Submarine Player

What it does

Submarine Player is a Mac video player that creates subtitles for any video file as you watch it. It uses AI models to detect speech, transcribe it, and translate into your chosen language, all processed locally on your device. It is built for people watching foreign media or learning languages who want instant subtitles without hunting for files.

Submarine Player is a Mac app that generates subtitles while you watch a video. It uses on-device AI models to detect speech, transcribe it, and translate it into your chosen language. The official page says it supports 19 languages and common video formats such as MP4, MKV, AVI, and MOV. It can show original and translated subtitles side by side, which may help language learners. Subtitle generation runs locally, so it works without an internet connection. Online translation is optional and can be turned off for fully offline use. The app requires an Apple Silicon Mac with macOS 15 or later. The free plan allows 7 subtitle generations per week. Paid plans add unlimited subtitle generation, high accuracy models, dual subtitles, export, and batch processing. The page notes that on-device subtitles may not fully match manually created subtitles.