Strength IO: Workout Tracker

Intelligent strength training

Free · In‑App Purchases

New for iOS 27: an AI coach built on Apple Intelligence explains your readiness and training load, and smarter workouts give every muscle what it needs. Everything in. Your session out. Strength IO reads everything you do: your lifts, the runs, rides and games you log in other apps, and your recovery from Apple Health. Then it builds the strength session your body can handle today, and an AI coach explains why. WHAT IT DOES • Workouts built for your week: every muscle gets the sets it needs, with the right mix of movements. Your main lifts rotate among your favorites, and accessory lifts vary. • Weights anchored to real effort: each lift's weight comes from your own history. Heavy lifts that load your spine keep a rep in reserve, and tired muscles get pulled back. • AI coach: a short daily overview of your vitals, sleep and training, plus a note on your training load, built on Apple Intelligence. • Your whole week counts: logged a run in Strava, a ride on Peloton or a game in Apple Fitness? Strength IO reads it through Apple Health and adjusts today's lifting. No double-logging. • Readiness from five overnight signals: HRV, sleep, sleeping heart rate, breathing rate and wrist temperature, each judged against your own normal and combined into one daily estimate. It shows exactly what's lowering or raising your score. • Training load: your last 7 days against your usual 28, with a clear read on whether you're ramping up too fast, holding steady or backing off. • Records and plateaus: personal records for every lift, and early warning when one stalls. • Ready for iOS 27: heart-rate zones from your Apple Watch, and Siri answers about your readiness and today's workout. • Private by design: the AI coach uses Apple's models only, on your iPhone or on Apple's Private Cloud Compute. Never a third-party AI. BUILT FOR The multi-sport lifter. If you train 3–4 times a week, wear an Apple Watch, and also run, ride or play, Strength IO reads all of it. STRENGTH IO PRO Strength IO starts with a free trial of the full app, nothing held back. After the trial, a monthly or yearly subscription keeps everything unlocked. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the period. Manage or cancel anytime in your App Store account settings. Terms: https://strengthio.app/terms Privacy: https://strengthio.app/privacy iPhone & Apple Watch. AI coach requires an iPhone that supports Apple Intelligence. Estimates based on your data. Not medical advice.

Ratings & Reviews

  • 5.0
    out of 5
    1 Ratings

Strength IO is ready for iOS 27, and it now has an AI coach built on Apple Intelligence. AI COACH • Readiness overview: your coach reads your vitals, sleep and training and tells you where you stand today. • Training load insight: understand what your last 7 days mean for your body. • Powered by Apple Intelligence, on your iPhone or on Apple's Private Cloud Compute. NEW READINESS SCREEN • See exactly what's lowering or raising your score. NEW TRAINING LOAD • A load card and chart right at the top of the Training tab. iOS 27 • Heart-rate zones come straight from your Apple Watch. • Ask Siri what to train today, and start it right away.

Version 1.09

The developer, Crimson IO LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Health & Fitness
    • Contact Info
    • Identifiers
    • Usage Data

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Location
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
  • Crimson IO LLC
Size
  • 28.6 MB
Category
  • Health & Fitness
Compatibility
Requires iOS 26.4 or later.
  • iPhone
    Requires iOS 26.4 or later.
  • Apple Watch
    Requires watchOS 26.0 or later.
Languages
  • English
Age Rating
9+
In-App Purchases
Yes
  • Strength IO Pro $59.99
  • Strength IO Pro $9.99
  • Learn More
Copyright
  • © 2026 Crimson IO LLC
  • Developer Website
  • Privacy Policy

    • Supports

    • Family Sharing

      Some in-app purchases and subscriptions may be shareable with your family group when Family Sharing is enabled. Learn More

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