# Slide Rule vs ReunionTouch

The clearest difference is rating: ReunionTouch at 3.7 against Slide Rule's 1.0. ReunionTouch also leads on update cadence (every 2 months vs every 29 months) and ratings volume (56 vs 1). Slide Rule's advantage is price ($0.99 vs $9.99) and review sentiment (75% vs 46%). On ads, in-app purchases and device support there is nothing between them.

Slide Rule costs $0.99 and ReunionTouch $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReunionTouch holds the better App Store score, 3.7 against 1.0. That said, the two scores are not equally well evidenced: ReunionTouch has 56 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 75% of Slide Rule's written reviews are positive against 46% of ReunionTouch's, so the app with the better star average is not the one people write more warmly about.

Slide Rule ships an update every 29 months, ReunionTouch every 2 months. The most recent releases landed on September 21, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Slide Rule | ReunionTouch |
| --- | --- | --- |
| Price | **$0.99** | $9.99 |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/slide-rule/id288454455/reviews) | **[3.7 (56 ratings)](https://appshunter.io/ios/app/reuniontouch/id911358745/reviews)** |
| Number of ratings | 1 | **56** |
| Positive reviews | **75.0% of reviews** | 46.2% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Best chart rank | — | **#199** |
| Size | 3 MB | 48 MB |
| Requires iOS | 17.0 | **13.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Masayuki Akamatsu](https://appshunter.io/developer/284722836) | [Leister Productions, Inc](https://appshunter.io/developer/304374288) |

## What reviewers say

### Slide Rule

[App page](https://appshunter.io/ios/app/slide-rule/id288454455)

Simulates a mechanical analog computer for scientific and engineering calculations. Perform multiplication, division, roots, and trigonometric functions with a digital slide rule.

**Highlights:** Multiplication and division, Square and cube roots, Trigonometry functions, Logarithm calculations, Digital slide rule simulation, Mechanical analog computer

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### ReunionTouch

[App page](https://appshunter.io/ios/app/reuniontouch/id911358745)

**Currently charting:** #199 Top Paid · Productivity (US App Store)

Access and manage your family tree data on your mobile device. Add new individuals, upload photos, document details, and make edits on the go. Changes automatically sync with the desktop version.

**Highlights:** View and navigate family trees, Search family information, Edit data on the go, Add new people and pictures, Automatic syncing with Reunion for Mac, Supports iPhone and iPad screen sizes

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Slide Rule free?

Slide Rule costs $0.99, with no in-app purchases.

### Is ReunionTouch free?

ReunionTouch costs $9.99, with no in-app purchases.

### Which has better reviews, Slide Rule or ReunionTouch?

ReunionTouch is rated higher. Slide Rule averages 1.0 out of 5 from 1 ratings, while ReunionTouch averages 3.7 from 56 ratings.

### Do Slide Rule or ReunionTouch have ads?

Neither Slide Rule nor ReunionTouch shows ads.

### Which is updated more often, Slide Rule or ReunionTouch?

Slide Rule ships an update every 29 months, and ReunionTouch every 2 months. Most recently, Slide Rule was updated on September 21, 2026 and ReunionTouch on September 22, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*