# Stair Calculator vs Carpentry Calculator

The clearest difference is review sentiment: Carpentry Calculator at 71% against Stair Calculator's 21%. Carpentry Calculator also leads on rating (5.0 vs 4.1) and monetization model (free vs free with in-app purchases). Stair Calculator's advantage is ratings volume (740 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Stair Calculator sells 2 in-app purchases, starting at $9.99 per year and Carpentry Calculator sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Carpentry Calculator holds the better App Store score, 5.0 against 4.1. 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 71% of Carpentry Calculator's.

Stair Calculator ships an update every 3 months, Carpentry Calculator every 2 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Stair Calculator | Carpentry Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (740 ratings)](https://appshunter.io/ios/app/stair-calculator-construction/id1493037366/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/carpentry-calculator/id1586739365/reviews)** |
| Number of ratings | **740** | 1 |
| Positive reviews | 21.4% of reviews | **71.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 1 MB | 23 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Phan Nhat Đang](https://appshunter.io/developer/1437390098) | [Matthew Spencer](https://appshunter.io/developer/1642000494) |

## 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


### Carpentry Calculator

[App page](https://appshunter.io/ios/app/carpentry-calculator/id1586739365)

This app simplifies complex calculations for carpenters, builders, and DIY enthusiasts. It handles tasks like roofing, stairs, and decking, offering both metric and imperial units. Visual aids and detailed measurements enhance accuracy and efficiency on any project.

**Highlights:** Roofing calculations, Stair and decking measurements, Concrete slab and post hole calculations, Raked wall and balustrade design, Trigonometry functions, Metric and imperial unit support, Light and dark mode options

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Discounted upgrade | $3.49 | one-time |
| Upgrade to paid version | $4.99 | one-time |


## Frequently asked questions

### Is Stair Calculator free?

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

### Is Carpentry Calculator free?

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

### Which has better reviews, Stair Calculator or Carpentry Calculator?

Carpentry Calculator is rated higher. Stair Calculator averages 4.1 out of 5 from 740 ratings, while Carpentry Calculator averages 5.0 from 1 ratings.

### Do Stair Calculator or Carpentry Calculator have ads?

Neither Stair Calculator nor Carpentry Calculator shows ads.

### Which is updated more often, Stair Calculator or Carpentry Calculator?

Stair Calculator ships an update every 3 months, and Carpentry Calculator every 2 months. Most recently, Stair Calculator was updated on November 3, 2026 and Carpentry Calculator on November 3, 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.*