The best alternatives to CIO are Revolights, HALO BELT, and Monkey Lights. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of CIO?
Notion— Get over $6,000 worth of Notion + unlimited AI, for free
Lil' Lite might be little, but it's got big potential! I made it for fun, and becuase I wanted a bike light that's: 1. Easy to use (magically turns on and off by itself) 2. Fun (unlimited patterns) 3. Long lasting (20 hours) 4. Hackable and open source