Licences and attribution
Open-source software, typefaces and sample content used by this service, and their licences.
Measurement engine: OpenTakeoff (Apache-2.0)
OpenTakeoff is used at a pinned revision under the Apache License 2.0. Its licence and NOTICE are reproduced below, and files we modified are marked as changed.
Pinned revision: 84c7f48e458f6cd74f694e3a970dd011c73a8f2e (apache-2.0-final)
This hosted service is separate from the OpenTakeoff project. The access approval covers this hosted application only; OpenTakeoff itself is available from its own repository under its own licence.
- Licence text — Apache License 2.0, as published at the pinned revision
- NOTICE file
- Source repository (external link)
NOTICE
LineTakeoff
Copyright 2026 the LineTakeoff owner (legal name to be supplied by the owner)
This product includes software from OpenTakeoff
(https://github.com/kentucky-ai/opentakeoff, commit 84c7f48e458f6cd74f694e3a970dd011c73a8f2e,
tag apache-2.0-final), licensed under the Apache License, Version 2.0:
OpenTakeoff
Copyright 2026 Kentucky AI and the OpenTakeoff contributors
jsts 2.12.1 is used under the Eclipse Distribution License 1.0 (EDL-1.0).
The OpenTakeoff files in this product are unmodified copies of the pinned revision; this service’s own code wraps them. A file that is ever modified will carry a change notice and be listed here.
Modified OpenTakeoff files: none.
jsts 2.12.1, used by server-side measurement components, is offered under EDL-1.0 or EPL-1.0; this service elects the Eclipse Distribution License 1.0. Eclipse Distribution License 1.0 (external link)
Typefaces
- Archivo — SIL Open Font License 1.1
- IBM Plex Sans Hebrew — SIL Open Font License 1.1
- IBM Plex Mono — SIL Open Font License 1.1
Self-hosted, unmodified and not subset. “Plex” is a Reserved Font Name.
Other open-source components and their licences
PDF rendering: PDF.js (Apache-2.0)
The web pages also include these open-source libraries, each under its own licence:
| React, React DOM, scheduler, use-sync-external-store | MIT |
|---|---|
| React Router | MIT |
| React Aria Components, React Aria, React Stately, @internationalized | Apache-2.0 |
| intl-messageformat | BSD-3-Clause |
| @formatjs message parser | MIT |
| Firebase JavaScript SDK (sign-in pages) | Apache-2.0 |
| Zod | MIT |
| clsx | MIT |
| idb | ISC |
Third-party licences in this build
The sample drawings and their data are synthetic, created for this service. They show no real building, address or client.