# Stair Calculator vs RedX Decks

The clearest difference is update cadence: RedX Decks at every 10 days against Stair Calculator's every 3 months. RedX Decks also leads on rating (4.3 vs 4.1) and review sentiment (31% vs 21%). On price, ratings volume, 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 RedX Decks sells 9 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

RedX Decks holds the better App Store score, 4.3 against 4.1. Both are backed by a comparable volume of ratings — 738 and 521 respectively. Written reviews point the same way: 21% of Stair Calculator's written reviews are positive against 31% of RedX Decks's.

Stair Calculator ships an update every 3 months, RedX Decks every 10 days. The most recent releases landed on September 18, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Stair Calculator | RedX Decks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (738 ratings)](https://appshunter.io/ios/app/stair-calculator-construction/id1493037366/reviews) | **[4.3 (521 ratings)](https://appshunter.io/ios/app/redx-decks-3d-deck-builder/id6474487367/reviews)** |
| Number of ratings | **738** | 521 |
| Positive reviews | 21.4% of reviews | **30.8% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 10 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 1 MB | 177 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Phan Nhat Đang](https://appshunter.io/developer/1437390098) | [RedX Technology Inc](https://appshunter.io/developer/835492291) |

## 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


### RedX Decks

[App page](https://appshunter.io/ios/app/redx-decks-3d-deck-builder/id6474487367)

Design and visualize complex deck structures, including roofs and stairs, with automatic framing and structural calculations. Generate professional, permit-ready blueprints and detailed material lists for efficient construction.

**Highlights:** 3D deck and roof design, Automatic framing layouts, Structural calculations, Permit-ready blueprints, Material and cut lists, 3D visualization and renders

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RedX Decks Pro | $6.99 | per month |
| RedX Apps Pro++ Monthly | $9.99 | per month |
| RedX Apps Pro++ | $59.99 | per year |
| RedX Decks Pro | $59.99 | per year |
| RedX Decks Pro | $69.99 | per year |
| RedX Apps Bundle | $179.99 | per year |
| 20 Render Credits | $9.99 | one-time |
| 100 Render Credits | $29.99 | one-time |
| 200 Render Credits | $44.99 | one-time |


## Frequently asked questions

### Is Stair Calculator free?

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

### Is RedX Decks free?

RedX Decks is free to download, with in-app purchases available.

### Which has better reviews, Stair Calculator or RedX Decks?

RedX Decks is rated higher. Stair Calculator averages 4.1 out of 5 from 738 ratings, while RedX Decks averages 4.3 from 521 ratings.

### Do Stair Calculator or RedX Decks have ads?

Neither Stair Calculator nor RedX Decks shows ads.

### Which is updated more often, Stair Calculator or RedX Decks?

Stair Calculator ships an update every 3 months, and RedX Decks every 10 days. Most recently, Stair Calculator was updated on September 18, 2026 and RedX Decks on September 21, 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.*