# Construction Master Pro Calc vs Stair Stringer

The clearest difference is price: Construction Master Pro Calc at Free against Stair Stringer's $1.99. Construction Master Pro Calc also leads on ratings volume (40K vs 86). Stair Stringer's advantage is in-app purchases (none vs 20). On rating, review sentiment, update cadence and ads there is nothing between them.

Construction Master Pro Calc is free to download; Stair Stringer costs $1.99 up front. Construction Master Pro Calc sells 12 in-app purchases, starting at $3.69 per month. Stair Stringer asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for Construction Master Pro Calc against 4.7 for Stair Stringer. That said, the two scores are not equally well evidenced: Construction Master Pro Calc has 40K ratings behind it against 86, so its average is the more settled of the two. Written reviews are what separate them: 60% of Construction Master Pro Calc's written reviews are positive against 67% of Stair Stringer's.

Construction Master Pro Calc ships an update every 3 weeks, Stair Stringer every 5 weeks. The most recent releases landed on September 26, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Construction Master Pro Calc | Stair Stringer |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.8 (40K ratings)](https://appshunter.io/ios/app/construction-master-pro-calc/id370406446/reviews)** | [4.7 (86 ratings)](https://appshunter.io/ios/app/stair-stringer/id1550828339/reviews) |
| Number of ratings | **40K** | 86 |
| Positive reviews | 60.1% of reviews | **66.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | **#45** | #126 |
| Size | 111 MB | 2 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Calculated Industries](https://appshunter.io/developer/370406449) | [H3 Apps, LLC](https://appshunter.io/developer/598620927) |

## What reviewers say

### Construction Master Pro Calc

[App page](https://appshunter.io/ios/app/construction-master-pro-calc/id370406446)

**Currently charting:** #45 Top Grossing · Utilities (US App Store)

This app is a powerful construction calculator designed for professionals working with dimensions. It offers a wide range of solutions for dimensional math, right angle calculations, area and volume, and special functions, helping to improve speed and accuracy in layouts, bids, and estimates.

**Highlights:** Dimensional math and conversions, Right angle and rafter calculations, Area and volume solutions, Full trigonometric functions, Built-in user's guide and help, Save and share calculations, Project notes and attachments

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

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Full Access | $3.69 | per month |
| 1 Month Full Access | $4.99 | per month |
| 1 Month Full Access | $4.99 | per month |
| 1 Month Full Access | $4.99 | per month |
| CMPro Full Access | $9.99 | per year |
| 6 Months Full Access | $19.99 | per 6 months |
| 1 Year Full Access | $19.99 | per year |
| 1 Year Full Access | $29.99 | per year |
| 1 Year Full Access | $39.99 | per year |
| 1 Year Full Access | $39.99 | per year |
| 1 Year Full Access | $39.99 | per year |
| 1 Year Full Access | $39.99 | per year |

**What reviewers like**

- 🚀 Convenient and always available
- ⚙️ Comprehensive construction calculations
- 💪 Industry-standard tool
- 🔍 Accurate and reliable
- 📱 Integrates well with mobile devices

**What reviewers complain about**

- 💰 Subscription model too expensive
- 🔒 Locks data behind subscription
- 🔄 Forced to re-purchase after device changes
- 🔍 Lacks full metric support
- 🔧 Occasional UI/UX issues

**Reported bugs**

- Crashes or freezes on certain devices
- Calculation errors in some scenarios
- Inconsistent behavior after updates

**Requested features**

- Add metric unit support
- Offer one-time purchase option
- Improve backup and data transfer
- Add more customization options
- Enhance overall user experience


### Stair Stringer

[App page](https://appshunter.io/ios/app/stair-stringer/id1550828339)

**Currently charting:** #126 Top Paid · Utilities (US App Store)

This app calculates all necessary measurements for building a stair stringer, including risers, run, angle, and length. Easily adjust parameters and switch between Imperial and Metric units. Share your calculated results via email or text.

**Highlights:** Calculates stair risers and run, Determines stair angle and stringer length, Calculates step height and tread depth, Determines the number of steps, Adjustable parameters, Imperial or Metric units, Share results via email/text

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

**In-app purchases:** none


## Frequently asked questions

### Is Construction Master Pro Calc free?

Construction Master Pro Calc is free to download, with in-app purchases available.

### Is Stair Stringer free?

Stair Stringer costs $1.99, with no in-app purchases.

### Which has better reviews, Construction Master Pro Calc or Stair Stringer?

Construction Master Pro Calc is rated higher. Construction Master Pro Calc averages 4.8 out of 5 from 40K ratings, while Stair Stringer averages 4.7 from 86 ratings.

### Do Construction Master Pro Calc or Stair Stringer have ads?

Neither Construction Master Pro Calc nor Stair Stringer shows ads.

### Which is updated more often, Construction Master Pro Calc or Stair Stringer?

Construction Master Pro Calc ships an update every 3 weeks, and Stair Stringer every 5 weeks. Most recently, Construction Master Pro Calc was updated on September 26, 2026 and Stair Stringer on September 23, 2026.

### Which is more popular, Construction Master Pro Calc or Stair Stringer?

Construction Master Pro Calc currently peaks at #45 in the App Store charts, and Stair Stringer at #126. Chart position reflects recent download velocity rather than total install base.

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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.*