# Construction Calc Pro 2 vs Drain Slope Pro

The clearest difference is price: Drain Slope Pro at Free against Construction Calc Pro 2's $13.99. Drain Slope Pro also leads on iOS requirement (15.1 vs 26.0). Construction Calc Pro 2's advantage is in-app purchases (none vs 1) and chart position (#197 vs unranked). On update cadence, ads and device support there is nothing between them.

Drain Slope Pro is free to download; Construction Calc Pro 2 costs $13.99 up front. Drain Slope Pro sells 1 one-off in-app purchase. Construction Calc Pro 2 asks for nothing beyond the download.

Construction Calc Pro 2 ships an update every 4 months, Drain Slope Pro every 3 months. The most recent releases landed on October 25, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Construction Calc Pro 2 | Drain Slope Pro |
| --- | --- | --- |
| Price | $13.99 | **Free** |
| Rating | **[4.7 (9 ratings)](https://appshunter.io/ios/app/construction-calc-pro-2/id6446281301/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Paid | — |
| Best chart rank | **#197** | — |
| Size | 85 MB | 39 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Snappy Appz Inc.](https://appshunter.io/developer/375591377) | [BRUCE RAY MCCAMPBELL](https://appshunter.io/developer/6772438648) |

## What reviewers say

### Construction Calc Pro 2

[App page](https://appshunter.io/ios/app/construction-calc-pro-2/id6446281301)

**Currently charting:** #197 Top Paid · Utilities (US App Store)

This powerful calculator app is designed specifically for construction professionals, enabling calculations in feet, inches, and fractional inches. It offers specialized modules for material estimates, conversions, area and volume calculations, trigonometry, and stair design, transforming your device into a comprehensive construction computer.

**Highlights:** Calculations in feet, inches, and fractional inches, Material estimation modules, Conversions for various measurements, Area and volume calculations, Trigonometry and triangle solver, Stairwell and stair calculator, Crown moulding module

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

**In-app purchases:** none


### Drain Slope Pro

[App page](https://appshunter.io/ios/app/drain-slope-pro-plumber/id6772439957)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock | $1.99 | one-time |


## Frequently asked questions

### Is Construction Calc Pro 2 free?

Construction Calc Pro 2 costs $13.99, with no in-app purchases.

### Is Drain Slope Pro free?

Drain Slope Pro is free to download, with in-app purchases available.

### Do Construction Calc Pro 2 or Drain Slope Pro have ads?

Neither Construction Calc Pro 2 nor Drain Slope Pro shows ads.

### Which is updated more often, Construction Calc Pro 2 or Drain Slope Pro?

Construction Calc Pro 2 ships an update every 4 months, and Drain Slope Pro every 3 months. Most recently, Construction Calc Pro 2 was updated on October 25, 2026 and Drain Slope Pro on October 6, 2026.

---

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