Is 24GO free?

Yes, 24GO is free to download and use for everyone. 

You can add the 24GO Audio Coaching Subscription to get access to 150+ Treadmill, Elliptical, Outdoor Run/Walk, Stationary Bike and Rower Workouts. The subscription is $3.99 a month or $39.99 a year. The monthly subscription includes a one-time, 7-Day Free Trial to try these workouts; at the end of your 7-day trial, you will be charged your monthly subscription fee.