RunIntensity: Training Load

Your 40 miles this week hit like 55. RunIntensity is the running app that knows the difference.

Distance and pace don't tell you how hard a week really was. A hilly run in the heat or a tempo on tired legs costs more than the mileage suggests. RunIntensity scores every run in Stress-Adjusted Miles (SAM), a five-factor training load model built from heart rate, terrain, surface, cumulative fatigue and conditions. Your weekly mileage becomes a weekly training load you can plan around.

TWO NUMBERS, ONE ANSWER EVERY MORNING
RunIntensity reads what your watch already writes to Apple Health and scores two things separately, 0–100:

• Recovery — heart, nervous system and sleep. HRV, sleep and resting heart rate against your own baseline. Snaps back overnight.
• Freshness — muscles, tendons and joints. How much of your recent training your legs have absorbed. Drops with a hard session, climbs back over hours or days.

Then one call: Ready, Steady or Recover. Ready only when both are high; Steady when one system is still catching up; Recover when rest is the workout. Recovered isn't the same as healed — this is the app that knows when you're overdoing it.

KNOW WHAT TO DO TODAY
Your verdict, today's workout, your weekly training load budget and a one-tap start. Widgets, Siri ("What's my readiness?") and Control Center keep it one glance away.

FREE FOR EVERY RUNNER
• Stress-Adjusted Miles — the real cost of every run
• Recovery, Freshness and a daily Ready / Steady / Recover verdict
• Weekly SAM budget with mid-week pacing tips
• 26-week training load charts
• Training planner with periodized phases and race milestones
• Personal records and trophies
• Shoe mileage tracking
• Body soreness tracker — spot patterns before you overdo it
• The peer-reviewed research behind every number

WORKS WITH ANY WATCH
Apple Watch, Garmin, COROS, Polar and more — any run that syncs to Apple Health flows in automatically, duplicates merged. No manual logging.

APPLE WATCH APP
• Workouts from your wrist with live heart rate, pace and distance
• Race Pace interval timer with custom segments and repeats
• Complications and Watch widgets with Recovery, Freshness and today's verdict
• Live Activity on the Dynamic Island during workouts

FRIENDS & THE BOARD — FREE
See how your friends are training: readiness, training load, workouts, reactions, weekly leaderboards, head-to-head challenges and streaks.

COACH BRADY — YOUR AI RUNNING COACH ($19.99/year, 7-day free trial)
An AI running coach that has actually read your training. Every answer is grounded in your readiness, training load and workout history. Coach Brady plans workouts onto your calendar, sends weekly reviews and tracks your goals. Includes the web coach dashboard.

COACH MODE — FOR COACHES ($39.99/year)
Everything in Coach Brady plus unlimited athletes and groups, side-by-side readiness and load comparisons, assigned plans and push notifications when athletes sync.

Coach Brady and Coach Mode require Sign in with Apple and an auto-renewable subscription.

PRIVACY FIRST
Core calculations happen on your device. RunIntensity reads Apple Health but never writes to it, and syncs only what you choose to share. No ads. No analytics SDKs. No tracking. A training tool, not a medical device.

REQUIREMENTS
iOS 17.0 or later; watchOS 10.0 or later for the Watch app (optional). Sign in with Apple for Friends, Coach Brady and Coach Mode.

SUBSCRIPTION TERMS
Coach Brady and Coach Mode are auto-renewable yearly subscriptions charged to your Apple ID at confirmation and renewed automatically unless cancelled at least 24 hours before the end of the period. Manage or cancel in Settings > Apple ID > Subscriptions.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://www.zerodi.net/runintensity-privacy