Life & fun · alternatives · 2026

Offline JavaScript PubSub between browser tabs is a JavaScript library that enables communication between multiple browser tabs without requiring an internet connection. It allows developers to set up publish-subscribe… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   JavaScript PubSub in 163 Bytes▲104

   pubsub in <100 bytes. Contribute to hassanshaikley/pico-pubsub development by creating an account on GitHub.

   2025 · github.com · its alternatives →

2. 2MY
   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 →

3. 3
   AcrossTabs – Easy communication between cross-origin browser tabs▲107

   Easy communication between cross-origin browser tabs. Simplified "CORS"ing! - wingify/across-tabs

   2017 · github.com · its alternatives →

4. 4
   across-tabs▲90

   Easily communicate among browser tabs

   2017 · engineering.wingify.com · its alternatives →

5. 5
   Tabl 1.0▲752

   A multi-player web browser

   2025 · its alternatives →

6. 6
   UpUp▲306

   Make sure your sites work even when your users are offline

   2015 · talater.com · its alternatives →

7. 7PP
   patchbay.pub – Poor man's ngrok/IFTTT/serverless▲362

   2019 · patchbay.pub · its alternatives →

8. 8SP
   Simple pub/sub using WebSockets in Node.js▲13

   I built this pubsub module because I wanted a simple solution that uses only node. Why did I want pubsub? I wanted to build a complex app but segregate it into microservices that work together through event messages. I also wanted to use this method instead of node's built-in clustering for multiple instances. I've been running it for a few weeks now with several messages per second bugfree. I plan to use this setup for future apps as it reduces complexity of the code and allows me to restart&#x2F;update one part of the app without interrupting the other parts. I would love to receive…

   2022 · npmjs.com · its alternatives →

9. 9
   I saw this mind-blowing experiment, so I made a simple version of it▲403

   Two browser windows (acting as socket clients) communicate their: - Screen dimensions - (screen.width, screen.height) - Window dimensions - (window.innerWidth, window.innerHeight) - Window X&#x2F;Y position - (window.screenX, window.screenY) ...or whichever calculation works best for you. The original work by Bjorn Staal https:&#x2F;&#x2F;twitter.com&#x2F;_nonfigurativ_&#x2F;status&#x2F;172732259457002734 used localStorage, but I found sockets more fun, because if tweaked a bit, this can be shared with friends. Here's a demo of how it works and the codebase:…

   2023 · github.com · its alternatives →

10. 10
    Unifrost – Stream PubSub Messages to the Browser▲36

    Making it easier to push pubsub events directly to the browser. - rajveermalviya/unifrost

    2019 · github.com · its alternatives →

11. 11
    Bonsplit – Tabs and splits for native macOS apps▲245

    A native macOS tab bar library with split pane support for SwiftUI applications. Features 120fps animations, drag-and-drop tabs, and full keyboard navigation.

    Jan 2026 · bonsplit.alasdairmonk.com · its alternatives →

12. 12
    Deepstream.io – open-source real-time server with pub/sub and data sync▲301

    A realtime server for the modern web

    2016 · deepstream.io · its alternatives →

13. 13
    HTML Pub▲393

    Turn AI-generated HTML into a live URL via MCP/API

    Mar 2026 · htmlpub.com · its alternatives →

14. 14
    Tabstack Dev Tools▲319

    Ditch your scraper. Make one API call with any tool.

    Jun 2026 · tabstack.ai · its alternatives →

15. 15
    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 →

16. 16
    Cross-browser asynchronous JS script loader w/callbacks▲45

    2012 · github.com · its alternatives →

17. 17
    SocketCluster.io – flexible open-source real-time server with pub/sub▲217

    Scalable open source pub/sub SDK with support for RPC, JWT authentication and Kubernetes — optimized for async/await

    2016 · socketcluster.io · its alternatives →

18. 18
    A remote browser product, open-sourced▲253

    💚🇺🇸🗽Secure remote browsing anywhere, any way you like it. - GitHub - BrowserBox/BrowserBox: 💚🇺🇸🗽Secure remote browsing anywhere, any way you like it.

    2019 · github.com · its alternatives →

19. 191A
    1paragraph – a browser-based, offline-first ePub reader▲108

    2022 · 1paragraph.app · its alternatives →

20. 20WL
    We launched a new web browser▲203

    My company launched a new open source web browser built on Chromium. It supports decentralized domains on Handshake and is the first browser to support .eth DNS. It is also the first browser to support secure web browsing with DANE. Check it out: https:&#x2F;&#x2F;impervious.com&#x2F;beacon https:&#x2F;&#x2F;github.com&#x2F;imperviousinc&#x2F;beacon

    2022 · its alternatives →

21. 21
    Offline JS Playground▲98

    Write, run, and test JavaScript snippets & JSON offline

    Aug 2026 · chromewebstore.google.com · its alternatives →

22. 22
    Store.js v2.0 – Cross-browser storage for all use cases▲162

    Cross-browser storage for all use cases, used across the web. - marcuswestin/store.js

    2017 · github.com · its alternatives →

23. 23
    Tabstack by Mozilla▲70

    Extract web data and automate browsers, no scraper required.

    Apr 2026 · tabstack.ai · its alternatives →

24. 24
    Pion/handoff – Move WebRTC out of browser and into Go▲101

    Start WebRTC in the browser—run it somewhere else. Contribute to pion/handoff development by creating an account on GitHub.

    Apr 2026 · github.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 →