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STAS AI — an AI coach that actually adapts.

An assessment-driven AI fitness and lifestyle coach — voice and text coaching, five languages, and subscription tiers — that tailors guidance to each user instead of serving the same generic plan.

The challenge

A coaching product only works if it feels personal. That means starting from a real assessment, adapting to each user, and meeting them how they prefer to interact — by voice or by text, in their own language. On top of that, it needed a subscription model with tiers, all wrapped in an experience smooth enough that people keep coming back.

What we built

📝

Assessment-driven onboarding

Guidance built from each user's real starting point.

🎙️

Voice + text coaching

Interact the way that suits the moment.

🌍

5 languages

A coach that speaks the user's language.

💳

Subscription tiers

Recurring billing with multiple plans.

🧠

Adaptive AI

Coaching that adjusts to the individual over time.

📱

Fast, mobile-first UX

A smooth experience that keeps users engaged.

The stack

Next.js AI Coaching Voice AI Subscriptions

Built on Next.js with AI at the core and subscription billing integrated — a foundation that supports voice, multilingual text, and adaptive coaching in one product.

The outcome

See it live at stas-ai.com.

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