Principle vs UXPin

Principle has no write-up on Specifiction yet; its figures are above.

UXPin is a design and prototyping platform for creating interactive prototypes with states, logic, conditional flows, variables, and dynamic content. It runs on the web and has UXPin apps for Mac and Windows, plus Mirror apps for iOS and Android. Core includes conditional logic, variables, and expressions, along with built-in coded libraries such as MUI, Tailwind UI, and Ant Design. Teams can share prototypes with unlimited viewers and commenters, and use public or team comments. Integrations include Slack, FullStory, Jira, Storybook, and Git, with a Figma plugin and Sketch import also listed. The Free plan allows two prototypes and 50 AI credits. Core costs $49 a month per seat when billed monthly, or $29 a month per seat billed yearly; Growth costs $69 a month per seat, or $40 a month per seat billed yearly. Core includes 200 monthly AI credits and seven-day version history, while Growth includes 500 monthly credits, 30-day history, roles and permissions, SSO, and 2FA. A 14-day trial is available.