HarmoFlux vs Flo
Flo is one of the most widely used cycle apps in the world, and it is good at what it was built for. HarmoFlux was built for a different job. Here is the difference, stated plainly.
Flo is primarily a cycle, ovulation and pregnancy app for the reproductive years. HarmoFlux is a lifecycle health-tracking app: first periods through postmenopause, with medication and supplement tracking, a 'how I felt after taking it' note, a doctor-ready PDF summary, plans at $0, $1.99 and $4.99 per month, no ads and no sale of personal health data. Neither app is a medical device, and neither replaces a clinician.
Written by The HarmoFlux editorial team at Panzica Technologies Inc.. Last reviewed . Editorial standards.
Educational information based on cited authoritative sources. Not individually reviewed by a medical professional, and not medical advice.
Facts checked against publicly available information on .
What each app is built around
- Flo: cycle and ovulation tracking, pregnancy and conception content, and a large in-app content library, centred on the reproductive years.
- HarmoFlux: one continuous health history across the whole hormonal lifecycle, designed so the record stays useful when the reason for tracking changes.
Different goals, not better and worse. If your question is 'where am I in this cycle', a cycle app answers it. If your question is 'what has actually been happening to me over the last six months, and what have I been taking', that is what HarmoFlux is for.
Where HarmoFlux is different
- First periods through postmenopause: the same app for early cycles, the reproductive years, perimenopause, menopause and after — no migrating your history when your stage changes.
- Medication and supplement tracking: what you took, the dose and when, including supplements, which most cycle apps treat as an afterthought.
- 'How I felt after taking it': a short reflection attached to the entry, recorded as timing, never as proof of cause.
- Doctor-ready summaries: a dated PDF assembled from your own entries, plus CSV export, on the Core plan.
- Affordable plans: free to start, $1.99/month Core, $4.99/month Plus.
- No ads and no sale of personal health data; subprocessors, retention and deletion are published.
Where Flo may suit you better
- You want ovulation and fertility-window features. HarmoFlux deliberately does not offer fertility prediction, and its projected dates are calendar arithmetic that must never be used for contraception.
- You are trying to conceive or are pregnant and want content and tools built for that.
- You want a very large in-app content library and community features.
We would rather you pick the right tool than the one on this page.
How to compare them yourself
Both apps change. Rather than trusting a comparison page, including this one, check these at the moment you decide:
- Current subscription price in your country, and what the free tier includes.
- The privacy policy: whether health data is used for advertising, which third parties process it, and how long it is kept.
- Whether you can export your data and delete your account, and how.
- Whether the app covers the life stage you will be in three years from now.
What neither app does
- Neither is a medical device, and neither diagnoses conditions.
- Neither can tell you that a medication or supplement caused a symptom.
- Neither replaces a physician or pharmacist, and neither is an emergency service.
- HarmoFlux does not check interactions between medications or supplements.
Trademark and affiliation notice
Flo is a trademark of its respective owner; HarmoFlux is not affiliated with or endorsed by Flo Health. This page uses no Flo branding or logos and describes Flo only from publicly available information, which may change after the facts-checked date shown above. If anything here is out of date, email info@harmoflux.com and we will correct it.
Common questions
What is the difference between HarmoFlux and Flo?
Flo is a widely used cycle and pregnancy tracking app focused on the reproductive years. HarmoFlux is a health-tracking app built for the whole hormonal lifecycle, from first periods through postmenopause, and it adds medication and supplement tracking, a note for how you felt after taking something, and a doctor-ready PDF summary. Check each app's current pricing and privacy policy before deciding.
Does HarmoFlux track medications and supplements?
Yes. You can record what you took, the dose and the time, and add a short reflection on how you felt afterwards. HarmoFlux records timing only — it does not claim one caused the other and it does not check interactions.
Which app is cheaper?
HarmoFlux has a free plan, a Core plan at $1.99 per month and a Plus plan at $4.99 per month. Flo publishes its own subscription pricing, which varies by region and promotion, so compare it at the time you subscribe.
Is HarmoFlux better medically than Flo?
No app is medically better than another. Neither HarmoFlux nor Flo is a substitute for a clinician, and HarmoFlux is not a medical device. The useful question is which record-keeping fits the stage of life you are in and the conversations you need to have.
Can I use both?
Yes. Some people keep a cycle app they are used to and use HarmoFlux for medications, supplements and the summary they bring to appointments. One continuous history is usually easier to interpret, but nothing stops you running both.