Comparison

D Minder Pro vs HeartMath

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

Head to head
About

D Minder Pro

Track and manage your Vitamin D intake and sun exposure. This app calculates optimal sun exposure times based on your profile and location, and integrates with Apple Health for seamless data exchange. It also provides forecasts and notifications for vitamin D generation opportunities.

Highlights
  • Vitamin D tracking and management
  • Apple Health integration
  • Sun exposure calculation
  • Optimal exposure time alerts
  • Daily forecasts and solar position
  • History and future event scheduling
Features
Read full description

The idea behind this application is that it will help you track and manage your Vitamin D. This new version integrates with the Apple Health app to make seamless data exchange possible in the following ways: * on setup, profile information is fetched from the Health App if the user allows it * the user's weight (a factor in D generation) is fetched on an ongoing basis, making it unnecessary to update it * the app will write vitamin D doses, including session information into the Health app You setup basic information one time, like your height and weight and skin type and then any time you are outside, during the prescribed hours (and parts of the year), you can have it compute the amount of D you are getting in a stopwatch interface. It will also track how long you can stay out and warn you when the time is up. The application will notify you with the next opportunity to generate vitamin D. Each day, you can see forecasts based on your location, and you can also see the solar position, your generated vitamin D vs. target etc. In the Pro version, you can see your exposures's history and you will be able to schedule future events for next exposures. Weather data provided by Apple Weather. https://weatherkit.apple.com/legal-attribution.html Subscriptions: - D-Minder Pro Annual: $9.99/year (auto-renews) - D-Minder Pro Lifetime: $24.99 (one-time purchase) Payment will be charged to your Apple ID account at confirmation of purchase. Subscription automatically renews unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your account settings on the App Store after purchase. Terms of Use: https://dminder.info/terms Privacy Policy: https://dminder.info/privacy

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.

Screenshots

D Minder Pro4 screens
HeartMath4 screens

Verdict

The call

The clearest difference is rating: HeartMath at 4.9 against D Minder Pro's 4.0. HeartMath also leads on review sentiment (73% vs 34%) and ads (none vs shown). D Minder Pro's advantage is update cadence (every 2 days vs every 3 weeks) and iOS requirement (17.0 vs 26.0). On price, ratings volume, 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. D Minder Pro sells 2 one-off in-app purchases and HeartMath sells 4 in-app purchases, starting at $39.00 per year. 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 4.0. Both are backed by a comparable volume of ratings — 1.8K and 4.6K respectively. Written reviews point the same way: 34% of D Minder Pro's written reviews are positive against 73% of HeartMath's.

UpkeepUpdate frequency

D Minder Pro ships an update every 2 days, HeartMath every 3 weeks. The most recent releases landed on September 23, 2026 and September 22, 2026 respectively.

Scorecard5 real differences · 5 level
D Minder Pro versus HeartMath: the parameters behind the verdict, then further details
ParameterD Minder ProHeartMath
PriceFreeFree
Rating4.0 (1.8K ratings)4.9 (4.6K ratings) — better
Positive reviews33.8% of reviews73.1% of reviews — better
Number of ratings1.8K4.6K — better
Update frequencyEvery 2 days — betterEvery 3 weeks
AdsYesNo — better
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhone, iPad — betteriPhone
Requires iOS17.0 — better26.0
Further details — not scored
Size37 MB185 MB
Age rating12+4+
DeveloperontometricsHeartMath Inc.

Customer experience

D Minder Pro

All ratings1,757 ratings
Positive71.9%
Neutral6.3%
Negative21.9%
Written reviews674 reviews
Positive33.8%
Neutral13.4%
Negative52.8%

HeartMath

All ratings4,564 ratings
Positive96.9%
Neutral1.8%
Negative1.3%
Written reviews171 reviews
Positive73.1%
Neutral5.3%
Negative21.6%

User reviews

D Minder Pro

From 1.8K App Store ratings

What we love

  • 🚀 Useful for tracking vitamin D levels
  • 🌞 Helps with safe sun exposure
  • 👍 Accurate calculations
  • 🔋 Doesn't drain battery
  • 💡 Innovative concept

Room to improve

  • 🐛 Crashes or bugs
  • 🔍 Difficult to use or navigate
  • 🔧 Lacks customization options
  • 📊 Inaccurate data or estimates
  • 💸 Paid version not worth the cost

HeartMath

From 4.6K App Store ratings

What we love

  • 🚀 Huge improvement over previous app
  • 👍 Easy to use and highly recommended
  • 💡 Loaded with HeartMath techniques and courses
  • 👍 Powerful tool for nervous system balance and anxiety reduction
  • 👍 Helps achieve a better mental state

Room to improve

  • 🐛 Connectivity issues with sensor
  • 🐛 Sensor not compatible with older devices
  • 🐛 App crashes and freezes on newer devices
  • 🐛 Inaccurate heart rate and coherence readings
  • 🐛 Disruptive screen sleep behavior during sessions

Bugs and requests

D Minder Pro

Reported bugs

5 issues
  • App crashes on launch or during use
  • Location settings not working properly
  • Inconsistent data or calculations between devices
  • Inability to save or sync user data
  • Overcast detection not functioning correctly

Requested features

5 requests
  • Add more food options for vitamin D
  • Ability to edit past sun sessions
  • Provide more detailed reports and analytics
  • Add reminders or notifications for sun exposure
  • Allow customization of skin type and location

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

In-app purchases

2 purchases

D Minder Pro

One-time2
  • DMinder Premium$1.99
  • Lifetime Ad Removal$24.99
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

Questions

Is D Minder Pro free?
D Minder Pro is free to download, with in-app purchases available.
Is HeartMath free?
HeartMath is free to download, with in-app purchases available.
Which has better reviews, D Minder Pro or HeartMath?
HeartMath is rated higher. D Minder Pro averages 4.0 out of 5 from 1.8K ratings, while HeartMath averages 4.9 from 4.6K ratings.
Do D Minder Pro or HeartMath have ads?
D Minder Pro shows ads; HeartMath does not.
Which is updated more often, D Minder Pro or HeartMath?
D Minder Pro ships an update every 2 days, and HeartMath every 3 weeks. Most recently, D Minder Pro was updated on September 23, 2026 and HeartMath on September 22, 2026.

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