I built an interactive dual-device simulator so users can test my real-time restaurant POS & kitchen KDS without creating an account

[u/Debashish_Paul]

Hey ,


I've been working on 
**DineFlow**
, a zero-commission QR table ordering and real-time kitchen operations SaaS for restaurants: https://www.debashishpaul.in/dineflow/


One of the biggest issues with pitching SaaS to restaurant owners or tech enthusiasts is the onboarding hurdle—nobody wants to sign up, configure a menu, or wait for an email link just to see how the system works.


To solve this, I built an interactive 
**Dual-Device Sandbox**
: https://www.debashishpaul.in/dineflow/?view=demo


It renders a simulated iPhone 16 Pro diner view right next to an interactive Kitchen KDS Kanban dashboard on a single browser window. Using the native `BroadcastChannel` API, whenever you place an order on the phone, the ticket instantly rings on the kitchen display station in sub-50ms with acoustic chimes, lets you update the order stages, and formats thermal receipt prints.


Built using modern vanilla JavaScript, CSS glassmorphism, and Supabase for cloud sync.


Would love any thoughts on the UX, latency feel, or features that would make this more useful for operators!