# IsoCal vs Currently One

The clearest difference is price: Currently One at Free against IsoCal's $14.99. Currently One also leads on update cadence (every 3 weeks vs every 2 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

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

IsoCal ships an update every 2 months, Currently One every 3 weeks. The most recent releases landed on October 7, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | IsoCal | Currently One |
| --- | --- | --- |
| Price | $14.99 | **Free** |
| 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 2 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 45 MB | 40 MB |
| Requires iOS | 15.1 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Emil Aerenlund](https://appshunter.io/developer/1645551094) | [Telldus Technologies AB](https://appshunter.io/developer/395971358) |

## What reviewers say

### 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


### Currently One

[App page](https://appshunter.io/ios/app/currently-one/id6444130357)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases:** none


## Frequently asked questions

### Is IsoCal free?

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

### Is Currently One free?

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

### Do IsoCal or Currently One have ads?

Neither IsoCal nor Currently One shows ads.

### Which is updated more often, IsoCal or Currently One?

IsoCal ships an update every 2 months, and Currently One every 3 weeks. Most recently, IsoCal was updated on October 7, 2026 and Currently One on October 18, 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.*