4x4
Love how focused this app is compared to others in the niche. Highly recommend trying it out!
Free
In-App Purchases
About
This app guides you through high-intensity interval training sessions designed to improve your VO2 max. It offers live heart-rate feedback and timing for your workouts, with options for both free and premium training plans.
✓Norwegian 4x4 interval workouts
✓Live heart-rate guidance
✓Apple Watch integration
✓Multiple training equipment options
✓Workout performance review
✓VO2 max estimate tracking
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What's New in Ramp4x4
2.4
October 3, 2026
New in 2.4: • Choose your training goal, preview a 4x4 session without recording a workout, and set an optional reminder to get started. • More reliable Apple Watch workouts, with improved timing, reconnection, and completed workout summaries on iPhone. • Saved workouts open a fuller summary with total duration, available heart-rate metrics, and interval details. • Voice cues respond when you turn them on during an active workout. • Eligible athletes can review an updated max-heart-rate estimate from Home. Your target range changes only if you choose to update it. • Improved readability on smaller Apple Watches and more dependable heart-rate source handling. Keep training with guided intervals, live zone feedback, and the 8-week plan.
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Subscriptions & In-App Purchases
Ramp4x4+ Monthly
Full history, VO2 trends & custom interval presets.
$9.991 Month
User reviews
FAQ
What is Ramp4x4?
Ramp4x4 is a VO2 max training app that guides you through Norwegian 4x4 interval workouts. It provides live heart-rate guidance and timing, with options for both free and premium training plans.
Does Ramp4x4 have ads?
No, Ramp4x4 is ad-free. The app offers a free tier with unlimited classic workouts and a premium subscription for advanced features.
What devices does Ramp4x4 support?
Ramp4x4 is available on iPhone and Apple Watch. Heart-rate features require a compatible heart-rate monitor, earbuds, or the timer-only option.
How does Ramp4x4 track VO2 max?
Ramp4x4 displays your latest available VO2 max estimate from Apple Health. It does not directly measure VO2 max, and indoor workouts may not generate Apple Watch Cardio Fitness estimates.
What are the subscription options for Ramp4x4?
Ramp4x4 offers a Premium subscription with a 7-day free trial. Options include Ramp4x4+ Monthly for $9.99 and Ramp4x4+ Yearly for $59.99.
Can I use Ramp4x4 for different types of workouts?
Yes, you can use Ramp4x4 for outdoor runs or indoor training on treadmills, bikes, rowers, ellipticals, stair climbers, or SkiErgs. The app prepares your warmup, intervals, recoveries, and cooldown with one tap.
What is the age rating for Ramp4x4?
Ramp4x4 has an age rating of 4+. The app is intended for general fitness and wellness and is not medical advice.
How often is Ramp4x4 updated?
The latest version of Ramp4x4 is 2.4, which was last updated on October 3, 2026. This indicates a relatively active development cycle.
