Most "best AI voice" pages rank on whichever demo clip sounds most impressive, and skip the part that decides whether you can actually use the tool. Ours is different, and we show it on every guide.
What we use
Every comparison is built from three inputs: the tool's official feature and pricing pages, its license terms and terms of service for commercial use, and community-reported quality from musicians who use it (framed as community sentiment, not a lab measurement). We read the licensing, because it is the input most likely to affect a real release.
What we do not do
We do not claim to have produced a full track in every tool and A/B tested audio quality in a studio. That kind of claim is common and almost never true. When we describe how a tool sounds or behaves, it comes from the official materials and disclosed community consensus, not an invented benchmark.
The commercial-rights read
This is what sets SoundStack apart. For every tool we note whether its output is royalty-free for commercial release, whether the voices are the tool's own synthetic or licensed voices versus a cloned real artist who would need clearing, and whether cloning is restricted to your own or consented voices. That is the single most useful thing a working musician needs to know, and it is missing from nearly every other roundup.
How the featured slot works
Some guides carry one clearly-labeled featured placement from a tool. It never changes the independent rankings on the page. See featured placements. SoundStack is part of the Lattice network of independent buying guides.