# CalfScan vs HERD SD

The clearest difference is price: HERD SD at Free against CalfScan's $1.99. HERD SD also leads on update cadence (every 2 days vs every 18 months). CalfScan's advantage is iOS requirement (12.0 vs 14.0). On ads, in-app purchases and device support there is nothing between them.

HERD SD is free to download; CalfScan costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

CalfScan ships an update every 18 months, HERD SD every 2 days. The most recent releases landed on October 13, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | CalfScan | HERD SD |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/calfscan/id1491071213/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 2 days** |
| Monetization | Paid | — |
| Size | 6 MB | 33 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [University of Wisconsin - Madison School of Veterinary Medicine](https://appshunter.io/developer/871872159) | [Grazielle Cioletti](https://appshunter.io/developer/1825411960) |

## What reviewers say

### CalfScan

[App page](https://appshunter.io/ios/app/calfscan/id1491071213)

This app provides a graphical interface for storing and evaluating calf lung ultrasound scan results. It is designed as a tool to support specific livestock management philosophies.

**Highlights:** Graphical interface for data entry, Evaluation of calf lung ultrasound results, Supports WeanClean Philosophy implementation, Developed by veterinary medicine experts

**Features:** macOS Compatibility

**In-app purchases:** none


### HERD SD

[App page](https://appshunter.io/ios/app/herd-sd/id6748356498)

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

**In-app purchases:** none


## Frequently asked questions

### Is CalfScan free?

CalfScan costs $1.99, with no in-app purchases.

### Is HERD SD free?

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

### Do CalfScan or HERD SD have ads?

Neither CalfScan nor HERD SD shows ads.

### Which is updated more often, CalfScan or HERD SD?

CalfScan ships an update every 18 months, and HERD SD every 2 days. Most recently, CalfScan was updated on October 13, 2026 and HERD SD on September 30, 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.*