StartupJS
Full-stack framework for real-time apps

Build cross-platform apps with reactive signals, real-time sync, and a built-in UI library

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Cross-Platform

One codebase for web, iOS, and Android — built on Expo and React Native.

Real-Time Sync

Data changes on one client appear instantly on all others via reactive signals.

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Signals

Reactive data pointers that automatically update your UI when data changes.

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Built-in UI Library

A full set of ready-to-use components designed for all platforms.