Not yet — but the site is mobile-first, and you can add it to your home screen so it behaves like an app for capturing receipts at the counter.
There's no native app in the App Store or Play Store yet. The web app is built mobile-first and handles the one thing that has to work on a phone: photographing a receipt while you're still at the counter.
To make it feel native, add it to your home screen:
You get an icon, full-screen launch, and direct camera access from the upload form.
Capturing at the counter matters more than the app wrapper does. Receipts you intend to photograph later are receipts you lose.