# RedX Stairs - 3D Calculator — Design & Calculate Stairs

> 3D stair design and calculation tool with comprehensive calculators and visualization. (iPhone/iPad app by RedX Technology Inc.)

- Source: https://appshunter.io/ios/app/redx-stairs-3d-calculator/id1589688170 (this page in markdown: same URL + `.md`)
- Developer: [RedX Technology Inc](https://appshunter.io/developer/835492291)
- Category: Utilities, Business
- Price: Free with in-app purchases
- Rating: 4.50/5 from 407 App Store ratings · 27 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 174 MB
- Languages: American English
- Released: 2021-10-24
- Data updated: 2026-08-31
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/redx-stairs-3d-calculator/id1589688170/reviews.md

## What is RedX Stairs?

Discover the next level of stair construction with the RedX Stair App, now fully enhanced with stunning 3D capabilities. This app is your essential companion for efficient and precise stair measurement and visualization. Featuring a wide selection of calculators for every type of stair configuration including Straight Stairs , L-Shaped Stairs, U-Shaped Stairs, Spiral Stairs, Winder Stairs, Corner Deck Stairs and more, it effortlessly simplifies the most complex stair calculations. Whether you're working in CM, MM, Feet, or Inches, this app ensures versatile and accurate measurements for professionals and DIY enthusiasts alike.

Key Upgrades and Features:

Advanced 3D visualization for all stair types, offering a dynamic and immersive design experience
Comprehensive suite of calculators for Straight, L, U, Spiral Stairs, Winders, and more, accommodating any project requirement
Interactive, to-scale stair plans with precise measurements, enhancing design accuracy and efficiency
Multifaceted measurement support in CM, MM, Feet, and Inches for global applicability
Efficient project management options: Print, Share, Save to Photos, or Store designs in-app for future reference
Detailed plans and measurements for common stair builds, including stringer details for unparalleled clarity
Specialized tools for designing Spiral, Curved, and Winder stairs with customizable specifications
Exclusive Features for Enhanced Design:

Enter key details like Total Rise, Stringer, and Tread information to instantly generate detailed, to-scale stair plans
Customize your stair designs with adjustable Stair Angles, Step Numbers, and more for perfect fit and function
For Spiral and Curved Stairs, specify Total Rise, Rotation, and Radius to receive plans with Inner and Outer Stringer measurements
Unique Winder Stairs feature for detailed planning of each tread, ensuring precise execution of complex designs
Specialized calculators for Hip Stringers and Stairs with Landings, offering comprehensive design solutions
The RedX Stair App is the ultimate tool for transforming your stair design process with the power of 3D visualization. Download now to experience unparalleled precision and creativity in stair design. Stay ahead with continuous updates and new features, elevating your design capabilities to new heights.

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Terms Of Use
https://www.redxapps.com/terms-of-service

In-app purchases available for premium features. Subscription options include a monthly or yearly Stairs App Pro Subscription, with payment charged to your iTunes account and easy management of auto-renewal settings in the App Store. Pricing details and subscription terms available within the app.

## Key features

- Advanced 3D stair visualization
- Comprehensive stair calculators
- To-scale stair plans with precise measurements
- Support for CM, MM, Feet, and Inches
- Project saving and sharing options
- Specialized tools for spiral and winder stairs

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| RedX Stairs Monthly | $6.99 | per month |
| RedX Stairs Premium | $59.99 | per year |
| RedX Apps Bundle | $99.99 | per year |
| RedX Apps Bundle | $179.99 | per year |
| RedX Apps Bundle | $179.99 | per year |
| RedX Apps Pro++ | $59.99 | per year |
| RedX Stairs Pro | $69.99 | per year |
| RedX Apps Pro++ | $9.99 | per month |


## What do users think of RedX Stairs?

Overall sentiment: negative

**Pros**

- 👍 Great for pros and new users
- 💡 Detailed project PDFs
- 💡 Excellent for riser stairs
- 💡 Handles complex stair designs
- 💡 Useful for limited space
- 💡 Easy to print designs
- 💡 Clear cut lists and layouts

**Cons**

- 👎 App gets stuck on opening screen
- 👎 Scam to charge $60
- 👎 Subscription expired, can't view/edit
- 👎 Expensive and missing options
- 👎 Paid for a year, lost work after canceling
- 👎 Does not do spiral staircases
- 👎 Can't use features without subscription
- 👎 Repeatedly redirects to subscription page
- 👎 Difficult to cancel
- 👎 Unaccessible without paying
- 👎 Charged immediately for trial
- 👎 Paid version has nothing
- 👎 Subscription waste of money
- 👎 Can't calculate small rises
- 👎 Money pit, £80/year
- 👎 Doesn't disclose monthly cost
- 👎 Over $40 per month
- 👎 Can't do anything without subscription
- 👎 All features cost subscription
- 👎 Useless without subscription
- 👎 Similar tools available for free
- 👎 New features slow and confusing
- 👎 3D model too detailed for field

**Commonly reported bugs**

- App gets stuck on opening screen
- App repeatedly redirects to subscription page
- Lost work after canceling subscription

**Most requested features**

- Support for spiral staircases
- Include stairs app in bundle
- More features in paid version

## Recent user reviews (10 of 27)

All indexed reviews: https://appshunter.io/ios/app/redx-stairs-3d-calculator/id1589688170/reviews.md

### 1/5 — Way off code

*2026-07-30*

Wasn’t even close to code. If I made these the way it drew them somebody would have gotten injured let alone it would never pass inspection.

### 1/5 — Good app, bad subscription

*2026-07-13*

App works well. The problem I have is , I signed up for the free trial and when you sign up it says that the app will prompt you before your trial runs out. Never prompted me that my trial was about to run out  and charged me $59 for a year subscription that I won’t use.

### 1/5 — The old app worked better

*2026-06-15*

Why are you attempting to add all of these new features for mobile? Did it occur to you that workers don’t always need to see this extra detail provided in the 3D model. It’s slower to load in the field and confusing for most users.

### 1/5 — App does not work

*2026-02-28*

It gets stuck on the opening screen

### 4/5 — Расчет лестницы.

*2025-05-07*

Очень удобное приложение. Поставил бы с радостью оценку 5. Если косоур проектировал бы из метала, ломанный косоур, на одном косоуре.

### 1/5 — Scam to charge you 60.00

*2025-05-02*

Do not download it gets your Apple ID and if you don’t cancel it in 7 days charges you 60.00 SCAMMERS.

### 5/5 — Ref x

*2025-04-26*

Great app for new or pros this app shows you a clear detail pdf of your project in full detail on what you are building! GJG Inc

### 1/5 — Horrible 🤮

*2025-04-24*

At first, when I was paying for my subscription it was amazing, however 2 weeks after my subscription expired, I can’t view, edit, make a pdf, print, or share my projects, I don’t recommend it because it’s expensive and is missing many things/options for stairs

### 1/5 — Paid for a year lost work

*2025-02-26*

I paid for a year then canceled the subscription and it did not keep any of the work even though it had been 1 week. I just didn’t want to have it subscribed knowing I wouldn’t need it more than a month or two.

### 1/5 — Not complete

*2025-02-15*

Does not do spiral staircases

## Frequently asked questions about RedX Stairs

### What does the RedX Stairs app do?

The RedX Stairs app is a powerful tool for designing and calculating stairs. It offers advanced 3D visualization and a comprehensive suite of calculators for various stair configurations, simplifying complex measurements and design processes for both professionals and DIY enthusiasts.

### What are the key features of this stair calculator app?

Key features include advanced 3D visualization for all stair types, a wide range of calculators for straight, L-shaped, U-shaped, spiral, and winder stairs, interactive to-scale plans with precise measurements, and support for multiple measurement units (CM, MM, Feet, Inches). It also offers project management options like saving, printing, and sharing designs.

### How is the app monetized and what are the costs?

The app offers in-app purchases for premium features and has subscription options available, including monthly or yearly plans. Payment is processed through your iTunes account, and pricing details for subscriptions can be found within the app. There are also free features available.

### What types of stair designs can I create with this app?

You can design a wide variety of stair types, including Straight Stairs, L-Shaped Stairs, U-Shaped Stairs, Spiral Stairs, Winder Stairs, and Corner Deck Stairs. The app provides specialized tools for complex designs like Spiral, Curved, and Winder stairs, as well as Hip Stringers and Stairs with Landings.

### Is this app compatible with different measurement units?

Yes, the app is designed for global applicability and supports multiple measurement units. You can perform calculations and design stairs using centimeters (CM), millimeters (MM), feet, and inches, ensuring accuracy regardless of your preferred system.

## Version history (last 5 releases)

### 3.1.9 — 2026-08-01

Minor improvements and bug fixes

### 3.1.7 — 2026-06-22

New features to the stair builder and improved AI

### 3.1.6 — 2026-06-17

This update has bug fixes and improvements to the stair builder.

### 3.1.5 — 2026-06-14

This update adds a new stair builder!

### 3.1.4 — 2025-10-27

This update adds a new dashboard, and minor bug fixes.

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## More apps by RedX Technology Inc

- [Welland Canal Bridge Status](https://appshunter.io/ios/app/welland-canal-bridge-status/id1513050020)
- [RedX Roof - Rafter Calculator](https://appshunter.io/ios/app/redx-roof-rafter-calculator/id1519896740)
- [Triton - Dive Tracker](https://appshunter.io/ios/app/triton-dive-tracker/id1533556089)
- [RedX Walls - Design & Build](https://appshunter.io/ios/app/redx-walls-design-and-build/id1554953550)
- [Welland Canal - Bridge Status](https://appshunter.io/ios/app/welland-canal-bridge-status/id1572213857)

All apps by RedX Technology Inc: https://appshunter.io/developer/835492291

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*