TLDR
Siteimprove is a comprehensive platform for in-house digital teams — accessibility bundled with SEO, analytics, and content quality at enterprise pricing. axe DevTools Pro is a developer-focused scanner priced at $40-$100/user/month. One is overkill for accessibility auditing alone; the other requires a per-developer seat at every client engagement.
| Feature | Siteimprove | axe DevTools Pro | A11yProof |
|---|---|---|---|
| Monthly cost | Custom enterprise | $40-$100/user/mo | from $29/month |
| Approach | Overlay/Enterprise | Overlay/Enterprise | AI scanning + code fixes |
| Feature | Siteimprove | axe DevTools Pro | A11yProof |
|---|---|---|---|
| Starting price | Custom enterprise quote | $40-$100/user/mo | $29/mo (up to 25 sites on Agency) |
| Target user | In-house digital/marketing team | Individual developer | SMBs and agencies |
| Multi-client management | Not native | Not native | Yes — multi-client dashboard (Agency tier) |
| White-label client reports | No | No | Yes (Agency tier) |
| WCAG criterion mapping | Yes | Yes (detailed) | Yes — per-violation with code fixes |
| Browser extension | No | Yes (core feature) | No — web dashboard |
| Scheduled site monitoring | Yes | No (manual scans) | Yes — scheduled scans (Pro and Agency) |
| Accessibility + SEO + content quality | Yes (bundled) | Accessibility only | Accessibility only |
Two Different Tools for Two Different Jobs
Siteimprove and axe DevTools solve accessibility problems from opposite directions.
Siteimprove monitors sites continuously, scoring them against WCAG criteria and tracking compliance trends over time. It is the tool a director of digital experience uses to keep their organization’s web presence on track. The accessibility module is one part of a platform that also manages SEO, content quality, analytics, and broken links.
axe DevTools is what a developer uses while writing code. The browser extension flags WCAG violations inline, the IDE plugin flags issues in code, and the API can run in a CI/CD pipeline to catch regressions before they deploy. It is a developer aid, not a monitoring platform.
Why Neither Fits Agency Client Work Cleanly
Agency accessibility work happens at the intersection of both use cases: you need to scan client sites before launch (like axe DevTools) and monitor them post-launch (like Siteimprove), but you need to do this for multiple clients with separate reporting for each.
axe DevTools doesn’t have a multi-client view. Each developer scans sites individually. There’s no centralized client dashboard or white-label report generation.
Siteimprove doesn’t have multi-client billing or client-deliverable reporting. It is built for an in-house team managing the organization’s own presence.
A11yProof is designed specifically for the agency model: one account, all client sites, centralized health tracking, and white-label reports that agencies can include in project deliverables.
What Each Tool Does Best
For agencies that want developer-level WCAG detail during active development, axe DevTools (including the free browser extension) is the right tool for that specific task. For ongoing client monitoring after launch, you need something that handles multiple clients in a single view with scheduled scans and client-facing reporting.
Neither option feel right?
Most small businesses pay for accessibility features they don't need. A11yProof starts at from $29/month.
See plans & pricingVerdict
Siteimprove monitors at the business level. axe DevTools tests at the developer level. Agencies need both capabilities — business-level client reporting and developer-level fix guidance — but neither tool provides both. A11yProof combines scanning with production-ready fixes in a single workflow.
PROS & CONS
Siteimprove
Pros
- Comprehensive digital quality platform — not just accessibility
- Scheduled automated scans across managed properties
- Strong WCAG scoring and compliance trend reporting
- Used by government and enterprise compliance teams
Cons
- Custom enterprise pricing, no transparent rates
- Not designed for multi-client agency structure
- Pays for SEO, analytics, and content tools even if only accessibility is needed
- Annual contracts with minimum commitments
PROS & CONS
axe DevTools Pro
Pros
- Developer-first tool with deep WCAG criterion coverage
- Browser extension fits naturally into developer workflow
- Open-source axe-core engine is trusted across the industry
- Integrates with CI/CD for automated testing in build pipelines
Cons
- Per-user pricing compounds with team size
- No multi-client dashboard or client reporting
- Designed for individual developers, not agency-level portfolio management
- Manual scan initiation — no ongoing monitoring without CI integration
Q&A
What is the main difference between Siteimprove and axe DevTools for accessibility?
Siteimprove is a platform play — accessibility is one module in a broader digital quality suite that includes SEO, content, and analytics. It's designed for an in-house team managing a single organization's presence. axe DevTools is developer-tooling — a browser extension and API that gives individual developers detailed WCAG feedback during development. One monitors, the other assists remediation. Neither handles multi-client agency work natively.
Q&A
Can axe DevTools free version replace axe DevTools Pro for agency work?
The open-source axe-core (the underlying engine) and the free browser extension cover a meaningful subset of WCAG violations. axe DevTools Pro adds guided testing, deeper rule coverage, and integrations with CI/CD pipelines. For agencies that have developers already using axe-core, Pro is an upgrade worth evaluating. The per-user pricing still applies.
Frequently asked