# Construction Master Pro Calc vs Napoleon/Lynx Spring Calc

The clearest difference is in-app purchases: Napoleon/Lynx Spring Calc at none against Construction Master Pro Calc's 20. Construction Master Pro Calc's advantage is update cadence (every 3 weeks vs every 7 months) and ratings volume (40K vs 1). On price, rating, ads and device support there is nothing between them.

Both are free to download. Construction Master Pro Calc sells 12 in-app purchases, starting at $3.69 per month. Napoleon/Lynx Spring Calc asks for nothing beyond the download.

Napoleon/Lynx Spring Calc holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Construction Master Pro Calc has 40K ratings behind it against 1, so its average is the more settled of the two.

Construction Master Pro Calc ships an update every 3 weeks, Napoleon/Lynx Spring Calc every 7 months. The most recent releases landed on October 31, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Construction Master Pro Calc | Napoleon/Lynx Spring Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (40K ratings)](https://appshunter.io/ios/app/construction-master-pro-calc/id370406446/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/napoleonlynx-spring-calc/id6737538790/reviews)** |
| Number of ratings | **40K** | 1 |
| Positive reviews | 60.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 7 months |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#51** | — |
| Size | 111 MB | 23 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Calculated Industries](https://appshunter.io/developer/370406449) | [Napoleon Spring Works](https://appshunter.io/developer/1771529934) |

## What reviewers say

### Construction Master Pro Calc

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

**Currently charting:** #51 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


### Napoleon/Lynx Spring Calc

[App page](https://appshunter.io/ios/app/napoleonlynx-spring-calc/id6737538790)

This utility app simplifies garage door torsion spring calculations for single and duplex assemblies. It supports various lift types and drums, allowing users to save and share their calculations. Connect with local sales representatives for parts and assistance.

**Highlights:** Calculates torsion springs for single/duplex assemblies, Supports various lift types and drums, Save calculations locally, Share calculations with other apps, Direct contact for sales representatives

**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 Napoleon/Lynx Spring Calc free?

Napoleon/Lynx Spring Calc is free to download, with no in-app purchases.

### Which has better reviews, Construction Master Pro Calc or Napoleon/Lynx Spring Calc?

Napoleon/Lynx Spring Calc is rated higher. Construction Master Pro Calc averages 4.8 out of 5 from 40K ratings, while Napoleon/Lynx Spring Calc averages 5.0 from 1 ratings.

### Do Construction Master Pro Calc or Napoleon/Lynx Spring Calc have ads?

Neither Construction Master Pro Calc nor Napoleon/Lynx Spring Calc shows ads.

### Which is updated more often, Construction Master Pro Calc or Napoleon/Lynx Spring Calc?

Construction Master Pro Calc ships an update every 3 weeks, and Napoleon/Lynx Spring Calc every 7 months. Most recently, Construction Master Pro Calc was updated on October 31, 2026 and Napoleon/Lynx Spring Calc on October 17, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*