The Water Test
See microplastic in your water
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
The Water Test turns your iPhone into a microplastics reader for the at-home test kit.
Order a kit at thewatertest.com, run a tap-water sample through the filter, then rest your phone on the kit box and capture the filter. The app uses a long-exposure,
multi-frame capture tuned for the fluorescent stain, then shows you a particle count — Low, Medium, High, or Very high — with the analysis views.
• Purpose-built capture: locked focus, manual exposure, and frame-stacking for a clean, repeatable image
• A clear particle count and severity
• Your history saved on-device — revisit any test with location and date
• Pinch-to-zoom on every image
• No account required
The Water Test is a companion to the physical test kit
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
This version improves how the app takes photos of the filter.
The developer, Andrew Pierno, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- User Content
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Contact Info
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Andrew Pierno
- Size
- 1.4 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 The Water Test