings
  1. 2026-09-0150k
  2. 2026-09-0850k
  3. 2026-09-1650k
Rating
-0.014 since 01.09
reviewsrating 2.361-2.375 · 3 readings
  1. 2026-09-01reviews96rating2.375
  2. 2026-09-08reviews97rating2.361
  3. 2026-09-16reviews97rating2.361

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing more than once a day and record a point only when something moves. History beyond ninety days is in the app.

What it can reach

Specific sites only: 3 match patterns.

  • https://members.bookbolt.io/*
  • https://www.amazon.com/*
  • https://completion.amazon.com/*
  • See the address and title of every tab you have open tabs
  • Run its own code on the pages it can access scripting
  • Store data in your browser storage

The full permission history for this extension

What changed recently

Nothing has moved on this listing since we started watching it.

The publisher

https://bookbolt.io/ publishes 2 listings we track, 70k users between them. Listed website: bookbolt.io.

  1. Book Bolt Lister https://bookbolt.io/ · Productivity · Workflow · published 2019-02-17 20k users ★ 3.3

Like this one

Listings the catalog judges closest in what they say they do.

  1. KDP Pro - Amazon KDP Researcher Describes nearly the same job, smaller audience 92 users ★ 4.2
  2. Royalty Guild Market Analyst Describes nearly the same job, smaller audience 113 users ★ 5.0
  3. Pubscout: KDP Book Sales & Keyword Research on Amazon Describes nearly the same job, smaller audience 31 users
  4. KDSPY – Keyword Research for Authors Describes nearly the same job, with an established audience 70k users ★ 3.7
  5. Inkario — Self-Publishing Research Describes nearly the same job, smaller audience 7 users

The top 5 only. The full comparison, with why each one is close, is on the alternatives page; ranking a whole neighbourhood by your own criteria is in the app.

Is this your extension?

Connect it to Ext Ops Panel and see installs, uninstalls and uninstall reasons as events arrive, not as a weekly summary.

See what the panel does

Figures come from our own daily pass over the public Chrome Web Store listing, last read on . We publish no contact details for extension developers.