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+---
+name: Apollo State Sync
+description: Seamlessly synchronize and persist Apollo Client cache and reactive variables across multiple browser tabs and windows for a consistent user experience.
+github: sdev-buildz/apollo-state-sync
+npm: apollo-state-sync
+tags:
+ - tools-and-libraries
+ - frontend
+---
+
+## 💡 Why use it?
+
+Modern web apps often run across multiple browser tabs or windows within the same workflow. Without shared state synchronization, users can end up with inconsistent data:
+
+- logged in status differs across tabs
+- Data edited in one tab stays outdated in another until a manual refresh.
+- in-memory caches are inconsistent across tabs
+- app state resets unexpectedly when a tab is reopened
+
+
+
+## ✨ Features
+
+- Syncs Apollo Client's state (Apollo cache and reactive variables) across all browser tabs and windows.
+- Persists state across browser restarts and user sessions
+- Helps build multi-window and multi-tab apps without custom state plumbing
+
+
+
+## 🔌 API reference
+
+- 🚀 **Quick Start**: Jump into the [API Overview](https://github.com/sdev-buildz/apollo-state-sync/blob/6cd9a05467ade3a31ac0350aa9fe7cad3c3ae760/API_OVERVIEW.md) to get up and running in minutes.
+- 🤖 **Automated Migration**: Effortlessly transition from standard Apollo Client using the [Migration Bot](https://github.com/sdev-buildz/apollo-state-sync/blob/6cd9a05467ade3a31ac0350aa9fe7cad3c3ae760/README.md#-migration-automation).
+
+
+
+## 📽️ See it in Action
+
+[
](https://github.com/user-attachments/assets/18df5e73-f7a6-417f-8398-2bb8251ccc3e)
+
+
+
+### 🌐 Try the Live Demo
+
+You can access the live application here: https://sdev-buildz.github.io/apollo-state-sync/examples/posts