Cairn vs Synclet

Cairn is a macOS desktop app for mapping screens, data, roles, and CRUD operations before building a product. Users sketch low-fidelity pages, modals, and sheets, then connect them into scenarios with triggers and dependencies across roles. Cairn checks whether data used on a screen was created earlier in its causal flow and flags missing data. Its Fields and Journeys views show where data appears and how each role moves through a flow. The app works offline and saves projects as portable.cairn files on the user's Mac. The maker says Cairn has no accounts or telemetry and does not upload project files; it connects to the internet for update checks and Pro license validation. Cairn is positioned as a complement to Figma for later visual design. The free plan costs nothing and includes one project and up to two scenarios, but does not allow file import or export. Real-time collaboration is not available, and Cairn is not intended for pixel-perfect or high-fidelity design.

Synclet is a web service that turns natural-language product descriptions into visual prototypes. Users refine screens, flows, and design updates through chat while Synclet builds a structured specification covering users, surfaces, screens, and their relationships. Generated designs can span web, mobile, and tablet experiences, including role-based screen variations. Prototypes are shareable through public links, and the specification can be downloaded in Markdown for AI coding tools such as Cursor, Replit, Lovable, and Claude Code. Some features work without an account; full access requires Google sign-in. The Free plan costs nothing and includes one project, seven screens per month, prototype generation, chat refinement, sharing, and export. Founding Member also costs nothing and includes five projects, 100 screens per month, sharing with anyone, export, and priority support. Existing screens remain accessible after reaching a limit. Synclet describes HTTPS/TLS encryption, secure authentication, assessments, and access controls.