Clarity in a finance app starts with the ledger

Represent the amount and its currency together

Finerva moves money as integer minor-unit strings paired with a currency. Integer and decimal arithmetic preserve amounts across transactions, transfers and reports; visual formatting stays separate from the financial rules.

Connect the interface to a coherent local ledger

An encrypted on-device database holds the working ledger. Related changes are applied together through a serialized writer, and local projections support the interface. Synchronization uses versioned outbox mutations and an incremental change feed.

Keep shared costs separate from personal finances

The shared split engine handles allocations across client and server. Membership checks and private account mappings keep group expenses and settlements distinct from a person’s own ledger.

The product behind the decisions

Finerva

Everyday finances, brought into focus. Accounts, expenses, plans, and shared costs in one considered mobile experience.

Inside the product