Catch the failures your uptime monitor misses.
GrabDiff watches your site with a real browser. We screenshot every page on a schedule, diff it pixel-by-pixel against a known-good baseline, and alert you the moment something looks wrong — even when your server still returns 200.
No credit card. Cancel anytime.
Visual diffs
Every URL is captured with headless Chrome at 1280×900, then diffed pixel-by-pixel. Threshold tuneable from 0.1% to 10%.
Cert & domain expiry
We watch your TLS chain and your registration. Get pinged at 30, 14, 7, and 1 days out.
Cron heartbeats
Unique inbound URLs for every job. We alert when a scheduled task forgets to phone home.
Pricing
Free
$0
- 3 monitors
- 30 min interval
- 14 days history
Solo
$9/mo
- 20 monitors
- 5 min interval
- 90 days history
Pro
$29/mo
- 50 monitors
- 1 min interval
- 365 days history
- Webhook alerts