The CLZ Music app is the same company as the Collectorz program on a Mac. You can check with them, but I think that you can purchase for a one time fee and then let your support for updates lapse, so that you would only need to purchase an update contract when they come out with a new feature that you want. That’s what I do for the PC version and the Android app, but I was grandfathered in on a Lifetime license.
Only their Music Connect program says that you always need an Active subscription, and it allows use on multiple computers and mobile devices. This App resides in the cloud, so you would need an internet connection to use it as opposed to having it installed locally on your computer.
Even though you may not need the advanced features, it is really quick and easy to add CDs to your database, especially if you have a bar code scanner (not included), which I highly recommend. If you want, you can now have separate databases for CDs and LPs. I haven’t tried cataloging LPs yet, so I don’t know how easy that is.
By uploading your database to their cloud storage, you can keep your Mac and iPhone database in sync. I have over 2200 CDs cataloged (and counting) and by having the App on my phone, I can easily check to see if I already have a CD when shopping, so that I don’t buy duplicates.
These guys are based in Germany and have provided quick response and excellent support the few times I have needed it. They are also working constantly to improve their product.
If you also want to catalog Movies, then they offer a small price break when you purchase both Music and Movie collector at the same time.
I have been using their software since 2002 and I highly recommend it.