Company
Company Name
90us, Inc.
Founder
Hayato Hoshikawa
Location
San Francisco, CA
Incorporated
January 29, 2026 (Delaware)
Contact
Product
PopTalk: Learn Japanese with AI Characters
The number of Japanese language learners is growing at a CAGR of 15%, driven largely by anime, manga, and J-Pop culture. PopTalk is building an app that lets users practice Japanese through conversations with AI characters. Learn real Japanese through conversations with your favorite characters. We are creating a new language learning experience powered by "Entertainment × AI."
Strength
Core Technology: Generative AI / LLM Optimization for Consumer Services
We develop proprietary tuning technology specialized for entertainment experiences, not generic models.
- Character Tuning: Building LLM models that maintain character personality, tone, and worldview throughout dialogue
- Japanese TTS: Tuning technology that reproduces natural, emotionally expressive Japanese speech using AI voice synthesis