Comparison

Heartwitch vs VDO.Ninja

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

Head to head
About

Heartwitch

Stream your real-time heart rate from your Apple Watch to a web browser. Ideal for streamers who want to share their health stats during live broadcasts without extra hardware.

Highlights
  • Live stream heart rate data
  • Uses Apple Watch sensors
  • No extra hardware needed
  • Sends data to web browser
  • Independent watch app
Read full description

Show your heart rate as you live stream with this watch app! What is this exactly? Heartwitch is a combination Apple Watch and Web Application for sending your health data to a web browser window. Why would you want to send your health data to a web browser window? In the last few live years, live streams have become incredably popular and in many tense circumstances streamers want to share their health stats specifically their heart rate. For instance, speedrunners who wish to break records as to how quickly they can beat a game. With Heartwitch, there is no need for extra hardware. It simply uses the sensors on the Apple Watch to detect your heart rate and it sends it through our servers directly to your browsers. Do you save my health info? None of your health data is saved on our server. Every health stat is received by our servers from your Apple Watch and directly sent to the web browser. At no point is it saved on our end. Each workout is saved locally on your watch and stored on your devices along with your other workouts stored on your device but none of the health data is stored by us. How do I launch the app? I don't see an icon on my iPhone? Heartwitch is a completely independent watch app. Therefore there is no app for the iPhone and at this point there is no plan for one. How can I share my web browser window on a livestream? If you are using OBS to stream online, share your web browser window using the Window Capture Source. What makes this app so special? There's no need for additional hardware and using the Apple Watch health data is updated frequently.

About

VDO.Ninja

This app facilitates peer-to-peer video and audio streaming using WebRTC technology, enabling local or internet-based connections. It offers background VoIP and screen sharing capabilities not found in its web counterpart.

Highlights
  • Peer-to-peer streaming
  • WebRTC encrypted connections
  • Background VoIP support
  • Background screen sharing
  • Customizable Stream IDs
  • OBS integration
Features
Read full description

This is Peer-to-peer based, capable of working locally on a LAN or via the Internet by means of webRTC encrypted streaming technology. This is the official native iOS app version of VDO.Ninja. It has limited features compared to the web-based version that's accessible in Safari at https://vdo.ninja. The benefits of this iOS app version is it offers background VoiP support and background screen sharing support. These features are not available via the web version. To use this app: 1. Select the camera you wish to use, or select the microphone, or select the Screen share option. This will take you to the setup page. 2. All settings on the setup page are optional and can be left alone. You can enter a custom Stream ID value if you wish to*, but a default one will be provided if left blank. 3. Next, click Connect, and then allow any Cam/Mic Permissions when prompted. If using the Screen option instead, select the VDO.Ninja broadcast service when you start screen sharing. 4. Enter the URL provided at the top of the page into OBS an browser source or other any remote browser to view the video/audio stream. It will load within seconds. * Stream IDs must be alphanumeric, must not already be in use, and contain no spaces. Capitalization matters. ** If using the Screen option, instead of a selecting camera, select the VDO.Ninja broadcast service when you start screen sharing. Video guide here: https://youtu.be/iLGkGHJCpBo Permissions to allow the app to run while in the background is needed for screen sharing and background VoiP capabilities. You can refer to https://docs.vdo.ninja for information on configuring bitrate, codec, and more there. These options can be configured via the viewer-side in the browser. ie: Adding &stats to the viewer URL can show you details about bitrate, resolution, and frame rate. If you would like to have two-way calling, please access VDO.Ninja instead with Safari at https://vdo.ninja/. The web app is performant and feature rich, with the ability to join group chat.

Screenshots

Heartwitch3 screens
VDO.Ninja3 screens

Verdict

The call

The clearest difference is rating: VDO.Ninja at 3.6 against Heartwitch's 2.6. VDO.Ninja also leads on update cadence (every 11 days vs every 5 months) and review sentiment (56% vs 40%). 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

VDO.Ninja holds the better App Store score, 3.6 against 2.6. Both are backed by a comparable volume of ratings — 9 and 30 respectively. Written reviews point the same way: 40% of Heartwitch's written reviews are positive against 56% of VDO.Ninja's.

UpkeepUpdate frequency

Heartwitch ships an update every 5 months, VDO.Ninja every 11 days. Both last shipped on October 24, 2026.

Scorecard4 real differences · 6 level
Heartwitch versus VDO.Ninja: the parameters behind the verdict, then further details
ParameterHeartwitchVDO.Ninja
PriceFreeFree
Rating2.6 (9 ratings)3.6 (30 ratings) — better
Positive reviews40.0% of reviews55.6% of reviews — better
Number of ratings930 — better
Update frequencyEvery 5 monthsEvery 11 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPod, Apple WatchiPhone, iPad, iPod
Requires iOS14.8 — better15.0
Further details — not scored
Size15 MB38 MB
Age rating4+4+
DeveloperBrightDigitSteve Seguin

Customer experience

Heartwitch

All ratings9 ratings
Positive33.3%
Neutral11.1%
Negative55.6%
Written reviews5 reviews
Positive40.0%
Neutral20.0%
Negative40.0%

VDO.Ninja

All ratings30 ratings
Positive56.7%
Neutral16.7%
Negative26.7%
Written reviews18 reviews
Positive55.6%
Neutral33.3%
Negative11.1%

In-app purchases

None

Heartwitch

No in-app purchases

None

VDO.Ninja

No in-app purchases

Questions

Is Heartwitch free?
Heartwitch is free to download, with no in-app purchases.
Is VDO.Ninja free?
VDO.Ninja is free to download, with no in-app purchases.
Which has better reviews, Heartwitch or VDO.Ninja?
VDO.Ninja is rated higher. Heartwitch averages 2.6 out of 5 from 9 ratings, while VDO.Ninja averages 3.6 from 30 ratings.
Do Heartwitch or VDO.Ninja have ads?
Neither Heartwitch nor VDO.Ninja shows ads.
Which is updated more often, Heartwitch or VDO.Ninja?
Heartwitch ships an update every 5 months, and VDO.Ninja every 11 days. Most recently, Heartwitch was updated on October 24, 2026 and VDO.Ninja on October 24, 2026.

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