Weird web tools that do one job well.
A curated list — every tool here was tried by a real human before being posted. Sites with obtrusive ads, or without at least a free demo, get rejected.
- ✓ Curated by hand, not scraped
- ✓ Tried by a real human first
- ✓ No obtrusive ads
- ✓ Free demo at minimum
4 tools
Paste a domain and get an email-deliverability health verdict: DNS records, SPF/DKIM/DMARC authentication, and blacklist signals — in the browser, no signup, no mailbox access, no test sends.
Build and debug regular expressions with live matching, an explanation panel that decodes every token, and a searchable reference. Supports PCRE, JavaScript, Python, and more flavors.
Type a cron expression and see it translated into plain English, with the next scheduled runs. The fastest way to double-check that '0 4 * * 2' means what you think it means.