Comparison

FlowHer vs Calla

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

FlowHer

This app helps women track their menstrual cycles, recovery, sleep, and wellness patterns. It offers insights into how the body changes throughout the cycle and integrates with Apple Watch and Health data for a comprehensive view.

Highlights
  • Period and symptom tracking
  • Cycle and fertility predictions
  • Sleep and stress insights
  • Apple Watch and Health integration
  • AI wellness assistant
  • Recovery reports and trends
Features
Read full description

FlowHer is a cycle and recovery companion designed for women. Track your period, recovery, sleep, stress, symptoms, and daily wellness patterns in one place — with optional Apple Watch and Health insights like HRV, resting heart rate, wrist temperature, sleep, and activity data. FlowHer helps you better understand how your body changes across your cycle in a calmer, more supportive way. —— Cycle Tracking Beyond Dates —— Track periods, symptoms, moods, habits, and body changes in a clean cycle calendar. View period predictions, ovulation estimates, estimated fertility windows, and estimated lower-fertility days for wellness awareness only, not contraception. —— Recovery, Sleep & Stress Insights —— See how sleep, stress, HRV, resting heart rate, wrist temperature, and daily wellness patterns may relate to different phases of your cycle. —— Apple Watch Integration —— Use optional Apple Watch and Health insights to view recovery, sleep, stress, HRV, and cycle information throughout your day. Watch faces and widgets help make reminders feel more personal and accessible. —— Recovery Reports & Trends —— Review cycle patterns, recovery trends, sleep quality, symptoms, and wellness logs over time. FlowHer focuses on long-term patterns and gentle awareness — not one-day judgments. —— AI Wellness Assistant —— Chat with the FlowHer Assistant about your cycle, recovery, symptoms, and wellness routines. Designed for supportive wellness guidance and educational reflections — not medical advice. —— What You Can Do —— • Track periods, symptoms, moods, habits, and wellness changes • View period predictions, ovulation windows, and fertile window estimates • Understand recovery, sleep, stress, HRV, and wellness trends • Connect Health data with your cycle patterns • Review cycle and recovery reports • Use widgets and personalized watch faces • Chat with the FlowHer Assistant —— Privacy & Health Data —— FlowHer only reads or writes related Health data after you grant permission. You can manage permissions at any time in system settings. —— Health Disclaimer —— FlowHer provides wellness insights and cycle estimates only. It is not a medical device and should not be used for diagnosis, treatment, contraception, pregnancy prevention, or medical decision-making. —— Contact Us —— hi@flowher.app Privacy Policy https://docs.flowher.app/FlowHerPrivacy.html Terms of Use https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Calla

This app helps teens understand their menstrual cycles with privacy-focused tracking. It learns individual patterns for accurate predictions and allows logging of various symptoms to connect with cycle phases. Optional parent sharing provides a simple wellness update without revealing sensitive data.

Highlights
  • Personalized cycle predictions
  • Symptom and mood logging
  • Age-appropriate cycle insights
  • Prep-day period reminders
  • Optional parent wellness sharing
  • Privacy-first data storage
Features
Read full description

Most period apps were built for adults trying to get pregnant. Calla wasn't. It's built for teens who just want to understand what's happening in their body - without the noise, the upsells, or the ovulation countdowns. Your data lives on your phone. No accounts required. No ads. No third parties, no data brokers, no advertisers. Optional parent share, if you want it. Privacy-first. Always. All your data stays on your phone. No accounts. No cloud. No ads. No data selling. Period. Built for how your body actually works Irregular cycles? That's normal, especially when you're starting out. Calla doesn't just assume a 28-day cycle - it learns your patterns and gives you predictions that actually make sense for your body. Track what matters to you Log your period, flow level, mood, energy, cramps, sleep, skin, focus, appetite, and activity. See how your cycle connects to how you feel day to day. Understand your cycle Get gentle, age-appropriate insights about each phase of your cycle - what's happening in your body and what to expect. Prep-day reminders Get a heads-up before your period is predicted to start so you're never caught off guard. Parent Mode Share a simple wellness signal with a parent or guardian - "all good" or "heads up" - without revealing any cycle details. Communication on your terms. Calla is not a medical app. It does not diagnose, treat, or prevent any medical condition. If you have health concerns, talk to a doctor.

Screenshots

FlowHer4 screens
Calla4 screens

Verdict

The call

The clearest difference is rating: FlowHer at 5.0 against Calla's 4.3. Calla's advantage is in-app purchases (none vs 8) and ratings volume (6 vs 1). On price, ads and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. FlowHer sells 8 in-app purchases, starting at $7.99 per month. Calla asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

FlowHer holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Calla has 6 ratings behind it against 1, so its average is the more settled of the two.

Scorecard5 real differences · 5 level
FlowHer versus Calla: the parameters behind the verdict, then further details
ParameterFlowHerCalla
PriceFreeFree
Rating5.0 (1 ratings) — better4.3 (6 ratings)
Positive reviews96.7% of reviews—
Number of ratings16 — better
Update frequencyEvery 4 days—
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, Apple WatchiPhone, iPod
Requires iOS17.015.1 — better
Further details — not scored
Size136 MB33 MB
Age rating12+12+
DeveloperHangzhou Dayu Technology Co., LimitedRoxana Heitz

In-app purchases

8 purchases

FlowHer

Subscriptions4
  • FlowHer Monthly Premium$7.991 Month
  • FlowHer Annual Limited$9.991 Year
  • FlowHer Annual Special7 Days trial$17.991 Year
Show 1 more
  • FlowHer Annual Premium7 Days trial$29.991 Year
One-time4
  • 2 AI Theme Generation Credits$0.99
  • 5 AI Theme Generation Credits$1.99
  • 10 AI Theme Generation Credits$2.99
Show 1 more
  • FlowHer Lifetime Premium$69.99
None

Calla

No in-app purchases

Questions

Is FlowHer free?
FlowHer is free to download, with in-app purchases available.
Is Calla free?
Calla is free to download, with no in-app purchases.
Which has better reviews, FlowHer or Calla?
FlowHer is rated higher. FlowHer averages 5.0 out of 5 from 1 ratings, while Calla averages 4.3 from 6 ratings.
Do FlowHer or Calla have ads?
Neither FlowHer nor Calla shows ads.

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