iPhone Screenshots


Fieldguide.ai is to the pocket field guide, what Wikipedia is to the encyclopedia—a crowd-sourced compendium of all natural and cultural things.

"Leps" is Fieldguide's dedicated ID assistant and community for lep lovers (Lepidoptera: moths & butterflies). Use Leps to:

Identify species ~
Leps analyzes your moth/butterfly photos to suggest possible IDs that can be later verified by the Fieldguide community.

Record your observations ~
Leps arranges your observations into a dynamic checklist. When taxonomic treatments change, your records update automatically.

Showcase your collection ~
Sharing collection data builds a richer picture of Lepidoptera morphology, phenology, and distribution.

Connect with enthusiasts ~
Follow people who share your curiosity and interests.

You can also publish your lep photos on the web:

What’s New

Version 1.4.10

Bug fixes and improvements

Ratings and Reviews

4.9 out of 5
9 Ratings

9 Ratings

L E P B O Y E ,

This app is straight 🔥

Moments after downloading this app I was floored. The app has an impressively smooth, well-designed user interface all while being incredibly intuitive and easy to use. This app is really the future of citizen science and can be useful to people from seasoned experts to novices who've never identified a butterfly in their lives.
If you have any interest in learning about butterflies and moths get this app. It must've taken a huge effort to create this app and it really shows when you use it.

Developer Response ,

Sweet, thanks so much for the great feedback :)

RDub76 ,

Keeps getting better!

This is a fantastic app for IDing, logging, and discovering species of moths and butterflies. The developers are constantly updating the app with improvements and fixes.

Developer Response ,

We're sad that you couldn't load the app :(

We know the cause...certain Internet Service Providers had blocked our domain name (fieldguide.net) because that domain was blacklisted by several security sites due to poor behavior of the previous owner of that domain name. We didn't realize that until recently and now the domain is whitelisted with all the major security sites. We have also since moved the apps off that domain so the new version should work on all wifi connections. This is more background info than you care to know, I'm sure, but wanted to explain the issue.

Again, sorry that it didn't load for you!

CASSI Swan ,

My new favorite app

I am 17 years old and i have been obsessed with lepidoptera for about a year. I saw a post about this app on the Moth Week twitter and instantly knew i had to download it. As soon as i started uploading pictures to the app, i wondered where the app had been this past year. I've only had it for a few hours, and i'm already addicted. Thank you, Andre Poremski, for your creation.

Developer Response ,

YAY :)


Change Theory Corp
70 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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