What resources are missing?

What resources are missing? Hi everyone, I'd like to first thank everyone for taking the time to read and/or comment on this post! to keep it short, I'm pursuing a career in speech-language pathology as I witnessed my dad's stuttering growing up. I'm still in school, but with my free time coming up, I'd love to build a website (ultimate goal would be an app, but $$) that acts as an interactive breathing practice/guidance, not only for my dad, but for others to use as well, if they find it helpful. I'd love to know if something like this already exists and maybe i should fill a different gap, or what features you would think would be helpful. All suggestions or comments would be super helpful! Thank you so much again