JaveLab

Record. Analyze. Improve. Track your javelin form, release angle, and progress — right on your iPhone.

JaveLab — your javelin throw, turned into data.

JaveLab is a personal training notebook for javelin throwers. Film a throw from the side, let Your iPhone analyzes your body, and puts the objective data right next to how the throw actually Felt — so you can see what's working and improve, day by day.

Everything runs on your device. No account, no sign-up, and your videos never leave your phone.

RECORD YOUR PRACTICE • Organize throws into daily sessions with location, weather, and condition notes • Import a slow-motion video for each throw, or replace it anytime • Add a distance, a 1–5 feel rating, and a free-text note

SEE YOUR FORM • On-device pose analysis tracks your wrist, elbow, shoulder, hips, and legs • Skeleton overlay and a wrist-motion trail drawn right on your video • Slow playback and frame-by-frame stepping to study the key moments

MEASURE WHAT MATTERS • Release angle, your way: mark the release segment on the wrist trail and read the angle of its average direction against the horizon • Or draw a line along the javelin on a snapshot to record its release angle • Wrist-height curve, peak elbow angle, and block-leg extension • Camera-aware: angles are measured against the true horizontal

TRACK YOUR PROGRESS • Compare two throws side by side and align them at release • Trends over time for your self-rating, distance, and release angle • Set a distance goal and keep a practice streak going

BUILT FOR THE FIELD • Works fully offline — perfect for the track and the practice ground • A built-in filming guide keeps your setup consistent for reliable comparisons • Available in English, 日本語, Deutsch, and हिन्दी

JaveLab doesn't tell you there's one "correct" throw. It puts your data and your feel side by side, and lets you find what makes your best throws yours.

JaveLab shows ads. Your training data stays on your device.