Best for
Listings where a checked page actually names 9:16. Everything else stays off this list.
Alibaba · Model
Alibaba's HappyHorse video model. Runway Dev prices 720p and 1080p. Alibaba's API reference lists duration and aspect ratio, including 9:16.
24fps · Templates
Library of AI-made motion graphics with prompts, plus an MCP server and a skill that searches the library before an agent writes a new film.
lonthq · Captions
Open caption format: one word stored once, then cut for 16:9 or 9:16. MIT. Ships an agent skill.