Zetlyn icon
Zetlyn icon

Zetlyn

Get told when a web page changes: one place on it, such as a price, stock or a version, or the whole page.

Zetlyn screenshot 1

Cost / License

  • Freemium (Subscription)
  • Open Source (MIT)

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  • Online
  • Self-Hosted
  • Docker
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Zetlyn information

  • Developed by

    DE flagArtur Susdorf

  • Licensing

    Open Source (MIT) and Freemium product.

  • Pricing

    Subscription ranging between $11 and $12 per month + free version with limited functionality.

  • Written in

  • Alternatives

    3 alternatives listed

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  • Supported Languages

    • English

AlternativeTo Categories

Network & Admin, Home & Family, OS & Utilities, AI Tools & Services

GitHub repository

  •  0 Stars
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  •  0 Open Issues
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What is Zetlyn?

Zetlyn watches a public web page and tells you when it changes, with what it said before and what it says now. You paste the address, click the place that matters, such as a price, an availability line or a version number, and only that place is compared, so clocks, adverts and visitor counters never set it off. You can also watch the whole page line by line.

You can say when a change is worth a message: when a price falls below a mark, rises above one, or when a text such as "In stock" appears or goes. JSON APIs, RSS and Atom feeds, XML and plain text are read too; a feed reports only its new entries. Pages that scripts build are read in Chrome.

Messages go by email, Telegram, Slack, Discord or an HMAC-signed webhook. Zetlyn is also an MCP server with OAuth, so Claude, ChatGPT, Cursor and other AI assistants can set up and read watches when you ask them in plain words.

Zetlyn is open source under the MIT licence: one Rust program and one SQLite file, with a Docker image for amd64 and arm64. The hosted service at zetlyn.com, on servers in Germany, is 9.99 € a month for 10 watches, VAT included, with the first 3 days free.

It does not read pages behind a login, a paywall or a captcha, and it does not get around sites that block programs.