Know the moment
Monitor web pages for content changes, track uptime, SSL certificates, open ports, and domain expiry. Get notified through email, Slack, Discord, or webhooks.
Three ways to track page changes
Pick the approach that fits your needs — or combine them for full coverage.
Visual monitoring
Compare screenshots side by side. Spot layout changes, new banners, or updated images that text-based tools would miss entirely.
Text monitoring
Track the actual content of a page. Get alerted when wording changes, prices update, or paragraphs are added or removed. Word-level diffs included.
Element monitoring
Pick a specific part of the page to watch — a price tag, a status badge, a paragraph. Ignore everything else and only hear about what matters.
Keep your infrastructure in check
Lightweight, high-frequency checks that run every minute — no browser needed.
Ping & uptime
HTTP checks as often as every minute. Know the moment your site goes down and when it comes back up.
SSL certificates
Get alerted days before your certificate expires. Never let an expired cert take your site offline.
Port monitoring
Check whether critical ports are open and reachable. Get notified the instant a service stops responding.
Domain expiry
WHOIS-based domain expiration tracking. Get reminded well before your domain registration lapses.
Alerts you can actually trust
AI-powered filtering means you hear about real changes, not noise.
AI change filtering
Automatically ignores timestamps, session tokens, and cosmetic tweaks. You only hear about changes that actually matter to your business.
Smart keyword conditions
Set rules like “alert when price drops below $100” or “notify when page contains hiring”. Text, number, and regex conditions built in.
Custom AI conditions
Describe what you want in plain language. The AI evaluates each change against your instructions and decides whether to alert you.
Smart Signals
Combine multiple monitors into one condition. Get alerted when several things change together — across different pages or elements.
AI-generated summaries
Every alert includes a plain-language summary of what changed and why it might matter. No need to compare pages yourself.
Domain-specific extraction
Built-in extractors for job listings, legal documents, and product pages pull structured data automatically — titles, prices, dates, and more.
Up and running in three steps
Pick what to monitor
Paste a URL, use our Chrome extension, or record a browser action sequence. Works on any website, including pages that need JavaScript.
Choose what to watch
Use the visual element picker to select exactly which part of the page you care about. Or monitor the full page — your call.
Get alerted your way
Receive notifications through email, Slack, Discord, webhooks, Zapier, n8n, or RSS. With AI summaries and screenshot attachments.
This is what an alert looks like
Real changes, real diffs, real summaries — not just 'something changed on the page.'
Change detected on competitor /pricing
acme-saas.com · Text monitoring · 2 min ago
AI Summary
Pro plan price increased from $49/mo to $59/mo. Annual billing discount reduced from 20% to 15%. “14-day free trial” text removed from the pricing card. Enterprise tier CTA changed from “Start free” to “Contact sales.”
What Changed
- Pro plan: $49/month
+ Pro plan: $59/month
- Save 20% with annual billing
+ Save 15% with annual billing
- Start your 14-day free trial
+ Contact sales for a demo
Signal, not noise
Generic page monitors tell you something changed. We tell you what changed in the part you actually care about.
Generic page monitors
- Alert on every small page update
- No AI — timestamps, ads, and session tokens trigger alerts
- Only web page change detection
- “Page changed” with no context
ChangeNotifier
- Monitor specific elements — a price, a status badge, a paragraph
- AI filtering ignores noise, alerts on meaningful changes only
- Web monitoring + uptime, SSL, port, and domain checks in one platform
- AI-generated summaries explain what changed and why it matters
Alerts delivered where you work
Every alert includes a change summary, before-and-after comparison, and optional screenshot attachment.
Connect to your existing workflow with zero configuration. Structured diff data is available via webhooks for programmatic processing.
Built for everyone who needs to know
From business intelligence to personal alerts — one platform for all your monitoring needs.
Business teams
Track competitor pricing, feature updates, and market positioning. React to changes in hours, not weeks.
Legal & compliance
Monitor terms of service, privacy policies, and regulatory pages for changes that affect your obligations.
E-commerce
Watch product prices, stock status, and promotional offers. Never miss a deal or a restock.
Job seekers
Get alerted when new positions are posted on career pages that match what you're looking for.
Researchers
Track government pages, publications, and data sources. Get notified when new information is published.
DevOps & infrastructure
Monitor uptime, SSL certificates, open ports, and domain expiry. Get instant alerts when something goes down.
Set up monitors without leaving the page
Our Chrome extension lets you point, click, and start monitoring any element on any website. No URL copying, no switching tabs.
Simple, transparent pricing
Start free. Upgrade when you need more.
Free
Get started with basic monitoring
- 3 monitors
- Hourly checks
- Email alerts
- 15-day history
- 300 monthly credits
Starter
For individuals and small projects
- 20 monitors
- 15-minute checks
- 30-day history
- 3000 monthly credits
Standard
Best for most users
- 50 monitors
- 10-minute checks
- All alert channels
- 60-day history
- 15000 monthly credits
Advanced
Ideal for advanced usage
- 100 monitors
- 5-minute checks
- All alert channels
- 90-day history
- 30000 monthly credits
Questions answered
Straight answers to the questions we hear most.
What types of changes can I detect?
Text changes, visual changes via screenshots, and specific element changes. You can monitor any publicly accessible web page, including JavaScript-heavy single-page apps.
Choose between full-page monitoring or target a specific section — like a price tag, a paragraph, or a status indicator.
Do I need technical skills to use this?
Not at all. Our Chrome extension and visual element picker let you point and click to set up monitors. No code, no configuration files.
For power users, we also support CSS selectors, XPath, and custom AI conditions for maximum control.
How do I avoid getting too many alerts?
Target specific elements instead of watching the entire page. Add AI filtering to automatically ignore noise like timestamps, ads, and session data.
You can also set keyword conditions — for example, only alert when a specific phrase appears or when a number crosses a threshold.
What notification channels are supported?
Email, Slack, Discord, webhooks, Zapier, n8n, and RSS feeds. Every alert includes an AI-generated summary and optional screenshot attachments.
Connect to your existing workflow without changing how your team operates.
Can I monitor pages behind logins or with dynamic content?
Yes. Our browser automation lets you record click, type, and scroll sequences to navigate past cookie banners, login screens, or multi-step flows.
We use a real browser engine to render JavaScript-heavy pages, so what you see in your browser is what we monitor.
What infrastructure checks are available?
Ping/uptime monitoring (HTTP checks as often as every minute), SSL certificate expiry alerts, TCP port monitoring, and domain expiry tracking via WHOIS.
All infrastructure monitors run on dedicated lightweight infrastructure — separate from the browser-based web monitors — for fast, reliable checks.
Is there a free plan?
Yes. Start with our free plan to explore the platform and set up your first monitors. No credit card required.
Upgrade whenever you need more monitors, faster check intervals, or team features.
Stop checking websites manually.
Let ChangeNotifier watch for you and alert you when it matters.
Start monitoring free