Open-Source Licences

Our apps are built on work by other people. CubeXpert in particular would not exist without the projects below, and their licences continue to apply to their code. The notices are reproduced here in full.

These notices also ship inside the app itself, under Settings → About → Acknowledgements, so they remain available offline and travel with every copy of the software. This page is a public mirror of them, not the only copy.

1. rubiks-vision — MIT Licence

CubeXpert's two-shot camera scanner — the pose and geometry work, detector decoding, the PnP solver and deskew — is a Dart port of rubiks-vision by Gillis Oldfeldt. The bundled cube-pose model is taken from it unmodified, and the colour-embedding model derives from the same trained network, so both remain under its MIT licence.

MIT License Copyright (c) 2026 Gillis Oldfeldt 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.

2. Cube-Solver (CFOP) — BSD 3-Clause Licence

The CFOP solving plan is built on d4m4s74/Cube-Solver. Its licence requires that the copyright notice, the conditions and the disclaimer be reproduced with any binary distribution, so they appear here in full and unaltered.

Rubik's Cube Solver Library for C https://github.com/d4m4s74/Cube-Solver Created as my CS50 final project Copyright (c) 2021 All rights reserved BSD 3-Clause License http://www.opensource.org/licenses/BSD-3-Clause Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * 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. * Neither the name of CS50 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.

3. Beginner solver

The Beginner (layer-by-layer) solving plan is based on work by Hakan Gezginci (github.com/Anixton), which follows the officially published beginner solution for the cube. No licence file accompanies the upstream work, so this is an attribution notice rather than a grant.

4. ckociemba

The Kociemba solving plan uses ckociemba, a C implementation of Herbert Kociemba's two-phase algorithm. As above, no licence file accompanies the upstream source, so this is an attribution notice.

5. Frameworks and SDKs

Our apps are also built with the following, each under its own licence:

  • Flutter and the Dart packages listed in the app's own licence screen (BSD 3-Clause and others).
  • ONNX Runtime — runs the scanner's models on-device (MIT).
  • OpenCV, via dartcv4 — image processing for the scanner (Apache 2.0).
  • Google Mobile Ads SDK — advertising in the free version of CubeXpert.

The complete, per-package licence text for every Dart and native dependency is listed in the app under Settings → About → Acknowledgements.

If you believe something in our apps is used without proper attribution, please tell us and we will correct it: admin@visionflutter.com. See also our Terms of Service.