Foglift
All Comparisons
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 | Growth plan: daily 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.
Frequently asked questions
What is the main difference between Foglift and Nibbler?
+
Nibbler offers a quick multi-page crawl with simple 0-10 scoring. Foglift provides deeper single-page analysis with AI search readiness scoring, security headers audit, performance metrics, and actionable AI recommendations.
Is Foglift more affordable than Nibbler?
+
Foglift offers free unlimited Website Audits with no credit card required, and paid monitoring plans start at $49/mo. Nibbler starts at Free (no signup required). Foglift includes SEO analysis, AI Readiness scoring, API, CLI, and MCP access on all tiers.
Do Foglift and Nibbler both offer free plans?
+
Yes, both tools offer free options. Foglift provides free unlimited Website Audits with no signup and no credit card, including full SEO and AI Readiness scoring. Nibbler starts at Free (no signup required). Check each tool's website for current plan details.
Which is better for SEO and AI search optimization: Foglift or Nibbler?
+
Foglift combines traditional SEO auditing with AI search readiness scoring (GEO) in a single tool — something most competitors, including Nibbler, do not offer at this price point. If you need to understand how AI search engines like ChatGPT, Perplexity, and Gemini see your website, Foglift is purpose-built for that.
When should I choose Nibbler over Foglift?
+
Consider Nibbler if you need: quick multi-page crawl (up to 5 pages tested at once), social media presence check across platforms, technology stack detection. Nibbler is a strong choice for those specific use cases. Foglift is the better fit if you want free unlimited scans, combined SEO + GEO analysis, or developer tools (API, CLI, MCP).
How we compare
This comparison evaluates both tools across features, pricing, and AI search optimization capabilities. Our methodology draws on peer-reviewed research into what drives AI engine citations:
- Aggarwal et al., “How Search Engines Integrate AI Overviews,” KDD 2024 — found that structured data and entity clarity improve AI answer extraction rates.
- SE Ranking study of 129,000 domains (2025) — identified referring domains and brand web mentions as the strongest predictors of AI citations.
- Chatoptic correlation study (2025) — demonstrated only a 0.034 correlation between Google rank and ChatGPT citation, confirming AI visibility is an independent channel from traditional SEO.
- Zyppy freshness analysis (2025) — 71% of ChatGPT citations come from 2023–2025 content; pages updated within 30 days see a 3.2× citation lift.
Feature and pricing data is verified against each tool's public website. Last updated April 2026.