PEAKVO2 vs Intervals Pro: Which Interval App Should You Get?
Run these workouts on your iPhone, or hands-free on Apple Watch. Get PEAKVO2 PEAKVO2 and Intervals Pro are both interval apps for iPhone and Apple Watch, but they solve different problems. PEAKVO2 ships eight ready-made VO2 max protocols like the Norwegian 4x4 and tracks your VO2 max over time. Intervals Pro is a customizable timer you build yourself, for any activity from HIIT to yoga. Pick PEAKVO2 for guided VO2 max training; pick Intervals Pro for a flexible build-your-own timer.
Both are well-made, Apple Watch capable interval apps, so this is not about which is better overall. It is about whether you want proven endurance protocols handed to you or a flexible timer you configure yourself.
PEAKVO2 vs Intervals Pro at a Glance
| PEAKVO2 | Intervals Pro | |
|---|---|---|
| Primary purpose | VO2 max interval training | Customizable timer for any activity |
| What you run | Eight ready-made endurance protocols | Timers you build yourself |
| Named VO2 max protocols | Norwegian 4x4, Tabata, HIIT 30/30, and more, built in | Not advertised; build your own |
| VO2 max tracking | Yes, trend over time | Not the focus |
| Heart rate | Zones tied to each protocol | Optional target range per interval |
| Apple Watch | Standalone, no phone needed | Standalone, no phone needed |
| Best for | Runners and endurance athletes raising VO2 max | Anyone timing many kinds of intervals |
| Platform | iPhone and Apple Watch | iPhone and Apple Watch |
| Price | 3 workouts free, then $0.99/mo, $9.99/yr, $19.99 lifetime | Free, then $2.99/mo, $19.99/yr, $69.99 lifetime |
What PEAKVO2 Is
PEAKVO2 is an interval training app for iPhone and Apple Watch, built around VO2 max. It ships eight validated endurance 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 those protocols depend on. It runs natively on Apple Watch with no phone needed, 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. The point is that you do not design the workout: you pick a proven protocol and it runs.
What Intervals Pro Is
Intervals Pro is a highly customizable interval timer for iPhone and Apple Watch. You build your own timers, naming each interval and setting its duration, alert, and color, for whatever you are training: HIIT, interval running, circuit training, yoga, boxing, stretching, and more. It runs standalone on Apple Watch, supports heart rate through the watch or a Bluetooth monitor, and can set a target heart rate range and running pace for each interval. It adds spoken and haptic cues, iCloud timer sharing, Siri Shortcuts, and Strava and Apple Health integration. Its strength is flexibility: one timer for many activities.
The Core Difference: Ready-Made vs Build-Your-Own
The split is simple. PEAKVO2 decides the workout for you and optimizes it for one goal, raising VO2 max, then tracks that number over time. Intervals Pro gives you a blank timer and lets you build anything, but the protocol design and heart rate targets are on you.
If you already know exactly what intervals you want and you train several different activities, that flexibility is the feature. If you want the fastest proven route to a higher VO2 max without designing sessions yourself, ready-made protocols and a VO2 trend are the feature. You could rebuild the Norwegian 4x4 by hand in Intervals Pro, but you would be recreating what PEAKVO2 ships on day one, without the VO2 max tracking around it.
Who Each One Is For
- Choose PEAKVO2 if your goal is your aerobic engine: structured VO2 max and endurance interval training, guided on your wrist, with the specific protocols and heart rate zones that raise VO2 max, and your VO2 max tracked over time. It fits runners, cyclists, and endurance athletes who want the timing and the science handled.
- Choose Intervals Pro if you want one flexible timer to build custom intervals across many activities, from running to yoga to boxing, and you do not need named VO2 max protocols or VO2 tracking. It fits people who like designing their own sessions.
- Price note: both start free. PEAKVO2's lifetime unlock is $19.99 against Intervals Pro's $69.99, so if you want to pay once, PEAKVO2 is the cheaper long-term option.
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, automatic phases, and your VO2 max tracked over time. Three workouts free.
Get PEAKVO2 free