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A11y Pulse vs Pa11y

Pa11y, without the server. That's A11y Pulse.

Pa11y is do-it-yourself open source software. A11y Pulse is the managed alternative for teams who want more detailed dashboards, better stakeholder reporting, and none of the operational overhead. Set up in five minutes, with reporting and alerts included.

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What is Pa11y?

Pa11y is a family of open-source projects maintained by the Pa11y team and released under LGPL-3.0. The CLI, the CI runner, and the self-hosted dashboard cover most of what a small team needs from automated accessibility testing, provided they have the appetite to operate a Node service and a MongoDB instance.

pa11y CLI Command-line tool

Point it at a URL, get accessibility issues printed to your terminal or written to JSON. Sensible per-page check before merging.

Pa11y CI Build-pipeline runner

Runs pa11y against a list of URLs and produces consolidated output. The variant most teams reach for in CI.

Pa11y Dashboard Self-hosted web app

Stores results in MongoDB, runs scheduled retests, graphs progress over time. Similar to A11y Pulse, but hasn't seen much active development recently.

Why teams switch to A11y Pulse

Three things you get when the accessibility monitoring is hosted

The Pa11y projects are free. The cost shows up everywhere else, in the server, the database, the missing alerting layer, and the time someone spends keeping it all patched.

1

Operations

No server to keep running

Pa11y Dashboard needs Node, MongoDB, headless Chromium for SPA testing, a cron, and someone to upgrade all of it. A11y Pulse is the version where that operational tax is included in the price.

Five-minute setup

2

Continuity

Always on, not only on commit

Pa11y CI runs when code changes. Most accessibility regressions arrive through routes that don't trigger a build, like a CMS edit, a third-party script update, or a content upload. A11y Pulse watches between releases.

Daily, every page

3

Reporting

Reports stakeholders can read

Pa11y Dashboard graphs issue counts. A11y Pulse does that, but adds monthly email digests, Slack and Teams alerts, and PDF reports your non-technical stakeholders can actually read.

Reports and alerts, built in

Where we fit

The same engine, on a hosted schedule

A11y Pulse runs axe-core daily across your full sitemap, so the underlying findings line up with Pa11y configured for axe. The difference is everything around the engine, including scheduling, multi-page coverage, history, deduplication, alerting, and the stakeholder report, that Pa11y leaves to you to build on top of the dashboard.

  • Axe-core daily across your full site, in real Chromium
  • Authenticated flows via scripted login, not a fiddly actions API
  • Email, Slack, and Microsoft Teams alerts when something regresses
  • MCP server so Claude and Cursor can query your scan results directly and fix your issues
The A11y Pulse dashboard showing daily scan results across multiple pages with a 30-day trend chart.

Side by side

A11y Pulse vs Pa11y

Pricing
Setup time
Default engine
Page discovery
JS-rendered pages
Authenticated pages
Scheduling
Regression alerts
Stakeholder reports
MCP server
Best for
A11y Pulse Continuous, site-wide
Recommended
$19 USD/month Hosted, monthly billing
About 5 minutes No maintenance required
axe-core No config needed
Sitemap, crawl, or URL list
Real Chromium No config needed
Scripted login flow Scripted once, runs every scan
Daily, with unlimited rescans
Email, Slack, Teams
PDF report and monthly email
Included Query scan results from Claude, Cursor, and other AI tools
Teams who want testing without operating it
Pa11y Open-source CLI
For comparison
Free Plus server + database costs
An afternoon Plus ongoing maintenance
HTML CodeSniffer axe-core available with config
Manual URL list
Supported Requires configuration
Pa11y actions API More fiddly to maintain
Configurable in dashboard cron
Build it yourself
Build it yourself
Not available
Teams with engineering capacity to self-host

Pa11y figures reflect the open-source projects at pa11y.org. Self-hosting carries server, database, and maintenance costs that vary by environment.

A note on the engine

Same engine, different shape around it

If your sole requirement is "run axe-core against a URL", Pa11y does that for free. Both tools can drive axe-core; the underlying issue list for a given page should be substantially similar. The comparison isn't about the engine.

The comparison is about everything around the engine. Pa11y Dashboard graphs issue counts and runs scheduled retests, but multi-site reporting is light, alerting isn't built in, and there's no email digest format you'd send to a non-technical client. The patterns Pa11y leaves to you to build, alerting, multi-site rollups, stakeholder PDFs, deduplication across pages, are the patterns A11y Pulse ships with.

A common pattern in practice: keep Pa11y CI as a CI-time gate and use A11y Pulse for production monitoring. Pa11y catches regressions before they merge; A11y Pulse catches the rest. Your team only sees alerts for issues that made it into production.

The verdict

When each tool is the right call

Choose

A11y Pulse

  • You want continuous monitoring without operating a server
  • You manage multiple sites and want a single reporting view
  • You need stakeholder-facing reports and Slack or Teams alerts out of the box
  • Your team doesn't have spare capacity for accessibility devops
  • You want pages behind a login tested with a sensible scripting model
  • You'd rather pay $19/month than spin up a VPS, MongoDB, and a cron

Choose

Pa11y

  • You're happy operating Node and MongoDB and want full control over the stack
  • Your primary use case is a per-page check inside CI, not monitoring
  • You have a strong preference for self-hosted, on-premises tooling
  • You only need to test a small, stable list of URLs
  • The DIY route is part of your team's comfort zone

Common questions

You asked.
We answered.

Still curious? Read the docs or email us.

No. A11y Pulse is a hosted commercial product. The trade-off is that there is nothing to install, no Node.js version to manage, no MongoDB to back up, and no scheduled jobs to monitor. The accessibility testing engine A11y Pulse uses (axe-core) is open source and is the same engine Pa11y can be configured to run.

The information presented here about A11y Pulse and Pa11y is provided for comparison purposes and may change over time. Pricing and feature claims about Pa11y should be verified on their own website before making a purchasing decision.

Accessibility monitoring that runs itself

30-day free trial. First scan tonight, no Node version to manage, no MongoDB to back up.

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