Decelerator allows you to customize the acceleration setting of your mouse or trackpad. While System Preferences can change the tracking speed, it doesn't actually allow you to modify the factory default acceleration setting. There are a number of reasons you might want to do this:

1. Gamers often disable mouse acceleration entirely to gain a competitive edge in "twitch" reflexes. With mouse acceleration off, a distance on-screen corresponds with an exact distance your hand must move, and is unaffected by the speed with which it moves there.

2. Windows users often find Mac OS X's relatively high mouse acceleration disorienting and frustrating. Lowering the mouse acceleration can go a long way to easing the transition to a new operating system.

3. Some people prefer higher or lower acceleration settings for many reasons both logical and illogical. If you're one of those people, then Decelerator allows you to tweak to your heart's content.

Decelerator costs $1 (and no, I don't believe in reminding you how that compares to a cup of coffee, though I guess I just did!), with 70 cents of each purchase going to the "feed a starving developer" fund. I've been using the app very happily for the last few months, and I hope it's as useful (in fully unproductive ways!) for you as it has been for me. If you have any comments or suggestions, I'd love to hear them on the forums at

One more thing. I hate it when developers charge upgrade fees to users, so new Decelerator versions will ALWAYS be free for existing users.


Ok, two more things. If you have a problem, please please please contact me instead of (or at least in addition to) submitting a bad review. Developers have no way of contacting reviewers for details, and since I am unfortunately confined to only 5 senses, I can't actually fix "Horrible aplication I ever bought". I tried to address the 3 negative reviews so far here:


Version 1.0:
* First public release!

Ratings and Reviews

3.5 out of 5
14 Ratings
14 Ratings

Doesn't work


Using a Razer Lachesis, I have acceleration turned off in my mouse's firmware. Unfortunately, this app does nothing to disable Mac OS mouse acceleration for me. Which is a real disappointment because I thought I had finally found a way to disable the god awful acceleration. Oh well.

It is compatible with Lion!

Jeremy Gaudet

Does work with OS X 10.7 Lion. Would be even better if the application could adjust the mouse speed, since with this program enabled, the usual settings under system preferences do not function.

Also, if you're a gamer like myself, it works with starcraft 2.

doesnt work


Mouse accelleration in osx (mountain lion) is broken. Nobody seems to have a fix. I was hoping this app would solve it but it doesnt. I should have noticed the last time this app was updated was in July 2011 and their forum/support is abandoned.
Save your money and use a terminal script hack (which is all this is app is doing anyways).
This app is garbage.


Calder Coalson
428.7 KB
Age Rating
Rated 4+
© Bulldozer Software 2011


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