Page change alerts

Know the moment
a web page changes.

Restocks, price drops, appointment slots, job posts, policy updates. Paste a URL and DiffBell checks it for you, then rings by email, Discord, Slack, phone push or webhook.

Phone push: install the free ntfy app (iOS/Android) and subscribe to the same topic name you type here. Pick something hard to guess.

No password. Free for 5 pages. We'll check right away and save a baseline.

1

Paste a link

Any public page. Watch the whole page, a CSS selector, or one phrase like In stock.

2

We keep checking

Every 10 minutes on Pro, daily on Free. We strip ads and scripts, so you only hear about real content changes.

3

Your bell rings

You get exactly what was added and removed, wherever you want it.

🔔 store.example.com changed · 2 lines added, 1 removed
- Currently unavailable. We don't know when this item will be back.+ In stock. Only 3 left — order soon.+ Price: $499.00

Diffs, not screenshots to squint at.

Each alert shows exactly which lines appeared and disappeared, so you can tell in a second whether to act.

  • Every alert channel on every plan, Free included
  • Keyword triggers: ring only when "Sold out" disappears
  • CSS selectors to ignore noisy footers and sidebars
  • Full change history for every page

Priced like a utility, not an enterprise suite.

Other tools charge $10–15/month for a handful of pages. DiffBell Pro is $5/month for 50 pages checked every 10 minutes. See pricing →