Pa11y vs axe DevTools
Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.
Entry price
Free and open source
Open sourceFree tier available
Free tierWhat drives the bill
The metric that actually scales your invoice.
Free and open source. You pay in engineering time and CI minutes.
The free extension covers a lot. Deque no longer publishes a price for Pro or the axe DevTools for Web bundle — both route through sales or a no-card trial, so budget from a quote rather than a list price.
Free tier
Everything, self-hosted
Free browser extension with the core axe-core rule set.
Open source
LGPL-3.0
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Established
OSS community · since 2013
Widely used
Deque Systems · since 2015
Strengths
- Free, scriptable and trivially added as a CI gate.
- Tests a sitemap of URLs in one run, unlike page-by-page extensions.
- Self-hosted dashboard for tracking without a vendor.
- Guided manual testing addresses the two thirds of WCAG that scanners cannot.
- Findings come with concrete code-level remediation advice.
- Deque's accessibility expertise is the deepest in the industry.
Limitations
- No guided manual testing or remediation workflow.
- Testing authenticated or interactive states requires scripting actions.
- Maintenance activity has been intermittent.
- Per-seat pricing adds up across a large engineering organisation.
- The free extension is good enough for many teams, blurring the upgrade case.
- Enterprise deployment needs process design, not just a licence.
Best for
Teams wanting free automated accessibility gates across many pages.
Organisations with a formal accessibility programme and compliance obligations.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.