An app that tells people when their water filter needs replacing.
Role
Solo product design and mobile engineering
Status
Client product · In production
Platform
iOS / Android
Year
2022 / 2026
Tools
Flutter / Dart / Firebase / SwiftUI
ÖKO CounterSolo product design and mobile engineering
Overview
ÖKO filters have a finite lifespan. I designed and built the app alone, then evolved it for four years as the range grew from bottles to tap filtration.
50k+accounts created
4 yearsin production
2mobile platforms
Solodesign to release
Inside the project
The daily action belongs outside the app
One gesture from the home screen
Opening the app for every refill recreated the friction it was meant to remove. The widget keeps the current bottle visible and records the common volumes directly from the iOS home screen.
Hiking
19/581
ÖKO Counter
Interactive web reproduction of the iOS widget. It runs locally and is not connected to an ÖKO account.
The native widget in its real iOS context.
The rest can happen more quietly
A bottle still needs a simple count. Tap-water filters instead use postcode, local water characteristics and time to estimate replacement. The interface stays simple because the calculation does not become the customer’s job.
