Foglift vs Nibbler
Nibbler gives a quick 10-point score across accessibility, SEO, social, and technology. Foglift goes deeper with GEO analysis, security grading, API access, PDF export, and 29 standalone tools — all free.
| Feature | Foglift | Nibbler |
|---|---|---|
| Price | Free forever | Free (no signup required) |
| GEO / AI search analysis | ✓ 7-check GEO score | ✕ Not available |
| AI crawler detection | ✓ GPTBot, ClaudeBot, etc. | ✕ Not checked |
| Pages scanned per test | 1 page (deep analysis) | Up to 5 pages (shallow) |
| SEO audit | ✓ Full SEO score with A-F grades | ✓ Basic SEO checks (0-10) |
| Accessibility audit | ✓ 15 WCAG checks | ✓ Basic accessibility score (0-10) |
| Security headers | ✓ 6 headers + security grade | ✕ Not checked |
| Social media presence | ✕ Not checked | ✓ Social media presence score |
| Technology detection | ✕ Not a focus | ✓ Technology stack detection |
| Schema/structured data | ✓ JSON-LD depth analysis | ✕ Not analyzed |
| Performance audit | ✓ Core Web Vitals via PageSpeed API | ✓ Basic experience score |
| Standalone tools | 29 free tools | ✕ Single test only |
| PDF export | ✓ Branded PDF report | ✕ Not available |
| API access | ✓ Free REST API | ✕ No API |
| MCP server | ✓ For AI coding assistants | ✕ Not available |
| Blog / guides | 46+ SEO + GEO guides | ✕ No educational content |
| Competitor comparison | ✓ Side-by-side site comparison | ✕ Single site only |
| Monitoring/tracking | Pro plan: weekly monitoring | ✕ One-time test only |
Choose Foglift when...
- ✓You want to know how your site performs in AI search (ChatGPT, Perplexity, Google AI Overviews)
- ✓You need security header analysis and an overall security grade
- ✓You want standalone SEO tools (robots.txt generator, schema generator, etc.)
- ✓You need API access for automated or programmatic scanning
- ✓You want a downloadable PDF report to share with clients or teammates
- ✓You want to compare two websites side by side
Choose Nibbler when...
- →You want a quick multi-page crawl (up to 5 pages tested at once)
- →You need a social media presence check across platforms
- →You want technology stack detection for your site
- →You prefer a simple 0-10 scoring system at a glance
- →You need a zero-signup, instant test with no account required
The GEO Gap: What Nibbler Misses
Nibbler was designed for a simpler web. It checks traditional SEO basics, social media presence, and technology stacks. But in 2026, AI-powered search engines like ChatGPT, Perplexity, Google AI Overviews, and Claude are driving a growing share of traffic and citations.
Foglift's GEO score checks 7 factors that determine whether AI search engines can find, understand, and cite your content:
- • AI Crawler Access — Are GPTBot, ClaudeBot, and PerplexityBot allowed in robots.txt?
- • Structured Data Depth — Does your schema markup provide enough context for AI extraction?
- • FAQ Detection — Do you have FAQ sections that AI can directly cite?
- • Entity Markup — Are key entities (people, organizations, products) marked up?
- • Content Structure — Is your content organized with clear headings for AI parsing?
- • Citation Formatting — Are statistics and claims formatted for AI quotation?
- • Meta Quality — Are your meta tags descriptive enough for AI summarization?
Depth vs Breadth: Scoring Approaches
Nibbler gives each category a score from 0 to 10 across Accessibility, Experience, Marketing, and Technology. It's a useful quick snapshot, but the checks behind each score are relatively shallow — you get a number but limited actionable guidance on how to improve.
Foglift uses A-F letter grades with detailed breakdowns per category. Each score comes with specific findings — which security headers are missing, which structured data types are detected, which AI crawlers are blocked — and actionable steps to improve each one.
Nibbler's multi-page crawl (up to 5 pages) gives it a broader view of a site, while Foglift goes deeper on a single page. If you need breadth, Nibbler is useful as a starting point. For depth and modern analysis, Foglift fills the gaps.
Security Headers: A Blind Spot for Nibbler
Nibbler does not check security headers at all. Foglift audits 6 critical HTTP security headers and assigns an overall security grade:
- • HSTS (HTTP Strict Transport Security)
- • X-Content-Type-Options
- • X-Frame-Options / CSP frame-ancestors
- • Content-Security-Policy
- • Referrer-Policy
- • Permissions-Policy
The Bottom Line
Nibbler is a handy free tool for a quick multi-page snapshot with social media and technology checks. Foglift goes much deeper with GEO analysis, security grading, API access, PDF export, and 29 standalone tools. For modern website optimization — especially AI search readiness — Foglift covers the dimensions Nibbler doesn't touch.