Make YouTube subtitles slower, translated, and grammar-explained on-device

Make YouTube subtitles slower, translated, and grammar-explained on-device targets a $18.0B = 300M language learners × $60 annual learning-tool spend total addressable market with medium saturation and a year-over-year growth rate of 8% YoY (Statista / HolonIQ estimates for language-learning market in 2023-2025).

Key trends driving demand: On-device AI — Smaller transformer models and quantization make running translation/analysis on-device feasible, which enables privacy and offline use.; Creator-driven education — YouTube creators and microlearning formats are increasingly used for language learning, creating a distribution channel for learning tools.; Personalized micro-feedback — Learners expect sentence-level explanations and contextualized vocabulary, creating demand for tools that go beyond literal translation.; Privacy and low-latency expectations — Consumers are increasingly sensitive to cloud data sharing, favoring local inference and client-side features..