Credit Card Number Validator by Daily Working Tools is a free application available for Android 9.0 and above. This app allows you to check your card number and specify the type of card. The algorithm used in this app is the Luhn algorithm, also known as the "modulus 10" algorithm, which is a simple checksum formula used to validate a variety of identification numbers, including credit card numbers, IMEI numbers, and more.

With Credit Card Number Validator, you can easily check if your card number is valid and specify the type of card. This app supports various card types, including Visa, MasterCard, Amex, BankCard, Dankort, DinersClub, Discover, JCB, and Switch/Solo. One of the best things about this app is that it does not collect, store, or send any entered card number, ensuring your privacy and security.

Overall, if you are looking for a simple and easy-to-use app to check your card number's validity and type, Credit Card Number Validator is a great option. It is free, efficient, and does not compromise your privacy and security.