FreeISBN
Depends
Confidence: Medium
Reasonable fit for budget self-publishers who need an ISBN cheaper than Bowker's $125 and plan wide distribution.
New check
Comparison
FreeISBN vs 404
FreeISBN and 404 both land on Depends.
404
Depends
Confidence: Low
Indie authors who want Amazon's store, print-on-demand, and Kindle Unlimited payouts use KDP, and publishing is free to start.
| Compare | 404 | |
|---|---|---|
| Verdict | Depends | Depends |
| Best for | Budget self-publishing authors | Indie authors self-publishing ebooks and paperbacks |
| Who it's not for | Authors wanting their own imprint as publisher of record | Authors who want Apple, Kobo, and library sales in one dashboard |
| Privacy | No known public vulnerabilities found in the sources reviewed; one scanner flags unverified social links.⁴ | No known public vulnerabilities found in the sources reviewed.12 |
| Support quality | No public evidence found | No support evidence found. |
| Public sentiment | Review pages exist on Trustpilot and ProvenExpert, but public sources surface no detailed verbatim user feedback.³ | Retrieved review and forum sources discuss other products named '404', not this product. |
| Biggest gotcha | Guess: Resold ISBNs may carry the reseller's imprint as publisher of record, not yours . confirm first.⁹ | Guess: KDP Select requires 90-day Amazon exclusivity for Kindle Unlimited royalties.11 |
Pick FreeISBN when
- Budget self-publishing authors
- Authors avoiding Bowker's $125 single-ISBN price
- Indie presses needing multiple cheap ISBNs
- Wide-distribution authors avoiding store lock-in
When FreeISBN is not a fit
- Authors wanting their own imprint as publisher of record
- Anyone wanting a truly free ISBN . use KDP or Draft2Digital
- Buyers requiring security-vetted vendors (scanner-flagged site)
- Traditional publishers . buy direct from the official agency
Pick 404 when
- Indie authors self-publishing ebooks and paperbacks
- Writers seeking Kindle Unlimited page-read income
- First-time authors testing a book with zero upfront cost
- Authors wanting print-on-demand without inventory
When 404 is not a fit
- Authors who want Apple, Kobo, and library sales in one dashboard
- Writers unwilling to give Amazon 90-day exclusivity for Kindle Unlimited
- Publishers wanting editing, cover design, or marketing services
- Anyone shopping for a store or CRM: KDP publishes books, not software
Sources
official
- FreeISBN Reviews & Experiences (ProvenExpert)provenexpert.comreview
- Trustpilot reviews of freeisbn.comtrustpilot.comreview
security
- Cost of ISBN in 2026: $125 Single vs $295 for 10-Packalpacaauthors.comnews
- The Best Consulting Companies . Jul 2026 (The Manifest)themanifest.comnews
news
- Draft2Digital Formatter Review (2026)bookbird.ioreview
official
- Amazon KDP homepagekdp.amazon.comofficial
- Product security pagekdp.amazon.comofficial
