Ace by DAISY

Free plan

What the maker publishes

Audience

DAISY describes Ace as suitable for publishing teams, third party vendors, self publishing authors, and others testing EPUB files without digital rights management. source

Automated scans

Yes source

Automated tests

Ace runs automated accessibility tests on EPUB content documents. source

Browser extension

No source

CI/CD integration

Yes source

Current release

The Ace documentation identifies version 1.4.6 as the latest version. source

Desktop app

The official graphical app is available for Windows, macOS, and Linux, with installers for Intel and some ARM devices. source

Founded

1996 source

Free plan

Yes source

Headquarters

Zurich, Switzerland source

Interfaces

Ace can be used as a command line tool, a JavaScript Node module, or through an HTTP API. source

Knowledge base

The desktop app provides links to a local offline version of the DAISY Knowledge Base and an option to open its online version. source

Languages

The desktop app settings currently offer English and French. source

Maintenance terms

DAISY’s software terms say it has no obligation to provide maintenance, support, or updates for the software. source

Manual review tools

Yes source

Mobile testing

No source

Purpose

Ace checks EPUB files for accessibility at any point in a publishing workflow and assists with evaluating conformance to the EPUB Accessibility Specification. source

Remediation guidance

Yes source

Report export

The desktop app can export a report as a ZIP archive and rerun the evaluation. source

Reports

Ace generates an HTML report covering violations, metadata, document outlines, and images. source

Security and privacy

The command line documentation says Ace requires a modern Node.js runtime for security and performance reasons. source

Support

DAISY provides Ace support resources, including troubleshooting, FAQs, and contact links. source

Technical requirements

The command line tool requires Node.js 20 or later, with Node.js 22 recommended; its stated operating system requirements include Windows 10+, macOS High Sierra 10.13+, and 64-bit Linux distributions. source

WCAG coverage

other standard source

Checked against the maker's pages on 11 Oct 2026.