Acknowledgements

Last updated: 10 July 2026

Zeus Enhance runs entirely on your iPhone using the on-device models below. We gratefully acknowledge their authors and reproduce the required attributions and license notices.

BSD 3-Clause License

Copyright (c) 2021, Xintao Wang
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

MIT License

Copyright (c) 2019 Kim Seonghyeon (stylegan2-pytorch)

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

Apache License 2.0

Applies to BasicSR, GFPGAN, Depth Anything V2 Small, and DINOv2.

Licensed under the Apache License, Version 2.0 (the "License"); you may not
use these files 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.

GFPGAN — Other dependencies and licenses

GFPGAN © 2021 THL A29 Limited, a Tencent company, is licensed under the Apache License 2.0 except for the third-party components below, whose notices are reproduced from the upstream GFPGAN LICENSE file.

BasicSR ............ Apache License 2.0
StyleGAN2 .......... NVIDIA License (modified from stylegan2-pytorch,
                     MIT License, © 2019 Kim Seonghyeon)
DFDNet ............. CC BY-NC-SA 4.0
torch, torchvision . BSD 3-Clause License
NumPy .............. BSD 3-Clause License
facexlib ........... MIT License
opencv-python ...... MIT License
tqdm ............... MIT License / Mozilla Public License 2.0

Components flagged non-commercial (e.g. DFDNet) are not included in the model shipped in this app: GFPGAN v1.4 uses the clean StyleGAN2 architecture (via BasicSR), and face detection uses Apple's Vision framework.

Trademarks and model names belong to their respective owners. Their inclusion does not imply endorsement.