Accent training app for language learners who sound like tourists

Three years on Duolingo. A thousand lessons under her belt. She can navigate a restaurant menu in Spanish, handle ordering, and get through a cab ride without incident. Yet every time she speaks in Madrid, locals immediately switch to English. Her vocabulary holds up. Her grammar gets by. But her accent betrays her before she finishes her first sentence. Language apps are great at teaching words — they're terrible at teaching you how to pronounce them well enough that people stop defaulting to English. Sounding Sentences analyzes speech down to individual phonemes and factors in where each learner is coming from linguistically. Spanish speakers wrestle with sounds their language simply doesn't have — "v" turns into "b," "th" vanishes entirely. Mandarin speakers face a completely different set of hurdles: mixing up "r" and "l," swallowing word endings, letting tonal patterns from their mother tongue creep into flat English intonation. The app pinpoints the specific interference patterns tied to each user's native language and constructs exercises targeting precisely the sounds that trip them up. No one-size-fits-all corrections — instead, focused remediation grounded in measurable linguistic distance. The tech stack leverages Google Cloud Speech or Azure for pronunciation evaluation. A comprehensive error database gets organized by language pairing — Spanish-to-English, Mandarin-to-English, Japanese-to-English, Portuguese-to-English — drawing on established linguistics research to map documented interference patterns into structured drill progressions. Visual tools like side-by-side spectrograms let learners compare their recordings against native speaker benchmarks, while animated diagrams illustrate exact tongue and lip positioning for troublesome sounds. English serves as the initial target language, with Spanish and Mandarin speakers representing two enormous, well-researched markets where phoneme gaps are thoroughly cataloged. The premium tier costs $39 per year, unlocking complete pronunciation curricula and granular sound breakdowns. Monthly competitions featuring community leaderboards are available at $5 per month. Distribution strategy includes partnerships with YouTube polyglots who excel at language instruction but have no way to deliver individualized pronunciation coaching. Duolingo has vocabulary locked down. Babbel dominates grammar. But accent remains unclaimed territory. Sounding Sentences plants its flag there.