# Sumhow — A calculator that fights back

> A calculator that fights back (iPhone/iPad app by Timothy Palladino.)

- Source: https://appshunter.io/ios/app/sumhow/id6808482763 (this page in markdown: same URL + `.md`)
- Developer: [Timothy Palladino](https://appshunter.io/developer/6794749742)
- Category: Games, Casual, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 16 MB
- Languages: American English
- Released: 2026-09-21
- Data updated: 2026-10-10

## What is Sumhow?

Somebody left you a calculator. Most of the keys are gone.

Sumhow hands you a target and a handful of surviving keys, and asks you to make the number anyway. Three, plus and times are enough to get started. Then the machine starts changing the rules on you.

HOW IT PLAYS
• Every unit has a par: the fewest presses it can possibly be done in. Match it for three stars.
• The machine resolves left to right, with no order of operations. On this unit, 3 + 4 × 2 is 14.
• Undo and Clear are free, so experiment. There are no timers, no lives and no fail state.

TEN CHAPTERS, ONE RULE EACH
Roots, where √ only lands on whole numbers. Echo, where equals repeats the last operation. Decay, where the × key dies after two uses. Stutter, Memory, Wraparound, The Toll, Below Zero, Blind. And Word Mode: ninety-six trivia questions whose answers you spell by typing the number that reads as the word when the screen is upside down.

The first four chapters are free. Each of the ten that follow is a single purchase, or earn it: every unit in a chapter at three stars pays for the next one in gold.

HINTS THAT COST SOMETHING
A nudge shows your next press. A route shows the whole solution. Both cost gold and cap the stars you can earn on that unit, so a hint is a choice, not a shortcut.

SKINS
Wear the calculator you want. Forty-three skins in seven packs, from leopard print to a synthwave sunset, tried on before you buy.

THE QUIET PART
The unit reacts to certain numbers. None of them are listed. Scratch mode is a fully working calculator with no target; that is where you go looking. Find enough and a chapter opens that is not for sale.

No ads. No account. No energy meter. Just a calculator with a problem, and you.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Chapter 8: The Toll | $4.99 | one-time |
| Chapter 7: Word Mode | $4.99 | one-time |
| Chapter 6: Wraparound | $4.99 | one-time |
| Skins: Café | $1.99 | one-time |
| Desk skin pack | $1.99 | one-time |
| 80s skin pack | $1.99 | one-time |
| Night Shift skin pack | $1.99 | one-time |
| Seaside skin pack | $1.99 | one-time |
| Wild skin pack | $1.99 | one-time |
| Sweet Shop skin pack | $1.99 | one-time |


## Is Sumhow safe?

Not enough ratings yet to assess Sumhow.

## Is Sumhow legit?

Sumhow has limited verification signals. The AppsHunter Legitimacy Score for Sumhow is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-09-21

No release notes.

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## More apps by Timothy Palladino

- [CastleWise](https://appshunter.io/ios/app/castlewise/id6794749740)

All apps by Timothy Palladino: https://appshunter.io/developer/6794749742

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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 2026-10-10.*