Today I came across a toolkit for building corss platform DIY sensor recording apps on iOS and Android.
AntiMap http://theantimap.com/
"The AntiMap is an Open Source creative toolset for recording and visualising your own data. The project currently consists of a smart phone utility application (AntiMap Log) for data capture, and a couple of web/desktop applications (AntiMap Simple and AntiMap Video) for post analysis and data visualisation.