Chart position — tracked daily by LaunchShots
Screenshot style breakdown
Sampled from 5 of ROX Index's App Store screenshots — background, accent and theme, measured by LaunchShots (not something Apple publishes).
#FCFCFC bg
#DDDDDD
#EC2C24 accent
#111111 text
Screenshots
iPad screenshots
Icon palette
About this app
The application is designed for doctors and medical students that helps to calculate ROX. ROX is an index that is formulated to predict the chance of success or failure of HFNC. It has been studied mostly in patients with Pneumonia. It is calculated as – Oxygen saturation (SpO2) / Fraction of Inspired Oxygen (FiO2) X Respiratory rate (RR) (Range for SpO2 : 70% – 100%, Range for FiO2 : 21% – 100%, Range for RR : 12/min – 70/min) As is obvious, the higher the index, the better is the chance of success. Ref link - https://www.med-specialists.net/wp-content/uploads/2021/04/ROX-Index-Management-Guidelines-of-HFNC-MSA.pdf
App details
What you can learn from ROX Index
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 ROX Index's answers to those questions — they're public, they're real, and they made it through Apple's review.
What the numbers say: ROX Index runs a light set where the background shifts from screenshot to screenshot (first shot #FCFCFC) — each image has to stand on its own, so the captions carry more of the story. The accent colour we picked up, #EC2C24, 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 Medical apps approach the same problem? Browse more Medical 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.