Zetlyn

A price · a mark · one message

Price drop alert for any shop page

Mark the price on a product page and say below what it is worth telling you. Zetlyn reads the page every hour, or as often as every minute with a subscription, and tells you once when the price falls below your mark, with the price before and the price now.

shop.example/oled-55

Televisions

OLED 55″

4K · 120 Hz · 2026 model

Price449,00 €389,00 €

Add to cart
Price shop.example/oled-55watchingnotified
400 €
Before–449,00 €
Now449,00 €389,00 €
Whenthe price is below 400 €

How it works

  1. Paste the product page's address below.
  2. Click the price on the page.
  3. Choose When the number is below and enter your mark, for example 400.

Zetlyn reads the amount beside the currency, as the page writes it: 1.299,00 €, $1,299.99, 499,- and £51.77 all work. If the place you marked shows two different amounts, such as an old and a new price, Zetlyn asks you to mark the one you mean, so the alert never compares the wrong number.

It tells you when the price falls below the mark, not with every cent it falls further. Once the price has gone back above the mark, the next drop is told again.

Where the message goes

By email, and if you like to Telegram, Slack, Discord or your own webhook. Every change is also kept in the watch's history.

  • Email
  • Telegram
  • Slack
  • Discord
  • Webhook

Zetlyn

Below your mark: shop.example/oled-55

449,00 € → 389,00 €

From Claude or ChatGPT

With Zetlyn connected as an MCP server you can ask in plain words: "Tell me when the PS5 Pro on this page drops below 700 €." The assistant finds the price on the page and makes the watch. See Claude, ChatGPT or Cursor.

What it does not do

Pages behind a login, a paywall or a captcha are not read, and Zetlyn does not get around a site that refuses programs. Some large shops do; Zetlyn says so when you try.

Watch your first page.
The first 3 days are free.