Attributions

The word processor, spreadsheet and PDF editing in Umbra are built on GenOffice by Mainfunc, Inc., used under the Apache License, Version 2.0, and modified. A copy of the licence is available at apache.org/licenses/LICENSE-2.0.

The NOTICE distributed with GenOffice, reproduced as the licence requires:

GenOffice
Copyright 2026 Mainfunc, Inc.

This product includes software developed at Mainfunc, Inc.

Umbra’s document editing is built on BlockSuite and packages from AFFiNE (Toeverything), used under the MIT License. Copyright © Toeverything and the BlockSuite contributors.

One package, @blocksuite/bs-docs, is distributed under the Mozilla Public License 2.0; its source is available at github.com/toeverything/blocksuite.

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.

Umbra also depends on Electron, React, Zustand, Vite, TypeScript, CodeMirror, pdf-lib and many other open-source projects, each under its own licence — predominantly MIT, ISC, BSD and Apache-2.0. The full dependency tree with licences ships with the application and can be regenerated from the repository at any time.

If you believe something is used here without correct attribution, please write to hello@think-umbra.fyi and it will be corrected.