The previous version prior to Pro did have some vector capabilities but that has gone away in Pro although there is some discussion about a future vector graphics program.
I purchased Pixelmator and the developers of this have just release Pixelmator Pro. Pixelmator was and still is a Mac product purchased through the App Store. Photo Editing With Pixelmator ( download from App Store For Mac, Ipad/Iphone versions available) But still I find background removal and color tweaks with Pixlr amazingly easy to do. There is no login to use that is a pro and a con because if you don’t download your work its gone. Not all the features have been incorporated, specifically the transform and distort features that skew images and text. Pixlr Editor has been around awhile and the creators are now slowly migrating it to the newer online version called Pixlr X. Photo Editing Using Online Pilxr ( require Adobe Flash enabled on Mac)