Hi all!

I’d like to share uk_modulus, a small open-source Elixir library for validating UK bank details.

Overview

uk_modulus implements the official UK modulus checking algorithm to validate:

• Sort codes

• Account numbers

It supports the standard MOD10, MOD11, and DBLAL rules, including documented exceptions.

Features

• Validates UK bank account numbers against sort codes
• Ships with official Vocalink data (1,151 weight rules)
• Supports MOD10, MOD11, and DBLAL algorithms
• Handles all Vocalink exceptions (1-14)
• Fast concurrent access via ETS
• Optional auto-update from Vocalink’s website

Motivation

I needed a lightweight, dependency-free way to validate UK bank account details in an Elixir project, so I extracted this logic into a focused library.

Links

GitHub repository (with usage examples and details):

https://github.com/alexfilatov/uk_modulus