AI-Powered Form Analysis for iOS

See your form the way a coach does.

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.

See How It Works Explore Features
Squat Bottom
82°
91°
72°
You Ideal
AI Coach
Good depth achieved
Bar path centered
Left knee caving in
Bracing looks solid
Joint Angles
R. Knee
91°
L. Knee
82°
Hip
72°

Everything you need to perfect your form.

From recording to coaching, LiftSight handles the entire pipeline on your iPhone.

Record or Import

Film your set directly in-app or import any video from your library. LiftSight automatically extracts key frames at configurable intervals.

On-Device Pose Detection

Apple Vision framework detects 15 body joints entirely on your device. No data leaves your phone for pose estimation — private by design.

Joint Angle Measurement

Exact degree measurements at every joint, color-coded green/yellow/red against research-backed ideal ranges for each lift phase.

Ghost Skeleton Overlay

See where your joints should be. A cyan "ghost" skeleton shows ideal form overlaid on your actual position so you can visualize the correction.

AI Coaching Feedback

Get structured analysis: what you're doing well, what to fix (prioritized by injury risk), and specific coaching cues to improve your next set.

Session History

Every analysis is saved with lift type, timestamp, and model used. Revisit past sessions, track your progress, and share results.

Three steps to better form.

LiftSight's pipeline takes you from video to coaching in under a minute.

1

Review

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, lockout, whatever matters most.

2

Study

On-device pose detection runs automatically, measuring joint angles and detecting your lift phase. Toggle the skeleton overlay to see a color-coded breakdown, with a ghost skeleton showing ideal positioning.

3

Coach

Your selected frames and angle data go 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.

Built for the lifts that matter.

Lift-specific angle standards grounded in NSCA guidelines, Starting Strength, and peer-reviewed biomechanics research.

Squat

Knee/hip angles, depth check, valgus collapse, forward lean, butt wink detection

Deadlift

Hip hinge angle, bar path, back position, lockout, hips-rising-too-fast detection

Bench Press

Elbow angle, bar path, arch quality, scapular retraction, touch-and-go vs. pause

Overhead Press

Strict vs. push press detection, head position, lockout alignment, elbow path

Row

Torso angle consistency, elbow path, lat engagement, full range of motion check

Any Exercise

Generic mode measures all major joints for any movement not in the preset list

Private by Design

Pose detection runs entirely on-device using Apple's Neural Engine. Only compressed frames leave your phone — and only when you tap Analyze.

Powered by Leading AI

LiftSight uses state-of-the-art language models to deliver coaching feedback that understands the nuance of strength training biomechanics.

Research-Backed Standards

Angle ranges sourced from NSCA guidelines, Rippetoe's Starting Strength, and Schoenfeld's biomechanics research. Phase-aware targets adapt to each stage of the lift.

Lightweight & Fast

Pure Swift with zero third-party dependencies. All networking via URLSession, all detection via Vision framework. Small app, fast performance.