# iMammalia vs Ring Sizer

The clearest difference is rating: iMammalia at 5.0 against Ring Sizer's 2.0. iMammalia also leads on in-app purchases (none vs 2) and update cadence (every 3 weeks vs every 3 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Ring Sizer sells 2 in-app purchases, starting at $9.99 per 7 days. iMammalia asks for nothing beyond the download.

iMammalia holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

iMammalia ships an update every 3 weeks, Ring Sizer every 3 months. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | iMammalia | Ring Sizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/imammalia/id1480199644/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/ring-sizer-finger-measure/id6759689480/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | **Free** | Subscription |
| Size | 51 MB | 56 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Centre for Ecology and Hydrology](https://appshunter.io/developer/986306797) | [Wotaso GmbH](https://appshunter.io/developer/1850131192) |

## What reviewers say

### iMammalia

[App page](https://appshunter.io/ios/app/imammalia/id1480199644)

Record wild mammal sightings across Europe with this app. Submit your observations, with or without photos, for expert verification and contribute to mammal distribution mapping. All records can be managed and updated online.

**Highlights:** Record mammal sightings, Photo uploads optional, Expert verification of records, Contribute to distribution mapping, Online record management, Supports European countries

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

**In-app purchases:** none


### Ring Sizer

[App page](https://appshunter.io/ios/app/ring-sizer-finger-measure/id6759689480)

Easily determine your ring size using your finger or an existing ring. Supports various international sizing systems to help you avoid ordering the wrong size. Measurement results are recommendations and should be verified before purchase.

**Highlights:** Measure finger size, Measure existing ring size, Supports international sizing systems (EU, US, UK), Quick and simple to use, Reduces ordering wrong ring sizes

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ring Sizer Pro Weekly | $9.99 | per 7 days |
| Ring Sizer Pro Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is iMammalia free?

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

### Is Ring Sizer free?

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

### Which has better reviews, iMammalia or Ring Sizer?

iMammalia is rated higher. iMammalia averages 5.0 out of 5 from 2 ratings, while Ring Sizer averages 2.0 from 1 ratings.

### Do iMammalia or Ring Sizer have ads?

Neither iMammalia nor Ring Sizer shows ads.

### Which is updated more often, iMammalia or Ring Sizer?

iMammalia ships an update every 3 weeks, and Ring Sizer every 3 months. Most recently, iMammalia was updated on November 7, 2026 and Ring Sizer on October 31, 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.*