Alexa's icon style is minimalist and slightly rounded. The simplicity of the design allows for the icons to complement the messages within the UI. The icons scale properly for their size and stroke weight, in accordance with Android convention. Most commonly, icons are used as image buttons to indicate a state or action.
Because the Alexa platform is designed to display on a vast range of devices with varied screen sizes and resolutions, you need to consider how icon assets will scale up or down with the various resolution capabilities of these devices for your experience.
To use image based icons in your Alexa experience, you will need to provide an asset for each of the six primary density classes. For example, if you have an icon that is 72 x 72 pixels for medium-density screens, you will need to provide that same icon in all of the following sizes: (54, 72, 108, 144, 216, 288).
Icon density chart
|Icon Size Examples||Multiplier||Classification||PPI|
|54 x 54 px||.75x||ldpi||~120 ppi and below|
|72 x 72 px (baseline)||1x||mdpi||~160 ppi|
|108 x 108 px||1.5x||hdpi||~240 ppi|
|144 x 144 px||2x||xhdpi||~320 ppi|
|216 x 216 px||3x||xxhdpi||~480 ppi|
|288 x 288 px||4x||xxxhdpi||~640 ppi|