Alert delivery and automation
Route each detected change to Slack, Discord, email, or your own systems. Every channel receives the same reviewable record, with independent delivery status and retries.
Alert delivery
Pricing page changed
Slack
#pricing-watch
Delivered in 2s
audit@acme.com
Delivered in 4s
Webhook
200 OK
Delivered in 1s
Built into the monitoring workflow
Choose the channel that fits the response. Human review can happen in an inbox or chat, while structured change data moves into an automated workflow.
Put review-ready evidence in the conversations where your team already works.
Send change alerts directly to any Slack channel. Rich message formatting shows you exactly what changed with inline diffs and screenshots. Configure per-monitor routing to keep alerts organized across channels.
Get change notifications in your Discord server. Embed-style messages include change summaries, diff highlights, and direct links to detailed change views. Works with any Discord channel using webhook URLs.
Receive change alerts in your inbox. Email notifications include a clear summary of what changed, before/after comparisons, and links to the full change detail. Available on every plan, including free.
Move change data into your own systems or create monitors from the browser.
POST change data to any URL. Webhook payloads include the full change diff, monitor metadata, and timestamps. Build custom workflows in Zapier, Make, n8n, or your own backend. Includes retry logic and delivery logs.
Full programmatic access to OnChange. Create and manage monitors, retrieve change history, pull diffs, and configure alert rules through a well-documented REST API. Build dashboards, automations, and custom tooling.
Monitor pages directly from your browser. Right-click any page to start monitoring, use the visual CSS selector picker to target specific elements, and manage your monitors from the extension popup.
Capture or compare a public page before committing to continuous monitoring.
Capture a PNG of any public URL without setting up a monitor. Free, anonymous, 5 captures/min (60/min when signed in). JavaScript-rendered SPAs work out of the box. Every capture includes a one-click shortcut to turn the URL into a live change monitor.
Check if any public web page changed, without setting up a monitor. Free and anonymous, no signup. Capture a baseline, come back within 24 hours, and see exactly what was added or removed - marked in place, before and after side by side. One click turns any check into a live change monitor.
Need a custom route?