Comparison

Health Data Server vs InnerSync Pro

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

Head to head
About

Health Data Server

Stream real-time health data from your Apple Watch to your overlay. Display heart rate, calories, and more with customizable animations and sounds. Save workout data to Apple Health.

Highlights
  • Stream heart rate from Apple Watch
  • Display calories burned
  • Customizable overlay appearance
  • Heartbeat animation and sound
  • Save workout data to Apple Health
  • Access extensive HealthKit data
Features
Read full description

The watch app requires watchOS 8+ This app was built to get heart rate, calories, and more from your watch into a stream overlay. It does this by sending the data to HDS Cloud (or an IP address/port you specify). A website hosted at hds.dev can be used as a browser source in OBS to show the data. This app can save workout data to Apple Health Features: - Show your heart rate on stream with just an Apple Watch. No extra heart rate monitors required. - The app will only affect your Activity Rings if calories are enabled - Heart rate color ranges. Know where your heart rate is at a glance. - The overlay app comes with a plethora of customization options. Make your overlay look however you want. - The overlay comes with a heart beat animation that matches your real heart rate - The overlay can also play sounds to go along with the heart beat animation - Even more data for advanced users: - Motion - Every single HKQuantityTypeIdentifier available in HealthKit (so pretty much anything) Go to https://github.com/Rexios80/hds_overlay for information on how to set up the overlay.

About

InnerSync Pro

Features
Read full description

InnerSync Pro. Cardiac coherence in the hands of professionals. You're a practitioner, coach, therapist, or healthcare professional. Your clients count on you for concrete results, not just an impression. InnerSync Pro equips you for exactly that: reliable measurements, clear tracking, precise guidance. Connect a Bluetooth heart sensor. Start a session. Within minutes, you hold a complete, clear analysis in your hands, ready to use with your client right away. DESIGNED FOR YOUR PRACTICE Your entire client base, organized and instantly accessible. Complete history and progress tracking for every client. Your clients get involved: they share their sessions, you follow their progress. Trend graphs to visualize the journey. Session comparison to measure progress. PROFESSIONAL ANALYTICS Tachogram: every beat, every variation. Spectrogram: the autonomic nervous system's evolution over time. Automated interpretations and personalized recommendations. The app translates complexity into clear, actionable insights. ENGAGING SESSIONS Visual, calming breathing guidance. Real-time feedback on coherence quality. Automatic artifact detection. Your data stays reliable. DR DAVID O'HARE TRAININGS Cardiac coherence trainings designed and led by Dr David O'Hare, a physician and world-renowned expert. Learn, refine your skills, certify your approach. Optimized for iPhone and iPad Your data and your clients' data: protected, secure, yours. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.innersync.io/en/privacy-policy

Screenshots

Health Data Server1 screens
InnerSync Pro4 screens

Verdict

The call

The clearest difference is price: InnerSync Pro at Free against Health Data Server's $4.99. InnerSync Pro also leads on in-app purchases (none vs 6). Health Data Server's advantage is update cadence (weekly vs every 2 months). On ads, device support and iOS requirement 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

InnerSync Pro is free to download; Health Data Server costs $4.99 up front. Health Data Server sells 6 in-app purchases, starting at $2.99 per month. InnerSync Pro asks for nothing beyond the download.

UpkeepUpdate frequency

Health Data Server ships an update weekly, InnerSync Pro every 2 months. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.

Scorecard3 real differences · 7 level
Health Data Server versus InnerSync Pro: the parameters behind the verdict, then further details
ParameterHealth Data ServerInnerSync Pro
Price$4.99Free — better
Rating3.9 (41 ratings) — better—
Positive reviews81.8% of reviews—
Number of ratings41 — better—
Update frequencyWeekly — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPod, Mac, Apple Watch — betteriPhone, iPad, iPod
Requires iOS14.0 — better15.1
Further details — not scored
Size27 MB62 MB
Age rating4+4+
DeveloperAaron DeLoryAGS SRL

In-app purchases

6 purchases

Health Data Server

Subscriptions2
  • HDS Cloud Monthly7 Days trial$2.991 Month
  • HDS Cloud Yearly$29.991 Year
One-time4
  • Small Tip$0.99
  • Medium Tip$2.99
  • Large Tip$4.99
Show 1 more
  • Make Up the Difference$49.99
None

InnerSync Pro

No in-app purchases

Questions

Is Health Data Server free?
Health Data Server costs $4.99, and also offers in-app purchases.
Is InnerSync Pro free?
InnerSync Pro is free to download, with no in-app purchases.
Do Health Data Server or InnerSync Pro have ads?
Neither Health Data Server nor InnerSync Pro shows ads.
Which is updated more often, Health Data Server or InnerSync Pro?
Health Data Server ships an update weekly, and InnerSync Pro every 2 months. Most recently, Health Data Server was updated on October 15, 2026 and InnerSync Pro on October 13, 2026.

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