License for OpenSim 4.0 and Later

Last updated: Sept 15, 2021

License: OpenSim GUI

The OpenSim Graphical User Interface (GUI) is open-source under the Apache 2.0 license. Some dependencies have more restrictive licenses.

/* -------------------------------------------------------------------------- *
 * OpenSim                                                                    *
 * -------------------------------------------------------------------------- *
 * OpenSim is a toolkit for musculoskeletal modeling and simulation,          *
 * developed as an open source project by a worldwide community. Development  *
 * and support is coordinated from Stanford University, with funding from the *
 * U.S. NIH and DARPA. See http://opensim.stanford.edu and the README file    *
 * for more information including specific grant numbers.                     *
 *                                                                            *
 * Copyright (c) 2005-2018 Stanford University and the Authors                *
 *                                                                            *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may    *
 * not use this file except in compliance with the License. You may obtain a  *
 * copy of the License at http://www.apache.org/licenses/LICENSE-2.0          *
 *                                                                            *
 * Unless required by applicable law or agreed to in writing, software        *
 * distributed under the License is distributed on an "AS IS" BASIS,          *
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   *
 * See the License for the specific language governing permissions and        *
 * limitations under the License.                                             *
 * -------------------------------------------------------------------------- */

License: OpenSim API

The OpenSim Application Programming Interface (API) is fully open source and licensed under the Apache 2.0 license:

/* -------------------------------------------------------------------------- *
 *                                  OpenSim                                   *
 * -------------------------------------------------------------------------- *
 * The OpenSim API is a toolkit for musculoskeletal modeling and simulation.  *
 * See http://opensim.stanford.edu and the NOTICE file for more information.  *
 * OpenSim is developed at Stanford University and supported by the US        *
 * National Institutes of Health (U54 GM072970, R24 HD065690) and by DARPA    *
 * through the Warrior Web program.                                           *
 *                                                                            *
 * Copyright (c) 2005-2018 Stanford University and the Authors                *                                        
 *                                                                            *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may    *
 * not use this file except in compliance with the License. You may obtain a  *
 * copy of the License at http://www.apache.org/licenses/LICENSE-2.0.         *
 *                                                                            *
 * Unless required by applicable law or agreed to in writing, software        *
 * distributed under the License is distributed on an "AS IS" BASIS,          *
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   *
 * See the License for the specific language governing permissions and        *
 * limitations under the License.                                             *
 * -------------------------------------------------------------------------- */

License for Models, Examples, and Plug-Ins

Models, examples and plugins retain their own custom licenses. Refer to each individual file for information.

How to Acknowledge Us

Acknowledging the OpenSim project helps us and helps you. It allows us to track our impact, which is essential for securing funding to improve the software and provide support to our users (you).

Seth A, Hicks JL, Uchida TK, Habib A, Dembia CL, Dunne JJ, et al. (2018) OpenSim: Simulating musculoskeletal dynamics and neuromuscular control to study human and animal movement. PLoS Comput Biol 14(7): e1006223. https://doi.org/10.1371/journal.pcbi.1006223
Delp SL, Anderson FC, Arnold AS, Loan P, Habib A, John CT, Guendelman E, Thelen DG. OpenSim: Open-source Software to Create and Analyze Dynamic Simulations of Movement. IEEE Transactions on Biomedical Engineering. (2007)
For OpenSim Moco, please also cite: Dembia, C.L., Bianco, N.A., Falisse, A., Hicks, J.L., Delp, S.L. OpenSim Moco: Musculoskeletal optimal control. PLoS Computational Biology 16(12): e1008493.

We would also be grateful if you mention that OpenSim is funded by grants from the NIH including the Mobilize Center (P41EB027060) and Restore Center (P2CHD101913). We greatly appreciate this support, and the NIH appreciates knowing that their funds are having an impact, particularly on medical research and human health. If you use plugins, models, or other components contributed by your fellow researchers, you must acknowledge their work as described in the license that accompanies each of these files.

Additional Publications

For more publications about OpenSim see Theory and Publications

OpenSim is supported by the Mobilize Center , an NIH Biomedical Technology Resource Center (grant P41 EB027060); the Restore Center , an NIH-funded Medical Rehabilitation Research Resource Network Center (grant P2C HD101913); and the Wu Tsai Human Performance Alliance through the Joe and Clara Tsai Foundation. See the People page for a list of the many people who have contributed to the OpenSim project over the years. ©2010-2024 OpenSim. All rights reserved.