Comparison

Terrestrial Mollusc Key vs Bug Identifier App

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Terrestrial Mollusc Key

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
Read full description

The Terrestrial Mollusc key was specifically designed to assist in the identification of adult terrestrial slugs and snails of agricultural importance. The key also includes species of quarantine significance as well as invasive and contaminant mollusc species commonly intercepted at U.S. ports of entry. This key is designed for federal, state and other agencies or organizations within the U.S. that are concerned with the detection and identification of molluscs of significance. This key includes 33 families and 128 species. It should be noted that this key is not inclusive of all mollusc pests, as new species of interest arise almost daily. The list of species included in this key was generated based on pest species reported in scholarly publications by Barker 2002, Cowie et al. 2009, and Godan 1983 as well as commonly intercepted species documented in the port of entry interception data from US Department of Agriculture, Animal and Plant Health Inspection Service, Plant Protection and Quarantine division (USDA-APHIS-PPQ) and the Florida Department of Agriculture and Consumer Services (FDACS) -Division of Plant Industry. The key is unable to identify a few entities below the family level. This is true especially for the families Veronicellidae and Succineidae. The major reason for this is the lack of diagnostic morphological characters and the variability of members of these groups. In many cases, it is recommended that molecular techniques be used in the identification of members of these families (Holland and Cowie 2007; Gomes et al. 2010). This inadequacy of the key is, however, mitigated by the fact that most if not all members of these problematic groups are pestiferous and as such are regulated at the family level. The same is true for the species complexes (e.g., Arion hortensis group, A. ater group) included in the key. The Terrestrial Mollusc Key was developed and published by the Center for Plant Health Science and Technology (CPHST) as part of a cooperative agreement with the Department of Entomology and Nematology, University of Florida and the United States Department of Agriculture (USDA), Animal and Plant Health Inspection Service (APHIS), Plant Protection and Quarantine (PPQ) and is under the direction of Terrence Walters, CPHST Identification Technology Program (ITP) coordinator. The photographs utilized in this key were generously provided by those credited on each. The photographers and organizations that gave permission to use their images are also credited in the acknowledgements of the original tool (http://idtools.org/id/mollusc/). All drawings were produced by the University of Florida, unless otherwise noted. Author: Jodi White-McLean (Department of Entomology and Nematology, University of Florida) Editors and Advisors: John Capinera (Department of Entomology and Nematology, University of Florida) and John Slapcinsky (Florida Museum of Natural History, University of Florida) Original Illustrations and Photography: Kay Weigel and Lyle Buss (Department of Entomology and Nematology, University of Florida) Original Source: This key is part of the complete Terrestrial Mollusc Tool (requires internet connection) at http://idtools.org/id/mollusc/ Lucid Mobile key developed by USDA APHIS ITP

About

Bug Identifier App

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
Read full description

Would you like to know what bug or insect is it? No problem! Use the Bug Identifier App - Insect ID app to identify by photo more than 14,000 insect species classes, such as: Ants, Bees, Beetles, Bugs, Butterflies, Caterpillars, Centipedes, Cockroaches, Dragonflies, Flies, Leeches, Millipedes, Moths, Pests, Slugs, Snails, Spiders, Termites, Wasps, Weevils, Worms and more from all over the world. Discover the world of insects around you with the Bug Identifier App - Insect ID app! Whether you're a student, a nature enthusiast, or simply curious about the world around you, Bug Identifier App - Insect ID is the perfect app for anyone looking to learn more about the fascinating world of insects. Try it today and start exploring! 
 APP CONTENT & MAIN FEATURES:
 • Bugs & Insects Identifier:
 Simply take a photo or select photo from your gallery and get an accurate result in just seconds with detailed information about your identified insect, such as: probability, insect name, description, rank, taxonomy, similar images and more, but may vary. App can identify a wide variety of insects - more than 14,000 classes of insects from all over the world, from common household pests like ants and cockroaches, to more exotic species like butterflies and beetles, and others. 

• Texts Library:
 Read more than 20 interesting texts, such as: 10 World’s Most Beautiful Bugs & Insects and more. Note: For a more accurate insect identification, please take or select high-quality photo so that the insect is visible and is alone in the photo, avoid other insects in background. Disclaimer: While we strive to provide accurate insect identification, we cannot guarantee 100% accuracy in identification results. Note that free version of the app is limited to: – 1 Insect Identification; – 1 Text for Reading. If you want to use the app without limits an auto-renewable subscription ”Premium Access” is available. 
 Auto-renewable Subscription ”Premium Access” Info: By subscribing you get premium (full, unlimited) access to all the features and content offered by app. Auto-renewable Subscription “Premium Access” Includes: – Identify 14,000+ Insect Classes; – Identify Insects Unlimited; – Get Fast & Accurate Results; – Make Unlimited Insect Collection; – Unlock All Texts; The app contains the following auto-renewable subscription called ”Premium Access”: – Weekly (2,99 US$) with a 3-days for free period. * Subscription price may vary depending on your location; * Payment will be charged to iTunes Account at confirmation of purchase; * Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period; * Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal; * Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account; * Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Privacy Policy: https://sites.google.com/view/bug-insect-identifier-privacy/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Requested Access: Photos – access to upload selected photos of bugs or insects for identification. Camera – access to make photos of bugs or insects for identification.

Screenshots

Terrestrial Mollusc Key2 screens
Bug Identifier App4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
Terrestrial Mollusc Key versus Bug Identifier App: the parameters behind the verdict, then further details
ParameterTerrestrial Mollusc KeyBug Identifier App
PriceFreeFree
Rating5.0 (5 ratings) — better4.4 (80 ratings)
Positive reviews100.0% of reviews — better16.7% of reviews
Number of ratings580 — better
Update frequencyEvery 10 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS10.0 — better15.0
Further details — not scored
Size69 MB130 MB
Age rating4+4+
DeveloperUnited States Department of Agriculture-APHISUladzislau Yanushka

Customer experience

Terrestrial Mollusc Key

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bug Identifier App

All ratings80 ratings
Positive85.0%
Neutral5.0%
Negative10.0%
Written reviews6 reviews
Positive16.7%
Neutral16.7%
Negative66.7%

In-app purchases

None

Terrestrial Mollusc Key

No in-app purchases

1 purchases

Bug Identifier App

Subscriptions1
  • Premium Access3 Days trial$2.997 Days

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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