Beta terms of use.
Last updated 7 October 2026.
Engineering responsibility
Keystone is a tool for qualified engineers. Results, design checks, calculation sheets and AI assistant answers must be reviewed by the engineer responsible for the project, who remains responsible for the design. Each calculation sheet lists what is not checked.
Beta software
Keystone is in private beta and provided as is, without warranty. Features may change, and we may suspend or end the beta. Keep your own copies of models you care about.
Acceptable use
Use your own invite code; do not share it, resell access, attempt to bypass usage limits or misuse the AI assistant.
Your data
Your models remain yours. How data is handled is described in the privacy notice.
Trademarks
ETABS and SAP2000 are trademarks of Computers and Structures, Inc. Keystone is independent and not affiliated with CSI.