LYNA vs Flo: which app do you actually need?

Flo and LYNA are both apps for women's health, but they answer different questions. Flo helps you understand when things happen in your cycle. LYNA helps you decide what to eat because of it.

A note up front: LYNA is our app. We've tried to compare them fairly, and for plenty of people Flo is the right choice, or the two work well together.

The short version

• Choose Flo if you mainly want period, ovulation or pregnancy tracking
• Choose LYNA if you want a nutrition plan for PCOS, trying to conceive or perimenopause
• Use both if you want detailed cycle tracking and a plan for what to eat

Expert picks: what to read next

• Comparing apps for PCOS? Here's the best PCOS apps in 2026 and what each one is good for.
• Does your cycle really change what you should eat? Here's the real evidence behind cycle syncing.

What Flo does best

Flo is one of the most widely used period trackers, with a 4.7-star rating from around two million reviews on the App Store. It tracks your period whether it's regular or irregular, predicts ovulation and fertile days, and has a pregnancy mode with week-by-week updates.

You can log more than 70 symptoms and moods, and Flo turns them into insights about your cycle. Its free Anonymous Mode lets you use the app without linking your name or email, and Flo for Partners lets you share predictions with someone else.

Flo Premium adds a symptom checker with educational information on conditions such as PCOS, endometriosis and fibroids, expert-led video courses, and a virtual health assistant.

What LYNA does best

LYNA starts with a free 2-minute quiz for PCOS, fertility or perimenopause, and builds a nutrition plan around the pattern most linked to your symptoms. For PCOS that means steadying insulin with fibre, protein and magnesium. When you're trying to conceive, it means closing nutrient gaps such as folate, iron and omega-3. In perimenopause, it means balancing protein, carbohydrates and fats.

The app then gives you meals and recipes that fit the plan, daily nutrient targets, and meal tracking alongside your cycle, so you can see how food lines up with how you feel.

Where they differ

• Main job: Flo tracks your cycle; LYNA plans and tracks your nutrition around it
• Food: Flo's App Store listing doesn't include meal plans or recipes; LYNA is built around them
• Conditions: Flo's symptom checker gives educational information about conditions such as PCOS; LYNA builds a nutrition plan for PCOS, fertility or perimenopause
• Pregnancy: Flo has a full pregnancy mode; LYNA focuses on nutrition before conception
• Price: both have a free starting point (Flo's free tracker, LYNA's free quiz), and both charge for the full experience

Can I use Flo and LYNA together?

Yes. Many people keep Flo for period and ovulation tracking and use LYNA for what to eat. The two don't overlap much, so you won't be logging the same thing twice.

Is Flo good for PCOS?

Flo copes with irregular cycles and its Premium symptom checker can help you understand PCOS symptoms, which is useful before or after a diagnosis. It doesn't give you a PCOS meal plan, so if food is where you need help, that's the gap LYNA fills.

Is Flo or LYNA better for trying to conceive?

For timing, Flo is the stronger tool: it predicts ovulation and fertile days, and continues into pregnancy. For preparing your body, LYNA focuses on the nutrients that matter most before conception. If you're trying to conceive, using both makes sense.

Can either app diagnose a condition?

No. Flo's symptom checker is educational, and LYNA is a nutrition app. If you think you might have PCOS, endometriosis or another condition, or you've been trying to conceive without success, talk to a doctor.