Side by side
Cairn vs Rheo
Both stand on user flow software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Mac
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.
Visit Cairn
Free plan AndroidiPhone
Rheo offers visual flow design, experimentation, and funnel and cohort analysis for mobile apps. The free plan has no experiments, and paid plans start at $49.99/mo.
Visit RheoThe facts
| Cairn | Rheo | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | No | Not published |
| Runs on | Mac | Android, iPhone |
| Lowest paid plan | Pro — perpetual: €39, paid once | Grow: $49.99 a month |
| Plans published | 2 | 4 |
| Maker | Not published | Not published |
| Website | cairnflow.app | getrheo.io |
| On user flow software | #6 of 20 | #10 of 20 |
Cairn: 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.
Rheo: what it does well
- Visual canvas supports branching and targeting.
- Teams can compare flow variants and holdouts.
- Flows render natively on iOS and Android, according to Rheo.
- Dashboard includes funnel and cohort views.
- Free plan includes 400 MAU.
What to know first
- Free plan has no experiments.
- Free plan is limited to one app.
- Exceeding the included MAU quota pauses the SDK.
- Swift, Flutter, and Kotlin are marked coming soon.