# Flat Pattern Pro vs RedX Stairs

The clearest difference is price: RedX Stairs at Free against Flat Pattern Pro's $9.99. RedX Stairs also leads on update cadence (every 2 weeks vs every 42 months) and review sentiment (26% vs 0%). Flat Pattern Pro's advantage is in-app purchases (none vs 8). On ads, device support and iOS requirement there is nothing between them.

RedX Stairs is free to download; Flat Pattern Pro costs $9.99 up front. RedX Stairs sells 7 in-app purchases, starting at $6.99 per month. Flat Pattern Pro asks for nothing beyond the download.

Flat Pattern Pro ships an update every 42 months, RedX Stairs every 2 weeks. Both last shipped on October 25, 2026.

## The numbers

| Metric | Flat Pattern Pro | RedX Stairs |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[4.5 (422 ratings)](https://appshunter.io/ios/app/redx-stairs-3d-calculator/id1589688170/reviews)** |
| Number of ratings | — | **422** |
| Positive reviews | 0.0% of reviews | **25.9% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 42 months | **Every 2 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 2 MB | 174 MB |
| Requires iOS | 16.1 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Imran Pinjara](https://appshunter.io/developer/1484488781) | [RedX Technology Inc](https://appshunter.io/developer/835492291) |

## What reviewers say

### Flat Pattern Pro

[App page](https://appshunter.io/ios/app/flat-pattern-pro/id1489799915)

This app provides a comprehensive tool for calculating and developing fabrication layouts for a wide range of shapes. It helps minimize fabrication time and increase accuracy by offering user-friendly tools for complex designs.

**Highlights:** Fabrication layout development, Supports numerous shapes (pipes, cones, pyramids, spheres), Minimizes fabrication time, Increases accuracy, Offline functionality, Ad-free experience

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

**In-app purchases:** none


### RedX Stairs

[App page](https://appshunter.io/ios/app/redx-stairs-3d-calculator/id1589688170)

This app simplifies complex stair calculations and designs with advanced 3D visualization. It offers a comprehensive suite of calculators for various stair types, supporting multiple measurement units and providing detailed, to-scale plans for professionals and DIYers.

**Highlights:** 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

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

**In-app purchases (7)**

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

**What reviewers like**

- 👍 Great for pros and new users
- 💡 Detailed project PDFs
- 💡 Excellent for riser stairs
- 💡 Handles complex stair designs
- 💡 Useful for limited space

**What reviewers complain about**

- 👎 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

**Reported bugs**

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

**Requested features**

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


## Frequently asked questions

### Is Flat Pattern Pro free?

Flat Pattern Pro costs $9.99, with no in-app purchases.

### Is RedX Stairs free?

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

### Do Flat Pattern Pro or RedX Stairs have ads?

Neither Flat Pattern Pro nor RedX Stairs shows ads.

### Which is updated more often, Flat Pattern Pro or RedX Stairs?

Flat Pattern Pro ships an update every 42 months, and RedX Stairs every 2 weeks. Most recently, Flat Pattern Pro was updated on October 25, 2026 and RedX Stairs 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.*