01
One-tap setup
All nine phases built for you, with target zones calculated from your own max heart rate.
Archline Labsbuilds small, focused software.
An independent studio working across fitness, entertainment, and logistics. Our flagship is Ramp4x4 — a free Norwegian 4×4 VO2 max trainer for iPhone and Apple Watch.
- Free to download
- iPhone + Apple Watch
- Syncs to Apple Health
- No account required
01 / Flagship
Ramp4x4 — the Norwegian 4×4, done properly
The protocol is simple on paper and awkward in practice: a 10-minute warmup, four 4-minute hard intervals at 85–95% max heart rate, 3-minute recoveries, and a cooldown. Ramp4x4 turns the whole sequence into one tap, then coaches you through every phase.
02
Live zone coaching
Your heart rate against the target zone on your wrist, so you can pace each interval instead of guessing.
03
Haptics and voice
A wrist tap and a spoken cue at every phase change — no staring at a screen mid-effort.
04
Summary that counts
Time in the VO2 zone, intervals completed, and your heart-rate curve across the whole session.
Inside the app
Train, understand, adjust
Three views of the same workout — guided effort, a clear result, and live zone feedback on your wrist.
Swipe to explore
The complete Norwegian 4×4 guide App facts Compare options Support
02 / From the studio
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03 / Contact
Talk to a human.
App support, privacy questions, and business inquiries all reach the same inbox.
Ramp4x4 help and FAQs: Ramp4x4 Support