Practice any conversation.
Speak with confidence.
Practice client meetings, team standups, job interviews, and everyday conversations with AI that listens and responds in real time — in 97 languages.
Live practice room
Daily Conversation — Ordering at a Café
AI partner · café server
“Bonjour ! Qu'est-ce que je vous sers aujourd'hui ?”
Ready-to-go skills.
In any language you're learning.
skills.Practice the conversations you have every week — or prepare for the ones coming up. Client calls in English, interviews in Spanish, everyday life in Italian. Pick a skill, start speaking.
Client Meetings
Professionals who present, negotiate, or sell in a second language every week.
Handle objections, walk through proposals, close deals with confidence.
“Thanks for setting this up. We're evaluating a few options. Walk me through what you're proposing.”
Recruiter Sessions
Hiring managers and recruiters who interview regularly.
You run the interview. The AI plays the candidate.
“Hi, thanks for having me. I'm excited about this role. Where would you like to start?”
Networking & Events
Professionals attending conferences, meetups, and industry events.
Introductions, elevator pitches, and follow-up conversations.
“Oh hey, is this seat taken? I'm Alex — I just came from the panel on AI in healthcare. What brings you to the conference?”
Daily Conversations
Expats, remote workers, and anyone navigating life in a second language.
Office small talk, phone calls, errands, social situations.
“Hey! How's your week going? Been up to anything interesting lately?”
Travel & Daily Life
Frequent travelers and people relocating abroad.
Hotels, restaurants, airports, doctor visits, directions.
“Good evening, welcome to the Grand Hotel. Do you have a reservation?”
Describe it. Sierra builds it.
Tell Sierra what you need — your role, industry, language, and goal. It creates a custom skill with the right AI persona, questions, and feedback calibrated to your exact situation.
Three steps to confidence.
No textbooks, no scripts. Just real conversations that make you better every time you show up.
Pick your scenario
Choose a built-in Skill — client meeting, networking event, job interview, IELTS speaking — or create a custom scenario that matches your exact situation.
Speak with your AI partner
Have a real spoken conversation in any of 97 supported languages. The AI stays in character — client, colleague, interviewer, examiner — and adapts to your responses.
Review & improve
Get detailed feedback on pronunciation, vocabulary, and fluency. Track your improvement over time and see exactly what to work on next.
How people use Sierra.
And why they come back.
Sierra.From daily standups to once-in-a-career interviews. Every scenario you can speak through, Sierra can practice with you.
Client calls in a second language
You present to international clients every week. You need to sound confident and persuasive — not just grammatically correct.
A realistic client who asks tough follow-ups on numbers, ROI, and delivery dates.
Questions & answers
Sierra is an AI-powered conversation practice platform. Practice client meetings, team standups, job interviews, language exams, networking, and everyday conversations with AI partners that listen and respond in real time — in 97 languages.
