Free responsive website checker for mobile, tablet and desktop
Free network diagnostic tools for DNS, IP, email and SSL checks
Stage
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Founded
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Based in
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IN
Pricing model
Free
Freemium
Pricing
Not given
Free plan: All 41 tools with unlimited checks, 3 saved domains with daily monitoring, 7 days of history. Pro plan: $29/month for 50 domains, scans every 6 hours, email, Slack, Telegram and webhook alerts, 12 months of history and API access.
Key features
Test multiple device viewports simultaneously
Real CSS viewport rendering
Share setup links
Custom pixel width testing
No installation required
Sync scroll across panes
Browser-based with no account needed
DNS Lookup - resolve A, AAAA, MX, TXT, NS, CNAME records
Blacklist Checker - query 7 major DNS blocklists
SSL/TLS Certificate Checker - verify certificate chain, expiry and protocol support
Email Deliverability - check SPF, DKIM and DMARC records
WHOIS Lookup - query domain registration details
Reverse DNS (PTR) - check IP to hostname resolution
Port Checker - test common HTTP/HTTPS ports
BIMI Lookup - query BIMI TXT records
Domain monitoring with automated scans
Multi-channel alerts via email, Slack, Telegram and webhooks
What makes it different
Compare multiple real device widths side by side instead of switching one at a time
Faster than DevTools for checking several device sizes at once
Entirely browser-based with no setup, signup or download
Built and maintained by one developer in the open
41 tools all available free with unlimited checks
Clear sourcing - every result shows its source and what was not tested
Live DNS queries from edge servers via DNS-over-HTTPS
Domain monitoring and alerts with affordable Pro plan at $29/month
Responsive Tool
The Network Tools