Dev tools · alternatives · 2026

24 alternatives to UpUp

Make sure your sites work even when your users are offline

UpUp is a free, open-source JavaScript library that enables websites to function when users are offline. It uses service worker technology to serve content to users without internet connectivity, simplifying… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. UpUp launched in 2015; newer entries below may have overtaken it.

1. 1MY
   Make your app handle going offline▲151

   Offline.js is a Javascript and CSS library to automatically alert your users when they

   2013 · github.hubspot.com · its alternatives →

2. 2
   Up Or Nah▲111

   Check if a website is offline for everyone, or just you.

   2018 · upornah.com · its alternatives →

3. 3
   updown.io▲112

   Simple & Inexpensive Website Monitoring.

   2015 · updown.io · its alternatives →

4. 4
   Site Up▲266

   The best of site design & front-end resources, daily

   2015 · its alternatives →

5. 5
   Odown▲74

   Simple and reliable uptime monitoring service

   2021 · odown.com · its alternatives →

6. 6
   Uptime Monitor▲76

   Get instant alerts when your website goes down.

   2023 · uptime-monitor.io · its alternatives →

7. 7
   Up Ninja▲128

   Simple and affordable uptime monitors and status pages

   2020 · upninja.io · its alternatives →

8. 8
   Simple Uptime▲203

   Monitor the health of your websites and servers inside Slack

   2024 · simpleuptime.app · its alternatives →

9. 9UW
   Uptime.website – A free uptime check tool▲11

   2024 · uptime.website · its alternatives →

10. 10
    Updown.io, a simple and cheap website monitoring service▲38

    ϟ Website monitoring — beautiful, simple and inexpensive.

    2014 · updown.io · its alternatives →

11. 11
    SiteSupport.com - Remote Desktop For Webbased Applications▲67

    SiteSupport bouwt effectieve platformen die impact maken. We vertalen doelstellingen direct naar resultaat., SiteSupport.com

    2011 · sitesupport.com · its alternatives →

12. 12
    UpScout▲125

    Lightning-fast uptime monitoring, engineered in Rust.

    2024 · upscout.io · its alternatives →

13. 13
    Someone.io – Task management for teams made easy▲151

    Work together from anywhere Upwave is an engaging and easy-to-use suite of web-based apps to help you collaborate, coordinate and keep track of efforts across your organization. Get started Happy customers in over 30 countries suite Fully integrated collaboration apps for the modern workplace Upwave

    2015 · someone.io · its alternatives →

14. 14CA
    Checkup, an open-source uptime monitoring tool built for developers▲22

    2016 · text.sourcegraph.com · its alternatives →

15. 15OP
    Our pivot that nudges you to try new offline things. No lame coupons▲33

    2013 · upout.com · its alternatives →

16. 16
    Down for Everyone or just Me?▲239

    The essential tool for checking if a website is up or not

    2015 · downforeveryoneorjustme.com · its alternatives →

17. 17
    Redux Offline – Build Offline-First Apps for Web and React Native▲174

    Build Offline-First Apps for Web and React Native. Contribute to redux-offline/redux-offline development by creating an account on GitHub.

    2017 · github.com · its alternatives →

18. 18
    easyping.▲110

    Uptime monitoring made super easy 📯.

    2020 · easyping.io · its alternatives →

19. 19
    UpCat▲68

    A.I. Powered Upwork Proposals to get hired faster on Upwork

    2023 · upcat.app · its alternatives →

20. 20OA
    Offline – Access your favorite websites without a network connection▲69

    2015 · play.google.com · its alternatives →

21. 21UB
    Uplink – Build Reusable Objects for Consuming Web APIs▲51

    2018 · uplink.readthedocs.io · its alternatives →

22. 22
    Web Uptime▲103

    Multi-location website uptime monitoring

    2016 · its alternatives →

23. 23
    Free Website Uptime Checker▲9

    Is your website available worldwide? Let’s find out!

    2024 · odown.com · its alternatives →

24. 24
    Uptime by Linkjar▲64

    Be the first who knows that your website is down

    2021 · 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 →