Last year, for EAA's Founder's Innovation Prize competition, I made a < $100 sensor pod with an Arduino variant connected to a differential pressure sensor, with Bluetooth to an iOS App. The general idea was that the pod would attach to a GoPro style mount and provide pitot static data to an iOS device and cost about as much as a "Stratux" DIY device, but for pitot-static and other flight data instead of ADS-B.
I did not get selected by the EAA -- other similar things were selected to present during AirVenture. However, other than the $2000 Levil BOM Pod, I have not seen anything further in this space, and nothing further from the other EAA Founders Prize Finalists.
I have not tested it in flight (I just got a steam-gauge RV-6A that I may try this out on once I get transition training and comfortable with the airplane), but, when I saw this thread, I figured I would share this for educational/discussion purposes here: