# checkdgt - Check Digit Generator and Validation

> Check digit generator and validator for algorithms, barcodes, VINs, and credit cards. (iPhone/iPad app by Andrew Scott.)

- Source: https://appshunter.io/ios/app/checkdgt-check-digit-generator-and-validation/id981008681 (this page in markdown: same URL + `.md`)
- Developer: [Andrew Scott](https://appshunter.io/developer/972402841)
- Category: Productivity, Education
- Price: $0.99
- Rating: 2.30/5 from 8 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 10.0 · 25 MB
- Languages: American English
- Released: 2015-06-06
- Data updated: 2026-08-01
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/checkdgt-check-digit-generator-and-validation/id981008681/reviews.md

## What is checkdgt?

checkdgt v1.3

checkdgt is a feature-rich checksum/check digit tool that includes verification/generation tools for many commonly used algorithms such as Luhn, Verhoeff, and Damm.  There are also tools to generate and verify credit card numbers, scan and search UPC barcodes and ISBN barcodes, and verify Vehicle Identification Numbers (VIN).  

checkdgt is an excellent solution for Software Testers who need valid test credit card numbers to use in testing, as well as anyone interested in learning about or testing many other check digit systems. Each check digit system also includes a short summary of its uses and how the check digit is calculated. 

Additional utilities include a QR code scanner and ISBN/UPC product search. 

NOTE: Credit card generation functionality should only be used for testing and educational purposes, do not attempt to use the numbers generated by this app to make purchases.

## Key features

- Check digit generation and verification
- Luhn, Verhoeff, Damm algorithm support
- Credit card number validation
- UPC and ISBN barcode scanning
- VIN verification
- QR code scanner
- Product search

## Chart rankings

- #182 in Top Paid · Productivity (US App Store)

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/checkdgt-check-digit-generator-and-validation/id981008681/reviews.md

### 1/5 — Unhappy

*2019-12-31*

I would like to get a refund 
Thank you..

### 1/5 — Refund

*2019-09-22*

Want a refund

### 1/5 — Refund

*2019-03-09*

I want a refund

### 1/5 — Worst ever

*2018-06-27*

I want a refund.

## Frequently asked questions about checkdgt

### What is checkdgt used for?

checkdgt is used to generate and validate check digits for various algorithms, verify credit card numbers, scan barcodes (UPC, ISBN), and check Vehicle Identification Numbers (VINs). It's helpful for software testing and educational purposes.

### Does checkdgt have ads?

No, checkdgt does not contain advertisements. It is a paid application with no ads.

### What algorithms does checkdgt support?

checkdgt supports several commonly used algorithms including Luhn, Verhoeff, and Damm. It also provides summaries of their uses and calculation methods.

### Can I use checkdgt to generate real credit card numbers?

No, the credit card generation functionality in checkdgt is strictly for testing and educational purposes. Do not attempt to use generated numbers for actual purchases.

### What devices does checkdgt support?

checkdgt is supported on iPhone and iPod devices. It is designed for iOS.

### When was checkdgt last updated?

The latest version of checkdgt is 1.3, which was last updated on December 13, 2016. The app was initially released on June 6, 2015.

### What is the price of checkdgt?

checkdgt is available for a one-time purchase of $0.99. There are no subscription fees or in-app purchases.

### What is the age rating for checkdgt?

checkdgt has an age rating of 4+, making it suitable for a wide range of users. The app's content is considered appropriate for children and adults.

## Version history (last 4 releases)

### 1.3 — 2016-12-13

This update from Apple will improve the functionality of this app. No new features are included.

- Fixes for iOS 10
- Minor text changes

### 1.2 — 2015-08-25

- Fix for occasional crash on versions newer than 8.3
- Minor card generation fix

### 1.1 — 2015-07-06

- Bug fixes

### 1.0 — 2015-06-05

No release notes.

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## More apps by Andrew Scott

- [LiteLing - Study and Learn Polish](https://appshunter.io/ios/app/liteling-study-and-learn-polish/id1191399993)

All apps by Andrew Scott: https://appshunter.io/developer/972402841

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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 2026-08-01.*