This app is super simple and does what it says it does in seconds. You can adjust the amount of sepia tone (but not the hue of the sepia), and you can toggle before and after before saving. BUT when I share the edited photo, Apple Photos will only share a very low-res version—basically thumbnail resolution that even looks blurry when viewed full-screen on a phone. Why? Pics look great on my side (I took the photos), and I’m sharing them from Photos app, not Sepia app. I share a lot of photos, and something’s off here. (FYI, I shoot in “RAW Max” mode on an iPhone 15 Pro.) If full-res sharing is a limitation, I have not discovered that in any documentation that I’ve read. As the first reviewer of this app, I’m hoping the developer will fix this severe shortcoming of a promising app.