Life & fun · alternatives · 2026

Sieve is a tool that filters webpages and monitors them for changes. Users can set up watches on specific web content and receive notifications when updates occur. The service is designed for anyone who needs to track… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Sieve - filter webpages and watch changes launched in 2013; newer entries below may have overtaken it.

1. 1ME
   Monitorbook – Easily track anything on the web▲134

   2014 · monitorbook.com · its alternatives →

2. 2
   Monitorbook▲294

   Easily track anything on the web

   2014 · its alternatives →

3. 3
   I built a tool that watches webpages and exposes changes as RSS▲320

   I built Site Spy after missing a visa appointment slot because a government page changed and I didn’t notice for two weeks. It watches webpages for changes and shows the result like a diff. The part I think HN might find interesting is that it can monitor a specific element on a page, not just the whole page, and it can expose changes as RSS feeds. So instead of tracking an entire noisy page, you can watch just a price, a stock status, a headline, or a specific content block. When it changes, you can inspect the diff, browse the snapshot history, or follow the updates in an RSS reader. It’s…

   Mar 2026 · sitespy.app · its alternatives →

4. 4TW
   Track when any website adds or removes anything▲11

   2014 · insights.nerdydata.com · its alternatives →

5. 5
   Sken.io▲115

   Advanced tool for change detection on any website.

   2019 · sken.io · its alternatives →

6. 6
   Changedetection.io detect changes in websites and JSON feeds▲147

   Best and simplest tool for website change detection, web page monitoring, and website change alerts. Perfect for tracking content changes, price drops, restock alerts, and website defacement monitoring—all for free or enjoy our SaaS plan! - dgtlmoon/changedetection.io

   2022 · github.com · its alternatives →

7. 7
   Peek in▲320

   Watch people use your web app in real time

   2016 · its alternatives →

8. 8
   PageGauge▲92

   Quickly assess your website's usability

   2015 · its alternatives →

9. 9
   Phare Uptime▲127

   Website monitoring, incident management, and alerting.

   2023 · phare.io · its alternatives →

10. 10
    ScrapeLoop▲111

    Turn any website into a data source in minutes

    2025 · scrapeloop.com · its alternatives →

11. 11DG
    Dffer – Get notified when a website changes▲63

    2017 · dffer.com · its alternatives →

12. 12
    Pagescreen▲104

    Track any website visual change. Effortless.

    2017 · pagescreen.io · its alternatives →

13. 13MS
    Mirrorshades – Simple web analytics▲66

    2017 · getmirrorshades.com · its alternatives →

14. 14CV
    Computer vision to track and notify website changes▲16

    2014 · obvious.io · its alternatives →

15. 15
    BytesMatter▲71

    Web monitoring and analytics through the eyes of your users

    2021 · its alternatives →

16. 16AT
    A tool that lets you visualize how people use your website in realtime▲69

    2014 · seeyourvisitors.com · its alternatives →

17. 17
    Monitor websites for change and get scraped data in a webhook▲49

    Monitor website changes around the clock and get alerts in Discord, Telegram, Slack, Google Sheets and many more apps - no code or technical skills needed!

    2019 · monitoro.xyz · its alternatives →

18. 18
    Watched▲3

    API-first website change detection with native MCP support

    Jun 2026 · watchedapi.com · its alternatives →

19. 19
    PageWatch – Check your site for layout errors/spelling mistakes▲19

    Detect mobile, SEO and usability issues before they cost you money.

    2020 · pagewatch.dev · its alternatives →

20. 20PT
    Pagesnap – Take monthly screenshots of any webpage automatically▲62

    2014 · pagesnap.io · its alternatives →

21. 21
    ChangeWatch▲6

    Website change alerts, made simple.

    Jan 2026 · changewatch.vercel.app · its alternatives →

22. 22
    Site Explorer▲12

    Website analytics and competitive heatmap analysis

    2018 · its alternatives →

23. 23
    Website Analyzer▲9

    Help your future customers outperfom their competition

    2025 · website-analyzer.app · its alternatives →

24. 24AN
    A new way to diff websites▲46

    2015 · diffd.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →