The core difference
Flo is a comprehensive period, fertility, and wellness platform — sophisticated predictions, pregnancy tracking, health content library, and a large user community. Lunar is a minimal cycle-aware task planner — it captures your phase and energy level, then uses both to filter your task list every morning.
Lunar uses your cycle phase to plan tasks. It doesn't track your period. See how a cycle-aware ADHD planner works.
The design philosophies are opposite. Flo gives you more content and more features. Lunar gives you fewer decisions and less friction. For ADHD brains, fewer decisions is often the better product.
Feature comparison
| Feature | Flo | Lunar |
|---|---|---|
| Cycle prediction depth | Best in class | Lighter — planning-focused |
| Task management | No | Yes — core |
| Built for ADHD women | General audience | Yes |
| Cycle data → daily plan | Tracking only | Yes — filters tasks |
| Energy-based filter | No | Yes — 4 levels |
| AI task breakdown | No | Yes |
| Ads / upsell pressure | Constant | Minimal |
| Privacy track record | Regulatory scrutiny 2021 | Privacy-forward indie app |
| Pregnancy mode | Comprehensive | Not the focus |
| Free tier | Generous | 14-day free trial, then subscription |
Who should choose Flo
- You need precise fertility tracking or pregnancy support
- You want the deepest cycle prediction algorithm available
- Comprehensive health content and a large community are useful to you
- Android or web access is a requirement
Who should choose Lunar
- You want your cycle data to change your daily task list, not just chart it
- ADHD means you need fewer notifications and less friction, not more
- Privacy around your health data is important to you
The notification problem
Flo sends regular notifications: daily health tips, symptom reminders, article prompts, cycle alerts, premium upgrade nudges. For a neurotypical user, this is useful. For a woman with ADHD, it's another attention interrupt in a day already full of them — and the constant content makes it hard to open the app quickly and get out. Lunar's notification philosophy is the opposite: check-in reminders and gentle task nudges only. Open it, answer two questions, see your list, close it. Total time: under 60 seconds.
Verdict
Choose Flo for comprehensive cycle and fertility tracking — it's the most feature-rich option in that category by a significant margin. Choose Lunar if your goal is translating cycle awareness into daily ADHD task management, with minimal noise and no upsell pressure. Natural stack: Flo for data depth, Lunar for daily planning.