An honest comparison
Squibler is an AI writing app with an editor and visual planning that, per their site, exports EPUB. Bookwiz writes with AI too — and then builds the rest of what Amazon needs: a print-ready PDF, a cover with real spine math, and an AI listing pack. Here is the honest side-by-side.
TL;DR
Choose Squibler if you want an AI editor with visual story planning and an EPUB you will take elsewhere. Choose Bookwiz if you want AI drafting plus the full Amazon layer — print PDF, a spine-math cover, and an AI listing — prepared in the same web app.
| Bookwiz | Squibler | |
|---|---|---|
| Core focus | Write a complete book with AI, then export KDP-ready files and an Amazon listing — all in one web app | AI writing app with an editor and visual planning; exports EPUB (per their site). |
| AI drafting | Switch Claude/GPT/Gemini per prompt on whole-manuscript context | AI writing assistant with an editor and visual story planning (per their site) |
| Ebook (EPUB) export | Standards-compliant EPUB 3 | Exports EPUB (per their site) |
| Print PDF + full-wrap cover with spine math | Full-wrap paperback cover with real spine math from page count; print PDF with trim size and page-count gutter | No print-ready PDF or spine-math cover documented — Squibler documents EPUB export (per their site) |
| AI listing / metadata | AI listing pack: title/subtitle, 7 KDP keywords, BISAC categories, KDP-safe HTML blurb | No metadata generation documented — no keywords, categories, or blurb builder |
| Guided KDP wizard | Guided "Publish to KDP" wizard with recommended price & royalty, KDP Select, territories, DRM, and drafted back matter — never auto-publishes (KDP has no public API) | No publishing wizard documented — you export your file and upload it to KDP yourself |
| Free no-signup tools | 5 free no-signup tools (royalty calculator, spine-width calculator, KDP description formatter, title & outline generators) | A subscription app with a free trial — not a set of free, instant, no-signup web tools |
| Pricing | Free plan; from $14/mo (Explorer) — 30-day money-back on paid plans | Subscription (per their site) |
| Best for | Authors who want to go from idea to a finished, listed Amazon book without stitching tools together | Writers who want an AI editor with visual planning and an EPUB export to take elsewhere |
Comparison reflects publicly available information as of mid-2026.
Squibler pairs an AI writing assistant with an editor and visual story-planning tools, and writers who like to map their scenes and structure visually tend to enjoy that workflow. If a planning-forward AI editor is what you are after — and you are comfortable handling the Amazon side separately — Squibler covers that writing stage well.
Bookwiz adds the publishing layer around the writing — the parts that turn a manuscript into a listed Amazon book.
Per their site, Squibler exports EPUB, which you then upload to KDP yourself — no AI tool auto-publishes to KDP, because KDP has no public publishing API. What differs between tools is how much of the KDP prep they do for you. Bookwiz also produces a print-ready PDF, a full-wrap cover with real spine math, and an AI listing pack, then walks you through the upload in a guided wizard.
Bookwiz is the closest fit if Amazon is your destination. Alongside AI drafting on your whole manuscript, it exports KDP-ready EPUB and print PDF, builds your cover, and generates an AI listing pack (title, 7 keywords, BISAC categories, and a KDP-safe blurb) — the publishing layer beyond the EPUB that Squibler documents.
Squibler pairs an AI writing assistant with an editor and visual story-planning tools, which writers who like to map scenes and structure visually appreciate. If your priority is a planning-forward AI editor and you are comfortable handling the Amazon side separately, Squibler covers that writing stage.
Both are subscriptions (Squibler’s pricing is on their site; Bookwiz is free plan; from $14/mo (explorer) with a 30-day money-back guarantee). The honest way to decide is by scope: if you only need an AI editor and an EPUB, compare the writing experience directly; if you also want print files, a cover, and your Amazon listing prepared, Bookwiz does more of the journey in one place.
Check your KDP royalties free — no account needed — then let Bookwiz draft, format, and list the whole book.
Start writing freeLast updated: June 2026
Comparison reflects publicly available information as of mid-2026.