# HeatSiecker vs Calf Keeper

The clearest difference is in-app purchases: HeatSiecker at none against Calf Keeper's 4. Calf Keeper's advantage is update cadence (every 2 weeks vs every 2 months) and rating (4.2 vs 4.0). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Calf Keeper sells 4 in-app purchases, starting at $5.99 per month. HeatSiecker asks for nothing beyond the download.

Calf Keeper holds the better App Store score, 4.2 against 4.0. That said, the two scores are not equally well evidenced: Calf Keeper has 5 ratings behind it against 1, so its average is the more settled of the two.

HeatSiecker ships an update every 2 months, Calf Keeper every 2 weeks. The most recent releases landed on October 7, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | HeatSiecker | Calf Keeper |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/heatsiecker/id1481223172/reviews) | **[4.2 (5 ratings)](https://appshunter.io/ios/app/calf-keeper/id6477791805/reviews)** |
| Number of ratings | 1 | **5** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 35 MB | 56 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Brent Sieck](https://appshunter.io/developer/1481223171) | [CattleSync, LLC](https://appshunter.io/developer/542917312) |

## What reviewers say

### HeatSiecker

[App page](https://appshunter.io/ios/app/heatsiecker/id1481223172)

This app connects to a wearable patch on cows to monitor mounting activity. It provides real-time data on heat cycles, helping farmers determine the optimal time for breeding. Users can scan patches, pair them with cow IDs, create breeding groups, and receive text updates.

**Highlights:** Monitor mounting activity, Accurate time and date of activity, Scan patch and pair with ID, Create breeding groups, Receive text updates

**Features:** macOS Compatibility

**In-app purchases:** none


### Calf Keeper

[App page](https://appshunter.io/ios/app/calf-keeper/id6477791805)

This app helps livestock owners manage their herds by tracking calf births, linking animals, and calculating calving dates. Premium features allow for custom data fields, animal scoring, photo uploads, and collaborative herd management.

**Highlights:** Calf birth tracking, Herd linking (cows, bulls), Gestation calculator, Customizable data fields, Animal scoring, Photo uploads, Collaborative herd management

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calf Keeper Plus (Monthly) | $5.99 | per month |
| Calf Keeper Pro (Monthly) | $9.99 | per month |
| Calf Keeper Plus (Yearly) | $59.99 | per year |
| Calf Keeper Pro (Yearly) | $99.99 | per year |


## Frequently asked questions

### Is HeatSiecker free?

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

### Is Calf Keeper free?

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

### Which has better reviews, HeatSiecker or Calf Keeper?

Calf Keeper is rated higher. HeatSiecker averages 4.0 out of 5 from 1 ratings, while Calf Keeper averages 4.2 from 5 ratings.

### Do HeatSiecker or Calf Keeper have ads?

Neither HeatSiecker nor Calf Keeper shows ads.

### Which is updated more often, HeatSiecker or Calf Keeper?

HeatSiecker ships an update every 2 months, and Calf Keeper every 2 weeks. Most recently, HeatSiecker was updated on October 7, 2026 and Calf Keeper on October 10, 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.*