Local-first expense PWA

Expleu

A client-only expense and payment tracker that keeps recurring obligations, due dates and completion history on the user’s device.

Context: Independent product
Date / status: 2026
Work: Local-first expense PWA

Three Expleu mobile screens showing the dashboard, expense list and local data settings — Dashboard, payment list and settings cover the complete mobile flow: review what is due, manage recurring expenses and control local backups.

The problem

Expense tracking should be quick enough to use on a phone without requiring an account or handing personal financial data to a server. The interface also needed to make overdue, upcoming, recurring and completed payments understandable at a glance.

Scope and architecture

My responsibilities

Product definition and mobile interface design
React application development
PWA and service-worker setup
Local persistence, backup and restore flows

System

Client-only React single-page application
IndexedDB-backed browser-local storage
Web app manifest and service worker
No application server, accounts or remote database

Key decisions

01
Keep financial data on the device.
Expense records live in browser-local storage rather than a hosted account. The application can deliver its core value without collecting personal financial information or maintaining an authentication system.
02
Organize the interface around time and urgency.
The dashboard separates overdue, today, this week and all pending amounts, while the payment list adds day, week, month and year views for more deliberate planning.
03
Make local-first data portable.
JSON export and import provide a clear recovery and transfer path, while the settings screen keeps reminders and permanent deletion under the user’s control.

What I built

I built Expleu as a client-only React application with an installable PWA shell, service worker and on-device persistence. It supports one-off and recurring expenses, due-state summaries, day-to-year filtering, completion tracking, local notifications, and JSON backup and restore. No application backend or user account is required.

React
JavaScript
PWA
IndexedDB
Service worker

Result

Private, installable expense tracking without accounts or server-side storage

Financial records remain in browser-local storage on the user’s device
Installable mobile experience with recurring schedules and due-state reminders
Portable JSON backup and restore without a hosted account

Open Expleu

The problem

Scope and architecture

My responsibilities

System

Key decisions

Keep financial data on the device.

Organize the interface around time and urgency.

Make local-first data portable.

What I built

Result

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