Sampled from 6 of Jupyter Notebook - JuCode's App Store screenshots — background, accent and theme, measured by LaunchShots (not something Apple publishes).
#0C0C0C bg
#2E2E2E
#2494DC accent
#FFFFFF text
JuCode is a Jupyter environment for iPhone and iPad that requires no setup, comes with native Python and Google Colab support. JuCode delivers a fully native notebook with integrated Python3 Compiler, allowing you to code, analyze data, and run machine learning projects anywhere. Designed for both beginners and professionals, JuCode makes working with notebooks faster, easier, and more portable than ever. Key Features Jupyter Support Create, edit, and run notebooks with complete functionality - including Markdown cells, code cells, adding or deleting cells, and viewing live outputs. Directly open and work with .ipynb files without converters or extra tools. Full Python 3 Integration Python runs entirely on iOS, offering support for essential libraries - pre-installed for instant use. No manual installations required; simply import and start coding. Zero Setup JuCode comes with most…
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 18 screenshots above are Jupyter Notebook - JuCode's answers to those questions — they're public, they're real, and they made it through Apple's review.
What the numbers say: Jupyter Notebook - JuCode runs a dark set with one background colour (#0C0C0C) carried across every screenshot — the listing reads as a single poster when the shots sit side by side in search results. The accent colour we picked up, #2494DC, 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.
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 →Closest background + accent colours among the listings we've analysed — useful when you want to see the same palette handled by a different team.