Nibbler is a basic free website checker. PageGuard adds Core Web Vitals, WCAG 2.1 AA accessibility scoring, automated monitoring, and a multi-site dashboard — all the features Nibbler lacks.
ADA Title II Deadline: April 24, 2026
State and local government websites must meet WCAG 2.1 AA. Nibbler does not provide WCAG 2.1 AA scoring or continuous ADA compliance monitoring. PageGuard monitors accessibility continuously — alerting you before violations occur.
| Feature | PageGuard | Nibbler |
|---|---|---|
| Pricing | Free + from $9/mo | Free (basic) — no paid monitoring tier |
| Who is it for? | Small businesses, designers, agencies — automated site health monitoring | Bloggers and hobbyists doing a quick one-time website check |
| Free tier | ✓ Yes — unlimited one-off scans, no signup required | Yes — limited free checks, registration required for full report |
| Accessibility audit (WCAG / ADA) | ✓ Yes — WCAG 2.1 AA scored 0–100 with specific issue list | Basic accessibility hints only, no WCAG 2.1 AA scoring |
| Technical SEO audit | ✓ Yes — meta tags, headings, canonical, structured data | Basic SEO checks (title, description, headings) |
| Performance audit (Core Web Vitals) | ✓ Yes — LCP, CLS, FCP scored 0–100 | No — no Core Web Vitals measurement |
| Social media analysis | No | ✓ Yes — checks Facebook/Twitter integration and share counts |
| Technology detection | No | ✓ Yes — detects CMS, frameworks, analytics tools |
| Automated site monitoring | ✓ Yes — weekly or daily scans, email alerts on score drop | No — one-off scan only, no scheduled monitoring |
| Email alerts on score regression | ✓ Yes — notified when performance, SEO, or a11y drops | No — no ongoing monitoring or alerts |
| AI-generated plain-English report | ✓ Yes — explains issues in non-technical language | No — scored categories only, no AI interpretation |
| Dashboard (multi-site) | ✓ Yes — manage and monitor up to 50 sites | No — single URL checks only |
| Shareable report URL | ✓ Yes — public link, no login required to view | Limited — report page accessible after scan |
| ADA Title II compliance monitoring | ✓ Yes — WCAG audit + alert on accessibility regression | No — no ADA compliance monitoring or scoring |
| REST API | ✓ Yes — available on Pro ($29/mo) and Agency ($79/mo) plans | No — no public API |
Performance + Accessibility + SEO + Best Practices in 30 seconds. No Nibbler account needed.
Results in ~30 seconds. 4 scores: Performance, Accessibility, SEO, Best Practices.
For website health monitoring and ADA compliance, yes. PageGuard provides Core Web Vitals performance scoring, WCAG 2.1 AA accessibility compliance tracking, automated monitoring with email alerts, and a multi-site dashboard — all features Nibbler lacks. Nibbler is better for one-off snapshots that include social media and technology detection. Use PageGuard when you need continuous monitoring and ADA compliance coverage.
Nibbler includes basic accessibility hints but does not provide WCAG 2.1 AA compliance scoring or continuous monitoring with email alerts. With the ADA Title II deadline on April 24, 2026, websites need dedicated accessibility tracking. PageGuard provides WCAG 2.1 AA scoring on a 0–100 scale and alerts you whenever accessibility regresses.
Yes — PageGuard is completely free for one-off website health scans with no account or credit card required. Unlike Nibbler, PageGuard also offers automated monitoring from $9/month — scanning your sites weekly or daily and emailing you when performance, SEO, or accessibility drops. You can also manage multiple sites from a single dashboard.
Nibbler uniquely checks social media integration (Facebook likes, Twitter followers) and detects what CMS or technology stack a website uses. PageGuard focuses on performance health (Core Web Vitals), accessibility (WCAG 2.1 AA), technical SEO, and best practices — with continuous monitoring and email alerts. For most site owners, PageGuard’s coverage is more actionable.