# Slide Rule

> Digital simulation of a mechanical analog computer for scientific calculations. (iPhone/iPad app by Masayuki Akamatsu.)

- Source: https://appshunter.io/ios/app/slide-rule/id288454455 (this page in markdown: same URL + `.md`)
- Developer: [Masayuki Akamatsu](https://appshunter.io/developer/284722836)
- Category: Productivity, Utilities
- Price: $0.99
- Rating: 1.00/5 from 1 App Store ratings · 24 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 3 MB
- Languages: American English, Japanese
- Released: 2019-02-11
- Data updated: 2026-09-01
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/slide-rule/id288454455/reviews.md

## What is Slide Rule?

This app is a slide rule simulator. The slide rule (a.k.a. slipstick) is an mechanical analog computer which was formerly used for various scientific calculations, engineering design and surveying. It consists of three linear strips and a sliding cursor and is used for multiplication, division, square, cube, square root, cubic root, trigonometry, logarithm and so on. Please note that trigonometry and logarithm are not supported and the width of the scale is 1,000 pixels in this version.

## Key features

- Multiplication and division
- Square and cube roots
- Trigonometry functions
- Logarithm calculations
- Digital slide rule simulation
- Mechanical analog computer

## Recent user reviews (10 of 24)

All indexed reviews: https://appshunter.io/ios/app/slide-rule/id288454455/reviews.md

### 1/5 — Freezes

*2021-10-06*

Freezes up regarding easy exit

### 5/5 — ありがとう

*2016-06-05*

6sで動くようになりました。また、以前より良くないました。

### 5/5 — 見事!!

*2014-11-15*

これは見事です。

### 5/5 — これはいい

*2013-07-04*

iPhoneで計算尺を使って計算ができるなんて最高！
log、sin、tanも追加願います。

### 5/5 — what?!? no log or trig?!?

*2012-02-29*

no log, no star!!

(j/k)

### 1/5 — Feature Request

*2011-05-11*

Would like the slide rule to remember its position (calculation) when leaving and returning to it.

Would like to be able to rotate to all four orientations.

Would like support for full ipad resolution.

Please continue compatibility with iOs 3.1.x

If I put a value of 4 on B scale under 2 on A scale and look at B scale under 5 on A scale, it does not quite line up to the expected value of 10.

Looking forward to these modifications to upgrade my rating to 5 stars.

Thank you.

### 4/5 — 二点だけ改善希望

*2011-04-15*

素晴らしいアプリをありがとうございます。ipodtouch（late009）で利用しています。二点だけ改善希望があります。
1．画面内に即座にカーソルを移動する機能
2．カーソルをスライドさせると尺全体がスクロールする機能
この2つの機能が揃えば断然使いやすくなると思います。

ご一考くださいませ。

### 1/5 — Needs fixing

*2011-03-18*

The D scale is wrong. The spacing after pi is wrong, so the C and D scales cannot line up.  Pass this by until it is fixed. Pray for Japan.

### 4/5 — とても良いです

*2011-02-16*

2011年現在、ヘンミ製計算尺が生産されていない為、とても感動を覚えたアプリです！感謝！

要望としては、他の方が言う様に、色々な計算尺が有ったように、単位や目盛りのサイズなどを好みで設定変更できる様にしてもらいたいです〜
よろしくお願いします

### 4/5 — 素晴らしいです

*2011-01-06*

高解像ディスプレイに対応して、メモリがピタッと決まるようになりました。指を離す時に滑尺が微妙にうごいてしまうのは、インターフェースで改善できないでしょうか？滑尺をロックするボタンを設けるとか…。あと、他の方も書かれてますが、尺の種類が増えるといいですね。更なるバージョンアップに期待します。

## Frequently asked questions about Slide Rule

### What calculations can Slide Rule perform?

Slide Rule can perform multiplication, division, square roots, cube roots, trigonometry, and logarithm calculations. The width of the scale is 1,000 pixels in this version.

### Is Slide Rule available for free?

No, Slide Rule is a paid application. It is priced at $0.99 and is available for iPhone, iPad, and iPod.

### What devices support Slide Rule?

Slide Rule is compatible with iPhone, iPad, and iPod devices. It requires iOS 4.0 or later.

### How often is Slide Rule updated?

The latest version of Slide Rule is 2.5, last updated on September 17, 2025. The app was initially released on February 11, 2019.

### What is the age rating for Slide Rule?

Slide Rule has an age rating of 4+, making it suitable for a wide range of users including younger learners.

### Does Slide Rule have ads?

The provided data does not specify if Slide Rule contains advertisements. However, it is a paid application, which often implies an ad-free experience.

### What is the user sentiment for Slide Rule?

Based on the available data, Slide Rule has a rating of 1.0 stars from 1 rating, indicating a very low user satisfaction score.

### Can Slide Rule be used offline?

As a simulator of a mechanical analog computer, Slide Rule is designed to function without an internet connection, allowing for offline calculations.

## Version history (last 5 releases)

### 2.5.2 — 2026-08-20

Now takes advantage of ProMotion displays. Dragging the scales and cursor is rendered at up to 120fps for a smoother, more responsive feel.

### 2.5.1 — 2026-07-19

Minor bugs have been fixed.

### 2.5 — 2025-09-17

- Now compatible with the latest OS.
- The screen layout has been updated.

### 2.0.0 — 2019-02-11

This app has been updated by Apple to display the Apple Watch app icon.

- Supported iPad

### 1.1.0 — 2011-01-06

- iOS 4.0 compatible
- Retina Display Compatible

## Apps similar to Slide Rule

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [RPN-45 SD](https://appshunter.io/ios/app/rpn-45-sd/id509923051) | 4.3 (15) | $1.99 | Productivity |
| [PointAnimate - Point Cloud VFX](https://appshunter.io/ios/app/pointanimate-point-cloud-vfx/id6757523290) | 5.0 (1) | Free | Productivity |
| [ときメモ - 時間記録 /  作業記録 / 作業管理](https://appshunter.io/ios/app/id6478070261) | — | Free | Productivity |
| [Solar Panel Calculator Plus](https://appshunter.io/ios/app/solar-panel-calculator-plus/id1358184660) | 3.3 (23) | $2.99 | Productivity |
| [Time Keeper with Progress](https://appshunter.io/ios/app/time-keeper-with-progress/id6670522060) | — | Free | Productivity |
| [eModulex](https://appshunter.io/ios/app/emodulex/id6443797534) | 5.0 (2) | Free | Productivity |

## More apps by Masayuki Akamatsu

- [Yes\|No Free](https://appshunter.io/ios/app/yesno-free/id284722833)
- [Alarm Free](https://appshunter.io/ios/app/alarm-free/id284728433)
- [Compass Free](https://appshunter.io/ios/app/compass-free/id284735786)
- [picocalc](https://appshunter.io/ios/app/picocalc/id284740333)
- [Gengou Lib](https://appshunter.io/ios/app/gengou-lib/id284830543)
- [T4Two](https://appshunter.io/ios/app/t4two/id284910005)

All apps by Masayuki Akamatsu: https://appshunter.io/developer/284722836

## Related topics

[digital slide rule](https://appshunter.io/ios/topics/digital-slide-rule) · [slide rule](https://appshunter.io/ios/topics/slide-rule) · [pocket slide rule expert](https://appshunter.io/ios/topics/pocket-slide-rule-expert) · [smart slide rule](https://appshunter.io/ios/topics/smart-slide-rule)

---

*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 2026-09-01.*