buggydex vs Underfoot
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
buggydex
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- Use insect-rnapp to detect and recognize insect you see around you! - If you encounter an unknown insect and wonder if it is dangerous, you can use insect-rnapp to get information about it. - As you encounter more and more insect, you personal collection will be filled with their data to record your achievement.
Underfoot
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Underfoot is a field guide for anyone who can't walk past a bug without stopping to look. Photograph an insect, spider, or under-a-rock critter, get an AI identification suggestion, and add an illustrated specimen card to your collection. Try 5 photo identifications free in total, not per day. After those, more photo IDs require an Underfoot Pro subscription. No subscription starts automatically. Failed requests and photos with no identifiable bug do not use a free ID. Saving and browsing finds and the field guide are always free. HOW IT WORKS • Identify and compare. Check the suggestion against real reference photos, or choose a different species from the guide. AI can make mistakes. • Explore over 2,000 species. Browse insects, spiders, roly-polies, millipedes, snails, and other small creatures, with AI-generated illustrations in an ink-and-watercolor style. • Keep your own photos. See your find beside a reference image, enlarge either photo, and explore available life-stage images. • Collect wild finds. Save a species outside the bundled guide with an illustration generated for its card. • Know where to look. Read habitat tips, see seasonal suggestions, and explore nearby parks and trails. • Try something outside. Optional field activities and five observation walks help you slow down and notice more. QUIET BY DESIGN No public profiles, messaging, advertising SDKs, or cross-app tracking. Your nickname, collection photos, and field-activity progress stay on your device. Your collection is available offline. A parent should supervise a child's use. Photo identification requires your consent and an internet connection. Your selected photo goes through Underfoot's Firebase server to Google Gemini without your nickname or location. Anonymous identifiers, request counts, and technical diagnostics support the service; Google may retain requests for safety checks. Location is optional. See our privacy policy for details and deletion options. FREE & PRO Start with 5 free photo IDs. Pro provides more photo identifications with a monthly or yearly auto-renewable subscription. Prices and billing intervals are shown before purchase. Paid subscriptions renew automatically until canceled in your Apple account settings. Restore purchase is available on the Pro screen. Saving and browsing finds never requires Pro. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://underfoot.web.app/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: buggydex at none against Underfoot's 2. buggydex also leads on device support (3 vs 1) and iOS requirement (13.4 vs 17.0). Underfoot's advantage is update cadence (every 2 months vs every 26 months). On price and ads 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
Both are free to download. Underfoot sells 2 in-app purchases, starting at $2.99 per month. buggydex asks for nothing beyond the download.
buggydex ships an update every 26 months, Underfoot every 2 months. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.
| Parameter | buggydex | Underfoot |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 26 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 13.4 — better | 17.0 |
| Further details — not scored | ||
| Size | 48 MB | 102 MB |
| Age rating | 4+ | 4+ |
| Developer | Fei WU | Jason Brannon |
In-app purchases
buggydex
No in-app purchases
Underfoot
- Underfoot Pro$2.991 Month
- Underfoot Pro Annual$24.991 Year









