# History Calculator -zen- — History access&Formula view

> A calculator that displays formulas, respects operator priority, and allows editing of calculation history. (iPhone/iPad app by Akito Ibaraki.)

- Source: https://appshunter.io/ios/app/history-calculator-zen/id1452124003 (this page in markdown: same URL + `.md`)
- Developer: [Akito Ibaraki](https://appshunter.io/developer/1451523461)
- Category: Productivity, Business
- Price: Free
- Rating: 4.40/5 from 5 App Store ratings
- Age rating: 4+
- Requires: iOS 9.0 · 23 MB
- Languages: English
- Released: 2019-02-12
- Data updated: 2026-06-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/history-calculator-zen/id1452124003/reviews.md

## What is History Calculator?

History calculator -zen- is a revolutionary easy-to-use calculator.

■ You can see the formula.
You can see the expression you are editing. Calculate by pressing "=".

■ Calculate according to operator priority.
Calculate first in parentheses. Multiplication / division is priority to addition / subtraction.

■ Calculation history can be edit.
You can recalculate past calculation contents.
Use the ARROW button to move the cursor, delete numbers at the cursor position, and insert numbers and symbols.

■ Advertisement is displayed.

■Disclaimer
Although I am making every effort to make the calculation results done with this App, I do not guarantee its accuracy. Please understand that I will not assume any responsibility for damage, loss, disadvantage, etc. caused in using this App.

## Key features

- Formula display
- Operator priority calculation
- Editable calculation history
- Recalculate past entries
- Cursor navigation for editing


## Frequently asked questions about History Calculator

### Does History Calculator -zen- have ads?

Yes, History Calculator -zen- displays advertisements within the application.

### What is the accuracy of History Calculator -zen-?

The developer makes every effort to ensure accuracy but does not guarantee calculation results. Users should understand that the developer assumes no responsibility for any damages or losses incurred from using the app.

### Can I edit previous calculations in History Calculator -zen-?

Yes, you can edit past calculation contents in History Calculator -zen-. You can use the arrow buttons to move the cursor, delete, and insert numbers and symbols to modify previous entries.

### How does History Calculator -zen- handle operator priority?

History Calculator -zen- calculates according to operator priority. It first calculates expressions within parentheses, and multiplication/division take priority over addition/subtraction.

### What devices is History Calculator -zen- available on?

History Calculator -zen- is available on iPhone, iPad, and iPod devices.

### When was History Calculator -zen- last updated?

The latest version of History Calculator -zen- was updated on April 23, 2019.

### What is the age rating for History Calculator -zen-?

History Calculator -zen- has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 4 releases)

### 1.0.3 — 2019-04-23

layout adjust

### 1.0.2 — 2019-03-08

expand iOS version

### 1.0.1 — 2019-02-19

Memory function implementation
Layout adjustment on iPad
Fine brush up

### 1.0 — 2019-02-11

No release notes.

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## More apps by Akito Ibaraki

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- [StuLOG](https://appshunter.io/ios/app/stulog/id1461679466)

All apps by Akito Ibaraki: https://appshunter.io/developer/1451523461

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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 2026-06-11.*