OpenCap is an open source software developed at Stanford University
View our manuscript.

Kinematics are automatically computed in the cloud now (source code here), and utilities for computing forces are available here.
opencap video

How it works

Step 01
Get OpenCap's iOS app

Our iOS app allows you to collect synchronous videos on iPods, iPhones, and iPads.

Step 02
Use OpenCap's secure web app to collect data

Our web app allows you to record videos and visualize motion data.

Step 03
Leverage OpenCap's cloud servers to compute motion and forces

Our algorithms automatically compute skeletal motion and musculoskeletal forces.

Step 04
Use OpenCap's utilities to process data

Our utilities allow you to post-process and visualize your data.

Example applications
Drop jumps
Treadmill Running

Key features

Low-cost and easy to use
  • No specialized hardware, software, or expertise required.
  • Only need 2 iOS devices.
  • Automated cloud computing.
Accurate motion and forces
  • Skeletal motion from a constrained biomechanical model.
  • Musculoskeletal forces from dynamic simulation.
  • Validated against marker-based motion capture and force plates.
Fast and portable
  • Setup in 5 minutes.
  • Collect data anywhere with internet.
  • Compute kinematics in minutes.
  • Compliant with Stanford University High Risk Data Cloud computing requirements.
  • All data are encrypted in transit and at rest.
  • Leverages AWS HIPAA compliant cloud computing.

Want to learn more?


Scott Uhlrich
Scott Uhlrich

Research Engineer at Stanford University

Antoine Falisse
Antoine Falisse

Postdoctoral Fellow at Stanford University

Łukasz Kidziński
Łukasz Kidziński

Research Engineer at Stanford University

Jennifer Hicks
Jennifer Hicks

Research Engineer at Stanford University

Scott Delp
Scott Delp

Professor of bioengineering, mechanical engineering, and orthopaedic surgery at Stanford University



For technical questions, please use our forum.

Please consult our FAQ before asking questions.

There is NO need for verification code when installing the iOS web app, please visit Get Started and follow the two-step process.

We do NOT support Android, consult our FAQ to learn more.

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