AI variant generator
YouTube Studio (native A/B testing)
Best for: Any YouTube channel -- the ground-truth final test regardless of which AI tool generated variants
Where it fits in content creation work
Test up to 3 thumbnail/title variations on real viewers, winner chosen by watch time not just CTR
The essentials
Starting priceFree (built into YouTube)
Free tierFully free, native to all YouTube channels
RegionWest (Google/YouTube)