Speak like a native in your next interview - Sierra - AI tutor speaker

Hi! Really excited to finally share what we’ve been building. I’m the founder of Sierra. We’re a small team obsessed with one problem: helping people sound fluent when it matters most, the interview, the client call, the visa appointment, the promotion talk. What is Sierra and why is it called so? Sierra is an AI speaking tutor for language learners. You already know the language in your head, you read, you listen, you understand. Sierra helps your mouth catch up with your brain. You speak out loud, Sierra listens, corrects your pronunciation and phrasing, and gives you the sentence a fluent speaker would have used. We call it Sierra because it’s about climbing your own “mountain” of confidence, one conversation at a time. Not with grades or tests, but with real practice that feels close to life. What makes Sierra different? Most language apps teach you words and grammar, but they don’t really prepare you for the actual moment: the job interview, the standup, the exam speaking part. They give you exercises. Sierra gives you a live tutor for the exact scenario you care about. You describe the conversation you want to master, a Google PM interview, a TOEFL speaking task, a client call in French, and Sierra builds the tutor around it: the voice, the questions, the pushback, and the feedback. Every mistake becomes a correction, an explanation, and a better, more natural way to say it. The problem & our solution We meet so many learners who “know” English (or another language) but freeze when it’s time to speak. They overthink, hedge, and lose words right when the stakes are highest. Traditional tools focus on memorizing vocabulary, not on what actually happens when you open your mouth in front of another human. Sierra is built for that exact moment. You rehearse out loud in 97 languages, get interrupted where a fluent speaker would stop you, and see in simple language what to fix and how to say it better next time. Features & benefits 1. Scenario-based practice Practice real situations: IELTS and TOEFL tasks, tech interviews, client calls, standups, salary talks, networking, and more. Pick a ready-made scenario or describe your own and start speaking in under a minute. 2. Real-time corrections and fluent phrases As you talk, Sierra catches your slips in pronunciation, grammar, hedging, and word choice, and shows you how a fluent speaker would say the same thing, with examples you can reuse. 3. Custom skills from your own material Feed Sierra YouTube talks, websites, PDFs, or rubrics, and it builds a tutor around them. Perfect if you’re preparing for a specific exam, a company interview, or a talk. 4. Progress you can see and share After each session, you get a simple breakdown: what improved, where you still hesitate, and which phrases you’re adding to your toolbox. You can share full sessions with teachers, tutors, or friends who are helping you. 5. Built for 97 languages Practice in your target language, not just English. The same “speak, stumble, get corrected” loop works across many languages. Who is Sierra for? Sierra is for anyone who already knows the language but wants to sound fluent when the moment arrives. 1. Professionals and founders Practice client calls, standups, demos, and investor pitches so you don’t second-guess every sentence when it’s live. 2. Students and test takers Rehearse IELTS and TOEFL speaking parts with strict examiners that push you, correct you, and help you sound more natural. 3. Immigrants and job seekers Get comfortable answering interview questions, talking about your experience, and discussing money and promotions without freezing. We’d love to hear what conversations you’re working toward. Drop a comment and tell me: which scenario is hardest for you right now (job interview, exam, client call, something else)? Happy to share how we’re using Sierra to help people rehearse those exact moments.