StringTheories is an online marketplace for guitar tutors that allows users to compare different tutors and filter by categories such as acoustic and electric, before sending a message to arrange a lesson. The app was built using the no-code platform Bubble, which enabled Alex Cooney to bring his vision to life with flexibility and customization options. With the help of Bubble's community, Alex was able to overcome any technical challenges and successfully launch his marketplace. Since its launch, StringTheories has facilitated 20 guitar lessons across Ireland, and plans to expand into other instruments and international markets in the future.