How it works
ChangeSentry watches the public pages your team would otherwise check by hand, then turns detected edits into readable alerts and reviewable history.
01
Paste a public URL, name the monitor, and choose a check interval. Start with the full page or jump straight to the section that matters.
Add a monitor
Paste the public URL you want to watch
02
Optionally target a CSS selector — a price block, job list, policy body, or feature table — so timestamps, ads, and navigation do not trigger false positives.
Scope the monitor
Target the pricing table so ads and nav do not trigger alerts
Interval
Every 15 min
Selector
#pricing-table
03
The crawler renders the page, extracts monitored content, normalizes common noise, and compares each snapshot against the previous one. You get a cleaner diff, not layout churn.
Monitor tracker
Checked
Page rendered
Compared
Snapshot diffed
Changed
Signal found
04
When a meaningful edit is detected, ChangeSentry records the change history and sends a readable alert through email, in-app, Discord, or Telegram — depending on your plan.
Pro plan price changed from $49 to $39
Refine after the first alert
Step 1 · Full page
Watch competitor.com/pricing
Step 2 · Scoped
#plan-pro .price
If you are unsure which selector to use, start by watching the full page. After the first alert, scope the monitor to the exact content area that produced useful signal.
For pages that change constantly, selector scoping and clear monitor intent are the difference between a helpful alert stream and noisy busywork.
Under the hood
Reliable monitoring is more than a diff — it is respectful crawling, scoped selectors, readable history, and alerts you can act on.
ChangeSentry can handle many modern pages that load content with JavaScript. Some websites still block automated access with CAPTCHAs, login walls, robots.txt rules, or aggressive anti-bot controls, and we surface those limits clearly.
Monitor only the content that matters. Scoping helps ignore unrelated navigation, timestamps, ads, recommendation widgets, and rotating page elements that do not affect your decision.
Detected changes are kept with timestamps, monitor context, and readable before-and-after text so you can understand what changed and when. Retention depends on your plan and operational archive settings.
Monitors are designed for public webpages and responsible use. You are responsible for the URLs you monitor, and ChangeSentry may pause checks that create security, legal, abuse, or reliability risk.
Instead of asking you to inspect raw source, ChangeSentry highlights the changed text and gives you enough context to decide whether to act, share, ignore, or tune the monitor.
Start with a URL, then refine the interval, selector, label, notification channel, and tags as you learn which changes are actually useful to your workflow.
Best for
Quick answers about setup, selectors, check intervals, and how alerts are delivered.
See all FAQsPaste a URL, pick an interval, and get your first alert when something meaningful changes — no scraper code required.
