# Sumi: Notepad Calculator — Math notes, currency & units

> Math notes, currency & units (iPhone/iPad app by Sigit Kuncoro.)

- Source: https://appshunter.io/ios/app/sumi-notepad-calculator/id6816366548 (this page in markdown: same URL + `.md`)
- Developer: [Sigit Kuncoro](https://appshunter.io/developer/1889728747)
- Category: Utilities, Finance
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 4 MB
- Languages: American English
- Released: 2026-10-01
- Data updated: 2026-10-04
- User reviews in markdown: https://appshunter.io/ios/app/sumi-notepad-calculator/id6816366548/reviews.md

## What is Sumi?

Sumi is a notepad where every line is a calculation. Write "rent = 2450 EUR" and it keeps the number. Write "rent / 4" on the next line and you get each person's share.

I use it for trip budgets, splitting bills with housemates, counting hours for invoices and checking how many days are left until a deadline. It handles currencies, units, time and dates, so you can write things like:

hotel = 128 EUR per night
hotel × 4
prev + 15%
total in usd
8 h × 5 days
days until 25 dec
Rp 150rb × 3

"prev" is the line above and "sum" adds up everything above it. Change one number and the rest update.

Currencies: 18 of them, including USD, EUR, GBP, JPY, IDR, SGD, INR and AUD. Rates are built in, so conversion works offline.

Units: weight, length, volume, area, speed, temperature, data and energy. There's a reference page listing every unit and shortcut, and you can tap an example to add it to your sheet.

Big numbers: 2.5k, 1.2M and 3bn work, and so do rb, jt and miliar if you're used to writing Indonesian amounts. You can also pick how numbers look: 1,234.56, 1 234,56 or 1.234,56.

While you type, the other lines fade back so you can see what you're working on. Hold a result to copy it. Search looks through every sheet, and you can copy a whole sheet as tidy aligned text to paste into a chat.

There's no account and no ads, and nothing is tracked. Your sheets are stored on your phone and don't go anywhere else.

Sumi is free with up to 3 sheets. Sumi Pro is a one-time purchase, with a 7-day free trial and Family Sharing. It adds unlimited sheets, live exchange rates, the Dark, Latte and Mocha themes, pinning a line's result to the bottom bar, sharing sheets as images, and alternate app icons. There's no subscription.

Questions or ideas: hello@trysumi.app


## Version history (last 1 release)

### 1.0 — 2026-10-01

No release notes.

## More apps by Sigit Kuncoro

- [Clipnote: AI Video to Notes](https://appshunter.io/ios/app/clipnote-ai-video-to-notes/id6762003946)

All apps by Sigit Kuncoro: https://appshunter.io/developer/1889728747

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-04.*