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Cairn
What Cairn is
Cairn is a macOS app for mapping how a product’s screens, data, roles and create, read, update and delete operations fit together before development. You can sketch low-detail pages, modals and sheets, then connect screens into scenarios with triggers and dependencies across roles. Running a scenario checks whether the data used on each screen was created earlier in that flow, and flags data that is missing. Fields and Journeys views help trace where information is used and follow each role’s journey in causal order.
Cairn works offline and saves projects as portable .cairn files on your Mac. The maker says it has no accounts or telemetry, and does not upload project files. It connects to the internet for update checks and Pro license validation. Stripe processes payments; Cairn stores an email and license and purchase details to issue and validate licenses. The app is intended to complement Figma for later visual design, while remaining focused on structure rather than pixel-perfect or high-fidelity work. Cairn is made by The No-Code Company OÜ in Tallinn, Estonia. A free plan and trial are available; the pricing note says paid access starts from €39.
Who it suits
Cairn suits founders and product managers, agencies and freelancers, and technical teams who need to map screen flows and check data dependencies before building. It is for macOS users who want low-fidelity structure and causal flow checks alongside later visual design in Figma.
What it does well
- Models screens, data, roles and CRUD operations together.
- Flags data used before it is created in a flow.
- Fields and Journeys views trace data and role paths.
- Works offline and stores projects in portable .cairn files.
- Maker says project files are not uploaded.
What to know first
- 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.
Limits
The Free plan allows one project and up to two scenarios, with unlimited nodes and blocks. It does not include file import or export; the Pro perpetual plan includes import, export and saving to file, unlimited projects and scenarios, and one year of updates.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | 1 project · up to 2 scenarios · unlimited nodes and blocks · no importing, exporting or saving to file | Free |
| Pro — perpetual | one-time payment · unlimited projects and scenarios · import, export and save to file · 1 year of updates · perpetual use | €39, paid once |
As cairnflow.app lists them, read 15 Oct 2026. The maker's own page has the final word.
Getting started
- Open https://cairnflow.app/en/ on a Mac.
- Start with the Free plan or use the available trial.
- Sketch page, modal or sheet screens.
- Connect screens into scenarios with roles, triggers and dependencies.
- Run flows and inspect Fields or Journeys views.
Verdict
Choose Cairn if you use macOS and need to map role-based flows and catch missing data before development. Look elsewhere if your work depends on real-time collaboration or detailed visual design.
Questions
What does Cairn cost?
The pricing note says Free plan and paid from €39. The Pro plan is a one-time payment, but its listed plan price is not given.
Is there a free plan or trial?
Yes. Cairn has a Free plan and a free trial.
Which platforms does Cairn support?
Cairn is a macOS desktop app.
Can Cairn work offline?
Yes. It works offline and stores projects as portable .cairn files on the user's Mac.
Does Cairn integrate with other products?
The maker describes it as complementary to Figma for later visual design.
Who makes Cairn?
It is made by The No-Code Company OÜ, whose listed address is in Tallinn, Estonia.
Facts from Cairn's own pages
- Automatic checks
- Cairn continuously checks whether each data item used by a screen was created somewhere in its causal chain. · cairnflow.app, 15 Oct 2026
- Company
- The product is made by The No-Code Company OÜ, whose listed address is in Tallinn, Estonia. · cairnflow.app, 7 Oct 2026
- Company activity
- The register classifies the principal activity as computer programming. · ariregister.rik.ee, 15 Oct 2026
- Company ownership
- The register lists Jose Maximiliano Ogas Nieva with 60% and Francesc Box Coma with 40% ownership. · ariregister.rik.ee, 15 Oct 2026
- Company registration
- The Estonian e-Business Register lists The No-Code Company OÜ under registry code 16294378. · ariregister.rik.ee, 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, 15 Oct 2026
- CRUD data modeling
- Each screen block can specify which data it creates, reads, updates or deletes. · cairnflow.app, 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, 15 Oct 2026
- Fields view
- A Fields view shows where each data item is used throughout the product model. · cairnflow.app, 15 Oct 2026
- Flow modeling
- Screens can be chained into scenarios with connectors, triggers and dependencies across roles. · cairnflow.app, 7 Oct 2026
- Founded
- The Estonian register says the company entered the register on 18 August 2021. · ariregister.rik.ee, 15 Oct 2026
- Headquarters
- Tallinn, Estonia · cairnflow.app, 28 Sept 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, 7 Oct 2026
- Intended users
- The maker identifies founders and product managers, agencies and freelancers, and technical teams as intended users. · cairnflow.app, 7 Oct 2026
- Internet connections
- The app's stated network connections are update checks and Pro-license validation. · cairnflow.app, 15 Oct 2026
- Journeys view
- A Journeys view shows the complete causal journey of each role. · cairnflow.app, 15 Oct 2026
- Legal form
- The company is registered as an Estonian private limited company. · ariregister.rik.ee, 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, 15 Oct 2026
- Limit: collaboration
- Real-time collaboration is listed as coming soon rather than currently available. · cairnflow.app, 15 Oct 2026
- Limit: free plan storage
- The free plan does not allow importing, exporting or saving projects to files. · cairnflow.app, 15 Oct 2026
- Limit: platforms
- The app currently supports macOS on Intel and Apple Silicon; Windows and Linux are described as roadmap items. · cairnflow.app, 15 Oct 2026
- Limit: visual fidelity
- Cairn intentionally does not provide pixel-perfect or high-fidelity design; the maker directs users to Figma for visual polish. · cairnflow.app, 15 Oct 2026
- Limit: warranty
- The terms provide Cairn as-is and as-available without guaranteeing error-free operation or fitness for a particular purpose. · cairnflow.app, 15 Oct 2026
- LinkedIn headquarters
- The maker's LinkedIn page lists Düsseldorf, Germany as its headquarters, while the Estonian register lists Tallinn as the registered address. · de.linkedin.com, 15 Oct 2026
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