Free & open

Free Publishing Tools

Practical tools for publishers, editors, and content creators. Validate your EPUBs, check accessibility, estimate savings — all free, all instant.

For everyone

Universal tools that work for any catalog or content team.

EPUB Checker

Validate your EPUB files for structure, metadata, content integrity, and best practices. Get a quality score and detailed issue report.

Check your EPUB

EPUB Accessibility Checker

Check your EPUB files for accessibility issues, WCAG conformance, alt text, language markup, heading structure, ARIA roles, and more.

Check accessibility

Ebook-Preisrechner

Erhalten Sie eine datenbasierte Preisempfehlung für Ihr Ebook — basierend auf Genre, Länge, Verlagsstufe, Autoren-Erfolgsbilanz und Zielmarkt.

Preis berechnen

2026 U.S. Marketing Calendar

Über 120 wichtige Termine und Kampagnenideen für die US-Buchbranche. Feiertage, literarische Veranstaltungen, Preisverleihungen, Festivals und mehr.

Kostenlosen Kalender herunterladen

For authors

Tools for indie authors and self-publishers deciding where to sell.

Explore the Authors solution →

Author Royalty Calculator

Compare what you earn per book on Amazon KDP, Apple Books, Kobo, Google Play and a direct-to-consumer storefront — side by side, annual projection.

Calculate earnings

Self-Publishing Readiness Assessment

Eight short questions, a 0-100 readiness score, and three personalized next steps for indie authors deciding between KDP, marketplaces, and direct-to-consumer.

Take the assessment

For publishers

Model revenue and margins for trade and digital-first publishers.

Explore the Publishers solution →

Publisher Revenue Calculator

Estimate how much more revenue a trade or digital-first publisher keeps by adding a direct channel alongside Amazon and retail distribution.

Calculate revenue

For university presses

Tools for academic publishers building a direct-to-consumer channel.

Explore the University Presses solution →

University Press ROI Calculator

Model the impact of shifting university press sales from Amazon and institutional channels to a direct-to-consumer storefront. Keep 85% vs 35%.

Calculate ROI

D2C-Reifegrad-Bewertung

Bewerten Sie die digitale Reife Ihres Universitätsverlags in 5 Schlüsselbereichen. Erhalten Sie einen personalisierten Score, Benchmarks und umsetzbare Empfehlungen.

Bewertung starten