Website intelligence by CSY
Know when websites change.
Monitor competitor pricing, product updates, and important web pages automatically.
Add a URL
Name the page and choose how often CSY Signal should check it.
We store a baseline
The first successful check becomes the snapshot. No false alarm.
See what changed
Later checks compare normalized text and email you a readable diff.
Built for the pages that affect revenue
Competitor monitoring
Watch pricing pages, feature lists, and landing pages without opening them every morning.
Pricing change detection
Normalized text comparison ignores markup noise so a $19 to $29 change actually stands out.
Website history
Keep a clean record of what the page said before, with snapshots tied to each detected change.
Email alerts
Get a concise email the moment CSY Signal confirms a meaningful difference.
Change comparison
Open a readable before/after view instead of scrolling through raw HTML.
Example change detection
A competitor updates pricing. CSY Signal keeps the noise out and shows the lines that actually moved.
Starter $19/month
Starter $29/month
Simple plans
Start free. Upgrade when the watchlist grows.
For founders validating a watchlist.
- 3 monitors
- 24 hour checks
- 7 day history
- Email alerts
For teams tracking competitors closely.
- 50 monitors
- Hourly checks
- 90 day history
- Priority monitoring
Stripe billing is not connected yet. The upgrade path is ready.
FAQ
What pages can I monitor?
Any public HTTP or HTTPS page: pricing, changelogs, careers, feature pages, and competitor landing pages.
How does CSY Signal avoid false positives?
It strips scripts and styling, extracts visible text, then hashes the normalized content. Layout-only edits usually do not create a change.
Do I need a browser extension?
No. Checks run on the server with a separate worker process.
Is Stripe required to start?
No. New accounts start on Free. Pro limits are already enforced so billing can be added later.