Her Flo vs Vitals Sync
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Her Flo
Track your menstrual cycle, log period dates, flow, symptoms, and notes. This app helps you monitor your health and provide accurate information to your doctor, especially useful for teens and pre-teens experiencing irregular cycles.
- Log period dates and duration
- Record flow amount
- Track symptoms and notes
- Review past logged data
- Monitor menstrual health
- Suitable for teens and pre-teens
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Remember your doctor visits where you were asked when your last period was, and how long it was? And you just couldn’t remember so you had to end up giving the doctor a random estimate. These estimates give doctors unreliable data, which means an unreliable diagnosis. And perhaps there was that one time when your period was extremely painful, or there was a very unusual symptom, but you never really noticed. These small details are very important for your health, and giving the right information can prevent problems in your periods from becoming worse. Her Flo will help you exactly with that. Using our app, users can log their periods, and enter information such as their period date, flow amount, symptoms, and additional notes. The user can also take a look at previous symptoms that they logged, and check for anything unusual or odd in their periods. 9-14% of women have irregular periods*. That means around 535 million women suffer from periods that they can’t fully be prepared for. This leads to several problems… * Many women don’t even notice these irregularities between their busy lives, and miss signs that there is something unhealthy about their periods. * On top of that, young pre-teen girls who just had their first periods are confused. They have just experienced painful cramps, headaches, and more. * Most girls have irregular periods in their first few years, because their body is still new to this and doesn’t have a set schedule. It also reacts in different ways, and for some, these can be concerning. * And with their eventful teenage lives, these unpredictable and harsh periods just make things worse. Her Flo helps women of all ages, especially pre-teens and teens monitor their periods and stay healthy. So next time your doctor asks these questions, you can give them a confident and reliable answer just by checking the previous data you entered. *Source: Penn Medicine 2020
Vitals Sync
This app imports key health metrics from your Garmin device that are not automatically synced to your phone's health app. It securely transfers HRV, Respiration, SpO₂, and VO₂ Max data directly from your device.
- Syncs HRV, Respiration, SpO₂, and VO₂ Max
- Automatic background sync
- No duplicate entries
- Secure token-based authentication
- On-device processing
- No app account or tracking
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Vitals Sync imports four metrics your Garmin records but does not send to the Health app: HRV, Respiration, SpO₂, and VO₂ Max. Everything runs on your device. You sign in with your Garmin Connect account. The app reads the data your Garmin watch already recorded and writes it to the Health app on your iPhone. Most syncing tools cover only HRV. Vitals Sync does all four. WHAT YOU NEED • A Garmin Connect account • A Garmin watch that records these metrics, like the Forerunner, Fenix, Venu, vívoactive, Instinct, Epix, or Enduro series, and more WHAT IT SYNCS • Heart Rate Variability (HRV) • Respiration rate • Blood oxygen (SpO₂) • VO₂ Max FEATURES • Automatic background sync • No duplicates. Every reading is written once. • Your password is not stored. Only secure tokens, kept in the iOS Keychain on your device. • No account for this app, no tracking, no analytics, no servers PRIVACY Vitals Sync has no backend. It talks directly from your iPhone to your own Garmin account and to the Health app. We never see, collect, or store your data. Vitals Sync is an independent product and is not affiliated with, endorsed by, or sponsored by Garmin Ltd. or its subsidiaries, or by Apple Inc. Garmin® is a registered trademark of Garmin Ltd.
Screenshots
Verdict
The clearest difference is review sentiment: Her Flo at 100% against Vitals Sync's 0%. Her Flo also leads on rating (5.0 vs 1.0) and ratings volume (6 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Her Flo holds the better App Store score, 5.0 against 1.0. That said, the two scores are not equally well evidenced: Her Flo has 6 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Her Flo's written reviews are positive against 0% of Vitals Sync's.
| Parameter | Her Flo | Vitals Sync |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (6 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 6 — better | 1 |
| Update frequency | — | Every 11 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 11 — better | 17.0 |
| Further details — not scored | ||
| Size | 49 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Busy Buzzy Bots Inc. | UMUR GOKALP |
Customer experience
Her Flo
Vitals Sync
In-app purchases
Her Flo
No in-app purchases
Vitals Sync
No in-app purchases









