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About Archline Labs

Archline Labs LLC is an independent software studio that builds small, focused products across fitness, entertainment, and logistics. Its flagship product is Ramp4x4, a free Norwegian 4x4 VO2 max training app available for iPhone and Apple Watch. The app guides users through the Norwegian 4x4 protocol, including warmup, hard intervals at 85–95% of max heart rate, recoveries, and a cooldown, with live zone coaching, haptics, and voice cues. It syncs with Apple Health, requires no account, and provides post-workout summaries of time in the VO2 zone and heart-rate data. The studio also lists other products, including a Discord-based collectible card experience called Live Glimbo.