is Sonar X3d compatable with windows 10?

Yes.  I was running X3d when I upgraded to Windows 10. 

Hi. I would update to X3e.
https://www.cakewalk.com/Support/Knowledge-Base/2007013361/SONAR-X3e-Update
All the best.

Zargg71
Hi. I would update to X3e.

Or better yet, to SONAR 2016  - many improvements.

Anderton

Zargg71
Hi. I would update to X3e.

Or better yet, to SONAR 2016  - many improvements.

Even better (I just referred to the version he had)

Zargg71

Anderton

Zargg71
Hi. I would update to X3e.

Or better yet, to SONAR 2016  - many improvements.

Even better (I just referred to the version he had)

Even better still...... 
 
If you are running X3 producer why not take up the free offer to try Sonar Platinum free for 60 days.  Pretty sweet deal:) 
 
http://forum.cakewalk.com/SONAR-X3-Producer-customers-Get-the-full-SONAR-Platinum-experience-for-60-days-m3369332.aspx
 

Win10 was a pretty painless upgrade, it was a pleasant surprise! 
 
One thing to note about it, it loves to automatically fetch drivers on install, so if something is missing wait about ten minutes if you have an internet connection. When I came back scratching my head it had snuck out and installed my OctaCapture drivers for me! :-)
 

Its so simple even a cave child can do it!

...wicked
Win10 was a pretty painless upgrade, it was a pleasant surprise! 
 
One thing to note about it, it loves to automatically fetch drivers on install, so if something is missing wait about ten minutes if you have an internet connection. When I came back scratching my head it had snuck out and installed my OctaCapture drivers for me! :-)
 

My sentiments exactly.  SPLAT seemed to really like Win10 (lower latency).   About the way it handles driver updates it seems to me that I'm ok if I don't have Edge (or another browser) open it doesn't interfere with my programs.
 
The two things that happened to me were my webcam immediately died (but it was old & cheap) and my Korg nanoKontrol is really not functional anymore (but old & cheap).  No regrets here at all.  The thing is I don't mind being a couple of versions behind on my Windows OS, and we all have had problems over the years, but I don't like being 3 versions behind as I continually upgrade my software. 
 
XP & 7 were great, but not so much now.  I'm really glad that I haven't given Microsoft any money in over 2 & a half years, and I'm very pleased with Win10.

I love Windows 10 as much as I hated Windows 8. And I really hated Windows 8.