# IsoCal — Calculate the sound reduction

> Calculates sound reduction index for walls and absorption coefficients for porous materials. (iPhone/iPad app by Emil Aerenlund.)

- Source: https://appshunter.io/ios/app/isocal/id1645551092 (this page in markdown: same URL + `.md`)
- Developer: [Emil Aerenlund](https://appshunter.io/developer/1645551094)
- Category: Utilities, Developer Tools
- Price: $14.99
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 15.1 · 45 MB
- Languages: American English
- Released: 2023-01-11
- Data updated: 2026-08-05
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/isocal/id1645551092/reviews.md

## What is IsoCal?

IsoCal is a prediction tool for calculating the sound reduction index of single walls with no cavity and double walls with a cavity between the leafs. It is possible to design walls with multiple leafs and different cavity/boundary connections (rigid connections, steel studs, staggered studs, etc.), different porous sound absorption material in the cavity of a double wall and predict the sound reduction index given as a Rw value in decibels [dB]. IsoCal comes built in with a catalog of well known material and porous material to use for designing the wall for optimal sound reduction. The user can also insert own materials in order to expand own personal database.
IsoCal also provides a calculator for the prediction of absorption coefficients of porous materials. A simple calculator that lets the user choose the porous material thickness, air gap behind the porous material and more.

## Key features

- 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


## Frequently asked questions about IsoCal

### What is IsoCal used for?

IsoCal is a prediction tool designed to calculate the sound reduction index (Rw) of various wall constructions. It helps users design walls for optimal sound reduction by analyzing different materials and configurations.

### What types of walls can IsoCal analyze?

IsoCal can analyze single walls with no cavity, double walls with a cavity, and even walls with multiple leafs. It supports various cavity and boundary connections, such as rigid connections and steel studs.

### Can I add my own materials to IsoCal?

Yes, IsoCal allows users to insert their own materials to expand their personal database. This feature enables more customized wall designs for specific sound reduction needs.

### Does IsoCal have ads?

No, IsoCal does not contain advertisements. It is a paid application that provides an ad-free experience for its users.

### What is the price of IsoCal?

IsoCal is available for a one-time purchase price of $14.99. This grants you full access to all its features for calculating sound reduction and absorption coefficients.

### On which devices can I use IsoCal?

IsoCal is compatible with iPhone, iPad, and iPod devices. It is designed to run on Apple's iOS operating system.

### How often is IsoCal updated?

The latest version of IsoCal is 1.5.6, last updated on May 31, 2026. While this indicates a recent update, users can expect ongoing support and potential future enhancements.

### What is the age rating for IsoCal?

IsoCal has an age rating of 4+. This indicates it is suitable for users of all ages and does not contain content inappropriate for children.

## Version history (last 5 releases)

### 1.5.6 — 2026-05-31

- Added a "+" button for adding a new user defined material, and a "-" button for deleting a user defined material. The buttons can be found underneath the material-scroll list.

### 1.5.4 — 2026-01-25

Fixes:
- Fixed an issue where critical frequencies [fc] below 50 Hz and above 5000 Hz in some cases would result in a crash
Changes:
- Technical updates in order to future proof code

### 1.5.1 — 2025-09-02

- Added a button to Copy data in the 'Absorption' calculation module. The Copy data button is located underneath the Single Number Rating

### 1.5.0 — 2025-04-24

Changes:
- Made the autoscaling more robust for tablet devices when rotating the view
- Added a 'Split' button under the absorption width textinput. This will split the absorption material in two in the 'Double Wall' calculation module and will only affect the visuals for 2D and 3D Material Viewer

### 1.4.9 — 2025-03-06

New Content:
- Added "Lightweight Concrete" to the material list
Changes:
- Set up auto-scaling for the viewer in the "Absorption" calculation module. The chosen material will no longer go out of screen boundaries.
- Added text and size in mm in the viewer for the absorption material in  the "Absorption" calculation module.

## Apps similar to IsoCal

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [amscan](https://appshunter.io/ios/app/amscan/id6749589715) | 3.0 (1) | Free | Utilities |
| [Building Acoustics Partner](https://appshunter.io/ios/app/building-acoustics-partner/id1487977751) | — | Free | Utilities |
| [NSP32 nanoLambda Spectrometer](https://appshunter.io/ios/app/nsp32-nanolambda-spectrometer/id1480194984) | — | Free | Utilities |
| [FlexiFone](https://appshunter.io/ios/app/flexifone/id6480311434) | — | Free | Utilities |
| [VQ AcousticCheck](https://appshunter.io/ios/app/vq-acousticcheck/id6737261712) | — | Free | Utilities |
| [Currently One](https://appshunter.io/ios/app/currently-one/id6444130357) | — | Free | Utilities |

## More apps by Emil Aerenlund

- [IsoDecibel](https://appshunter.io/ios/app/isodecibel/id1670738247)

All apps by Emil Aerenlund: https://appshunter.io/developer/1645551094

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-05.*