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Cairn
Tallinn, Estonia
What it is
Cairn is a macOS app for mapping product screens, data, user roles and CRUD operations before development. You can sketch low-fidelity pages, modals and sheets, then link screens into scenarios with triggers and dependencies across roles. When you run a flow, Cairn checks whether data used on each screen was created earlier in that flow and flags gaps. Fields and Journeys views help trace where information appears and the order each role follows. Projects are stored as portable .cairn files on your Mac, and the app works offline. The maker says Cairn has no accounts or telemetry and does not upload project files; it connects online for update checks and Pro license validation. Cairn is intended to complement Figma during later visual design, rather than handle pixel-perfect or high-fidelity work. The free plan includes one project and up to two scenarios, with unlimited nodes and blocks but no file import or export. A trial is available, and paid access starts at €39.
For and against
For
- Works offline and stores portable project files locally
- Flags data missing from a screen's earlier flow
- Maps journeys across roles with triggers and dependencies
- Free plan includes unlimited nodes and blocks
Against
- Free plan is limited to one project and two scenarios
- Free plan has no file import or export
- Real-time collaboration is not available
- Not intended for pixel-perfect or high-fidelity design
The verdict
Cairn focuses on checking how product screens and data fit together before implementation. Its free plan covers small projects, while file import and export require the paid plan, which starts at €39.
Who it suits
Cairn suits founders, product managers, agencies, freelancers and technical teams who want to map screens, roles and data flows before building. It is for macOS users comfortable with low-fidelity planning rather than polished interface design.
Plans and prices
Free
1 project · up to 2 scenarios · unlimited nodes and blocks · no importing, exporting or saving to file
Read 15 Oct 2026 · cairnflow.app
Pro — perpetual
unlimited projects and scenarios · import, export and save to file · 1 year of updates · perpetual use
Read 15 Oct 2026 · cairnflow.app
On the record
- Automatic checks
- Cairn continuously checks whether each data item used by a screen was created somewhere in its causal chain.cairnflow.app · read 15 Oct 2026
- Company
- The product is made by The No-Code Company OÜ, whose listed address is in Tallinn, Estonia.cairnflow.app · read 7 Oct 2026
- Company activity
- The register classifies the principal activity as computer programming.ariregister.rik.ee · read 15 Oct 2026
- Company ownership
- The register lists Jose Maximiliano Ogas Nieva with 60% and Francesc Box Coma with 40% ownership.ariregister.rik.ee · read 15 Oct 2026
- Company registration
- The Estonian e-Business Register lists The No-Code Company OÜ under registry code 16294378.ariregister.rik.ee · read 15 Oct 2026
- Cross-flow dependencies
- Flows can declare causal dependencies, including dependencies between different roles; Cairn warns about cycles and broken references.cairnflow.app · read 15 Oct 2026
- CRUD data modeling
- Each screen block can specify which data it creates, reads, updates or deletes.cairnflow.app · read 15 Oct 2026
- Developer extensibility
- The opened official product, privacy and terms pages describe a standalone local desktop app and do not state a public API, SDK, plugin system or self-hosting option.cairnflow.app · read 15 Oct 2026
- Fields view
- A Fields view shows where each data item is used throughout the product model.cairnflow.app · read 15 Oct 2026
- Flow modeling
- Screens can be chained into scenarios with connectors, triggers and dependencies across roles.cairnflow.app · read 7 Oct 2026
- Integrations
- The maker describes Cairn as complementary to Figma for later visual design; no other product integrations are stated on the opened page.cairnflow.app · read 7 Oct 2026
- Intended users
- The maker identifies founders and product managers, agencies and freelancers, and technical teams as intended users.cairnflow.app · read 7 Oct 2026
- Internet connections
- The app's stated network connections are update checks and Pro-license validation.cairnflow.app · read 15 Oct 2026
- Journeys view
- A Journeys view shows the complete causal journey of each role.cairnflow.app · read 15 Oct 2026
- Legal form
- The company is registered as an Estonian private limited company.ariregister.rik.ee · read 15 Oct 2026
- Licence
- The Pro licence is perpetual, personal and non-exclusive; users may activate it on their own machines but may not resell or sublicense it.cairnflow.app · read 15 Oct 2026
- Limit: collaboration
- Real-time collaboration is listed as coming soon rather than currently available.cairnflow.app · read 15 Oct 2026
- Limit: free plan storage
- The free plan does not allow importing, exporting or saving projects to files.cairnflow.app · read 15 Oct 2026
