# Real-time Heron Calculator

> Real-time triangle area calculator using Heron's formula with graphical visualization. (iPhone/iPad app by Takeru Yui.)

- Source: https://appshunter.io/ios/app/real-time-heron-calculator/id955414486 (this page in markdown: same URL + `.md`)
- Developer: [Takeru Yui](https://appshunter.io/developer/955414485)
- Category: Productivity, Business
- Price: Free
- Age rating: 4+
- Requires: iOS 12.0 · 69 MB
- Languages: American English, Japanese
- Released: 2015-01-14
- Data updated: 2026-06-25
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/real-time-heron-calculator/id955414486/reviews.md

## What is Real?

Divide the area of a triangle using Heron's formula.
The lengths of the sides can be changed intuitively, and the results are immediately displayed graphically!
Eliminates tedious manual calculations during site work. Ideal for construction site support!

The lengths of the sides can be changed immediately at the touch of a button, and the calculation results are immediately reflected on the screen.
In addition, the actual triangle shape can be checked with the triangle in the center.

Optionally, the following can be changed
The value that can be raised or lowered at the touch of a button.
The number of decimal places to be displayed
Toggle decimal point calculation (rounding up, rounding down, rounding off, JIS rounding)

This application was created using Unity.


Various other updates are planned upon request.

## Key features

- Heron's formula for triangle area
- Real-time graphical updates
- Intuitive side length adjustment
- Customizable decimal places
- Multiple rounding options
- Ideal for construction sites

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/real-time-heron-calculator/id955414486/reviews.md

### 5/5 — 良い

*2022-03-06, version 1.1*

なかなか便利

### 5/5 — 便利

*2022-03-06, version 1.1*

見えやすいし、細かい設定が出来るのがうれしい

### 2/5 — 便利なんだけど

*2019-12-20, version 1.1*

数値を入れる前提である電卓なのに、キーボードが文字変換にいちいち戻るのはなんとかしないと、イライラする。

### 5/5 — 三角形が数値により変形！！

*2015-02-04, version 1.0.0*

三角形が求積に合わせて変形してくれるのでわかりやすい。

## Frequently asked questions about Real

### Does Heron Calculator have ads?

Yes, Heron Calculator contains advertisements. This allows the app to remain free for users.

### What is Heron Calculator used for?

Heron Calculator is used to divide the area of a triangle using Heron's formula. It provides real-time graphical updates as side lengths are adjusted, making it useful for on-site calculations.

### Can I customize the decimal display in Heron Calculator?

Yes, you can change the number of decimal places displayed in Heron Calculator. The app also offers various rounding options like rounding up, rounding down, rounding off, and JIS rounding.

### What devices is Heron Calculator available on?

Heron Calculator is available on iPhone, iPad, and iPod. It is designed for iOS devices.

### How often is Heron Calculator updated?

The latest version of Heron Calculator is 2.0.2, last updated on January 26, 2026. The developer plans various other updates upon request.

### What is the age rating for Heron Calculator?

Heron Calculator has an age rating of 4+, indicating it is suitable for children and adults.

### Can Heron Calculator be used offline?

The provided data does not specify if Heron Calculator can be used offline. However, its core functionality of calculation and graphical display is likely to work without an internet connection.

## Version history (last 5 releases)

### 2.0.2 — 2026-01-26

Improved operational stability.

### 2.0.1 — 2025-07-29

We've fixed some minor bugs to improve your experience.

### 2.0.0 — 2024-07-19

- We have addressed this issue for users subject to the General Data Protection Regulation (GDPR).
- Adjustments were made to the overall appearance.

### 1.1 — 2015-10-24

このAppはApple Watch Appのアイコンを表示するようAppleにより更新されました。

・広告を追加

### 1.0.0 — 2015-01-13

No release notes.

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## More apps by Takeru Yui

- [Remove The Hook](https://appshunter.io/ios/app/remove-the-hook/id1051595010)
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- [MOTCHIMAN : MochiMotchinPunch](https://appshunter.io/ios/app/motchiman-mochimotchinpunch/id1478378442)

All apps by Takeru Yui: https://appshunter.io/developer/955414485

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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 2026-06-25.*