Open-source licenses
The fonts and code Vellum ships under open licenses, with their license texts.
Vellum bundles the open-licensed fonts below with the app. Each font's license file is bundled with it, and the links open the exact text.
Text fonts
The ten families offered for text boxes and callouts (see Text properties). Exported PDFs embed the faces they use.
| Font | Use | Copyright | License |
|---|---|---|---|
| Arimo | Standard. Stands in for Arial and Helvetica; the default. | © 2020 The Arimo Project Authors | SIL Open Font License 1.1 (text) |
| Tinos | Standard. Stands in for Times New Roman. | © 2026 The Tinos Project Authors | SIL Open Font License 1.1 (text) |
| Cousine | Standard. Stands in for Courier. | © 2026 The Cousine Project Authors | SIL Open Font License 1.1 (text) |
| Archivo Narrow | Standard. Stands in for Arial Narrow. | © 2019 The Archivo Narrow Project Authors | SIL Open Font License 1.1 (text) |
| osifont | Drafting. ISO 3098 technical lettering (LGPL v3 build; no bold or italic). | Zefram Cochrane | GNU LGPL v3 with font exception (exception, LGPL 3.0, GPL 3.0) |
| Architects Daughter | Drafting. Hand-lettered architectural notes (no bold or italic). | © 2010 Kimberly Geswein | SIL Open Font License 1.1 (text) |
| Inter | General. Clean modern sans. | © 2017–2019 The Inter Project Authors | SIL Open Font License 1.1 (text) |
| Barlow | General. DIN-style face for sheet titles and stamps. | © 2017 The Barlow Project Authors | SIL Open Font License 1.1 (text) |
| IBM Plex Mono | General. Modern monospace. | © 2017 IBM Corp. | SIL Open Font License 1.1 (text) |
| Noto Sans | General. Multilingual text and symbols; draws any character another font lacks. | © 2022 The Noto Project Authors | SIL Open Font License 1.1 (text) |
Signature fonts
| Font | Use | Copyright | License |
|---|---|---|---|
| Allura | Typed signatures. | © 2010 The Allura Project Authors | SIL Open Font License 1.1 (text) |
| Dancing Script | Typed signatures. | © 2016 The Dancing Script Project Authors | SIL Open Font License 1.1 (text) |
| Homemade Apple | Typed signatures. | © 2010 Font Diner, Inc. | Apache License 2.0 (text) |
Code
| Project | Use | Copyright | License |
|---|---|---|---|
| OpenTakeoff | Hatch-line classification for room detection, adapted from classifyHatchSegs. | © 2026 Kentucky AI and the OpenTakeoff contributors | Apache License 2.0 |