# IsoCalc vs Systemtherapien

The clearest difference is in-app purchases: Systemtherapien at none against IsoCalc's 2. Systemtherapien also leads on ads (none vs shown) and iOS requirement (13.0 vs 18.0). IsoCalc's advantage is update cadence (every 3 days vs every 2 months). On price and device support there is nothing between them.

Both are free to download. IsoCalc sells 2 in-app purchases, starting at $1.99 per month. Systemtherapien asks for nothing beyond the download.

IsoCalc ships an update every 3 days, Systemtherapien every 2 months. The most recent releases landed on October 17, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | IsoCalc | Systemtherapien |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.8 (6 ratings)](https://appshunter.io/ios/app/isocalc-isotretinoin-tracker/id1474971508/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 14 MB | 5 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Damian Szejnoch](https://appshunter.io/developer/1474971507) | [swiss4ward Europe S.L.](https://appshunter.io/developer/1012882836) |

## What reviewers say

### IsoCalc

[App page](https://appshunter.io/ios/app/isocalc-isotretinoin-tracker/id1474971508)

Track your Isotretinoin treatment progress with personalized profiles, automatic status updates, and photo tracking. Set reminders and manage your daily dosage with an intuitive slider.

**Highlights:** Individual treatment profiles, Automatic progress tracking, Photo progress tracking, Treatment reminders, Daily dose helper, Dose status slider

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Account | $1.99 | per month |
| Premium Account | $0.99 | one-time |


### Systemtherapien

[App page](https://appshunter.io/ios/app/systemtherapien/id1571459403)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is IsoCalc free?

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

### Is Systemtherapien free?

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

### Do IsoCalc or Systemtherapien have ads?

IsoCalc shows ads; Systemtherapien does not.

### Which is updated more often, IsoCalc or Systemtherapien?

IsoCalc ships an update every 3 days, and Systemtherapien every 2 months. Most recently, IsoCalc was updated on October 17, 2026 and Systemtherapien on October 3, 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.*