Comparison guide

BookIllustrationAI vs Colorify AI

Colorify AI makes good coloring pages at A4. Amazon KDP does not print A4, and Colorify’s $9.90 plan says in writing that it is not for commercial use. Here is the honest breakdown.

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BookIllustrationAI

Built for KDP publishers. Describe a theme, generate 40+ consistent pages and a full cover, and export a KDP-ready PDF at 300 DPI, at a real Amazon trim size with the 0.125-inch bleed already applied.

Best for: publishing coloring books on Amazon KDP

Colorify AI

A fast, cheap coloring page generator with high-resolution A4 output and no watermark on any plan. Commercial use starts at the $29.90 Plus plan, and everything past the image itself, trim, bleed, cover, and PDF assembly, is left to you.

Best for: home, classroom, and therapy printables

The A4 problem, in one paragraph

A4 is 8.27 by 11.69 inches. Amazon KDP’s paperback trim sizes are US-imperial: 8.5 by 11, 8 by 10, 6 by 9, and so on. They are not the same shape, so an A4 page cannot be dropped into a KDP interior as-is. You either scale it and lose the margins, or crop it and lose part of the artwork, and either way you still have to add 0.125 inches of bleed on every side afterwards. This is why Colorify’s higher 480 DPI figure does not settle the question: resolution only matters once the page geometry is right.

Feature comparison

Feature	BookIllustrationAI	Colorify AI
Purpose	Full KDP book publishing workflow	Individual coloring page images
Output format	KDP-ready PDF (300 DPI, bleed, trim)	Image files, A4 proportions
Page size	6 KDP trim sizes (8.5x11, 8x10, 6x9, 8.5x8.5, 5.5x8.5, 5x8)	A4 (8.27 x 11.69 in), not a KDP trim size
Print resolution	300 DPI at KDP trim size	4K / 480 DPI at A4
KDP bleed (0.125 in)
Commercial rights	All plans, granted in the terms of service	Plus ($29.90/mo) and Pro only
Free tier / cheapest plan usable for selling	Starter $39/mo, commercial use included	No. Free is personal use, Basic $9.90 "not for commercial use"
Style consistency across pages	Style fingerprint locks visual style	Each image generated independently
Batch generation	Builder and Publisher plans	Included on paid plans
Cover generator	Builder and Publisher plans
Spine width calculation
Blank back pages	Automatic (prevents marker bleed)	Manual in a PDF tool
Watermark	None	None
One-time credits without subscription		350 for $20, 1000 for $50
Advertised starting price	$39/month	$9.90/month (not for commercial use)
Price to legally sell on KDP	$39/month	$29.90/month (+ PDF and cover tools)

Colorify AI pricing, credit amounts, resolution, and commercial-use wording read from colorifyai.art/pricing on 4 September 2026. Plans change; check theirs before you buy.

BookIllustrationAI strengths

Generate a full 40-page book with cover in under 10 minutes
KDP-ready PDF at 300 DPI with correct trim, bleed, and blank back pages
Style fingerprint keeps every page in the book visually consistent
Commercial rights for every user, written into the terms of service

Colorify AI strengths

Cheaper entry price at $9.90/month, and a free tier for personal use
One-time credit packs with no subscription (350 for $20, 1000 for $50)
High-resolution 480 DPI output, and no watermark on any plan
A4 output is the right size for a European home printer

Choose BookIllustrationAI if you...

Want to publish coloring books on Amazon KDP
Need output already at a KDP trim size with bleed applied
Need 40+ pages that look like they belong in the same book
Want commercial rights without checking which plan you are on
Need a cover with correct spine width for your page count
Do not want to assemble PDFs manually

Start creating

Choose Colorify AI if you...

Want pages to print at home, for a classroom, or for therapy use
Print on A4 rather than US Letter
Only need single images, not a book
Want to pay once for credits instead of subscribing
Are not publishing to Amazon KDP

Verdict

Colorify AI is a genuinely good coloring page generator, and at $9.90/month with no watermark it is cheaper than anything purpose-built for KDP. If you are printing at home, it is the better buy and this page will not pretend otherwise.

For Amazon KDP the picture changes on two specifics. Their own pricing page says the $9.90 Basic plan is not for commercial use, so the price that makes Colorify attractive is not a price you can publish on; selling requires Plus at $29.90/month. And the output is sized for A4, which is not one of KDP’s trim sizes, so every page needs re-sizing and re-bleeding before Amazon will take the interior.

At that point you are paying $29.90/month and still supplying the PDF assembly, the trim correction, and the cover yourself. BookIllustrationAI is $39/month with the trim, the bleed, the cover, and the commercial licence already handled. The gap is $9, and what it buys is the part of the job that is not generating the image.

Frequently asked questions

What is the main difference between BookIllustrationAI and Colorify AI?: Colorify AI generates individual coloring page images sized for A4 printing. BookIllustrationAI generates a whole book: 40+ style-consistent pages plus a cover, exported as a KDP-ready PDF at 300 DPI, at an Amazon trim size with the required 0.125-inch bleed. Colorify is aimed at people who want a page to print at home. BookIllustrationAI is aimed at people uploading a manuscript to Amazon KDP.
Can I sell coloring books made with Colorify AI on Amazon KDP?: Only on their paid Plus or Pro plans. Colorify’s pricing page states that the Basic plan at $9.90/month "is not for commercial use", and the free tier is personal use only. Commercial rights begin at Plus, $29.90/month. So the cheap entry price most people quote is not the price you can actually publish on. BookIllustrationAI grants commercial rights to every user in its terms of service, with no plan gate.
Is Colorify AI’s 480 DPI output better than BookIllustrationAI’s 300 DPI?: More pixels, wrong shape. Colorify advertises 4K output at 480 DPI sized for A4, which is 8.27 by 11.69 inches. Amazon KDP does not offer A4 as a trim size for paperbacks. So an A4 page has to be re-cropped or re-scaled to a real KDP trim such as 8.5 by 11 inches, and bleed has to be added afterwards. 300 DPI at the correct trim size uploads cleanly; 480 DPI at the wrong page geometry does not. Resolution is only useful once the dimensions are right.
Does Colorify AI export a KDP-ready PDF?: No. Colorify produces image files. A KDP interior needs the correct trim size, 0.125-inch bleed on all sides, 300 DPI, blank reverse pages so markers do not bleed through to the next design, and a separate cover file whose spine width is calculated from the final page count. Assembling that from Colorify images means a PDF tool and a cover tool on top of the subscription. BookIllustrationAI does it on export.
Is Colorify AI cheaper than BookIllustrationAI?: At the entry tier, yes, and it is worth being straight about that. Colorify Basic is $9.90/month against BookIllustrationAI Starter at $39/month, and Colorify also sells one-time credit packs (350 credits for $20, 1000 for $50) with no subscription, which BookIllustrationAI does not offer. The comparison changes once you need to sell: Colorify’s commercially licensed plan is $29.90/month and still leaves you assembling the PDF, sizing to trim, and making a cover elsewhere.
Is Colorify AI a good choice for anything?: Yes. If you want printable coloring pages for your own kids, a classroom, or a therapy session, Colorify is cheap, fast, has no watermark on any plan, and A4 is the right size for a European home printer. It is a poor fit specifically for Amazon KDP publishing, which is a different job.

Pages that arrive at the right size

Generate 40 pages, create a cover, and export a print-ready PDF at a real KDP trim size. No re-cropping, no bleed maths.

Start creating See pricing

Last updated: September 2026

The A4 problem, in one paragraph

Feature comparison

Feature	BookIllustrationAI	Colorify AI
Purpose	Full KDP book publishing workflow	Individual coloring page images
Output format	KDP-ready PDF (300 DPI, bleed, trim)	Image files, A4 proportions
Page size	6 KDP trim sizes (8.5x11, 8x10, 6x9, 8.5x8.5, 5.5x8.5, 5x8)	A4 (8.27 x 11.69 in), not a KDP trim size
Print resolution	300 DPI at KDP trim size	4K / 480 DPI at A4
KDP bleed (0.125 in)
Commercial rights	All plans, granted in the terms of service	Plus ($29.90/mo) and Pro only
Free tier / cheapest plan usable for selling	Starter $39/mo, commercial use included	No. Free is personal use, Basic $9.90 "not for commercial use"
Style consistency across pages	Style fingerprint locks visual style	Each image generated independently
Batch generation	Builder and Publisher plans	Included on paid plans
Cover generator	Builder and Publisher plans
Spine width calculation
Blank back pages	Automatic (prevents marker bleed)	Manual in a PDF tool
Watermark	None	None
One-time credits without subscription		350 for $20, 1000 for $50
Advertised starting price	$39/month	$9.90/month (not for commercial use)
Price to legally sell on KDP	$39/month	$29.90/month (+ PDF and cover tools)

Colorify AI pricing, credit amounts, resolution, and commercial-use wording read from colorifyai.art/pricing on 4 September 2026. Plans change; check theirs before you buy.

Verdict

Frequently asked questions

What is the main difference between BookIllustrationAI and Colorify AI?

Colorify AI generates individual coloring page images sized for A4 printing. BookIllustrationAI generates a whole book: 40+ style-consistent pages plus a cover, exported as a KDP-ready PDF at 300 DPI, at an Amazon trim size with the required 0.125-inch bleed. Colorify is aimed at people who want a page to print at home. BookIllustrationAI is aimed at people uploading a manuscript to Amazon KDP.

Can I sell coloring books made with Colorify AI on Amazon KDP?

Only on their paid Plus or Pro plans. Colorify’s pricing page states that the Basic plan at $9.90/month "is not for commercial use", and the free tier is personal use only. Commercial rights begin at Plus, $29.90/month. So the cheap entry price most people quote is not the price you can actually publish on. BookIllustrationAI grants commercial rights to every user in its terms of service, with no plan gate.

Is Colorify AI’s 480 DPI output better than BookIllustrationAI’s 300 DPI?

More pixels, wrong shape. Colorify advertises 4K output at 480 DPI sized for A4, which is 8.27 by 11.69 inches. Amazon KDP does not offer A4 as a trim size for paperbacks. So an A4 page has to be re-cropped or re-scaled to a real KDP trim such as 8.5 by 11 inches, and bleed has to be added afterwards. 300 DPI at the correct trim size uploads cleanly; 480 DPI at the wrong page geometry does not. Resolution is only useful once the dimensions are right.

Does Colorify AI export a KDP-ready PDF?

No. Colorify produces image files. A KDP interior needs the correct trim size, 0.125-inch bleed on all sides, 300 DPI, blank reverse pages so markers do not bleed through to the next design, and a separate cover file whose spine width is calculated from the final page count. Assembling that from Colorify images means a PDF tool and a cover tool on top of the subscription. BookIllustrationAI does it on export.

Is Colorify AI cheaper than BookIllustrationAI?

At the entry tier, yes, and it is worth being straight about that. Colorify Basic is $9.90/month against BookIllustrationAI Starter at $39/month, and Colorify also sells one-time credit packs (350 credits for $20, 1000 for $50) with no subscription, which BookIllustrationAI does not offer. The comparison changes once you need to sell: Colorify’s commercially licensed plan is $29.90/month and still leaves you assembling the PDF, sizing to trim, and making a cover elsewhere.

Is Colorify AI a good choice for anything?

Yes. If you want printable coloring pages for your own kids, a classroom, or a therapy session, Colorify is cheap, fast, has no watermark on any plan, and A4 is the right size for a European home printer. It is a poor fit specifically for Amazon KDP publishing, which is a different job.