What is the difference between PEAKVO2 and IntervalCoach?

IntervalCoach is an AI training coach that decides what you should do: every day it reads recovery signals like HRV, sleep, and training load and reshapes a periodized plan across cycling, running, swimming, and strength, syncing with Intervals.icu. PEAKVO2 is a training app that runs the session: it guides eight VO2 max interval protocols like the Norwegian 4x4 on iPhone and Apple Watch with full-screen phases, haptics, and heart rate zones, plus built-in field tests. IntervalCoach plans the training; PEAKVO2 runs it.

Should I use PEAKVO2 or IntervalCoach?

Use IntervalCoach if you want an AI to build and adapt a whole endurance program around your recovery and periodization, especially if you already use Intervals.icu and train multiple sports. Use PEAKVO2 if you want to actually run VO2 max interval sessions, guided on your wrist, and test your VO2 max directly, without managing a full training platform. Some athletes use IntervalCoach to plan and PEAKVO2 to run the hard intervals.

Does IntervalCoach run guided interval workouts on your wrist like PEAKVO2?

IntervalCoach is primarily a planning, coaching, and analytics app: it generates and adapts workouts and can schedule them to the Apple Watch Workouts app, but its focus is deciding your training from recovery data, not being a full-screen in-session interval runner. PEAKVO2 is built for the session itself, running each protocol on the wrist with color-coded phases, automatic transitions, and a haptic tap at every switch.

Does IntervalCoach need another service, and does PEAKVO2?

IntervalCoach syncs with Intervals.icu, so it fits athletes who already use that platform. PEAKVO2 works on its own: you download it and run a protocol, with no external training account required. If you want a self-contained VO2 max trainer, PEAKVO2 is simpler to start; if you want deep planning tied to Intervals.icu, IntervalCoach is built for that.

How much do PEAKVO2 and IntervalCoach cost?

Both start free. IntervalCoach is free with in-app purchases: Pro is $2.99 per month or $24.99 per year, and Max is $6.99 per month or $69.99 per year. PEAKVO2 gives you three full workouts free, then unlocks its whole library for $0.99 per month, $9.99 per year, or $19.99 for lifetime. PEAKVO2 is the cheaper option for guided VO2 max training; IntervalCoach costs more because it does full adaptive coaching.

PEAKVO2 vs IntervalCoach: Plan the Training or Run It?

By Cristian Serb · Updated August 17, 2026

Cyclists training outdoors on a road, the kind of endurance athlete these apps serve

Run these workouts on your iPhone, or hands-free on Apple Watch. Get PEAKVO2

IntervalCoach and PEAKVO2 sit at different points in your training. IntervalCoach is an AI coach that decides what you should do, reading recovery signals like HRV and sleep to reshape a periodized plan each day. PEAKVO2 is the app that runs the session, guiding VO2 max interval protocols on your wrist. Pick IntervalCoach to plan and adapt your training; pick PEAKVO2 to actually run the intervals.

This is not a head-to-head between two apps doing the same thing. IntervalCoach is a planner and coach; PEAKVO2 is an execution tool for the workouts themselves. Understanding that split is the whole decision.

PEAKVO2 vs IntervalCoach at a Glance

	PEAKVO2	IntervalCoach
Primary job	Run guided VO2 max sessions	Plan and adapt your training with AI
What it decides	The timing and phases inside a workout	What workout to do today, from recovery data
Recovery and readiness	Not the focus	Yes, HRV, sleep, load, readiness scoring
Periodization and multi-sport	VO2 max interval focus	Yes, cycling, running, swimming, strength
Guided in-session running	Full-screen phases, haptics, HR zones on the wrist	Schedules to Apple Watch Workouts, not the focus
Named VO2 max protocols	Norwegian 4x4, Tabata, HIIT 30/30, and more	AI-generated sessions
Field tests	Built-in beep and Cooper tests	Not mentioned
External account	None required	Syncs with Intervals.icu
Price	3 workouts free, then $0.99/mo, $9.99/yr, $19.99 lifetime	Free, then $2.99/$6.99 per month or $24.99/$69.99 per year

What IntervalCoach Is

IntervalCoach is an AI training coach for cyclists, runners, triathletes, and swimmers. Every morning it reads more than 60 recovery signals, HRV, sleep, sleep debt, training load, and subjective wellness, scores your readiness, and reshapes the day's session before you start. It builds plans using periodization models grounded in sport science, works across multiple sports and strength, adds a conversational AI coach, goal-event countdowns, activity analytics with power zones, and weekly and monthly reports, and it syncs with Intervals.icu. Its Apple Watch app surfaces readiness and today's workout through complications. Its strength is the thinking: it decides what you should train and adapts as your body changes.

What PEAKVO2 Is

PEAKVO2 is an interval training app for iPhone and Apple Watch, built around running VO2 max sessions well. It ships eight validated protocols, the Norwegian 4x4, Tabata, HIIT 30/30, Billat 30/30, Ronnestad 30/15, VO2 Max 3x3, VO2 Max 5x3, and Tempo Run, with full-screen color-coded phases, automatic transitions, a haptic tap at each switch, and the heart rate zones each protocol depends on. It runs natively on Apple Watch with no phone needed, works with no external account, tracks your VO2 max trend over time, and includes built-in beep and Cooper field tests. It is a training app, not a testing service. Its strength is the doing: when it is time to hit the intervals, it runs the session on your wrist.

The Core Difference: The Coach vs the Session

IntervalCoach answers "what should I do today, given how I am recovering?" PEAKVO2 answers "run this VO2 max session cleanly on my wrist." Those are different problems, and each app is built for its own.

An AI planner like IntervalCoach is powerful if you want your whole program managed, adapted to recovery, and periodized across sports, and it does that far beyond what a single-purpose trainer offers. But when the plan says "do a VO2 max interval session," you still have to run it, and a coaching app that schedules to the generic Workouts app is not built to guide each 4-minute effort and recovery on your wrist the way a dedicated interval app is. PEAKVO2 is that dedicated runner, with the named protocols and the phase-by-phase guidance, plus field tests to measure the result. It does not plan your season; it runs the hard part properly.

Who Each One Is For

Choose IntervalCoach if you want an AI to build and adapt a full endurance program around your recovery and periodization, you train multiple sports, and you already use Intervals.icu. It is a coach, not just a timer.
Choose PEAKVO2 if you want to run VO2 max interval sessions guided on your wrist, with proven protocols and built-in beep and Cooper tests, and you would rather not manage a whole training platform. It is self-contained and focused.
Use both if you want IntervalCoach to decide the plan and PEAKVO2 to run the VO2 max intervals. The planner and the session tool complement each other.

Build your aerobic engine with PEAKVO2

Guided VO2 max protocols, the Norwegian 4x4, Tabata, REHIT, and more, on iPhone and Apple Watch, with heart rate zones, built-in beep and Cooper tests, and your VO2 max tracked over time. Three workouts free.

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Cristian Serb

I'm the developer of PEAKVO2. I built it because I was doing the Norwegian 4x4 myself and wanted the timing handled on my wrist so I could just train. I took my own VO2 max from about 41 to 51 with it. PEAKVO2 on the App Store.