Terms of use

Last updated 2026-07-19.

Downloading Knurl gives you a personal, non-transferable license to install and run it on your own devices. The free tier is yours to use as is; the one-time lifetime unlock is a single purchase, tied to your Apple account, that removes the tier's limits for as long as you use the app, with no recurring charge. You may not resell, redistribute, or reverse engineer the app.

Knurl is provided as is, without warranty of any kind. We work hard to keep it accurate and reliable, but we are not liable for damages arising from its use, including any effect on your racing session, hardware, or data.

Works with Gran Turismo 7 on PS5 and PS4 over your home network. Knurl is an independent product, not affiliated with, endorsed by, or sponsored by the console manufacturer or the game's publisher.

Questions about these terms? Write to support@sigilark.com.