Recommendatory is a real if uncommon adjective meaning serving to recommend. It’s the formal word for what recommendation engines, review sites, and advisory services all do.
The rarity is the asset. It’s a genuine dictionary word, which means it sounds legitimate rather than invented, but it’s used seldom enough that nobody owns it. That combination is hard to find.
The fit is anything in the recommendation business: a review platform, a recommender system company, a curation service, a comparison site, or an advisory practice. Recommendation is one of the most commercially valuable functions in software, since it determines what people buy, watch, and read.
Fourteen letters and five syllables is on the long side, and that’s the honest trade-off. What you get is a precise word with no competitor, on the .com, with a clean trademark path because almost nobody has tried to use it.
Offers welcome.