The Tobii Pro Nano is a small (17 cm width) remote eye tracking device. It is suitable for situations where screen width is limited (e.g., eye tracking on a small screen or tablet). However, its sampling frequency is lower than that of the Tobii Pro X3-120.

Main characteristics:
- Sampling frequency: 60 Hz
- Tracking box: 45 x 45 cm at 80 cm distance
- Gaze position accuracy: 0.3°
  (see also «Tobii Accuracy and Precision Test Report»)

Tobii Pro web site: https://www.tobiipro.com

This remote eye-tracker is intended to replace our age-old Tobii 1750. The device form factor is very similar to EyeX (a little more than 30 cm width). Infrared lights are visible. The eye-tracker usually requires a Windows computer with USB 3.0 port to operate, but could also be connected to the helpful Tobii «External Processing Unit».

Main characteristics:
- Sampling frequency: 120 Hz
- Tracking box: 50 x 40 cm at 80 cm distance
- Gaze position accuracy: 0.4°
  (see also «Tobii Accuracy and Precision Test Report»)

Tobii Pro web site: https://www.tobiipro.com

The 4C is a remote eye-tracker. The device usage is limited —by the Tobii license agreement— to eye-gaze interaction, unless you add the «Tobii Pro Upgrade Key». The 4C performances are very good for the price. The width of the device is a little more than 30 cm. Infrared lights are visible, and eye-tracker only requires an USB 2.0 port to operate and have low CPU usage. We use the 4C to prototype applications dedicated to eye-gaze interaction or instead of the X3 when preparing experiments.

Main characteristics:
- Sampling frequency: 90 Hz
- Tracking box: 40 x 30 cm at 75 cm distance
- Gaze position accuracy: unknown

Tobii Gaming web site: https://tobiigaming.com

The Fovio/FX3 is a remote eye-tracker. The main interesting feature of the system is the possibility of using up to three eye trackers simultaneously to enlarge the studied surface  (with EyeWorks Software Multi-Display Module).

Main characteristics:
- Sampling frequency: 60 Hz
- Tracking box: 31 x 40 cm at 65 cm distance
- Gaze position accuracy:  0.78°

EyeTracking web site: https://www.eyetracking.com/fx3-remote-eye-tracking/

This mobile head-mounted eye-tracker is developped by Pupil Labs. This customizable device is well suited for exploratory research projects. Moreover, thanks to the plugin-based open-source software suite provided by Pupil Labs (Pupil Capture and Pupil Player), the device can be easily interfaced with experimental research softwares. A computer (MacOS, Linux or Windows) with an USB 2.0 port is necessary to operate the device.

Main characteristics (early 2016 Pupil Core model: high speed world camera and 120hz binocular eyes cameras):
- Sampling frequency: 120 Hz
- Field of view (world camera): 60° or 100°
- Gaze position accuracy: 0.6°

Pupil Labs web site: https://pupil-labs.com

The ET1000 is a remote eye-tracker developped by The Eye Tribe company. The width of the eye-tracker is about 20 cm. An open-source Java SDK is available. The drivers are compatible with both Windows and MacOS. Moreover, the device features a standard 1/4" camera screw hole, so standard camera accessories could be used as mounting brackets. Infrared lights are clearly visible, and the eye-tracker requires an USB 3.0 port to operate. At the end of 2016, The Eye Tribe company stopped production of eye-trackers.

Main characteristics:
- Sampling frequency: 30 Hz or 60 Hz with reduction of the tracking box
- Tracking box: 40 x 30 cm at 65 cm distance and 30Hz sampling frequency
- Gaze position accuracy: 0.5~1°

The Eye Tribe web site archive: https://theeyetribe.com

Tobii 1750 is a remote eye-tracker integrated with a 17" LCD display in a robust metal case (the entire device weighs more than 10kg). Infrared lights are not visible. The eye-tracker requires a computer with USB 2.0 and FireWire 400 interfaces, and a «TETServer» software to operate. The software is only compatible with the discontinued Microsoft Windows XP and Vista operating systems. So, to facilitate experimental setups, we have dedicated a computer as processing unit for running only the «TETServer» software. The product is discontinued by Tobii but our device is still fully functional. Our «atypical» Tobii 1750 has a 33Hz (30ms period) sampling frequency, whereas other devices and specifications state that it should be 50Hz (and we do not know why!).

Main characteristics:
- Sampling frequency: 5 0 Hz (33 Hz for our «atypical» device)
- Tracking box: 30 x 16 cm at 60 cm distance
- Gaze position accuracy: 0.5°