It certainly appears to be. That's a bit confusing, however. Every example photograph rather prominently notes the camera, not phone, it was taken with. The features seem primarily useful for camera-and-raw-processing photographers. The website doesn't seem to indicate that it's iPhone only, but the feedback section, and the lack of any way to log in or sign up other than the link to the iOS App Store, certainly suggests that it is. The feedback section even suggests that it doesn't support iPads well, and is phone-focused.

What's the intended usage here? Take a photograph with your camera, transfer it to your computer, process it there, export it... then transfer it to your phone in order to post it? Why?

It's not a great workflow but everyone serious does it with instagram, too (even with phone photos, doing post on the phone is awful).

But that's the only way to use instagram, and I don't think it's great workflow.

Pretty common for mobile apps to start on iOS only.

Especially since iOS users spend more money. From my experience, you can have equivalent apps for iOS and Android, yet the iOS version will drive 90% of revenue. If I were them I wouldn't bother creating an Android version until they've proven the model works with iOS. If it doesn't work with iOS, adding Android will only slow their dev velocity and increase their burn rate.

It's becoming a chicken or the egg issue. Every time I open up Play store "premium" apps section is complete trash and "freemium" apps are design in either milking the ads (free but 20 second ad after every action) or the whales (paying 160usd/year subscription for a phone app) - no one is serving middle-class consumer on Android. Then creators complain that there's no middle-class consumer market on Android?

Glass already went to the trash bin for me. If you can barely support 1 app at 5usd/month price point what sort of longevity message is that sending?

But why not an webapp from the beginning ?