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

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2 tools matching “live”

Folderly Lens

▲ 1

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.

No login Developerfolderly.com

regex101

▲ 1

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.

No login Developerregex101.com