Expense Splitter Matrix – Advanced group billing with matrix logic and full privacy

Summary: Expense Splitter Matrix uses a grid-based system to manage complex group expenses with precise dollar or percentage splits. It operates entirely client-side, saving data locally without accounts or servers, ensuring user privacy.

What it does

It centralizes all group expenses in a single structured table, allowing users to apply custom split logic per person and visualize the entire billing matrix on one screen. Data can be saved and loaded as local JSON files.

Who it's for

It is designed for groups needing detailed, flexible expense tracking beyond simple splits, such as trips or shared bills with varied payment arrangements.

Why it matters

It solves the problem of fragmented expense data and complex splits while maintaining privacy by avoiding servers and accounts.