HDD Fan Control2.5

I had previously purchased HDD Fan Control and installed it on an iMac 27 with a replacement (non-Apple) hard drive. It worked fine, but I have now installed a SSD in place of the HDD and HDD Fan Control is no longer activated. I went through the process on their website to be re-notified of the serial number, but although the number came through OK it is not accepted by the activation dialog. This software has only ever been installed on this Mac. I have tried contacting their support by email but have had absolutely no response. My guess is that their activation server is now offline and the lack of a response to my emails suggests that the company is no longer in business. Beware!

Works perfectly on my 2010 iMac running macOS Sierra after replacing the original hard drive with an SSD.

Very difficult to remove.....

I'd give minus 5 stars if I could for this VIRUS app !
I installed this and used for 2 days I got unsatisfied with its inner fan control system and decided to delete it. I clicked the remove in pref pane, however the app was still in application folder, I removed this too!

I discovered that my RIGHT FAN was not working (via another software).
After 2 hours struggling to fix the issue and reseting SMC a dozen times, I discovered that those irresponsible lame developers made a daemon that always runs, and still runs after I uninstalled the app.

I forced quit the daemon but it kept coming back, the devil... I finally found it in lib/lunchdeamons and removed it, but still my Right Fan was broken at 300 RPM...

Then I reset SMC once again and my fan finally came back to life !

35$ ?! I wish the developers would pay me 3500$ for all the work and time I wasted dealing with this VIRUS app!

I purchased this app after trying out the demo. The demo seemed to work, but now my fan is back to full speed. I've tried adjusting settings in Preferences (btw i think that interface is well designed), but to no affect. The menu-bar display says my fan should be at 1372 rpm, although the preferences target says it should be at 1100. I can hear my fan running very loud as before installing this software; much much faster than 1372.

$30 to fix a simple problem? Vulture-ware. Do yourself a favor and use a free fan controller.