# Just a Calculator - That Works — It calculates. Correctly.

> It calculates. Correctly. (iPhone/iPad app by Yuichi Ono.)

- Source: https://appshunter.io/ios/app/just-a-calculator-that-works/id6811397340 (this page in markdown: same URL + `.md`)
- Developer: [Yuichi Ono](https://appshunter.io/developer/1871280285)
- Category: Utilities, Sports
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 10 MB
- Languages: American English, Japanese
- Released: 2026-09-25
- Data updated: 2026-10-03

## What is Just a Calculator?

Just a Calculator is built to add, subtract, multiply, divide—and get the answer right.

CALCULATOR ESSENTIALS
• Addition, subtraction, multiplication, and division
• Percentages, square roots, tax in/out, memory, and grand total
• Up to 12 integer digits, decimal display, and scientific notation
• Decimal arithmetic that avoids familiar binary floating-point surprises in money calculations
• F / 4 / 3 / 2 / 1 / 0 / ADD2 decimal settings
• CUT / 5/4 / UP rounding modes
• Save and switch between up to three tax rates

CLEAR INPUT AND RESULTS
Thousands separators appear naturally while you type. Results use a monospaced display with a slashed zero. Copy a result or share it as a clean image.

CALCULATION HISTORY
Save the expression, result, and time on your device. Free use keeps the latest 10 calculations. Ad-Free keeps up to 100 and lets you delete individual entries. The calculator and on-device history work offline.

OLYMPIC GOLF SCORING
Use the standard mode for up to 4 players or the large mode for up to 100. Enter negative scores, calculate totals, averages, and settlements, keep a results history, and share a results image.

Friend Link lets an organizer create an event and invite players with a QR code or invitation code. Participants can share attendance and scores with the organizer. This feature requires an internet connection.

SOUND AND HAPTICS
Configure key sounds and vibration separately. Key sounds respect your device’s Silent Mode.

ADS AND IN-APP PURCHASES
The free version displays ads.

• Ad-Free: a one-time ¥200 purchase in Japan. It permanently removes ads and unlocks additional key sounds.
• Event Plus: ¥200 per month in Japan, automatically renewing. It lets you manage multiple weekend events in the same month. Once purchased, ad-free access remains even after the plan ends.

The local price shown by the App Store applies in each country or region. Event Plus renews automatically unless canceled. You can manage or cancel it in your Apple Account subscription settings.

Privacy Policy:
https://dentaku.otsi.jp/en/privacy/

Terms of Use:
https://dentaku.otsi.jp/en/terms/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Event Plus | $0.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Ad-Free | $0.99 | one-time |


## Is Just a Calculator safe?

Not enough ratings yet to assess Just a Calculator.

## Is Just a Calculator legit?

Just a Calculator - That Works has limited verification signals. The AppsHunter Legitimacy Score for Just a Calculator is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 2 releases)

### 1.1.0 — 2026-09-26

A tax breakdown and a margin mode.

NEW
• Tax breakdown: after TAX+ or TAX−, the line below the result shows the tax amount and the price before or with tax. For example, at a 10% rate, TAX− on 1,000 gives 909 and shows "Tax 91 / With tax 1,000".
• Margin mode: long-press the % key to switch it to MGN (margin). Cost + margin gives the selling price, and price − margin gives the cost. The margin is a share of the selling price: 120 + 25 MGN gives 160, a profit of 40. Long-press again to go back to %.

MINOR FIXES
• The memory value could be lost when you closed the app.
• M+ and M− pressed in the middle of a calculation used the last number entered instead of the result.
• A new calculation started after = picked up the previous result.
• With fixed decimal places, ÷ followed by % could give a wrong answer.

### 1.0.0 — 2026-09-25

No release notes.

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## More apps by Yuichi Ono

- [LusterPicture – Dark Photo Fix](https://appshunter.io/ios/app/lusterpicture-dark-photo-fix/id6758163728)

All apps by Yuichi Ono: https://appshunter.io/developer/1871280285

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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 2026-10-03.*