# Crack Detector - Crack Gauge — Measure cracks from a photo

> AI-powered app for detecting and measuring cracks in concrete and walls from photos. (iPhone/iPad app by Byungil Park.)

- Source: https://appshunter.io/ios/app/crack-detector-crack-gauge/id1530337221 (this page in markdown: same URL + `.md`)
- Developer: [Byungil Park](https://appshunter.io/developer/318781673)
- Category: Utilities, Productivity
- Price: $4.99 with in-app purchases
- Rating: 1.00/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 6 MB
- Languages: American English, Japanese, Korean
- Released: 2020-09-04
- Data updated: 2026-09-21
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/crack-detector-crack-gauge/id1530337221/reviews.md

## What is Crack Detector?

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.

## Key features

- Automatic crack detection via photos
- Machine learning analysis
- Measures crack thickness and length
- Printable marker for calibration
- Extract specific crack sections

## Pricing and in-app purchases

Base price: $4.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Use crack detection 100 times | $24.99 | one-time |
| Use crack detection 10 times | $2.99 | one-time |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/crack-detector-crack-gauge/id1530337221/reviews.md

### 4/5 — 구매를 못해요

*2026-09-08*

앱을 더사용하고싶은데 구매가 안됩니다.

### 1/5 — Scam

*2025-09-19*

Scam

## Frequently asked questions about Crack Detector

### How does Crack Detector find cracks?

Crack Detector uses machine learning to analyze photos taken with your smartphone camera. It automatically identifies the location, thickness, and length of cracks in concrete and walls.

### Can Crack Detector measure cracks accurately?

Yes, Crack Detector can measure crack thickness and length. For enhanced precision, you can use printable markers that you attach to the surface and input their size into the app's setup.

### What devices does Crack Detector support?

Crack Detector is available for iPhone and iPod devices. It is designed for iOS users who need a portable crack analysis solution.

### What is the price of Crack Detector?

Crack Detector is a paid application, available for a one-time purchase of $2.99. This price grants you access to all its crack detection and measurement features.

### How often is Crack Detector updated?

The latest version of Crack Detector, 3.1.0, was released on March 29, 2024. Updates typically include improvements to the detection algorithms and user interface.

### What is the age rating for Crack Detector?

Crack Detector has an age rating of 4+, indicating it is suitable for users of all ages. The app's functionality does not involve mature or inappropriate content.

### Does Crack Detector have ads?

No, Crack Detector does not contain advertisements. As a paid application, it offers an uninterrupted user experience focused solely on its utility features.

### What do users think of Crack Detector?

Based on the available data, Crack Detector has received one rating of 1.0 stars. Further user feedback would be needed to understand common sentiments or issues.

## Version history (last 5 releases)

### 4.0.0 — 2026-09-17

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.

### 3.1.0 — 2024-03-29

Provides markers that can be printed on a printer

### 3.0.1 — 2023-09-01

Error corrected.

### 3.0.0 — 2023-08-31

Machine learning technology is used to find cracks more accurately

### 2.1.0 — 2022-06-22

허용균열폭 기준 설정 기능이 추가 되었습니다.

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## More apps by Byungil Park

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All apps by Byungil Park: https://appshunter.io/developer/318781673

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-21.*