Website Change Detection

Get Alerted When Any Page Changes

Submit a URL. We check it continuously and notify you the moment content changes. No browser extensions, no scripts, just an API call.

Start monitoring a page (free)

Free tier: 3 URLs, checked every 6 hours. No credit card needed.

Built for real monitoring needs

Track the pages that matter to your business

Competitor Monitoring

Know when competitors change pricing, features, or messaging. React before your customers notice.

Price Tracking

Watch product pages for price drops, stock changes, or new deals. Never miss a price cut.

Job Posting Alerts

Monitor career pages at target companies. Get notified the minute a new role is posted.

Legal & Compliance

Track terms of service, privacy policies, and regulatory pages for changes that affect your business.

How it works

1

Submit a URL

Use the form above or our REST API. Tell us what page to watch and where to send alerts.

2

We take a snapshot

We fetch the page, strip HTML, and store a text fingerprint. This is your baseline.

3

Continuous checks

Every 5 minutes (Pro) or 6 hours (Free), we re-fetch and compare. If the text content changed, you get notified.

4

Get a diff

Every alert includes what was added and removed. View the full change history via API or dashboard.

Simple pricing

Start free. Upgrade when you need faster checks and more URLs.

Free
$0 /mo
For personal use and trying things out
  • 3 monitored URLs
  • Check every 6 hours
  • Email alerts
  • Change history (last 30 days)
  • REST API access
Get Started Free

Developer-friendly API

Everything works via REST. No SDK required.

# Register a URL to watch curl -X POST https://nopii.xyz/v1/watch/create \ -H "Content-Type: application/json" \ -d '{ "url": "https://competitor.com/pricing", "email": "alerts@yourcompany.com" }' # List your watched URLs curl https://nopii.xyz/v1/watch/list?email=alerts@yourcompany.com # Get changes for a specific watch curl https://nopii.xyz/v1/watch/abc123/changes?email=alerts@yourcompany.com # Pro users: pass your API key for higher limits curl -X POST https://nopii.xyz/v1/watch/create \ -H "Authorization: Bearer paid_YOUR_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "url": "https://competitor.com/pricing", "email": "alerts@yourcompany.com" }'