Ikona is described as 'Companion application to a vector editor like Inkscape, providing utilities for wrangling with icons and an icon preview' and is an app. There are 2 alternatives to Ikona for Mac, Linux, KDE Plasma, Flathub and Flatpak. The best Ikona alternative is Icon Explorer, which is both free and Open Source.
Icon Explorer allows artists and developers to preview and pick icons. Icon Explorer attempts to render the icons exactly as they would look drawn in the application. It allows to filter based on category and name.
Preview how your macOS app icon will look in the Dock and how your menu bar item icon will appear.
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