AI-Powered Running

Run Smarter.Train Better.

Rex remembers your goals, adapts to your life, and connects you with your coach and community. Your personal AI training partner.

Download Free on iOS See How It Works

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Memory & Intelligence

Rex knows you

Rex remembers your training preferences, race history, and upcoming goals. By reading your health metrics and completed activities, Rex provides suggestions and actionable insights — not generic advice.

Your Dashboard, Your Goals

See your distance goal, upcoming race countdown, and fitness metrics (CTL/ATL/TSB) — all at a glance. Rex knows what matters to you.

AI-Powered Activity Insights

After every run, Rex analyzes your pace, heart rate, and aerobic trends. Not just data — actionable insights tied to your race goals.

Ask Rex Anything

Chat with Rex about your training load, recovery state, or next steps. Rex remembers every run, every goal, every conversation.

Your Running Journey

Monthly activity calendar, race history with photos and times — Rex builds a living record of your running life.

Home screen with distance goal ring and fitness metrics

Monthly calendar showing activity history

Coach & Training

Know what's next

Rex bridges you and your coach. See your training calendar, know exactly what to do each day, and dive into every workout detail. Coach adjusts, Rex delivers.

Training Calendar

Your weekly plan at a glance — easy runs, tempo sessions, rest days. Assigned by your coach, synced automatically.

Activity Deep Dive

Route maps, pace splits, heart rate zones — every detail from your Garmin or Strava, all in one place.

Group Training

Follow the same plan as your training group. Share workouts, compare notes, and stay accountable together.

Social & Community

Never train alone

See who's training for the same race. Compete on leaderboards. Share your runs with beautiful auto-generated cards. Running is better together.

Global Leaderboard

Weekly and monthly distance rankings. See where you stand, and give kudos to fellow runners pushing their limits.

Social Sharing

Auto-generated share cards with your pace, distance, and route overlay — ready for Instagram, Strava, or your running group.

Race Buddies

Know who's attending the same race and following the same plan. Connect before race day and train together.

Social sharing card with pace and distance

Discover

Explore races & plans

Find your next race — from Boston to Berlin. Pick a training plan that matches your level. Your running journey starts here.

Upcoming Races

Browse marathons worldwide. See who's going, how many participants, and add it to your calendar with one tap.

Training Plans

Beginner to advanced. 4 weeks to 16 weeks. Pick a structured plan and Rex will guide you through every workout.

Free Tools

Level up your training

No account required. Useful tools for runners, by runners.

Popular

Runner Personality Test

Discover your running personality type. Are you a Consistent Cruiser, a Weekend Warrior, or a PB Chaser?

Take the Test →

Calculator

Training Pace Calculator

Enter your recent race time and get recommended training paces — easy runs, tempo, intervals, and more.

Calculate Paces →

Coming Soon

Race Predictor

Rex predicts your race times based on training data and recent performances. From 5K to marathon.

Coming Soon

Training Plan Generator

Tell Rex your goal race and current fitness level. Get a personalized training plan that adapts as you progress.

Coming Soon

Run Smarter.Train Better.

Rex knows you

Your Dashboard, Your Goals

AI-Powered Activity Insights

Ask Rex Anything

Your Running Journey

Know what's next

Training Calendar

Activity Deep Dive

Group Training

Never train alone

Global Leaderboard

Social Sharing

Race Buddies

Explore races & plans

Upcoming Races

Training Plans

Level up your training

Runner Personality Test

Training Pace Calculator

Race Predictor

Training Plan Generator

Ready to run smarter?

Are you a running coach?