Sticky Notes! is the easiest way to create stickies on Android.
Windows 10 Sticky Notes app has moved to the Windows Store
Easy Sticky Note Widget - Apps on Google Play
Color Notepad and Sticky Notes - Apps on Google Play
Sticky Notes
Notezilla: Sticky Notes for Windows 11/10/8/7, Android, iPhone/iPad (iOS)
Create and Sync Sticky Notes in Windows 10 and Windows 11
Sticky Notes
Microsoft Sticky Notes - Microsoft Apps
Floaty for Sticky Notes - Apps on Google Play