Norwegian 4x4 Protocol vs Reptrackr
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Norwegian 4x4 Protocol
This app guides you through the effective Norwegian 4x4 interval training method to boost cardiovascular performance and endurance. It features a precision timer, heart rate zone tracking, and progress monitoring for scientifically proven results.
- Precision 4min work / 3min rest cycles
- Heart rate zone tracking (90-95% max HR)
- VO2 Max improvement tracking
- Multiple HIIT workout protocols
- Progress monitoring
- Universal cardio training support
- Offline functionality
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Norwegian 4x4 HIIT Timer — Interval Training & VO2 Max BOOST VO2 MAX WITH NORWEGIAN 4X4 PROTOCOL WORKOUTS Train smarter with the Norwegian 4x4 protocol, one of the most studied HIIT methods for improving cardiovascular performance and endurance. A precise, distraction-free timer guides every interval so you can focus on the effort. KEY FEATURES: - Norwegian 4x4 Timer - Precision 4min work / 3min rest cycles - Heart Rate Training - Track 90-95% max HR zones - VO2 Max Improvement - Scientifically proven results - HIIT Interval Timer - Multiple workout protocols - Progress Tracking - Monitor your fitness transformation - Universal Training - Running, cycling, rowing, any cardio, you name it - Offline Ready - No internet required during workouts - Haptics Feedback and Vibrations - Countdown before the start - Customizable Warmup session length - Customizable Cooldown session length WHAT IS NORWEGIAN 4 BY 4 TRAINING? The Norwegian 4x4 protocol is a revolutionary HIIT method featuring: - 4 intervals of 4 minutes at 90-95% max heart rate - 3 minutes active recovery between intervals - Proven results: Increase VO2 max by up to 10% in 8 weeks - Elite approved: Used by professional athletes worldwide WHY CHOOSE NORWEGIAN 4X4 INTERVAL TRAINING? - PROVEN RESULTS: Sports science research shows significant cardiovascular improvements - BEGINNER FRIENDLY: Complete guide for Norwegian 4x4 workout beginners - CUSTOMIZABLE: Adapt the Norwegian 4 x 4 protocol to your fitness level - COMPREHENSIVE: Includes warm-up, cool-down, and recovery protocols - VALIDATED: Mention in Tim Ferriss' Blog PERFECT FOR: - Athletes seeking performance gains with Norwegian 4x4 workouts - Fitness enthusiasts wanting efficient HIIT interval training - Anyone improving cardiovascular health through proven protocols - Runners, cyclists, rowers using Norwegian 4x4 interval training HOW OFTEN NORWEGIAN 4X4? - Our app includes guidance on optimal training frequency and recovery for maximum VO2 max gains. START YOUR NORWEGIAN 4X4 TRANSFORMATION Join thousands who have revolutionised their fitness with the Norwegian 4x4 protocol training. Download the ultimate Norwegian 4x4 workout app now! Download today and start training with the Norwegian 4x4.
Reptrackr
This app helps lacrosse players improve their skills with performance tracking tools. It offers a structured approach to training for real results on the field.
- Performance tracking tools
- Skill improvement focus
- Structured training approach
- Designed for lacrosse players
- Real results oriented
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Train like a pro with Reptrackr, the performance tool designed specifically for lacrosse players who want real results. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://app.myreptrackr.com/privacy
Screenshots
Verdict
Norwegian 4x4 Protocol and Reptrackr both sit at 4.3 stars, but that hides the real split: 100% of Reptrackr's written reviews are positive against 25% of Norwegian 4x4 Protocol's. Reptrackr also leads on price (Free vs $5.99). Norwegian 4x4 Protocol's advantage is in-app purchases (none vs 2) and chart position (#195 vs unranked). On rating, update cadence, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Reptrackr is free to download; Norwegian 4x4 Protocol costs $5.99 up front. Reptrackr sells 2 in-app purchases, starting at $4.99 per month. Norwegian 4x4 Protocol asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.3 for Norwegian 4x4 Protocol against 4.4 for Reptrackr. That said, the two scores are not equally well evidenced: Norwegian 4x4 Protocol has 55 ratings behind it against 9, so its average is the more settled of the two. Written reviews are what separate them: 25% of Norwegian 4x4 Protocol's written reviews are positive against 100% of Reptrackr's.
Norwegian 4x4 Protocol ships an update every 3 weeks, Reptrackr every 2 weeks. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.
| Parameter | Norwegian 4x4 Protocol | Reptrackr |
|---|---|---|
| Price | $5.99 | Free — better |
| Rating | 4.3 (55 ratings) | 4.4 (9 ratings) — better |
| Positive reviews | 25.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 55 — better | 9 |
| Update frequency | Every 3 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Freemium — better |
| Best chart rank | #195 — better | — |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Requires iOS | 17.6 | 17.6 |
| Further details — not scored | ||
| Size | 5 MB | 65 MB |
| Age rating | 4+ | 4+ |
| Developer | Nikita Yampolski | Peregrine Innovations LLC |
Customer experience
Norwegian 4x4 Protocol
Reptrackr
In-app purchases
Norwegian 4x4 Protocol
No in-app purchases
Reptrackr
- Monthly Pro7 Days trial$4.991 Month
- Coach Lifetime Membership$124.99
