# ZooMorphTrak vs Pinning

The clearest difference is in-app purchases: ZooMorphTrak at none against Pinning's 6. ZooMorphTrak also leads on rating (5.0 vs 4.7) and iOS requirement (9.0 vs 26.0). Pinning's advantage is update cadence (every 4 weeks vs every 4 months) and ratings volume (51 vs 1). On price and ads there is nothing between them.

Both are free to download. Pinning sells 6 in-app purchases, starting at $1.49 per month. ZooMorphTrak asks for nothing beyond the download.

ZooMorphTrak holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Pinning has 51 ratings behind it against 1, so its average is the more settled of the two.

ZooMorphTrak ships an update every 4 months, Pinning every 4 weeks. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | ZooMorphTrak | Pinning |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/zoomorphtrak/id1270560206/reviews)** | [4.7 (51 ratings)](https://appshunter.io/ios/app/pinning-days-until-countdown/id6472634746/reviews) |
| Number of ratings | 1 | **51** |
| Positive reviews | — | 75.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 4 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 20 MB | 48 MB |
| Requires iOS | **9.0** | 26.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Apple Watch, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Chicago Zoological Society](https://appshunter.io/developer/508261966) | [Anybox LTD](https://appshunter.io/developer/1518223648) |

## What reviewers say

### ZooMorphTrak

[App page](https://appshunter.io/ios/app/zoomorphtrak/id1270560206)

Estimate and compare Bottlenose Dolphin bodyweight using simple measurements like length and girth. This tool is designed for animal care specialists in institutional settings, offering approximate weight calculations and comparisons to wild dolphin data.

**Highlights:** Estimate dolphin bodyweight, Compare managed vs. wild dolphin weights, Input sex, age, length, and girth, Avoids need for scales or trained cooperation, Derived from long-term dolphin studies

**In-app purchases:** none


### Pinning

[App page](https://appshunter.io/ios/app/pinning-days-until-countdown/id6472634746)

Track important dates and milestones with a visually appealing countdown and calendar app. Organize events with notebooks, add custom icons, and display them on your home or lock screen with widgets. Share events with others via iCloud collaboration.

**Highlights:** Event countdown and count-up, Calendar event syncing, Birthday and anniversary tracking, Event organization with notebooks, Home and Lock Screen widgets, iCloud collaboration, Recurring event notifications

**Features:** Family Sharing, Apple Watch app, iPhone Duo support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.49 | per month |
| Monthly (Family Sharing) | $2.49 | per month |
| Yearly | $11.99 | per year |
| Yearly (Family Sharing) | $19.99 | per year |
| Lifetime | $19.99 | one-time |
| Lifetime (Family Sharing) | $31.99 | one-time |


## Frequently asked questions

### Is ZooMorphTrak free?

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

### Is Pinning free?

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

### Which has better reviews, ZooMorphTrak or Pinning?

ZooMorphTrak is rated higher. ZooMorphTrak averages 5.0 out of 5 from 1 ratings, while Pinning averages 4.7 from 51 ratings.

### Do ZooMorphTrak or Pinning have ads?

Neither ZooMorphTrak nor Pinning shows ads.

### Which is updated more often, ZooMorphTrak or Pinning?

ZooMorphTrak ships an update every 4 months, and Pinning every 4 weeks. Most recently, ZooMorphTrak was updated on November 3, 2026 and Pinning on November 4, 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.*