# Building Acoustics Partner vs IsoCal

The clearest difference is price: Building Acoustics Partner at Free against IsoCal's $14.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

Building Acoustics Partner is free to download; IsoCal costs $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Building Acoustics Partner ships an update every 4 months, IsoCal every 2 months. The most recent releases landed on October 10, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Building Acoustics Partner | IsoCal |
| --- | --- | --- |
| Price | **Free** | $14.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/isocal/id1645551092/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | — | Paid |
| Size | 160 MB | 45 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hottinger Bruel & Kjaer A/S](https://appshunter.io/developer/622515894) | [Emil Aerenlund](https://appshunter.io/developer/1645551094) |

## What reviewers say

### Building Acoustics Partner

[App page](https://appshunter.io/ios/app/building-acoustics-partner/id1487977751)

**Features:** macOS Compatibility

**In-app purchases:** none


### IsoCal

[App page](https://appshunter.io/ios/app/isocal/id1645551092)

This tool helps calculate the sound reduction index for various wall constructions, including single, double, and multi-leaf walls. It offers a catalog of materials and allows users to add their own for designing optimal soundproofing. The app also includes a calculator for predicting absorption coefficients of porous materials.

**Highlights:** Sound reduction index calculation, Single, double, and multi-leaf wall design, Material catalog and custom material input, Porous material absorption coefficient calculator, Cavity and boundary connection design

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

**In-app purchases:** none


## Frequently asked questions

### Is Building Acoustics Partner free?

Building Acoustics Partner is free to download, with no in-app purchases.

### Is IsoCal free?

IsoCal costs $14.99, with no in-app purchases.

### Do Building Acoustics Partner or IsoCal have ads?

Neither Building Acoustics Partner nor IsoCal shows ads.

### Which is updated more often, Building Acoustics Partner or IsoCal?

Building Acoustics Partner ships an update every 4 months, and IsoCal every 2 months. Most recently, Building Acoustics Partner was updated on October 10, 2026 and IsoCal on October 7, 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.*