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
3.0
October 27, 2026
Meet the redesigned Ramp4x4. - Bring your lab results into your training. Manually record VO₂ test results, tested maximum heart rate and prescribed heart-rate targets. - A cleaner Today screen brings your next workout, recent sessions and cardio fitness together. - A redesigned 8-week plan makes your next session and training progress easier to follow with Ramp4x4+. - Clearer iPhone and Apple Watch workout layouts put the interval countdown, heart rate and target status first. - Refreshed workout summaries and detailed interval views help you review your effort, time in target and recovery. - An updated Progress view brings workout history and available Apple Health Cardio Fitness trends into one place. - Clearer Cardio Fitness source and date information keeps Apple Health estimates separate from workout performance. Classic Norwegian 4x4 workouts remain free. Apple Watch is optional.
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Subscriptions & In-App Purchases
Ramp4x4+ Yearly
Full history, VO2 trends & custom interval presets.
$59.991 Year
Price Updates
October 28, 2026→$59.99
August 22, 2026→$59.99
June 10, 2026→$49.99
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.
