Speed Logger Free is an Android app developed by thepenguin77 that allows you to record your GPS speed and acceleration while doing any activity. The app plots the recorded data in a graph, making it easy to visualize and analyze. It is a free app available in the Utilities & Tools category.

The app has several features, including recording of acceleration (accelerometer) data, GPS speed, and altitude. It can calculate your vertical velocity, air time/jump distance, and turn radius. The graph view and table view make it easy to analyze the data. You can use this app for activities like skiing, snowboarding, roller coasters, biking, driving, flying, running, gymnastics, and anything where you experience some strange speed or acceleration that you want to record. It is a great app for anyone who wants to know just how fast they were going or how much force they endured during an activity.