Cairn vs FlowSnap

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.

FlowSnap turns app screenshots into sitemaps and user-flow diagrams for product managers, UX designers, and indie developers. Its infinite canvas supports panning, pinch zoom from 10% to 200%, color-tagged cards, and text annotations. A project can import up to 50 screenshots from a photo library or Google Drive. Users can connect cards with solid or dashed lines, customize connection colors, and label transitions. Optional AI tools analyze screenshots, suggest connections, and generate a Markdown sitemap summary; they require the user's Claude API key and send screenshots to Anthropic's Claude API. Projects are stored locally and can optionally sync to a FlowSnap folder in Google Drive, while the listing says FlowSnap does not store project data. Exports include PNG, PDF, SVG, JSON, and Markdown. The free plan allows three projects and adds a watermark to PNG exports. FlowSnap Pro costs $2.99 a month or $19.99, paid once, with unlimited projects, PDF export, watermark-free PNG, SVG, and priority AI features. Supported platforms are Android, iOS, and macOS.