fit-ai is a strength-training app for people starting from zero, built to feel like a trainer beside you. A beginner full-body workout (squats, push-ups, plank and walking) is ready for you right away, and you log with a tap. Its AI coach then suggests just one next step based on what you actually did. It walks with you instead of judging you, and puts keeping going first.

Yes. Workout logging, the exercise library, progress charts, offline use, and AI coach consultations (5 per month) are free. Premium makes consultations unlimited, adds a higher-quality AI model and a choice of coach personas (4), and removes ads.

The AI coach looks at your workout log, goals, and body records and suggests just one next step. It starts from what you actually did—no grading, no comparing you with others. You can talk about meals, menus, and body changes by topic. Free plan: 5 consultations per month. Premium: unlimited.

Absolutely! fit-ai works offline so you can track your workouts anywhere, anytime. Your data syncs automatically when you reconnect to the internet.

fit-ai is available on both iOS and Android. Download it from the App Store or Google Play.

You can cancel your Premium subscription anytime from your account settings. Your access will continue until the end of your billing period.

Yes, we take security seriously. Data is encrypted in transit and at rest on our servers. We never sell your personal information to third parties. See our Privacy Policy for details.

You can reach our support team at support@fit-ai.jp or through the contact page.