Inspiration can come at any time and in any place. But it can also disappear just as easily. Many musicians record a quick hum on their phones to avoid forgetting a sudden melody, but these recordings often fail to fully capture the emotion and nuance of the moment. Everglow is a music sketchbook designed to turn inspiration into sound immediately. It combines a hardware interface for expressive performance with a generative AI-based sound system, allowing ideas to be shaped and developed on the spot.