# Stair Calculator vs Arch Radius

The clearest difference is price: Stair Calculator at Free against Arch Radius's $0.99. Stair Calculator also leads on rating (4.1 vs 1.0) and ratings volume (740 vs 1). Arch Radius's advantage is in-app purchases (none vs 2) and iOS requirement (12.0 vs 15.0). On ads and device support there is nothing between them.

Stair Calculator is free to download; Arch Radius costs $0.99 up front. Stair Calculator sells 2 in-app purchases, starting at $9.99 per year. Arch Radius asks for nothing beyond the download.

Stair Calculator holds the better App Store score, 4.1 against 1.0. That said, the two scores are not equally well evidenced: Stair Calculator has 740 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 21% of Stair Calculator's written reviews are positive against 0% of Arch Radius's.

## The numbers

| Metric | Stair Calculator | Arch Radius |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.1 (740 ratings)](https://appshunter.io/ios/app/stair-calculator-construction/id1493037366/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/arch-radius/id6449305148/reviews) |
| Number of ratings | **740** | 1 |
| Positive reviews | **21.4% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 1 MB | 26 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Phan Nhat Đang](https://appshunter.io/developer/1437390098) | [Guido Lemmens](https://appshunter.io/developer/493248169) |

## What reviewers say

### Stair Calculator

[App page](https://appshunter.io/ios/app/stair-calculator-construction/id1493037366)

This app calculates essential parameters for stair construction, offering flexibility in input and providing multiple step set options. It supports various units and allows results to be easily copied.

**Highlights:** Calculate stair construction parameters, Flexible input for Run or Total Run, Determine largest and smallest step sets, Support for various units, Copy results to clipboard

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Premium Package | $9.99 | per year |
| Unlock all features | $5.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Helpful information
- 🚀 Provides useful calculations

**What reviewers complain about**

- 🐛 Doesn't work as expected
- 🔒 No way to cancel subscription
- 🔒 Difficult to cancel trial
- 🤬 Obnoxious ads
- 🤬 Misleading as a learning tool

**Reported bugs**

- Subscription numbers don't add up
- Doesn't provide promised features after purchase

**Requested features**

- Option to uninstall app
- Ability to calculate run based on rise and landing space
- Provide more detailed diagrams and visuals


### Arch Radius

[App page](https://appshunter.io/ios/app/arch-radius/id6449305148)

Calculate the radius of an arch by inputting its width and height. This utility app saves your data for future reference, making it a handy tool for construction professionals.

**Highlights:** Calculate arch radius, Input width (chord) and height, Save data for later use, Designed for quick calculations

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

**In-app purchases:** none


## Frequently asked questions

### Is Stair Calculator free?

Stair Calculator is free to download, with in-app purchases available.

### Is Arch Radius free?

Arch Radius costs $0.99, with no in-app purchases.

### Which has better reviews, Stair Calculator or Arch Radius?

Stair Calculator is rated higher. Stair Calculator averages 4.1 out of 5 from 740 ratings, while Arch Radius averages 1.0 from 1 ratings.

### Do Stair Calculator or Arch Radius have ads?

Neither Stair Calculator nor Arch Radius shows ads.

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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.*