When comparing Voxel vs Paint3D, the Slant community recommends Paint3D for most people. In the question“What are the best voxel editors?” Paint3D is ranked 4th while Voxel is ranked 14th. The most important reason people chose Paint3D is:
Has a free trial version and a cheap full version.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Available on iOS
Voxel's availability on iOS enables you to be creative on your iPhone or iPad anywhere you please— at the park, on the train, in a meeting. Export options make it easy to sketch out an idea on-the-go and finish it up later in Qubicle or any other desktop voxel editor supporting the .qb format.
Pro Affordable
Has a free trial version and a cheap full version.
Pro Scripting support
Can be used to generate models, import stuff, animate, etc.
Pro Can export traditional 3D models
Pro Interoperates with 2D paint programs
Pro Supports multiple voxel formats
Pro Easy to use
Pro Uses 32-bit color with real volumetric transparency
Pro Supports both "per voxel" drawing and smooth "sculpting"
Cons
Con Only for iOS
Very limited audience and use.
Con iPad only
No desktop versions are planned.
Con The web site's domain is no longer available
Using the WayBackMachine to get the site's contact email address, I attempted to contact the developer to find out what the story is. There has been no response. The WayBackMachine's last archive date for the site was 11Jan2016. Their cached version of the paint3D.net's forum does not have any post explaining what happened.