I was looking for an app to detect crashes for mountain biking and discovered this app. It seems to be a pretty new app by a solo developer but it's feature packed. I just tried it for a bike ride and besides the main feature - crash detection - it's great for tracking activities It's showing a graph for speed and elevation, you can export your track as GPX and a lot more. I feel like this app needs more exposure, unfortunately it's not open source, but it's still great. I'm not affiliated with the app or it's developers in any way, I'm just passionate for biking and technology.