Web & SEO tools
25 web & seo utilities — 18 live so far.
18 of 25 live · the rest ship in waves, each unit-tested in public.
Web, SEO & network25
- CIDR calculator
Subnets, ranges, masks
- CSR / certificate decoder
Paste PEM, read every detail
- DNS lookup
A, AAAA, MX, TXT, NS, CNAME via DNS-over-HTTPS
- Email address validator
Syntax, MX via DoH, disposable-domain list
- Email header analyzer
Trace the received path and auth results
- Favicon generator
Every size plus manifest from one image
- hreflang generator
Multi-language tag sets
- HTTP header inspector
Response headers with a security grade
- JSON-LD generator
Organization, FAQ, Article, LocalBusiness schema
- Keyword density checker
On-page term frequency
- Meta tag generator
Title, description, OG, Twitter boilerplate
- Meta tag previewer
Google SERP plus WhatsApp / LinkedIn / X card preview
- QR code generator
URL, text, WiFi, vCard with logo and SVG export
- QR scanner
Decode from camera or image
- Redirect tracer
Follow 301/302 chains hop by hop
- robots.txt tester
Parse rules, test URLs against them
- SERP pixel checker
Title and description truncation preview
- Sitemap validator
Paste or upload, check URLs and structure
- SPF/DKIM/DMARC checker
Email deliverability records, explained plainly
- SSL certificate checker
Expiry, chain, SANs for any domain
- URL parser
Decompose and rebuild URLs, edit query params
- User-agent parser
Browser, OS, device from a UA string
- UTM builder
Campaign URLs with saved presets
- What is my IP
IP, ASN, rough location
- WHOIS lookup
Domain registration data