License
The Tarn UI license
The short version first, then the terms that apply.
Last updated 2026-11-08
In plain English
| You can | You can’t |
|---|---|
| Build unlimited apps with Tarn UI — your own, your employer’s or your clients’ — free or paid. | Sell, share or give away the kit itself, or a modified copy, as a UI kit, template, starter or library. |
| Modify every file to fit your product. | Put the kit’s source in a public repository or anywhere it can be downloaded and reused. |
| Keep using every version you downloaded, forever. | Let more developers work with the source than you have seats. |
1. Grant
When you buy a Tarn UI package you receive a non-exclusive, non-transferable, perpetual, worldwide license to use, copy and modify the Tarn UI source code (the “Kit”) to create software applications (“End Products”), subject to these terms.
2. Seats
Each seat licenses one named developer to access and work with the Kit’s source. A team needs one seat per developer who does so at the same time. Seats from separate purchases add up. A seat may be reassigned when a developer leaves the project, but not shared or rotated to cover more people.
3. Updates window
Your package includes the releases of the Kit published during the updates window you chose (3, 6 or 12 months from the purchase date). You may use any release you obtained within the window under this license with no time limit. Releases published after the window are not licensed to you unless you buy a new package.
4. End Products
- You may distribute End Products in compiled or source form, commercially or for free, without limit on number, users or installs.
- An End Product must add substantial functionality of its own. It must not be, or mainly consist of, the Kit or its components.
- If you ship an End Product’s source (including open source), the Kit’s files must not be readily separable and reusable as a UI kit. Keep the Kit out of public repositories; reference it as a private dependency instead.
- You may build End Products for clients. The client may use and maintain the End Product, but needs its own seat to develop with the Kit beyond that.
5. Restrictions
You may not resell, sublicense, redistribute or share the Kit, in original or modified form, on its own or as part of another UI kit, design system, template, theme, code generator or starter project, or make it available for others to download.
6. Fonts
The bundled IBM Plex Sans and IBM Plex Mono fonts are licensed separately under the SIL Open Font License 1.1, included as fonts/OFL.txt. That license, not this one, governs the fonts.
7. Warranty and liability
The Kit is provided “as is”, without warranty of any kind. To the maximum extent permitted by law, the author is not liable for any damages arising from its use. Nothing in this license limits rights you have under consumer law that cannot be waived.
8. Termination
This license ends automatically if you breach it. End Products you distributed before the breach may remain in use by their end users.
Questions
Not sure whether your use is covered? Ask before you buy, through a reply to your Gumroad receipt.