Flip X is a mobile bidding app built with Flutter. You browse listings, place bids on the items you want, and complete checkout inside one app. It runs from a single codebase on Android and iOS.
The problem
A bidding purchase splits across two places in most apps. You bid in one screen and pay somewhere else. You lose track of what you bid on and when a listing closes. Flip X puts browsing, bidding, and checkout in one flow, so you follow an item from your first bid to payment without leaving the app.
What we built
- A listings feed where you browse items open for bidding
- A bidding flow to place a bid and track it against an item
- Checkout inside the app, so you buy what you win in the same place
- One Flutter codebase that ships to both Android and iOS
- A clean mobile interface rated for all ages
How we worked
You get a working build every week and run it on your own phone. Your feedback goes to the engineers who write the code, with no account manager in the middle. The team that builds your app is the team that maintains it.
The outcome
Flip X shipped to the Google Play Store under AppCrew Technologies. It runs on Android, and the Flutter codebase carries the same app over to iOS. The Play listing shows over 100 downloads. AppCrew maintains the app, and the last update landed in August 2025.
