HeartMath vs Project Function
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Real-time HRV Coherence Measurement
- Coherence Training
- Scientifically Validated Techniques
- Guided Learning Sessions
- Progress Tracking
- Heart-Brain Coherence Benefits
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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.
Project Function
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With the Project Function App, you can check in to our facility, manage your membership details, and book appointments. - Access digital membership pass - Book appointments and view session balance - Edit personal information and view membership details - Stay up-to-date with announcements from us! Download the app today! Features connectivity to Apple Watch (synced to HealthKit app)
Screenshots
Verdict
The clearest difference is in-app purchases: Project Function at none against HeartMath's 5. Project Function also leads on device support (4 vs 1) and iOS requirement (15.5 vs 26.0). On price, update cadence and ads 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. HeartMath sells 4 in-app purchases, starting at $39.00 per year. Project Function asks for nothing beyond the download.
HeartMath ships an update every 3 weeks, Project Function every 6 weeks. The most recent releases landed on September 25, 2026 and September 22, 2026 respectively.
| Parameter | HeartMath | Project Function |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (4.6K ratings) — better | — |
| Positive reviews | 73.1% of reviews | — |
| Number of ratings | 4.6K — better | — |
| Update frequency | Every 3 weeks — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 26.0 | 15.5 — better |
| Further details — not scored | ||
| Size | 185 MB | 181 MB |
| Age rating | 4+ | 4+ |
| Developer | HeartMath Inc. | Project Function LLC |
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
Project Function
Not enough reviews yet to summarise bugs or requests.
In-app purchases
HeartMath
- HeartMath Premium7 Days trial$39.001 Year
- HeartMath Premium7 Days trial$59.001 Year
- HeartMath Premium7 Days trial2 variants$79.001 Year
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- HeartMath Premium7 Days trial$99.991 Year
Project Function
No in-app purchases
Questions
Is HeartMath free?
Is Project Function free?
Do HeartMath or Project Function have ads?
Which is updated more often, HeartMath or Project Function?
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