# Adhuna vs DrObsCalc

The clearest difference is in-app purchases: Adhuna at none against DrObsCalc's 1. Adhuna also leads on iOS requirement (13.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. DrObsCalc sells 1 one-off in-app purchase. Adhuna asks for nothing beyond the download.

Adhuna ships an update every 4 weeks, DrObsCalc fortnightly. The most recent releases landed on October 1, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Adhuna | DrObsCalc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Fortnightly** |
| Size | 39 MB | 11 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Tank Maternity and Surgical Hospital LLP](https://appshunter.io/developer/1096493690) | [Eng Loy Tan](https://appshunter.io/developer/1876155118) |

## What reviewers say

### Adhuna

[App page](https://appshunter.io/ios/app/adhuna/id6757327135)

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

**In-app purchases:** none


### DrObsCalc

[App page](https://appshunter.io/ios/app/drobscalc/id6759258402)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Clinical Milestones Pro | $6.99 | one-time |


## Frequently asked questions

### Is Adhuna free?

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

### Is DrObsCalc free?

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

### Do Adhuna or DrObsCalc have ads?

Neither Adhuna nor DrObsCalc shows ads.

### Which is updated more often, Adhuna or DrObsCalc?

Adhuna ships an update every 4 weeks, and DrObsCalc fortnightly. Most recently, Adhuna was updated on October 1, 2026 and DrObsCalc on October 28, 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.*