Musculoskeletal forces from smartphone video
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See example sports session
See example rehab session
Latest updates
11
/
22
:
Webinar (tutorial) on Youtube
11
/
22
:
Webinar (research) on Youtube
11
/
22
:
Dynamics scripts released
11
/
22
:
Analysis scripts released
11
/
22
:
Source code open source
OpenCap is an open source software developed at Stanford University
View our manuscript.
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Kinematics are automatically computed in the cloud now (source code here), and utilities for computing forces are available here.
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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
Walking
Sit-to-stand
Squats
Drop jumps
Treadmill Running
Jumping

Key features

01
Low-cost and easy to use
  • No specialized hardware, software, or expertise required.
  • Only need 2 iOS devices.
  • Automated cloud computing.
02
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.
03
Fast and portable
  • Setup in 5 minutes.
  • Collect data anywhere with internet.
  • Compute kinematics in minutes.
04
Secure
  • 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.

Start collecting data

Get Started
Collect data in minutes
Best practices
Tips for a smooth data collection
Troubleshooting
Frequently asked questions
Start recording

Want to learn more?

Team

Scott Uhlrich
Scott Uhlrich
,
PhD

Research Engineer at Stanford University

Antoine Falisse
Antoine Falisse
,
PhD

Postdoctoral Fellow at Stanford University

Łukasz Kidziński
Łukasz Kidziński
,
PhD

Research Engineer at Stanford University

Jennifer Hicks
Jennifer Hicks
,
PhD

Research Engineer at Stanford University

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Scott Delp
Scott Delp
,
PhD

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

info

Contact

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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OpenCap is developed at Stanford University in the Neuromuscular Biomechanics Laboratory under the supervision of Prof. Scott Delp. The project is supported by the Wu Tsai Human Performance Alliance at Stanford University, the Mobilize Center, a Biomedical Technology Resource Center funded by the National Institutes of Health under Grand P41EB027060, and the Restore Center, a Medical Rehabilitation Research Resource Center funded by the National Institutes of Health through Grant P2CHD10191301.
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