Head Tracker vs ETPhone
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Head Tracker
This app provides responsive 6DOF head tracking for PC games using your iPhone's camera. Enjoy immersive flight and driving simulations without expensive hardware or uncomfortable headsets.
- 6DOF head tracking
- Wireless Wi-Fi connection
- No external hardware needed
- Accurate and responsive tracking
- Easy setup
- Compatible with opentrack
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Head Tracker uses iPhone’s front-facing TrueDepth camera to provide responsive and accurate 6DOF (degree of freedom) head tracking input to opentrack. Allowing users to enjoy flight and driving simulation games without expensive hardware or wearing uncomfortable headsets. ================================== Supported Devices (iPhone 11 and newer) ================================== This app requires device with TrueDepth camera or Devices with A12 or later processors: iPhone 11, iPhone SE(2nd Gen), iPad (8th Gen), Pro (2nd Gen) and later are supported. ================= Features ================= - 6 DOF - Connects over wifi network, no need for cables - No need to wear any uncomfortable head tracking headsets - Accurate and responsive (up to 60fps) - simple to setup ================================== opentrack supported games includes: ================================== - Microsoft Flight Simulator - FSX - DCS World - Star Citizen - Elite: Dangerous - IL2 - Euro Truck - and more. ================= Customer Reviews ================= "Installation took a couple of minutes on the PC and after the latest update is now smooth as butter. Looking forward to more improvements! Works perfectly on Euro Truck and other racing sims I play like Assetto Corsa etc" "I sold my TrackIR headset some years ago and missed it now in the new Flight Simulator - and guess what: this is combined with opentrack the ideal replacement. It “just works” and is easy to set up. Fair pricing. 5 stars. Thank you, John." ================= How to use: ================= - Open Head Tracker app on your iPhone, set your PC's IP address, then start - Launch opentrack application on your PC, select "Network over UDP" and the "freetrack 2.0" protocol, and press start - Start your favourite simulator game, it will now follow you head movements in the virtual cockpit. Visit https://jbcconsulting448679429.wordpress.com/head-tracking-quick-start/ for detailed instructions and download opentrack preset profile. ================================== Versions (Free and in-app purchase) ================================== Try out the free version. The free version allows you to play for 10 minutes per session, you can restart to extend the trial. Upgrade to the full version via in-app purchase to remove trial limit and automatic screen dimming to reduce battery usage. ================================== More Information and Support ================================== Visit https://jbcconsulting448679429.wordpress.com for more tips, network setup and troubleshooting instruction on configuring head tracking, and contact me for support.
ETPhone
This application enables real-time gaze computation and recording for eye tracking data collection using a compatible wearable device. It offers control over camera settings, participant calibration, and data recording to an SD card. Collected data can be easily transferred for detailed analysis on a PC.
- Real-time gaze computation
- Gaze data recording
- Camera gain and quality control
- Participant calibration
- SD card recording control
- Data download for PC analysis
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Argus Science is pleased to release the latest version of the ETPhone App for use with the Argus Science ETVision wearable eye tracker. This Release builds upon the original ETPhone App by adding real-time gaze computation and recording directly on your iOS Phone or Tablet, allowing increased flexibility and control for eye tracking data collection. With this latest ETPhone Release you may name files, control gain and quality of the ETVision cameras, calibrate participants, record gaze data and control recording to an SD card inserted in the ETVision controller. After data is collected, it is easy to download the gaze data to a PC with Argus Science’s ETAnalysis program which allows the researcher to perform typical gaze analysis functions such as Fixation definition, Pupillometry and blink criteria as well as automated area of interest creation to name a few.
Screenshots
Verdict
The clearest difference is review sentiment: Head Tracker at 70% against ETPhone's 0%. Head Tracker also leads on rating (4.1 vs 3.0) and update cadence (fortnightly vs every 16 months). ETPhone's advantage is in-app purchases (none vs 1). On price, 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
Both are free to download. Head Tracker sells 1 one-off in-app purchase. ETPhone asks for nothing beyond the download.
Head Tracker holds the better App Store score, 4.1 against 3.0. That said, the two scores are not equally well evidenced: Head Tracker has 62 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 70% of Head Tracker's written reviews are positive against 0% of ETPhone's.
Head Tracker ships an update fortnightly, ETPhone every 16 months. The most recent releases landed on August 18, 2026 and September 8, 2026 respectively.
| Parameter | Head Tracker | ETPhone |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (62 ratings) — better | 3.0 (6 ratings) |
| Positive reviews | 70.5% of reviews — better | 0.0% of reviews |
| Number of ratings | 62 — better | 6 |
| Update frequency | Fortnightly — better | Every 16 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 — better | 16 |
| Further details — not scored | ||
| Size | 2 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | John Yu | Argus Science, LLC |
Customer experience
Head Tracker
ETPhone
Bugs and requests
Head Tracker
Reported bugs
10 issues- Pitch flips upside down when yawing
- Purchase not restoring after reinstall
- Camera always in portrait mode
- Image gets dark after a few seconds
- Tracking is shaky and buggy
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- Connection drops and won't reconnect
- Does not work with iPhone SE
- Does not work with iPhone 7
- Does not work with iPhone 8
- Roll axis detects other axis components
Requested features
5 requests- Option to turn off screen when tracking
- Always visible rotation button for landscape camera
- Ability to brighten screen for better tracking
- Use IR camera for low-light conditions
- Option to make screen black to reduce battery/screen burn
ETPhone
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Head Tracker
- Full Version$1.99
ETPhone
No in-app purchases









