# IsoDecibel vs amscan

The clearest difference is rating: IsoDecibel at 5.0 against amscan's 4.0. IsoDecibel also leads on in-app purchases (none vs 2) and iOS requirement (13.0 vs 18.6). amscan's advantage is update cadence (every 11 days vs every 9 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. amscan sells 2 one-off in-app purchases. IsoDecibel asks for nothing beyond the download.

IsoDecibel holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

IsoDecibel ships an update every 9 months, amscan every 11 days. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | IsoDecibel | amscan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/isodecibel/id1670738247/reviews)** | [4.0 (2 ratings)](https://appshunter.io/ios/app/amscan/id6749589715/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 11 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 10 MB | 20 MB |
| Requires iOS | **13.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Emil Aerenlund](https://appshunter.io/developer/1645551094) | [Dariush Majidi](https://appshunter.io/developer/1740614809) |

## 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


### amscan

[App page](https://appshunter.io/ios/app/amscan/id6749589715)

Visualize room modes in 3D using LiDAR scanning. Capture room geometry to instantly calculate acoustic modes, aiding in sound design and optimization for audiophiles and professionals. Offers free basic calculations with an in-app purchase for advanced modes.

**Highlights:** LiDAR room scanning, 3D room mode visualization, Automatic 3D model creation, Augmented Reality mode visualization, Basic acoustic data (RT60, Schroeder Freq, Volume), Unlimited room scanning

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Simulation Geometry | $3.99 | one-time |
| Additional Room Modes | $6.99 | one-time |


## Frequently asked questions

### Is IsoDecibel free?

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

### Is amscan free?

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

### Which has better reviews, IsoDecibel or amscan?

IsoDecibel is rated higher. IsoDecibel averages 5.0 out of 5 from 1 ratings, while amscan averages 4.0 from 2 ratings.

### Do IsoDecibel or amscan have ads?

Neither IsoDecibel nor amscan shows ads.

### Which is updated more often, IsoDecibel or amscan?

IsoDecibel ships an update every 9 months, and amscan every 11 days. Most recently, IsoDecibel was updated on October 7, 2026 and amscan on October 9, 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.*