# The Calving Book Plus vs GreenBug

The clearest difference is in-app purchases: GreenBug at none against The Calving Book Plus's 1. The Calving Book Plus's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 16.0). On price, update cadence and ads there is nothing between them.

Both are free to download. The Calving Book Plus sells 1 in-app purchase, starting at $14.99 per year. GreenBug asks for nothing beyond the download.

The Calving Book Plus ships an update every 5 weeks, GreenBug every 3 weeks. The most recent releases landed on October 24, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | The Calving Book Plus | GreenBug |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.9 (8 ratings)](https://appshunter.io/ios/app/the-calving-book-plus/id1076776098/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 26.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Monetization | Subscription | — |
| Size | 41 MB | 2 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [The Calving Book App, LLC](https://appshunter.io/developer/1015726597) | [Oklahoma State University](https://appshunter.io/developer/393442180) |

## What reviewers say

### The Calving Book Plus

[App page](https://appshunter.io/ios/app/the-calving-book-plus/id1076776098)

Easily manage calf records, including identification, birth details, and comments. Access your data offline and across devices. This version also tracks breeding, pregnancy checks, and weaning.

**Highlights:** Calf ID, birth weight, gender tracking, Offline functionality, Cross-device account access, Breeding and pregnancy tracking, Weaning record management, Search and edit records

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| The Calving Book Plus | $14.99 | per year |


### GreenBug

[App page](https://appshunter.io/ios/app/greenbug/id6682915096)

**In-app purchases:** none


## Frequently asked questions

### Is The Calving Book Plus free?

The Calving Book Plus is free to download, with in-app purchases available.

### Is GreenBug free?

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

### Do The Calving Book Plus or GreenBug have ads?

Neither The Calving Book Plus nor GreenBug shows ads.

### Which is updated more often, The Calving Book Plus or GreenBug?

The Calving Book Plus ships an update every 5 weeks, and GreenBug every 3 weeks. Most recently, The Calving Book Plus was updated on October 24, 2026 and GreenBug on October 8, 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.*