What is screenshot-studio?

Screenshot Studio is a macOS app that turns plain iOS simulator screenshots into a finished, polished gallery ready to upload to the App Store. It takes raw screen captures and frames each one inside a device mockup, adds a caption, places it on a styled background, and renders it at the exact pixel sizes Apple requires, so the results can go straight into App Store Connect. The workflow has two parts. First, a developer runs an automated UITest on their app that walks through each screen they want to show off and saves a numbered screenshot for both an iPhone and an iPad simulator, kept in separate folders. Second, they open that folder in Screenshot Studio, which builds a separate slide deck for the iPhone screens and one for the iPad screens, since the two device families are styled and exported independently. Inside the app, each slide can be given a headline and subtitle, placed inside a chosen device frame style, positioned and scaled on the canvas, and set against a background template. Multiple languages can be configured within the same project file, and exporting or uploading handles every configured language in one action. Projects are saved automatically as a small file on the user's machine, and reopening a project re-reads the original screenshot folder, so a new round of captures can be styled with work already done. The app can also connect directly to App Store Connect using an API key stored in the user's login keychain, letting someone review, check screenshot limits, and publish a new version's gallery without leaving the app. The project also offers a companion skill file so a coding agent like Claude Code can run the capture test and drive the styling and upload steps when asked to make App Store screenshots for an app. The app requires macOS 14 or later and is free to use, with an optional donation link for anyone who wants to support ongoing development.