# Rotary calculator vs Simple Relationship Map

The clearest difference is in-app purchases: Rotary calculator at none against Simple Relationship Map's 2. Simple Relationship Map's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Simple Relationship Map sells 2 in-app purchases, starting at $2.99 per month. Rotary calculator asks for nothing beyond the download.

Rotary calculator ships an update every 2 weeks, Simple Relationship Map fortnightly. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Rotary calculator | Simple Relationship Map |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Fortnightly |
| Monetization | — | Freemium |
| Size | 35 MB | 49 MB |
| Requires iOS | 15.8.3 | **15.6** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [YUKI TANAIKE](https://appshunter.io/developer/478558546) |

## What reviewers say

### Rotary calculator

[App page](https://appshunter.io/ios/app/rotary-calculator/id6499560600)

**Features:** macOS Compatibility

**In-app purchases:** none


### Simple Relationship Map

[App page](https://appshunter.io/ios/app/simple-relationship-map/id6746087402)

Easily create visual maps of relationships, organizations, networks, and more on your smartphone or tablet. Supports colors, images, links, and notes for rich expression. Export and share your creations, or edit them on a PC.

**Highlights:** Intuitive map editing, Customizable item colors, Insert links and notes, Export and share maps, Import and edit files, Dark theme support, No account registration required

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Relationship Map Pro (Monthly) | $2.99 | per month |
| Relationship Map Pro (Annual) | $27.00 | per year |


## Frequently asked questions

### Is Rotary calculator free?

Rotary calculator is free to download, with no in-app purchases.

### Is Simple Relationship Map free?

Simple Relationship Map is free to download, with in-app purchases available.

### Do Rotary calculator or Simple Relationship Map have ads?

Rotary calculator shows ads; Simple Relationship Map does not.

### Which is updated more often, Rotary calculator or Simple Relationship Map?

Rotary calculator ships an update every 2 weeks, and Simple Relationship Map fortnightly. Most recently, Rotary calculator was updated on October 27, 2026 and Simple Relationship Map on October 25, 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.*