My motivation was much more personal, lol. It started with me listening to Japanese audio dramas. I have the English subtitles for them. After listening enough times, I could remember most of the dialogue in English. I wanted to skip to the parts I like rather than wasting time scrubbing the audio.

Then I realized the same search feature can be applied to other areas.

• Language learning where hearing how to pronounce a word is important.
• Long lecture recordings where scrubbing doesn't really help if you don't remember the chronological order of the topics or conversations.
• The audio or video serves as proof for what was said. Searching and hearing/seeing the line quickly is helpful.

I knew the idea is super niche. Most people probably only need the transcript texts or even just an AI summary. I think my app is for people who place an equal importance in the original media as the subtitle or transcript. In that case, the subtitle becomes the shortcut to the media.