ZetlynA price · stock · a version · or the whole page
Get told when a
web page changes.
Zetlyn watches a web page, or one place on it, and tells you what it said before and what it says now. No password, no dashboard to learn.
The first 3 days are free.
Consoles
PlayStation 5 Pro
2 TB · Disc drive sold separately
AvailabilityIn stock
One value, before and now. The clock, the visitor count and the advert on the page are never reported.
How it works
Three steps.
Then it runs on its own.
Paste the address
Any public web page: a pricing page, a release list, terms, a status page.
Click what matters
Zetlyn shows the page. Click the price, the version, the date, or watch the whole page.
Get notified
When it changes you get the value before and now, with a link to the page.
Not a diff
Watch one place, or the whole page.
Get the value, not forty lines of HTML.
Other tools email you every changed line. Zetlyn tells you what moved: Out of stock → In stock. Clocks, counters and adverts that change on every visit are recognised when you start and never reported.
When a page is rebuilt, Zetlyn finds your place again by what stands beside it. If it cannot be sure, it asks you to mark it again rather than send a change that is not one.
What people watch
Price drops, back in stock, new versions.
Anything a page says.
- Prices of a competitor, a product, a plan
- Releases of software they depend on
- Terms and privacy policies of services they use
- Rates and figures published by banks and offices
- Status pages and notices
- Job pages, calls and tenders
For agents and code
From Claude, ChatGPT and your own code.
One address: zetlyn.com/mcp.
Add Zetlyn to Claude, ChatGPT, Cursor or any MCP client with that address, sign in once, and ask it to watch a page for you. Programs use the HTTP API and signed webhooks. How to connect.
Pricing
Three days free.
Then 9.99 € a month.
Try it
Free
One watch for 3 days, checked every hour. No card.
Subscription
9.99 € a month
Up to 10 watches, as long as you like, checked as often as every minute. 0.50 € a month for each watch more. VAT included. Cancel any time.
Questions
Before you paste.
Do I need an account?
No, not one you make. When you watch your first page, Zetlyn makes an account for your email address by itself and sends you a link to confirm; the watch starts when you click it. After that you are signed in. There is no password.
Which pages can it watch?
Public web pages that show their content without signing in. Pages behind a login, a paywall or a captcha are not read, and Zetlyn does not try to get around a site that refuses it. Coming next: PDF documents, CSV and Excel files, JSON APIs, and RSS and Atom feeds.
How often does it check?
Every hour. With a subscription you choose for each watch: every hour, every 15 or 5 minutes, or every minute.