The short version
Flo is a period and fertility tracker with wellness content. Lunar is a cycle-aware planner for ADHD women. Different jobs. Most ADHD women track in one app and plan in another — Lunar connects them.
What Flo does well
- Sophisticated cycle predictions. Years of data behind the algorithms.
- Pregnancy mode. Comprehensive prenatal tracking when that's the use case.
- Educational content library. Articles, videos, expert content covering most cycle topics.
- Symptom logging breadth. Track almost anything cycle-related.
Where Flo stops for ADHD women
- It's a tracker, not a planner. Flo will tell you you're in luteal. It won't help you decide what to do today.
- Heavy upsell pressure. Premium nudges in most flows, which is its own ADHD friction.
- Notification overload. Daily content + reminders that compete with the rest of your attention.
- Privacy reputation has been rocky. Worth knowing if you're sensitive about cycle data.
Side by side
| Feature | Flo | Lunar |
|---|---|---|
| Cycle prediction depth | Best in class | Lighter — focused on planning |
| 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 (Pro) |
| Body doubling | No | Yes |
| Ads / upsell pressure | Constant | Minimal |
| Pregnancy mode | Comprehensive | Not the focus |
| Free tier | Generous | Free, no card required |
Why Lunar exists
Predicting your period doesn't solve the day. You can know luteal is coming and still spend the week feeling like you've forgotten how to be a person. Lunar's premise is that the cycle phase is an input into your daily plan — not just a chart you stare at.
Two questions every morning: cycle phase, current energy. The task list filters down to what fits. No content firehose. No pop-up asking if you want to upgrade.
The notification problem Flo has for ADHD brains
Flo sends regular notifications: daily health tips, symptom reminders, article prompts, "your cycle is coming" alerts, premium upgrade nudges. For a neurotypical user managing their health, this is useful. For a woman with ADHD, it's another attention interrupt in a day already full of attention interrupts — and the constant content makes it hard to use the app quickly, get what you need, and get out.
Lunar's notification philosophy is the opposite. Push notifications go out only for body doubling sessions you've signed up for and morning check-in reminders. That's it. The app opens, you answer two questions, you see your filtered task list, you close it. The interaction is designed to take under 60 seconds.
What a real week looks like
Flo, luteal phase, Monday morning. You open Flo for your period prediction. You get a push: "Try these 5 luteal phase recipes 🌿." You read two of them. You notice a premium badge on the sleep quality feature. A banner ad appears. You've spent 8 minutes in a period tracker when you meant to spend 30 seconds. You still haven't figured out what you're doing with your day.
Lunar, same morning. You open Lunar. One question: cycle phase. You tap "luteal." Second question: energy. You tap "low." Your task list shows 3 items. You know what you're doing today. You close the app. Total time: 45 seconds.
Common questions
Can I use Flo and Lunar together?
Yes, and it's a natural split. Flo for deep cycle tracking, fertility predictions, and health content. Lunar for daily planning that responds to where you are in your cycle. Your Flo data informs your Lunar check-in — you know from Flo you're in luteal, you select that in Lunar, and the task list adjusts. Two-app stack, no overlap.
Does Lunar sell cycle data like Flo has been accused of?
No. Lunar does not sell your data to advertisers, data brokers, or third parties. Your cycle phase and task data stay in your account. This is a genuine differentiator — Flo faced regulatory scrutiny in 2021 for sharing health data with third-party analytics. Lunar is built by a single indie developer with a privacy-forward design from the start.
Does Lunar work without precise cycle data?
Yes. You select your phase manually at each check-in — no historical data required, no algorithm predicting your next period. If you're unsure of your phase, you can skip it and just log your energy level. The task filter still works based on energy alone, and the cycle layer adds more context as you log over time.
If you came from Flo
You can keep Flo for the deep predictions and fertility tracking, and use Lunar for the daily plan. Or use Lunar's lighter built-in tracking if you don't need the heavy features. The decisive question is simple: do you want your cycle data to actually change what your task list shows you each morning? If yes, Lunar is the tool that makes that connection. Flo gives you the insight. Lunar turns it into a plan.