Crack Detector - Crack Gauge
Measure cracks from a photo
Only for iPhone
£4.99 · In-App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
New in 4.0: a dashboard that compares your sites, and a map that shows where you measured. Add one printed marker and get width and length in millimeters.
Crack Detector finds cracks in concrete and walls from a photo taken with your phone, then measures their width and length.
Machine learning locates the crack and traces its outline. Print the marker, place it next to the crack, and take the photo — the marker becomes the ruler, and width and length come out in millimeters. Without a marker the result is recorded as a relative value, and the app keeps the two clearly apart by color and shape.
■ Measure
• Analyzed right after you shoot — position, width, length
• Millimeters with a marker, relative (pixel) values without — never confused
• Multiple markers crop the photo to the area you care about
• Site name, location and time are recorded with every measurement
■ Dashboard
• Width distribution — which size range your cracks fall in
• Site comparison — which site is worse, by median and maximum width
• Widest cracks — where to look first
• Measurements by month
■ Sites
• Pick one site and see its summary, distribution and every measurement
■ Map
• Every measurement on a map. Measurements at the same spot are grouped so none is hidden
• Measured and relative values told apart by color
■ Records
• Search by period and site name, mark favorites
• Export to Excel (xlsx) with images and values
• Zoom into the result image next to the original
■ Points
• 10 free analyses when you sign up
• Top up 10 or 100 at a time, as much as you need
■ Also
• Korean, English, Japanese
• Sign in with Apple, Google or email
• Dark mode
The marker can be printed from "Marker Guide" inside the app. Acceptable crack widths depend on the structure, environment and design code, so the app does not grade severity — it shows you the measurement.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
Crack Detector has been rebuilt from the ground up. It is faster and lighter.
• Dashboard — width distribution, site comparison, widest cracks and monthly trend on one screen
• Site view — pick a site and see all of its measurements
• Map — measurements at the same spot are grouped, and the map opens right where you measured
• Point history marks measurements that were deleted
• Marker guide and help are one tap away from the dashboard
• Pull to refresh, dark mode, improved English and Japanese
Your account and measurements carry over. The marker guide and help moved under Settings.
The developer, Byungil Park, 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 Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Contact Info
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Byungil Park
- Size
- 5.9 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 and 2 more
- English, Japanese, Korean
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Use crack detection 10 times £4.99
- Use crack detection 100 times £44.99
- Copyright
- © @Practical. Inc