Transform your smartphone into a drawing tool. Trace photos and illustrations onto paper with adjustable outline thickness and screen brightness. Perfect for aspiring artists of all skill levels.



70+ iOS apps curated and reviewed
The best kenichi yamamoto apps on iPhone average 3.7★ across 70+ titles — we've ranked them by what real users actually keep on their phones. Updated July 2026.



Transform your smartphone into a drawing tool. Trace photos and illustrations onto paper with adjustable outline thickness and screen brightness. Perfect for aspiring artists of all skill levels.






Enhance your photos with custom color palettes. This app automatically extracts colors from images and allows you to add a variety of palette designs, adjust the number of colors, and position them freely. It's a simple tool for adding a fashionable touch to outfits, landscapes, and illustrations.




This interval training timer assists with HIIT, Tabata, and other interval workouts. It features voice counting for elapsed and remaining time, customizable settings, and automatic calendar recording of completed sessions. The display uses color to show training status, and it supports background operation.


Quickly save and organize favorite content from any app, including articles, videos, and places. Access your saved items by category with a simple swipe, ensuring nothing gets lost. Ideal for those who frequently bookmark information for later reference.


Easily loop specific sections of YouTube videos for repeated viewing or listening. This tool allows you to set start and end points for infinite playback and can also mirror videos horizontally. It's ideal for learning, practice, and detailed analysis.








Create unique and vibrant photo filters from your existing images. Apply a wide range of artistic tones, from vintage to fantasy, to enhance your photos. Easily adjust brightness, saturation, and contrast for a more emotional and Instagram-ready look.


This app estimates your remaining lifespan and calculates how many more times you can engage in desired activities. It aims to encourage users to reflect on their daily choices and appreciate the preciousness of time.






This app guides you through slow training exercises with voice and screen prompts for lifting, holding, and lowering. Create custom training menus with adjustable repetitions, sets, and intervals. Supports background operation and dark mode for convenient use during workouts.













