Icons8 App resides in the status bar and allows to search by tags, drag to Xcode, Photoshop, or anything.
You can use the following functions:
Icons8 App contains 34000 icons in multiple sizes (from 25x25 to 512x512 px) and formats (PNG, SVG, EPS). The icons are designed in 3 different styles: iOS, Windows, and Android.
All PNG files up to 100x100 px are free and included in the app. Vectors and bigger PNGs are available for a fee.