Simple Private Booking App for Family Sports Facilities (Android / iOS) Project Overview We need a very simple, private booking app for family use only (max 20 users) to manage bookings for a football field and padel court. This is not a public app. No payments. No social features. >> Core Requirements (MVP) Users & Access Invite-only login (email or phone) Only admin can add/remove users >> Booking Features Calendar view (day/week) >> Two facilities: Football Field Padel Court >> Create booking: Date Start time / End time Facility Prevent double bookings Edit / cancel bookings >> Roles Family User: create/edit/cancel own bookings Facility Manager: View all bookings Receive notifications on new/updated bookings Admin: Full access Block dates/times Manage users >> Notifications Push notification to facility manager when: Booking is created Booking is changed or cancelled >> Technical Preferences Mobile app: Flutter or React Native Backend: Firebase (preferred) Android required, iOS optional Clean, simple UI >> Out of Scope (Important) No payments No chat or comments No public access No advanced analytics No branding or animations >> Timeline & Budget Target timeline: 2–4 weeks Looking for cost-effective MVP Future enhancements possible if MVP is successful >> Proposal Requirements Please include: Similar booking or calendar apps you’ve built Tech stack you recommend Estimated cost and timeline