Book Bolt vs SmartKDP for puzzle-book publishing
Competitor figures checked 23 August 2026. Our own prices are read live from our catalogue.
Book Bolt and SmartKDP overlap more than most pairs in this market: both sell a subscription, both include a book-interior designer, and both generate puzzles. So this comparison is about the specifics — which plan unlocks puzzle creation, how many puzzle types each product names, and what you can do before paying anything.
Every figure about Book Bolt below was read from their own public pricing page on the date shown beside it, and linked so you can open it yourself. Nothing here characterises their product: where we have no public source for something, the page says what SmartKDP does instead of guessing at what they do.
We build one of these two, which is why the SmartKDP side carries scope on every capability — which plan it needs and what it does not cover — rather than a list of features with the conditions left off.
Side by side
| SmartKDP | Book Bolt | |
|---|---|---|
| Which plan unlocks puzzle creation | Puzzle generation starts on the free plan — six puzzle types, three generations a month, three projects. Every puzzle type is included on Creator at $19 a month. Free-plan exports carry a watermark and skip KDP preflight validation. | The Puzzle, Crossword and Sudoku Creation Tools are listed on the Pro and Premium plans. Pro is listed at $23.99 a month, or $19.99 a month billed annually. The lowest plan, Newbie at $11.99 a month, does not list them.
Source: bookbolt.iochecked 23 August 2026 |
| Plan structure | A free plan, three subscription tiers — Creator at $19 a month, Publisher at $39 a month, Studio at $59 a month — and a one-time Founders' Lifetime purchase at $249. | Three subscription plans listed month to month at $11.99, $23.99 and $35.99, with the upper two also listed at $19.99 and $29.99 a month billed annually against a stated 17% yearly saving. Monthly AI credit allowances of 500, 1,000 and 4,000 are listed alongside them.
Source: bookbolt.iochecked 23 August 2026 |
| How many puzzle types are named | 109 puzzle types, spanning word puzzles, word-search variants, number and logic puzzles, mazes and paths, arithmetic practice, early-learning pages, and activity pages. Six are on the free plan. Every type is included from Creator upwards; the Founders' Lifetime purchase is a frozen set of twenty and does not track new additions. | Three puzzle tools are named on the pricing page: Puzzle Creation Tool, Crossword Creation Tool and Sudoku Creation Tool. Source: bookbolt.iochecked 23 August 2026 |
| What you can do before paying | The free plan runs the whole editor with no card and no expiry, and the free Word Search Generator and KDP calculators need no account at all. Free-plan exports carry a watermark and skip KDP preflight validation. | A 3-day free trial is listed on every plan, described as risk-free and cancellable at any time. No permanently free plan is listed.
Source: bookbolt.iochecked 23 August 2026 |
What SmartKDP does differently
Generated puzzles stay editable
A generated puzzle is made of the same objects as anything you place by hand, so you can recolour cells, change fonts, move the grid, and edit a single clue after generating.
Every generator emits a semantic content model together with a subtree of ordinary editor objects — not a flattened image and not an SVG. There is no separate code path for “imported” puzzles, which is why a generated grid responds to the same selection, alignment and styling tools as a rectangle you drew yourself. It is also why re-running a generator with a different colour does not discard the edits you already made.
One renderer for the preview and the printed page
The browser preview and the exported interior PDF are drawn by the same code from the same instructions, so a page cannot render one way on screen and another way in the file.
Bleed is the intended difference: the export carries it and the on-screen page does not show it as printed area.
The puzzle engine emits a display list that Skia replays in both places — compiled to WebAssembly in the browser and natively on the export worker. That is an unglamorous architectural choice with one very practical consequence: there is no second rendering path that can drift, so “it looked fine in the editor” stops being a category of bug rather than being a thing we promise to watch for.
KDP preflight runs before the file leaves the editor
Exports are checked against KDP's published print requirements — trim and bleed, gutter margins, image DPI, embedded fonts, page size and count, and a 7pt minimum type size — and a failing check blocks the export and names what failed.
Included on Creator and above and with Founders' Lifetime. Free-plan exports are watermarked and are not preflight-validated. PDF/X-1a conformance is emitted on the CMYK export path. Passing preflight does not guarantee that KDP will accept a book.
The check is a gate, not a report you have to remember to read: an export that would fail KDP's requirements does not produce a file. The list of checks is derived from Amazon's own published print specifications, and the failure message tells you which page and which check, so the fix is a specific edit rather than a guess.
A duplicate-content check across your own books
The KDP upload package includes a certificate recording that no two puzzles in the book are identical in content, and that none is identical to a puzzle in your other SmartKDP projects.
Included on Publisher and Studio. The check compares identical content: a puzzle that is another rotated, mirrored, or with its symbols relabelled is not reported. It covers this book and your own SmartKDP projects only — not books by other authors, and nothing published outside SmartKDP.
The certificate prints its own scope on its face, in those words, because an author who reads “uniqueness certificate” will reasonably hear “these puzzles are unique” — and that is a bigger claim than any tool can make about the whole market. What it can tell you is that you have not accidentally shipped the same puzzle twice, which is the mistake bulk generation actually produces.
Four pages laid out by that generator. Each one is a free printable you can open and print before deciding anything:
Questions
Which is cheaper for making puzzle books?
That depends on volume, and the two price different things, so compare the figures in the table above against what you actually intend to publish rather than the headline numbers. The structural difference is at the bottom end: SmartKDP has a free plan that does not expire, with six puzzle types and three generations a month, and Book Bolt's pricing page lists a 3-day trial rather than a permanently free plan.
How many puzzle types does each one have?
Book Bolt's pricing page names three puzzle tools: Puzzle, Crossword and Sudoku. SmartKDP has 109 puzzle types, six of them free forever and the rest included from the Creator plan. Both figures are counts of what each company publishes, not a judgement about either.
Can I edit a puzzle after generating it in SmartKDP?
Yes — that is the design the product is built around. A generated puzzle is placed as ordinary editor objects, so you can resize the grid, retype one clue, change fonts and colours or move it to another page without regenerating. We make no claim here about how any other product behaves after generation, because we have no public source for it.
Does SmartKDP do keyword research like KDP Spy?
Not in the same form, and it is worth being direct about that. There is a free keyword expander built on Amazon's own search suggestions, a free category finder, a free BSR sales calculator and a browser extension that reads rank and listing data on Amazon pages. There is no competitor sales database.
Do both products design covers as well as interiors?
Book Bolt's pricing page lists a Cover/Interior Designer on every plan. SmartKDP has a Cover Designer that computes the spine width from the book's real page count and exports a full wrap, included from Creator. The two are separate products and we have not compared their features here, because that comparison would need claims about theirs we cannot source.
How current are the prices on this page?
SmartKDP's prices are read from our live catalogue when this page renders, so they cannot go stale. Book Bolt's figures were read from their public pricing page on the date shown beside each claim; if you find they have changed, tell us and we will correct the page.
Every figure above about Book Bolt was read from their own public pages on the date shown beside it, and links to the page it came from. Book Bolt is a trademark of its owner; we name it here to identify the product being compared and claim no affiliation with it. If you believe something on this page is inaccurate, tell us — we correct or substantiate within 72 hours.
SmartKDP is not affiliated with, endorsed by, or sponsored by Amazon. Amazon, Kindle, and Kindle Direct Publishing are trademarks of Amazon.com, Inc. or its affiliates.
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