zetlyn

Paste a URL.
Hear when it changes.

Zetlyn watches a web page, or one place on it, and emails you what it said before and what it says now. No password, no dashboard to learn.

The first 24 hours are free.

1

Paste the address

Any public web page: a pricing page, a release list, terms, a status page.

2

Click what matters

Zetlyn shows the page. Click the price, the version, the date, or watch the whole page.

3

Get an email

When it changes you get the value before and now, with a link to the page.

Not a diff. The value.

Other tools email you forty changed lines of HTML. Zetlyn tells you what moved: 499 € → 399 €. 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.

Changed: acme.example/pricing

The place beside “Enterprise” changed,
noticed 18 Oct 2026 09:00 UTC:

  before   499 € / month
  now      399 € / month

See the page:
  https://acme.example/pricing

What people watch

Pricing

Try it

Free

One watch for 24 hours, checked every hour. No card.

Subscription

9.99 € a month

Up to 10 watches, checked every hour, as long as you like. 0.50 € a month for each watch more. VAT included. Cancel any time.

Questions

Do I need an account?

Your email address is your account. The first time, Zetlyn sends you a link to confirm; 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. PDF, CSV and JSON are coming.

How often does it check?

Every hour.

What do you keep?

Your email address, the pages you watch and what was read at the place you marked. Servers are in the EU. When you end a watch, it is gone.