kdp · compare · book bolt
A Book Bolt alternative for puzzle books, paid per book
Book Bolt is a monthly suite: keyword research, a cover and interior designer, puzzle tools. vøiddo does one thing: it makes the finished files of a KDP puzzle book, interior and full wrap cover, checked against KDP’s paperback specs. You pay per book, from $3.30, and nothing renews.
| vøiddo | Book Bolt | |
|---|---|---|
| How you pay | One-time book credits: $15 for 3 books, $39 for 10, $99 for 30. Credits never expire. | A subscription. Pro: $19.99 a month billed yearly, or $0.79 a day billed monthly. Premium: $29.99 a month billed yearly, or $1.18 a day billed monthly. |
| Two books this month | $15 pack, one book left over for later | A month of Pro: about $24 on monthly billing |
| What you get | The finished book: interior PDF, full wrap cover with the spine sized to your page count, a signed check of both files, listing text with seven keyword ideas, six preview images. Ready in 3 to 20 seconds. | Tools to make it: “Cover & interior designer (Book Bolt Studio)” and “Puzzle, crossword & sudoku creation tools”. You lay out the book yourself. |
| Puzzles | Sudoku, word search and mazes, easy to expert (word search to hard), large print as an option. Each puzzle is checked by a second, independent program: one solution per sudoku, each word exactly once, one route per maze. | Puzzle, crossword and sudoku tools, as listed on their pricing page |
| KDP file check | Page size, page count, embedded fonts, margins and gutter for the page count, cover size and spine, in a signed report anyone can verify. If KDP rejects the files within 30 days, the credits come back. | Not listed on their pricing page |
| Research | None. listing.txt carries seven keyword ideas for the book. | “Keyword & product research with real Amazon search volume” and the KDP Spy browser extension |
| Trying it | Sample pages and a 10-page sample PDF on the puzzle book page, no account. The spine calculator and the file check are free tools. | “3-day free trial”, full access, then the plan you picked |
Book Bolt figures and quotes from bookbolt.io/pricing, read on 23 October 2026. “About $24” is $0.79 × 30.4 days. Check their page for today’s prices.
Which one fits
- vøiddo fits when you publish puzzle books a few at a time and want finished, checked files without designing pages: a series of large print sudoku or word search books, a test of a new niche, a book a month.
- Book Bolt fits when you use its niche and keyword research every week, design many kinds of books in its studio (journals, planners, covers), and make more than seven or eight books a month: then one subscription can cost less per book than our packs.
- Many publishers use both: research where they research, and our files for the puzzle books themselves.
Questions
Is this cheaper than Book Bolt?
For a few books a month, yes: 2 books cost $15 from a pack against about $24 for a month of Pro on monthly billing, and our credits do not expire if you pause. At eight or more books every month a subscription costs less per book, if its tools make the books you need.
Will KDP accept the files?
Each book passes our check against KDP’s published paperback specs before you can download it. If KDP still rejects the files within 30 days, the book’s credits go back to your key.
Do I need to design anything?
No. Pick the puzzle type, level, trim size, paper and title on the puzzle book page; the program builds the interior and the full wrap cover, and the cover is typeset from the book’s own puzzles.
Can I cancel?
There is nothing to cancel: credits are bought once. Unused credits can be refunded within 14 days of purchase.
Is vøiddo connected to Book Bolt?
No. Book Bolt is a trademark of its owner; this page compares public prices and features as they were on the date above.