| Name | Description | Type | Package | Framework |
| ABANumberCheckDigit | Modulus 10 ABA Number (or Routing Transit Number (RTN)) Check Digit calculation/validation. | Class | org.apache.commons.validator.routines.checkdigit | Apache Commons |
| CheckDigit | Check Digit calculation and validation. | Interface | org.apache.commons.validator.routines.checkdigit | Apache Commons |
| CheckDigitException | Check Digit calculation/validation error. | Class | org.apache.commons.validator.routines.checkdigit | Apache Commons |
| CUSIPCheckDigit | Modulus 10 CUSIP (North American Securities) Check Digit calculation/validation. | Class | org.apache.commons.validator.routines.checkdigit | Apache Commons |
| EAN13CheckDigit | Modulus 10 EAN-13 / UPC / ISBN-13 Check Digit calculation/validation. | Class | org.apache.commons.validator.routines.checkdigit | Apache Commons |
| IBANCheckDigit | IBAN (International Bank Account Number) Check Digit calculation/validation. | Class | org.apache.commons.validator.routines.checkdigit | Apache Commons |
| ISBN10CheckDigit | Modulus 11 ISBN-10 Check Digit calculation/validation. | Class | org.apache.commons.validator.routines.checkdigit | Apache Commons |
| ISBNCheckDigit | Combined ISBN-10 / ISBN-13 Check Digit calculation/validation. | Class | org.apache.commons.validator.routines.checkdigit | Apache Commons |
| ISINCheckDigit | Modulus 10 ISIN (International Securities Identifying Number) Check Digit calculation/validation. | Class | org.apache.commons.validator.routines.checkdigit | Apache Commons |
| ISSNCheckDigit | International Standard Serial Number (ISSN) is an eight-digit serial number used to | Class | org.apache.commons.validator.routines.checkdigit | Apache Commons |
| LuhnCheckDigit | Modulus 10 Luhn Check Digit calculation/validation. | Class | org.apache.commons.validator.routines.checkdigit | Apache Commons |
| ModulusCheckDigit | Abstract Modulus Check digit calculation/validation. | Class | org.apache.commons.validator.routines.checkdigit | Apache Commons |
| SedolCheckDigit | Modulus 10 SEDOL (UK Securities) Check Digit calculation/validation. | Class | org.apache.commons.validator.routines.checkdigit | Apache Commons |
| VerhoeffCheckDigit | Verhoeff (Dihedral) Check Digit calculation/validation. | Class | org.apache.commons.validator.routines.checkdigit | Apache Commons |