Charity Run Photo Upload App

I’m organising a one-day fun run for about 100 participants and need a simple mobile app to capture the day. The flow is straightforward:

• When a runner opens the app, the first of eight Google-Maps screenshots I provide appears. Swiping (or tapping “Next”) moves them through the remaining seven sections as they reach each checkpoint.

• At every checkpoint they must snap a quick photo with the in-app camera—no gallery uploads—then confirm the picture before progressing. Each photo automatically tags itself to the corresponding checkpoint.

• After finishing all eight points, users either:
– browse every participant’s shots inside a shared gallery, or
– if the shared gallery proves expensive to host, let me alone see the full collection through a simple admin view or downloadable archive; I’ll repost highlights to our social channels myself.

Please build for both iOS and Android with a lightweight backend (Firebase, Supabase, or similar) to handle user auth, image storage, and basic moderation. QR code or email login is fine; I’m open to your suggestion here as long as setup is minimal for the runners.

Deliverables
1. Cross-platform mobile app (APK + iOS TestFlight build) ready for event day
2. Cloud backend configured and handed over with clear storage limits
3. Admin access to download or review all images
4. Basic usage guide so volunteers can help runners on the day

If you can keep the interface clean, responsive, and event-ready within the next few weeks, I’d love to hear how you’d tackle it.