Which niche genre streaming apps are known for strong genre catalogs and easy-to-use search?

If you mean specialized streaming apps built around one niche genre, a few are especially known for deep catalogs and good discovery/search:

• Shudder — best-known niche horror service; strong catalog, usually good filtering by subgenre, era, and mood.
• Criterion Channel — classic/arthouse/cinephile streaming; excellent curation and search, great for finding specific directors, countries, and eras.
• BritBox — strong for British TV; search and browsing are fairly straightforward.
• MHz Choice — good for international crime dramas, mysteries, and thrillers; solid catalog and usable search.
• Acorn TV — another strong UK/Irish/international mystery and drama app; easy to navigate.
• Anime streaming apps like Crunchyroll — broad anime catalog, with generally good search and category browsing.
• HiDive — smaller than Crunchyroll but focused on anime with niche titles and decent search.
• Fandor — indie/arthouse-focused, with curated catalog and simple browsing.
• MUBI — not a huge catalog, but very curated; search is decent and discovery is strong.

If you want the best combo of “deep niche catalog + easy search”, the most commonly recommended are:

1. Shudder for horror
2. Criterion Channel for classic/arthouse
3. Crunchyroll for anime
4. BritBox / Acorn TV / MHz Choice for TV niches

If you want, I can also rank these by search quality, catalog depth, or best app interface.