Chart position — tracked daily by LaunchShots
Screenshot style breakdown
Sampled from 5 of Apollon - UML Modeling Editor's App Store screenshots — background, accent and theme, measured by LaunchShots (not something Apple publishes).
#F4FCFC bg
#D6DDDD
#143C64 accent
#111111 text
Reading the caption text from the screenshots in your browser…
Screenshots
iPad screenshots
Icon palette
About this app
Create UML and software-design diagrams with Apollon, the open-source editor for the web—now ready for iPhone and iPad. Apollon helps students, educators, software engineers, and architects turn ideas into clear, structured models. Start without an account, keep local diagrams on your device, and work offline. When you are ready, export your diagram or share it for feedback and live collaboration. What you can do: • Choose from 13 notations: Class, Object, Activity, Use Case, Communication, Component, Deployment, Petri Net, Reachability Graph, Syntax Tree, Flowchart, BPMN, and SFC. • Start with a blank canvas or a software-design pattern template. • Edit with a touch-friendly interface designed for iPhone and iPad. • Export to SVG, PNG, PDF, PPTX, or JSON. • Use light or dark appearance in portrait or landscape. • Create an optional share link; diagrams you keep local remain local. …
App details
What you can learn from Apollon - UML Modeling Editor
Every shipping app on the App Store has gone through the same decisions you're working through right now: which screenshot goes first, what caption sits over it, which device frame to show, what color the background should be. The 10 screenshots above are Apollon - UML Modeling Editor's answers to those questions — they're public, they're real, and they made it through Apple's review.
What the numbers say: Apollon - UML Modeling Editor runs a mixed light-and-dark set where the background shifts from screenshot to screenshot (first shot #F4FCFC) — each image has to stand on its own, so the captions carry more of the story. The accent colour we picked up, #143C64, is the one to reuse for badges, arrows and highlighted words if you borrow this look. Hit Use this style to open the editor with these exact colours and drop your own screenshot in.
Notice the first screenshot in particular. It's the one users see in search results and on the product page, and it's where most apps spend their best caption and tightest design. Look at the proportion of background to phone, where the text sits, what one thing the image is trying to communicate.
Want to see how other Developer Tools apps approach the same problem? Browse more Developer Tools apps in the showcase.
Take what works into your own screenshots
Open LaunchShots and design your App Store & Google Play screenshots — pick a device frame, drop captions, ship in minutes. Free, in your browser.
Open the screenshot editor →Apps with a similar look
Closest background + accent colours among the listings we've analysed — useful when you want to see the same palette handled by a different team.