Flowchart.js might be a bit more popular than App Icon Resizer. We know about 1 link to it since March 2021 and only 1 link to App Icon Resizer. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Resizeappicon.com — A simple service to resize and manage your app icons. - Source: dev.to / almost 3 years ago
What problems do you have with all the existing options (just a couple links I picked from a google search)? Source: about 2 years ago
MakeAppIcon - MakeAppIcon resizes and optimizes your icon designs into all formats needed for iOS and Android mobile app!
Code2Flow - An easy solution to create product flows.
EasyAppIcon - EasyAppIcon helps you to create your own app icons easily. Supporting Android Adaptive Icon!
DIagrams Through Ascii Art - Java command-line tool to convert ASCII diagrams to bitmaps.
App Icon Maker - Create icons for mobile app stores online for free.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.