# IsoDecibel vs Construction Calc

The clearest difference is in-app purchases: IsoDecibel at none against Construction Calc's 1. IsoDecibel also leads on iOS requirement (13.0 vs 15.6). Construction Calc's advantage is update cadence (every 3 months vs every 9 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Construction Calc sells 1 one-off in-app purchase. IsoDecibel asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for IsoDecibel against 5.0 for Construction Calc. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

IsoDecibel ships an update every 9 months, Construction Calc every 3 months. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | IsoDecibel | Construction Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/isodecibel/id1670738247/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/construction-calc-estimator/id6755724882/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 10 MB | 3 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Emil Aerenlund](https://appshunter.io/developer/1645551094) | [Konstantin Khoroshun](https://appshunter.io/developer/1476700024) |

## What reviewers say

### IsoDecibel

[App page](https://appshunter.io/ios/app/isodecibel/id1670738247)

This tool simplifies decibel calculations, allowing you to add, subtract, and average sound source levels. It's designed for ease of use and to provide an educational insight into acoustics.

**Highlights:** Add independent source levels, Subtract independent source levels, Calculate average of source levels, Sum up to 20 source levels, Educational insight into acoustics

**Features:** Vision Pro support

**In-app purchases:** none


### Construction Calc

[App page](https://appshunter.io/ios/app/construction-calc-estimator/id6755724882)

This offline calculator helps construction professionals and DIYers quickly estimate materials for various projects. It supports imperial and metric units, and all calculations are stored locally for privacy.  No internet connection is required.

**Highlights:** Offline material estimation, Calculates 8 key materials, Feet-Inch-Fraction input, Imperial & Metric units, Local data storage, No subscriptions or ads

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Features | $0.99 | one-time |


## Frequently asked questions

### Is IsoDecibel free?

IsoDecibel is free to download, with no in-app purchases.

### Is Construction Calc free?

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

### Which has better reviews, IsoDecibel or Construction Calc?

IsoDecibel and Construction Calc are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do IsoDecibel or Construction Calc have ads?

Neither IsoDecibel nor Construction Calc shows ads.

### Which is updated more often, IsoDecibel or Construction Calc?

IsoDecibel ships an update every 9 months, and Construction Calc every 3 months. Most recently, IsoDecibel was updated on November 3, 2026 and Construction Calc on November 5, 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.*