Believe it or not, I use an old software called Bento 4 by Filemaker. It’s a simple basic database program that I found works for me rather well. I do Filemaker programming & always thought I’d write an artists database with it, but the Bento just seems to work for me so I never wrote a new one.
Bento is is out of date & no longer manufactured or supported by Filemaker, but I did find it on Amazon for $12.99. I haven’t sync’d it with my iPhone but I believe it has the capability (I really should look into this!). It’s rather easy to setup, comes with some templates that you can modify somewhat. It is very visually easy to use. I currently have 667 paintings in it, with thumbnail images & data, and I track inventory along with sales & showings. I run Bento 4 on my iMac using OS 10.10.5 - I’d be glad to answer any questions about it, just let me know.