On Samsung S7, I use the native recording app and sometimes DU Recorder to record my games. Each has its perks. For the timer, I use a simple app called floating timer. It can get in the way of your playing, so make sure its in a good spot before you start recording.

On Amazon Kindle, I use SmartPixel to record, upload to Facebook, and download onto my computer. Then I add a timer in with a video editing software called ShotCut.

On my PC, I record using Fraps and time with LiveSplit. Fraps: http://www.fraps.com/download.php LiveSplit: https://livesplit.github.io/downloads/

If you have a different way of recording and timing, please share! Your feedback could help a new runner :D