Pay once, not monthly
A Book Bolt alternative for the cover job — free, no subscription
Here's the honest version. There isn't a single pay-once tool that replaces everything Book Bolt does — keyword research, the listing database, interior and puzzle creation are a genuine suite, and if you want all of that in one dashboard, Book Bolt is a reasonable place to get it.
But the cover-sizing job is different. Whether Amazon accepts your cover comes down to a handful of fixed numbers: the full-cover size for your trim, the spine width for your exact page count, 0.125" of bleed on each edge, 300 DPI, and CMYK color. None of that changes month to month, so paying a subscription to get it right is paying rent on a calculation.
That's what this tool does, for free and with no account: enter your trim, page count, and paper, and it returns the exact full-cover size KDP needs plus a correctly-sized template to design on. It's built on a pay-once philosophy — no monthly fee for a job that doesn't need one.
Size your cover right — without a subscription
Enter your trim size, page count and paper. Get the exact full-cover size KDP needs and a correctly-sized template, before you upload. No login, no subscription.
Common questions
Is there a free Book Bolt alternative?
For the cover-sizing job specifically, yes — this KDP Cover Checker computes the exact full-cover size and spine your book needs and gives you a correctly-sized template, free with no account. It doesn't replace everything Book Bolt does (keyword research, listing, interior and puzzle creation), but for getting a cover that Amazon accepts, you don't need a subscription.
Does Book Bolt have a one-time payment option?
No. Book Bolt is subscription-only — its plans run roughly $11.99/month (Newbie) to $23.99/month (Pro), a little less billed annually. There's no buy-once tier, which is the recurring cost a lot of part-time publishers push back on.
What does Book Bolt do that a cover checker doesn't?
Book Bolt is a full suite: niche and keyword research, a listing/product database, cover and interior design tools, and puzzle-book creation. A cover checker does one job — making sure your cover is the right size, resolution, and bleed for KDP. If you want the whole workflow in one place, Book Bolt covers more; if your problem is covers getting rejected, the focused free tool solves that without a monthly fee.
Why do people look for a Book Bolt alternative?
Usually subscription fatigue. A cover that's the wrong size is a fixed calculation — trim, page count, paper, bleed — so paying every month to get it right feels like overkill for what the job actually is. That's the gap a free, pay-nothing cover tool fills.
Book Bolt is a trademark of its respective owner; this is an independent comparison and we are not affiliated with Book Bolt, Amazon, or KDP. Pricing from bookbolt.io/pricing as of June 2026; check there for current rates.