Advice on app builders

Hey guys!
I want to make a mobile tool that receives input from an arduino sensor via Bluetooth and generates a sound accordingly.
Nothing complicated, just a simple pressure sensor to be responded by a short sound, but the response time must be very fast to none (is it far fetched on a budget?)
I have limited coding skills and zero app building skills so I thought of using an open source app builder of some sort.
Any recommendations on the tools to use and overall advice would be highly appreciated! Thanks in advance.
 
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