License

Plain A11y is free and open source. You may use, copy, modify and distribute it under the terms of the MIT License below, as long as the copyright notice and this permission notice are kept.

MIT License

MIT License

Copyright (c) 2026 Konstantin Beregovoy

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.

Third-party software

The extension package includes the following software, unchanged:

axe-core 4.14.0, copyright Deque Systems, Inc., under the Mozilla Public License 2.0. The MPL-2.0 covers the axe-core files only, not the rest of Plain A11y. The source code of axe-core is available at the address above.
React 19.3.1, React DOM 19.3.1 and Scheduler 0.28.0, copyright Meta Platforms, Inc. and affiliates, under the MIT License.

The full notices are shipped inside the extension package, in the files LICENSE, THIRD_PARTY_NOTICES.md and licenses/axe-core-MPL-2.0.txt.

License

MIT License

Third-party software

Fonts of this website