The full answer
Real-time updates matter in products where waiting for a page refresh breaks the experience: quick commerce apps tracking a rider, event platforms showing live availability, fleet dashboards in a command centre or sales tools surfacing a new lead the moment it arrives.
For two-way communication, such as chat or collaborative tools, Creuto uses WebSockets with a Node.js backend and Redis to fan messages out across multiple server instances. For one-way streams, such as live prices or progress updates, server-sent events are simpler and scale well. Streaming responses from AI models use the same techniques.
Push notifications reach users when the app is closed. Creuto integrates Apple and Google push services and web push, builds the preference and scheduling logic behind them, and tracks delivery and opt-out rates so notifications stay useful rather than intrusive.
Reliability is designed in: reconnection with backoff, message ordering, delivery guarantees through queues where they matter, and graceful fallbacks when connectivity is poor, which is common on mobile networks.
Real-time features are load-tested before launch because concurrent connections behave differently from ordinary web traffic. FlashNow, the quick commerce app Creuto built for 10 to 30 minute delivery, is the kind of product where live status for customers and operations is central.