# References On Tap vs ZooMorphTrak

The clearest difference is in-app purchases: ZooMorphTrak at none against References On Tap's 2. ZooMorphTrak also leads on rating (5.0 vs 4.7) and iOS requirement (9.0 vs 15.0). References On Tap's advantage is ratings volume (304 vs 1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. References On Tap sells 2 in-app purchases, starting at $4.99 per year. 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: References On Tap has 304 ratings behind it against 1, so its average is the more settled of the two.

References On Tap ships an update every 2 months, ZooMorphTrak every 4 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | References On Tap | ZooMorphTrak |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (304 ratings)](https://appshunter.io/ios/app/references-on-tap/id1092709557/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/zoomorphtrak/id1270560206/reviews)** |
| Number of ratings | **304** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 68 MB | 20 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ReferencesOnTap](https://appshunter.io/developer/301316543) | [Chicago Zoological Society](https://appshunter.io/developer/508261966) |

## What reviewers say

### References On Tap

[App page](https://appshunter.io/ios/app/references-on-tap/id1092709557)

This app helps you find, display, and import reference information and PDFs from various academic databases. Organize your references into groups, perform advanced searches, and sync your library across devices. It offers both a one-time purchase for core features and a subscription for cloud syncing.

**Highlights:** Search academic databases (arXiv, Google Scholar, PubMed, etc.), Import reference information and PDFs, Organize references in static and smart groups, Advanced boolean and full-text search options, Sync libraries across iOS and macOS devices via iCloud, Share references for reading or import

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $4.99 | per year |
| Standard | $4.99 | one-time |


### 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


## Frequently asked questions

### Is References On Tap free?

References On Tap is free to download, with in-app purchases available.

### Is ZooMorphTrak free?

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

### Which has better reviews, References On Tap or ZooMorphTrak?

ZooMorphTrak is rated higher. References On Tap averages 4.7 out of 5 from 304 ratings, while ZooMorphTrak averages 5.0 from 1 ratings.

### Do References On Tap or ZooMorphTrak have ads?

Neither References On Tap nor ZooMorphTrak shows ads.

### Which is updated more often, References On Tap or ZooMorphTrak?

References On Tap ships an update every 2 months, and ZooMorphTrak every 4 months. Most recently, References On Tap was updated on November 2, 2026 and ZooMorphTrak on November 3, 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.*