# Terrestrial Mollusc Key vs Bug Identifier App

The clearest difference is review sentiment: Terrestrial Mollusc Key at 100% against Bug Identifier App's 17%. Terrestrial Mollusc Key also leads on rating (5.0 vs 4.4) and in-app purchases (none vs 1). Bug Identifier App's advantage is update cadence (every 6 weeks vs every 10 months) and ratings volume (80 vs 5). On price, ads and device support there is nothing between them.

Both are free to download. Bug Identifier App sells 1 in-app purchase, starting at $2.99 per 7 days. Terrestrial Mollusc Key asks for nothing beyond the download.

Terrestrial Mollusc Key holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Bug Identifier App has 80 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 100% of Terrestrial Mollusc Key's written reviews are positive against 17% of Bug Identifier App's.

Terrestrial Mollusc Key ships an update every 10 months, Bug Identifier App every 6 weeks. The most recent releases landed on October 23, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Terrestrial Mollusc Key | Bug Identifier App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/terrestrial-mollusc-key/id818984385/reviews)** | [4.4 (80 ratings)](https://appshunter.io/ios/app/bug-identifier-app-insect-id/id6446084091/reviews) |
| Number of ratings | 5 | **80** |
| Positive reviews | **100.0% of reviews** | 16.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 6 weeks** |
| Monetization | **Free** | Freemium |
| Size | 69 MB | 130 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [United States Department of Agriculture-APHIS](https://appshunter.io/developer/511305053) | [Uladzislau Yanushka](https://appshunter.io/developer/1464429742) |

## What reviewers say

### Terrestrial Mollusc Key

[App page](https://appshunter.io/ios/app/terrestrial-mollusc-key/id818984385)

This reference tool aids in identifying adult terrestrial slugs and snails of agricultural and quarantine significance. It covers species commonly intercepted at U.S. ports of entry, including invasive and contaminant molluscs. The key features 33 families and 128 species, with detailed information for detection and identification.

**Highlights:** Identification of adult terrestrial slugs and snails, Covers species of agricultural importance, Includes quarantine and invasive species, Features 33 families and 128 species, Based on scholarly publications and interception data

**Features:** macOS Compatibility

**In-app purchases:** none


### Bug Identifier App

[App page](https://appshunter.io/ios/app/bug-identifier-app-insect-id/id6446084091)

Identify over 14,000 insect species by photo. Get detailed information, including probability, name, and taxonomy. Explore a library of interesting texts about insects. Unlock unlimited identifications and content with a premium subscription.

**Highlights:** Identify 14,000+ insect species, Identify by photo or gallery image, Detailed insect information, Insect taxonomy and similar images, Library of 20+ insect texts, Unlimited identifications with premium

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Access | $2.99 | per 7 days |


## Frequently asked questions

### Is Terrestrial Mollusc Key free?

Terrestrial Mollusc Key is free to download, with no in-app purchases.

### Is Bug Identifier App free?

Bug Identifier App is free to download, with in-app purchases available.

### Which has better reviews, Terrestrial Mollusc Key or Bug Identifier App?

Terrestrial Mollusc Key is rated higher. Terrestrial Mollusc Key averages 5.0 out of 5 from 5 ratings, while Bug Identifier App averages 4.4 from 80 ratings.

### Do Terrestrial Mollusc Key or Bug Identifier App have ads?

Neither Terrestrial Mollusc Key nor Bug Identifier App shows ads.

### Which is updated more often, Terrestrial Mollusc Key or Bug Identifier App?

Terrestrial Mollusc Key ships an update every 10 months, and Bug Identifier App every 6 weeks. Most recently, Terrestrial Mollusc Key was updated on October 23, 2026 and Bug Identifier App on October 27, 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.*