Doui Lab Product

Ultra Simple Expense Log

An expense app built for one fast action: enter an amount and record it. Extra input stays optional, while the dashboard is designed to help you notice patterns later.

Fast Entry Local Storage Clear Trends

What kind of app it is

It is made for people who stop using complicated budgeting apps. You can record an amount first, then add a category or note later if you want. Data stays on the device.

What it does
  • Record spending quickly with amount-first entry.
  • Edit category, note, and payment method later.
  • Review trends by day, weekday, time, and amount range.
Design direction
  • The recording flow is intentionally short.
  • Categories stay lightweight and optional.
  • Local-first storage is the default approach.
Release status
  • The app is now live on the App Store.
  • The support and privacy pages are already published.
  • This page now includes the App Store link and QR code.

How it works

The default flow is short: enter an amount, record it, and add detail only when it helps.

01 Enter an amount

The input is ready right after launch. Currency and closing day can be set up in advance.

02 Record it

Save immediately, or add a category and note if you want more detail on that entry.

03 Review later

Use history and the dashboard to see when and how much you tend to spend.