LaChart
Lactate Testing for Athletes
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Free
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About
LaChart is a professional lactate testing and athlete performance tracking app designed for coaches and endurance athletes.
LACTATE TESTING
• Conduct step tests and record blood lactate values in real time
• Connect Bluetooth heart rate monitors for live HR tracking
• Automatic lactate curve calculation with LT1 and LT2 threshold detection
• Manual threshold override for custom coaching adjustments
TRAINING ZONES
• Automatic zone calculation based on lactate thresholds
• Support for cycling (power/watts), running (pace) and swimming
• Metric and imperial unit support
ATHLETE MANAGEMENT
• Manage multiple athletes from a single coach account
• Track progress across multiple tests over time
• Compare test results and monitor fitness development
REPORTS & SHARING
• Generate professional PDF reports for each test
• Send reports directly to athletes via email
• Visual lactate curve charts included in every report
DESIGNED FOR PROFESSIONALS
LaChart is built for sports scientists, coaches and serious athletes who need accurate, data-driven insights to optimize training load and performance.
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What's New in LaChart
1.0.9
September 8, 2026
Charts Short, fast intervals now fit the lap chart — a 20-second rep no longer runs off the top of the axis Lactate shows on the interval it was actually taken on, not the one next to it Interval widths follow the sport: time for rides, distance for runs and swims A measured interval is marked in red so you can find it at a glance Planner Opens on today, and you can scroll up into the weeks you have already trained Power Radar Finds recent rides and Garmin rides it used to miss, so the 30- and 90-day windows are no longer empty
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