Intelligent Coaching Utility (ICU Coach)

AI Tools
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Hi everyone,

I’m excited to share a project I’ve been working on: Intelligent Coaching Utility ICU Coach, a mobile companion app designed specifically to extend the power of Intervals.icu with advanced AI-driven insights and automated coaching.

A bit about me

I’m a solo developer and a triathlete. Like many of you, I spend a lot of time analyzing my data here on Intervals.icu. I built ICU Coach out of my own needs as a triathlete—trying to balance Swim, Bike, and Run while making sure I’m recovering properly and hitting the right intensity at the right time.

ICU Coach isn’t just a generic fitness app. It understands the nuances of multi-sport training. Whether you are focused on a single discipline or balancing all three, the app uses your Intervals.icu data to provide a “Single Source of Truth” for your training.

Key Features

  • :high_voltage: AI Coach: Generates personalized daily workouts based on your current fitness, fatigue (CTL/ATL/TSB), and specific training goals. It adapts in real-time to how you are actually recovering.
  • :stopwatch: Recovery Pro: A multi-system recovery engine that tracks Metabolic, Neuromuscular, and Hormonal systems. It uses a “Percentile Gate” (HRV/RHR) to prevent overtraining and tell you exactly when you’re ready for that next interval session.
  • :trophy: Race Predictor: Accurate performance forecasting for your target races using your power/pace data and training history.
  • :stethoscope: AI Performance Labs: Deep-dive analysis into your Sleep quality, HRV trends, and Weekly training efficiency.
  • :fork_and_knife_with_plate: Chef AI: Personalized nutrition plans matched to your daily training load and dietary preferences.

:bullseye: The “One-Click” Sync

One of the most important features I focused on is the seamless integration. With the built-in Workout Builder or AI Coach, you can create a structured workout and, with a single click, upload it directly to your Intervals.icu calendar. From there, it automatically syncs to your watch and platforms like Zwift, so you can just hit ‘Start’ and go.

:man_teacher: For Coaches

If you’re a coach, I’ve built a dedicated Coach Mode. You can manage your entire athlete roster, monitor their recovery status in real-time, and generate AI-powered reports for your athletes directly through the app.

Check it out

The app is available in 5 languages (EN, TR, DE, FR, ES) and supports both BYOK (Bring Your Own Key) for Gemini/OpenAI and a Cloud AI option for a zero-setup experience.

You can check out more details, see the architecture at: icucoach.app

I’d love to hear your feedback and suggestions. As a fellow Intervals.icu user, I’m committed to making this the best possible companion for this amazing platform.

Happy training!

Some screen shots from app

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1 Like
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[Post Deleted]

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Quick update for Apple Watch users — I’ve added two new features on top of the existing Apple Health integration (which already syncs sleep, HRV, resting HR, weight, SpO2, steps etc. to your Intervals.icu wellness).

What’s new:

1. Apple Watch Workout Sync Your watch workouts now sync directly to Intervals.icu — GPS route, heart rate, distance, calories, elevation. Run, Ride, Swim, Walk, Hike, Row.

2. True Overnight HRV Instead of a single HRV reading, the app now averages all HRV samples during your actual sleep window. More accurate trend tracking.

What to test:

  1. Turn on “Apple Watch Sync” in Settings
  2. Hit “Sync Now” — last 7 days of workouts should appear in Intervals.icu
  3. Check: duration, distance, HR graph, GPS map — all look right?
  4. If you sync via Strava/Garmin too — any duplicates?
  5. Compare overnight HRV value with Apple Health
  6. Try different workout types if you can

TestFlight link (10 spots):

You’ll need an iPhone with Apple Watch. Any subscription prompts in TestFlight are sandbox purchases — no real charges, so feel free to explore all features. Let me know how it goes — screenshots of anything weird are super helpful.

App Store link for the released version: : ‎ICU Coach App - App Store

1 Like
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Another quick update — ICU Coach is now available on both stores: :blush:

Google Play: https://play.google.com/store/apps/details?id=com.murataydin.icucoach

App Store: ‎ICU Coach App - App Store

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Hey everyone,

Quick update on what’s new in ICU Coach:

Voice Coach — Listen to Your Coach All 16 AI report screens now have a “Listen to Coach” button. The AI reads your analysis out loud using on-device text-to-speech — no internet needed, zero cost. You can pick your preferred voice in Settings → Preferences. Great for reviewing your morning report while warming up.

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Apple Watch Workout Sync (Beta) If you train with an Apple Watch, ICU Coach can now sync your workouts directly to Intervals.icu via TCX upload — including heart rate and GPS data. Enable it in Settings → Profile & Health. This is especially useful if you don’t use Garmin/Polar/Suunto but still want your workouts on Intervals.icu.

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Hi Murat, like your app and used it for a couple of days. Just bought the Pro Account on the App Store, but can’t connect to intervals.icu anymore today. Getting “Invalid client key” error… Can you help?

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Hi. First of all — thank you for going Pro, and I’m sorry for the trouble on day 1. I am on it right now.

I’ll get back to you within 30 minutes with a status update. Sorry for inconvenience.

— Murat

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Hi. Found the root cause from your error data — your intervals.icu
OAuth grant is missing some scopes (likely CALENDAR access). This
prevents the AI report from generating.

Quick fix (you can do now, ~2 minutes):

  1. Go to Intervals.icu → “Authorized Apps”
  2. Find “ICU Coach” in the list and click “Revoke”
  3. Open the ICU Coach app
  4. Tap Profile → Sign Out
  5. Sign in again with intervals.icu — this time, make sure to
    approve ALL the requested permissions     on the intervals.icu
    page (Activity, Wellness, Calendar, Settings — all four)

That should restore full access. Let me know if it works!

One quick question on your end — did you mean to subscribe to Coach mode (which is built for managing 5 athletes as their coach), or was it an accident? The regular Athlete Pro plan looks like a better fit for how you’re using the app.
If the Coach choice was unintentional, here’s what I can do: I’ll switch your account to Athlete Pro and grant you a full year free to make up for the mix-up. (Apple already processed the Coach charge so I can’t refund that side, but a full year of Athlete Pro is worth quite a bit more than what you’ve paid.) You’d just need to cancel the Coach subscription in your iPhone’s Settings → Apple ID → Subscriptions so it doesn’t auto-renew next month.
Just let me know either way and I’ll set it up right away!

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Still Error: Connection failed. App authentication failed.

Did all the resets.

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Hi Falko,
I replied to your PM with detailed information.