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
6 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.
Point any plain HTML form at it and submissions arrive in your email — with attachments, logs, exports, spam controls, and API access. The free plan is the real production setup, so you can test before paying.
Simulate your architecture on AWS, GCP, Azure, OCI, or DigitalOcean and forecast cost, performance, and resilience — without provisioning a single real resource. Free, with an API.
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.