Comparison

HeartMath vs Flex Your Feminine

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

Head to head
About

HeartMath

This app helps you manage stress, improve focus, and achieve optimal performance by aligning your heart, mind, and emotions. It offers guided sessions, immersive journeys, and coherence practices based on over 30 years of research.

Highlights
  • Real-time HRV Coherence Measurement
  • Coherence Training
  • Scientifically Validated Techniques
  • Guided Learning Sessions
  • Progress Tracking
  • Heart-Brain Coherence Benefits
Features
Read full description

Align your heart, mind, and emotions to help you manage stress, improve focus, and perform at your best. Enjoy HeartMath’s free intro experience to access your heart’s natural intelligence and see your heart-brain coherence as real-time feedback. Then start your 7-day free trial to explore a comprehensive collection of guided sessions, immersive journeys, and coherence practices designed to help you experience greater calm, focus, clearer thinking, and a more balanced you. **Inner Balance Coherence Plus sensor owners: Use your sensor to unlock a lifetime subscription.** Built on 30+ years of research on the heart-brain connection and supported by over 500 research studies, HeartMath is used in wellness and resilience programs at organizations including Stanford Healthcare and Kaiser Permanente, as well as in professional sports, the military, law enforcement, leading universities, non-profit organizations, and major corporations. It is used by coaches, trainers, and health professionals for stress education and resilience training. The HeartMath system is more than stress management: it’s a journey to more heart-centered living. This app puts HeartMath’s practical, research-supported tools right at your fingertips. Make mental and emotional well-being an achievable part of your daily life. The HeartMath technology is for stress education and resilience training. It is not a medical device. We encourage you to consult a health professional before making any medical decisions. KEY FEATURES • Real-time HRV coherence feedback: Use your phone’s camera or upgrade to the Inner Balance Coherence Plus sensor for a more precise signal and a free app subscription. • Coherence training: Whether you choose the game or the guided mode, watch your heart-rhythm pattern and coherence change in real time. • Research-Supported: Techniques developed from 30+ years of scientific research to help boost focus, positive feelings, and your ability to manage stress. • Guided learning: Explore guided meditations, courses, and videos led by HeartMath trainers. • Progress tracking: View your progress over time with a variety of chart options. WHAT REGULAR COHERENCE PRACTICE CAN SUPPORT Heart-brain coherence is a balanced, focused state you create yourself through calm breathing and positive focus. Coherence supports the body’s natural ability to shift from tension to calm, helping you manage everyday stress and build inner balance. • SUPPORTS STRESS MANAGEMENT & EMOTIONAL BALANCE • SUPPORTS FOCUS AND MENTAL CLARITY — coherent states are associated with more focus, clarity, and creativity. • SUPPORTS RESILIENCE — regular practice can help you adapt to and recover from challenging situations more quickly. • ENHANCES EMOTIONAL WELL-BEING AND SELF-AWARENESS — practice can support a greater sense of inner calm and a more mindful relationship with your emotions. Subscription terms: • Subscriptions renew automatically at the end of each year. • You can cancel your subscription at any time in your account settings. • You will not be refunded for any unused portion of a subscription. • Price is subject to change. • Subscriptions are not available in all countries. • Full subscription terms: https://my.heartmath.com/terms If you’d like to purchase an Inner Balance Coherence Plus sensor to unlock complimentary lifetime access to the HeartMath app, please visit the HeartMath website.

About

Flex Your Feminine

This app offers personalized workout and meal plans to help you achieve your fitness goals. It includes progress tracking, nutrition logging, and direct messaging with a coach for support and guidance.

Highlights
  • Personalized workout plans
  • Customized nutrition and hydration tracking
  • Direct messaging and video calls with coach
  • Daily check-ins and progress analytics
  • Wearable device integration
  • Apple Health integration
Features
Read full description

Kick-start your fitness journey with Flex Your Feminine. Together with Kayla Michelle, you'll have the best combination of nutrition & exercises available on a single app. With Flex Your Feminine, you can begin your fitness journey in no time. Get a fully personalized workout and meal plan tailored to your fitness goals. Progress tracking gets easier when you log your daily workout, record meals, update your check-ins and connect your fitness band & health kit, and get real-time updates via advanced analytical tools. Everything that contributes to your fitness goals gets captured in one place. To top it all, use the inbuilt 1-1 chat feature to have all your queries addressed on the go. You deserve to be the best. That’s why Flex Your Feminine have packed so many features in a single app to help you achieve your fitness goals. Start your journey today! Features that will help you achieve your fitness goals include: * Personalized Workout Plan: Get a fully personalized fitness plan tailored to your goals, whether it is to gain weight, lose weight, gain muscles, or simply wish to work on your general fitness. * Nutrition, Hydration & Habits: Access meal plans assigned by your coach and log your food intake to keep a close track of your calorie intake and macros. You can also track your hydration, steps and calories burnt on the app. * Instant messaging & video calls - Message your coach in real-time and schedule video sessions directly from the app. Stay connected with your coach to improve compliance and get better results. * Check-ins: Gain complete insight into your overall performance with easy check-ins and real-time updates. * Progress: Stay on top of your progress with powerful analytics. * Wearable integration: Get the bigger picture of your progress by connecting your fitness band & health kit thereby enabling real-time updates. Note regarding Apple Health: The app integrates with Apple Health to show your daily activity - distance, steps, active energy, and flights to help you better achieve your goals. App also uses Apple Health to track energy burned and heart rate during a workout session, if an Apple Watch is used. Workout metrics are shared with the coach to better design your workout schedule. DISCLAIMER: Users should seek a doctor’s advice before using this app and making any medical decisions.

Screenshots

HeartMath4 screens
Flex Your Feminine4 screens

Verdict

The call

The clearest difference is review sentiment: Flex Your Feminine at 100% against HeartMath's 74%. Flex Your Feminine also leads on iOS requirement (15.0 vs 26.0). HeartMath's advantage is ratings volume (4.7K vs 9) and rating (4.9 vs 4.6). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. HeartMath sells 4 in-app purchases, starting at $39.00 per year and Flex Your Feminine sells 5 in-app purchases, starting at $45.90 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

HeartMath holds the better App Store score, 4.9 against 4.6. That said, the two scores are not equally well evidenced: HeartMath has 4.7K ratings behind it against 9, so its average is the more settled of the two. Written reviews complicate that: 74% of HeartMath's written reviews are positive against 100% of Flex Your Feminine's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

HeartMath ships an update every 3 weeks, Flex Your Feminine every 2 months. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

Scorecard5 real differences · 5 level
HeartMath versus Flex Your Feminine: the parameters behind the verdict, then further details
ParameterHeartMathFlex Your Feminine
PriceFreeFree
Rating4.9 (4.7K ratings) — better4.6 (9 ratings)
Positive reviews73.8% of reviews100.0% of reviews — better
Number of ratings4.7K — better9
Update frequencyEvery 3 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhoneiPhone, iPod — better
Requires iOS26.015.0 — better
Further details — not scored
Size185 MB133 MB
Age rating4+17+
DeveloperHeartMath Inc.Kayla Harrington

Customer experience

HeartMath

All ratings4,564 ratings
Positive96.9%
Neutral1.8%
Negative1.3%
Written reviews172 reviews
Positive73.8%
Neutral5.2%
Negative20.9%

Flex Your Feminine

All ratings9 ratings
Positive88.9%
Neutral0.0%
Negative11.1%
Written reviews8 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

HeartMath

Reported bugs

4 issues
  • Sensor connection issues on newer devices
  • App crashes and freezes on iPhone 16 Pro
  • Inaccurate heart rate and coherence readings
  • Screen sleep behavior disrupting sessions

Requested features

5 requests
  • Add dark mode option
  • Allow playing music/sounds during sessions
  • Provide audio feedback on coherence levels
  • Add session history customization and details
  • Improve sensor compatibility with older devices

Flex Your Feminine

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

HeartMath

Subscriptions4
  • HeartMath Premium7 Days trial$39.001 Year
  • HeartMath Premium7 Days trial$59.001 Year
  • HeartMath Premium7 Days trial2 variants$79.001 Year
Show 1 more
  • HeartMath Premium7 Days trial$99.991 Year
5 purchases

Flex Your Feminine

Subscriptions4
  • TEMPLE$45.901 Month
  • TEMPLE- 6 monthly$244.996 Months
  • TEMPLE- Quaterly$299.003 Months
Show 1 more
  • TEMPLE- Yearly$494.991 Year
One-time1
  • FYF 30 Days Starter Plan$499.00

Questions

Is HeartMath free?
HeartMath is free to download, with in-app purchases available.
Is Flex Your Feminine free?
Flex Your Feminine is free to download, with in-app purchases available.
Which has better reviews, HeartMath or Flex Your Feminine?
HeartMath is rated higher. HeartMath averages 4.9 out of 5 from 4.7K ratings, while Flex Your Feminine averages 4.6 from 9 ratings.
Do HeartMath or Flex Your Feminine have ads?
Neither HeartMath nor Flex Your Feminine shows ads.
Which is updated more often, HeartMath or Flex Your Feminine?
HeartMath ships an update every 3 weeks, and Flex Your Feminine every 2 months. Most recently, HeartMath was updated on October 30, 2026 and Flex Your Feminine on October 24, 2026.

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