iPhone Screenshots


Would you make a good drag racer? Maybe you already race and need a little more practice. Test and improve your reaction times with the Haulin Azz practice tree

Includes 0.000, 0.400 and 0.500 green light options, delay box, roll out adjustments, Sportsman and Pro trees.

- Have it with you wherever you go. Practice anywhere... at the track, lunch break, between rounds, in the bathroom

- Keep your mind sharp in between rounds

- People will wonder what you are doing with your phone!

A must have for any drag racing wishing to improve their reaction times and round winning chances or the casual user wishing to test their reflexes and reaction times.

Ratings and Reviews

4.0 out of 5
60 Ratings
60 Ratings
MasMolester ,

IOS 11 Needed!

I use this every raceday and because of IOS11 it stopped working!
I believe the developers should really look into just updating for IOS11 support, no need to change anything in the game.

Please bring this back, I need this or need to get a real practice tree! (This is cooler)

Mitch mays ,

Doesn’t work

It’s been months and still no update. How about updating or give us our money back.
Over a year still no update took our money and ignored the fact that your app quit working. If you are going sell an app it needs to be updated to keep it working. That’s just common sense that it will need to updated to keep working. If you have an iPhone don’t buy it because it doesn’t work

Bill from Perrysburg ,

I liked this app but it needs to be updated for IOS 11 and above

I think this app helped me get consistent reaction times but now it no longer works since I upgraded to IOS 11. Please update!!!!


Ron Hamm
15 MB

Requires iOS 4.2 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 9+ for the following:
Infrequent/Mild Profanity or Crude Humor
© 2012 Haulin Azz Drag Racing
In-App Purchases
  1. Full Version Practice Tree $1.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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