sysend

The premium Open Source alternative to Pusher

🎯 Best for:Applications needing to sync state (like shopping carts) across multiple open tabs.

What is sysend?

A client-side alternative to Pusher or Socket.io for synchronizing data between browser tabs. It utilizes LocalStorage and BroadcastChannel APIs to enable zero-latency communication without a server.

Tech Stack
JavaScriptFrontend & Headless CMS

Why sysend?

  • No server required
  • Extremely lightweight
  • Privacy-focused (local data)

Limitations

  • Same-origin only
  • No cross-device sync
  • Browser API dependent
12/6/2025
Last Update
74
Forks
5
Issues
MIT
License
Financial Leak Detected

Stop the "SaaS Tax"

Your team could be burning cash. Switching to sysend instantly boosts your runway.

Competitor Cost
-$1,440
/ year (est. based on Pusher)
Self-Hosted
$0
/ year
Team Size10 Users
150+
SAVE 100%

Community Discussion

Comments