20 AI answers to 5 prompts name 15 brands. Casa del Libro leads with 19.6% of mentions; the top 3 hold 49.5%.
Brands and sources in the sampled answers
Share of brand mentions in Online bookstores answers
Fragmented: no brand dominates. The top 3 hold 49.5% of mentions; the leader 19.6%.
Every engine sampled
