LiftSight combines on-device pose detection with AI coaching to give you biomechanically-grounded feedback on every rep. Measure joint angles, detect lift phases, and get actionable cues to lift safer and stronger.
From recording to coaching, LiftSight handles the entire pipeline on your iPhone.
Film your set directly in-app or import any video from your library. LiftSight automatically extracts key frames at configurable intervals.
Apple Vision framework detects 15 body joints entirely on your device. No data leaves your phone for pose estimation — private by design.
Exact degree measurements at every joint, color-coded green/yellow/red against research-backed ideal ranges for each lift phase.
See where your joints should be. A cyan "ghost" skeleton shows ideal form overlaid on your actual position so you can visualize the correction.
Get structured analysis: what you're doing well, what to fix (prioritized by injury risk), and specific coaching cues to improve your next set.
Every analysis is saved with lift type, timestamp, and AI model used. Revisit past sessions, track your progress, and share results.
LiftSight's pipeline takes you from video to coaching in under a minute.
Record or import your lift video. LiftSight extracts frames and lays them out in a visual grid. Select the key positions you want analyzed — setup, bottom of the squat, lockout, whatever matters most.
On-device pose detection runs automatically, measuring joint angles and detecting your lift phase. Toggle the skeleton overlay to see a color-coded breakdown of every angle, with a ghost skeleton showing ideal positioning.
Your selected frames and angle data are sent to AI. You get back a structured coaching report: overall assessment, what's working, what to fix, and actionable cues you can apply on your next set.
Lift-specific angle standards grounded in NSCA guidelines, Starting Strength, and peer-reviewed biomechanics research.
Knee/hip angles, depth check, valgus collapse, forward lean, butt wink detection
Hip hinge angle, bar path, back position, lockout, hips-rising-too-fast detection
Elbow angle, bar path, arch quality, scapular retraction, touch-and-go vs. pause
Strict vs. push press detection, head position, lockout alignment, elbow path
Torso angle consistency, elbow path, lat engagement, full range of motion check
Generic mode measures all major joints for any movement not in the preset list
Pose detection runs entirely on-device using Apple's Neural Engine. Only compressed frames are sent to the AI for coaching — and only when you tap Analyze.
LiftSight uses state-of-the-art language models to deliver coaching feedback that understands the nuance of each lift.
Angle ranges are sourced from NSCA guidelines, Rippetoe's Starting Strength, and Schoenfeld's biomechanics research. Phase-aware targets adapt to each stage of the lift.
Pure Swift with zero third-party dependencies. All networking via URLSession, all detection via Vision framework. Small app, fast performance.