Stop refreshing pages.
Start knowing.
Prices change, terms update, jobs get posted, products restock — and you find out too late. These tools make sure that never happens again.
Three ways to detect changes
Visual, text, or element-level — choose the detection mode that fits your use case.
Visual (screenshot) monitoring
Capture full-page screenshots and compare them over time. Ideal for catching layout changes, new banners, image swaps, or anything that text-based detection would miss.
- Full-page capture with smart auto-scrolling
- Side-by-side before-and-after comparison
- Works on any website, including JavaScript-rendered pages
- Configurable viewport and full-page height
- Diff percentage tracking for each change
Keep your services online
Lightweight checks that run as often as every minute — no browser overhead, instant alerts on state changes.
Ping & uptime monitoring
HTTP HEAD checks against your URLs as often as every minute. Get alerted the moment your site goes down, and again when it recovers.
- Checks as frequent as every 1 minute
- Response time and HTTP status tracking
- State-change alerts (down & recovery)
SSL certificate monitoring
TLS certificate expiry checks. Configure how many days before expiry you want to be warned — never let an expired cert surprise you.
- Configurable alert threshold (e.g. 14 days before expiry)
- Issuer, subject, and validity date details
Port monitoring
TCP connect checks on any host and port. Know instantly when a database, mail server, or custom service stops responding.
- Any TCP port on any host
- Open/closed state change detection
Domain expiry monitoring
WHOIS-based domain registration tracking. Get reminded well before your domain lapses — supports 20+ TLDs.
- Configurable alert threshold (e.g. 30 days before expiry)
- Registrar and expiry date details
AI that understands what matters
Stop drowning in false positives. Our AI layer evaluates every change and only alerts you when it counts.
AI change filtering
Our AI evaluates every detected change and decides whether it's meaningful. Timestamps? Ignored. Session tokens? Filtered. Real content changes? You get an alert.
- Automatic noise detection
- Context-aware evaluation for different page types
Custom AI conditions
Tell the AI what matters to you in plain language: “Alert me if the price drops below $50” or “Notify me when they mention a new integration.” The AI handles the rest.
- Natural language condition builder
- Evaluates against every detected change
Smart keyword conditions
Keyword added, keyword removed, contains phrase, regex match, number above or below a threshold. Combine multiple conditions to create precise filters.
- Text, number, and regex matching
- Apply to full page or specific selector
Smart Signals
Create conditions that span multiple monitors. Example: alert when competitor A and competitor B both change their pricing on the same day. Combine up to 5 data points.
- Multi-monitor conditions
- Auto-pause linked monitors when triggered
Domain-specific extractors
Built-in intelligence for job listings, legal documents, and product pages. Automatically extracts structured fields like job title, salary, location, effective dates, or product prices — so your alerts include actionable data, not just “something changed.”
Set up once, monitor forever
Powerful tools to configure your monitors exactly how you want them.
Chrome extension
Install our Chrome extension to set up monitors without leaving the page you're browsing. Click on any element to start tracking it. Record multi-step browser actions right from your browser.
Learn about the extension- Point-and-click element pickerHover and click to select exactly what to monitor
- Action recordingRecord clicks, typing, and scrolling for complex pages
- Instant setupConfigure and start monitoring without leaving the page
Browser automation
Need to click a cookie banner? Log in? Navigate through tabs? Record a sequence of browser actions — click, type, scroll, wait — and the monitor replays them before every check. Up to 50 steps per monitor.
- Click, type, scroll, wait, and navigate actions
- Navigate past cookie banners and login screens
- Real browser engine renders JavaScript-heavy pages
- Enable or disable steps per monitor
Flexible scheduling
Check every 5 minutes or once a month. Set time windows to only check during business hours. Choose specific days of the week. Auto-pause after detecting a change if you only need one alert.
- Check intervals from 5 minutes to monthly
- Time windows and day-of-week filters
- Timezone support for global teams
- Auto-pause after change detection
Alerts that go where you work
Seven notification channels, all with rich content and AI summaries.
AI summaries
Every alert includes a plain-language summary of what changed and why it matters.
Screenshot attachments
Before-and-after screenshots attached directly to your notifications.
Structured diffs
JSON diff data via webhooks for programmatic processing and custom integrations.
Text comparison
Color-coded before-and-after text diffs showing exactly what was added, removed, or modified.
Built for teams
Share monitors, manage access, and keep your whole team in the loop.
Workspaces
Create workspaces and invite team members. Everyone sees the same monitors and alerts.
Role-based access
Owner, admin, editor, and reader roles. Control who can create, edit, or just view monitors.
Public sharing
Share specific monitors or comparisons with stakeholders via secure, read-only links.
Consolidated billing
One subscription for the whole workspace. Add team members without managing individual accounts.
Technical capabilities
Enterprise-grade infrastructure for reliable, consistent monitoring.
JavaScript rendering
Real browser engine renders SPAs, React apps, and any JavaScript-heavy page.
Residential proxies
Country-specific residential proxies for geo-restricted content. US, UK, FR, DE, and more.
Ad blocking
Built-in content blocker removes ads and trackers for cleaner monitoring results.
REST API
Full API access for creating monitors, retrieving alerts, and managing settings programmatically.
Change history
Full timeline of detected changes with screenshots, diffs, and extracted data for every alert.
API keys
Personal API tokens for secure automation and third-party integration.
Ready to try it?
Start with the free plan and explore everything ChangeNotifier can do. No credit card required.