Phase vs Flo: Which App Should You Actually Use?
Flo and Phase are not really competitors. Flo is the world's most downloaded period and fertility tracker, built to log your health and predict your cycle. Phase is a productivity app that uses your cycle as an input to tell you what to work on and when. Use Flo for health. Use Phase for work. Many women use both.
Quick Comparison
| Feature | Flo | Phase |
|---|---|---|
| Primary purpose | Period & fertility tracking | Productivity & scheduling |
| Main output | Predictions, health insights | Mental readiness, task priority |
| Best for | Health, fertility, pregnancy | Working women managing time |
| Calendar integration | No | Yes (Google, Outlook) |
| Task manager integration | No | Yes (Todoist, Notion, Asana, Linear) |
| Pregnancy mode | Yes | No |
| Price | Free, Premium £7.99/mo | From £7.99/mo |
What Flo Does Well
Flo has earned its position. Over 420 million downloads globally, an enormous symptom library, AI chat, a pregnancy mode that genuinely supports women through conception and through pregnancy, and a community layer that makes reading about your body feel less lonely. It learns fast. It predicts reliably. It flags irregularities. For women in the fertility stage of life, it’s the right tool. We don’t have a bad word to say about Flo. It’s a category-defining product. It just isn’t a productivity tool.
What Phase Does Differently
Phase uses your cycle but uses it for something else entirely. You log where you are in your cycle. That data flows into a productivity engine, alongside sleep and stress, and generates a mental readiness score. The app then recommends what to work on and when to schedule the hard stuff, with live integrations into your calendar and your task manager. Flo tells you when your period is coming. Phase tells you when to pitch, when to prep, when to batch admin and when to block out deep work.
The Honest Differences
Purpose. Flo is a health app. Phase is a work app.
Input vs output. In Flo, your cycle is the output — you log it, it predicts. In Phase, your cycle is the input — you log it, and the app generates a schedule recommendation.
Integrations. Flo integrates with Apple Health and Google Fit. Phase integrates with Google Calendar, Outlook, Notion, Todoist, Asana and Linear. The integration list tells you everything.
When to Choose Flo
Choose Flo if your primary goal is understanding your cycle, trying to conceive, tracking a pregnancy, logging symptoms over time, or using community content as part of how you learn about your body.
When to Choose Phase
Choose Phase if your primary goal is to structure your working week around your biology. If you are mid-career, busy, and tired of explaining to yourself why some weeks feel unstoppable and others feel impossible, Phase is built for exactly that.
Using Both Together
Keep Flo for health logging. Open Phase in the morning for a two-minute work check-in. They don’t conflict. They don’t duplicate. Flo holds your health history. Phase holds your next move.
FAQ
Will Phase import data from Flo? Not yet. You log your cycle directly in Phase, which takes under a minute a day.
Does Phase have a pregnancy mode? No. If you are pregnant, Flo is the right tool. Phase is designed for cycling women.
Does Phase have a free tier? Phase offers a 14-day free trial rather than a permanent free tier, because the productivity engine is the whole product.
Conclusion
Flo is a brilliant health tracker. Phase is a brilliant productivity tool. They are answering different questions. If you care about both your body and your working week — most of us do — use both. Try Phase free for 14 days.