Health Data Server vs Cens
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
Cens
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Live your best life now! By wearing one of the supported bluetooth chest heart rate sensors below, Cens:ai can show you your heart stress and heart coherence in real-time, which is a heart rate variability (HRV) measure of how harmoniously the heart is beating. Raise your coherence and lower your stress by doing coherence meditation by yourself or with friends. Track your wellbeing with daily check-ins and journal entries. DISCLAIMER: Cens:ai cannot guarantee the accuracy of heart rate measurements from the devices below because their heart rate sensors are for consumer general wellness and fitness, and therefore not subject to FDA clearance. Therefore this app cannot be used for medical diagnosis and it cannot give you medical advice. Please seek a healthcare professional if you require medical assistance. The following devices are supported: Polar H9 Polar H10 Garmin HRM-Pro Plus Garmin HRM-Dual Garmin HRM-Fit Wahoo TRACKR DISCLAIMER: Cens:ai app cannot give you medical advice or diagnosis. It does not replace your healthcare professional's advice or an appointment with your doctor. Contact urgent care immediately in the event of an emergency.
Screenshots
Verdict
The clearest difference is price: Cens at Free against Health Data Server's $4.99. Cens also leads on in-app purchases (none vs 6). Health Data Server's advantage is ads (none vs shown) and update cadence (weekly vs every 2 months). On 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
Cens 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. Cens asks for nothing beyond the download.
Health Data Server ships an update weekly, Cens every 2 months. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.
| Parameter | Health Data Server | Cens |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 4.0 (42 ratings) — better | — |
| Positive reviews | 81.8% of reviews | — |
| Number of ratings | 42 — better | — |
| Update frequency | Weekly — better | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod, Mac, Apple Watch — better | iPhone, iPod |
| Requires iOS | 14.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 27 MB | 719 MB |
| Age rating | 4+ | 4+ |
| Developer | Aaron DeLory | Evolve Biologix Inc. |
In-app purchases
Health Data Server
- HDS Cloud Monthly7 Days trial$2.991 Month
- HDS Cloud Yearly$29.991 Year
- Small Tip$0.99
- Medium Tip$2.99
- Large Tip$4.99
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- Make Up the Difference$49.99
Cens
No in-app purchases









