Tobii Pro Fusion

Screen-based eye tracker, capturing gaze data at speeds up to 250 Hz. Our next generation of compact high-performance eye trackers, this powerful research system supports from fixation to saccade based research outside of the lab.


Reach further with your research

Tobii Pro Fusion is the next generation of compact high-performance eye trackers from Tobii Pro.

Take your research to subjects that would otherwise be hard to bring to the lab. Collect data in schools, hospitals, libraries, and other locations where participants are easier to access.

With sampling frequencies of up to 250 Hz, two eye tracking cameras, and two pupil tracking modes (bright and dark pupil), Pro Fusion enables you to adapt your data collection setup to different research populations, scenarios, and data requirements.

View the Specifications and Data Quality Test
Reports for Pro Fusion


What’s new in a compact format:

  • More detailed data with sampling frequencies of up to 250 Hz.
  • More tolerance for head movement with two new eye tracking cameras and improved eye tracking algorithms.
  • No external processing unit required which ensures timing consistency as the data is processed autonomously in three internal processors.
  • Support for new PC ports: USB Type-C.
  • Pupil size data reported at the selected sampling rate.
  • Eye images provided.

“Our study participants are people with Autism Spectrum disorders or Schizophrenia where having an eye tracking system that is unobtrusive and allows for head movement is imperative. The dual eye tracking cameras, sampling rate and discreet design with Tobii Pro Fusion will open up the possibilities for more extensive research on our demographic"

Dr. J. Adam Noah, Yale School of Medicine, Brain Function Lab

Collect your data where your subjects are available

Recruiting test subjects is an obstacle all researchers face. Certain test populations are more difficult to recruit and test in the lab and some individuals might even feel uncomfortable in this environment.

The size and shape of Tobii Pro Fusion allow you to put together a compact mobile lab which enables you to take your data collection to where your subjects are available and feel more comfortable, without compromising on data quality and granularity.

The patented Tobii eye tracking algorithms and robust subject calibration ensures that the eye tacker produces reliable data across different indoor environments.

testing subject with eye tracker in Lab

“You want to collect the data in an environment where children feel most comfortable while trusting that you return to the lab with accurate data to answer you research questions. I’m excited to incorporate Tobii Pro Fusion to our research toolbox and see how it can help us take our research even further”

Julian Schmitz, Professor at the Leipzig Research Center for Early Child Development, University of Leipzig

Support for different data collection scenarios

If you have a busy lab with students running different projects, it’s likely that each project will have different demands on the eye tracking setup. Tobii Pro Fusion provides a flexible solution that supports different research scenarios and study designs.

Pro Fusion has a slim design that integrates well with different stand-alone and laptop screens up to 24 inches in size. The eye tracker can also be mounted on tripods and coupled with a scene camera so it can be used in study setups that use real-world stimuli such as physical objects or scenes.

The sampling speed of up to 250 Hz allows you to capture data for a wide range of experimental paradigms (fixation, smooth pursuit, and saccade based).

The different sampling frequencies and associated bright and dark pupil tracking modes allow you to adapt the performance to your study design and test population.*

The Tobii Pro Eye Tracker Manager – a configuration and setting utility – guides you through the setup procedure and manages different setup configurations. This application is available free of charge.

*The illumination mode is selected automatically by the system during calibration.

fusion eye tracker in lab environment

High standards of data quality

The Tobii Pro Fusion eye tracker is designed to provide high data quality and tracking robustness:

  • Two custom Tobii-designed cameras optimized for eye tracking. Tobii’s patented 3D eye model delivers superior gaze data, including wide gaze angles and all corners of the screen.
  • Bright and dark pupil illuminators for NIR light, offer superior tracking robustness regardless of eye shapes, ethnicity or age.
  • Fully embedded processing and illumination control enables the system to work autonomously, minimizing load on system CPU.
  • The system maintains high accuracy, precision, and tracking robustness during subjects' natural head movements and in different lighting environments indoors.

Tobii Pro Lab

Tobii Pro Fusion works with Tobii Pro Lab providing a visual user interface and dedicated software features that guide and support the researcher through the different phases of data collection and processing during an eye tracking experiment – from stimulus setup and test recording to preparing the data for further analysis.

You can create different experiments, collect eye tracking data, observe and analyze individual recordings, and aggregate data for quantitative analysis and visualization.

Pro Lab is built on a platform that ensures precise and consistent timing accuracy. You can rely on full transparency - with access to both the gaze data and processed eye movement data (fixation filters), as well as insights into metric calculations.

Read more about how raw data is classified into eye movements in Pro Lab.

Pro Lab can also be used to sync eye tracking data with other biometric data streams such as EEG, GSR, and EKG.

Learn more about Tobii Pro Lab

data analysis of eye tracker

Tobii Pro SDK

The Tobii Pro SDK provides a comprehensive toolkit for researchers and partners who wish to develop analytical applications or scripts to use with the Pro Fusion and other screen-based eye trackers from Tobii Pro.

This SDK provides access to the full set of advanced gaze data streams that are relevant to your research, while advanced timing support compensates for time differences in real-time, between the eye tracker and the computer running the SDK application, providing high synchronization accuracy.

The Tobii Pro SDK offers multi-platform support (including the latest versions of Windows, Linux, and Mac) and API bindings for several programming languages (.NET, Python, and Matlab).

Learn more or download the Tobii Pro SDK free of charge

Curious to learn more about...

Tobii Pro Fusion?

Request a short demo, where you can see it in action. One of our Sales consultants will explain key features and you will get an opportunity to ask any questions about Tobii Pro Fusion.

Request a free online demo

Eye tracking methodology?

Watch our recorded webinar, where you will get practical advice on how to successfully perform data collection with eye tracking. We will guide the way from research question to meaningful results.

Watch the webinar


Eye tracker unit

The eye tracker measures 374 mm (14.7'') in length and weighs 168g (5.9 oz.). It attaches to screens up to 24" (16:9) with supplied adhesive mounting brackets for monitors and laptops. Mounting solutions for larger projections or real-world objects are offered as accessories.

Fusion eye tracker


Eye tracking specifications

Eye tracking technique 

Video-based pupil- and corneal reflection eye tracking with dark and bright pupil illumination modes.1
Two cameras capture stereo images of both eyes for robust accurate measurement of eye gaze and eye position in 3D space, as well as pupil diameter. 

Sampling frequency 

30, 60, 120, 250 Hz (max. frequency depends on hardware version)


0.04° RMS at optimal conditions3
0.2° RMS in optimal conditions (raw signal)


0.3° in optimal conditions

Binocular eye tracking 


Monocular calibration Yes
Hardware versions 60Hz

Eye tracker latency

Mean latency < 13 ms @ 250 Hz (SD < 1.2 ms)

Blink recovery time 

1 frame (immediate) 

Gaze recovery time 

250 ms 

Data sample output4

Gaze origin
Gaze point
Pupil diameter

Eye image data stream 

Eye image data stream frequency is approximately 4 Hz (one image per eye). Zoomed-in eye images available in tracking mode. Full-frame camera images are available in gaze recovery mode.

TTL input stream

Not Available

Tracker and client time synchronization 

Integrated between the eye tracker time domain and the client computer time domain.

Operating system Windows, Mac, Linux

1Dark pupil tracking is supported in all sample frequencies. Bright pupil tracking is supported at 60 and 120 Hz.
2Tobii Pro uses an extensive test method to measure and report performance and quality of data. Please download the Data quality test report for more detailed information.
3Applying Savitzky-Golay filtering (settings in Tobii Pro Data quality test report)
4For the complete list of available data and the supplementary data stream, download the Pro SDK documentation.

Tobii Pro Fusion eye tracker data quality test reports

Set up

Head movement tolerance Excellent -Dual-camera system, with more images than a one camera system, gives a more accurate data calculation and the best level of precision and robustness for head movement.
Freedom of head movement5 (at 65cm distance) Width × height: 40 cm × 25 cm (15.7" × 9.84")
Freedom of head movement5 (at 80cm distance) Width x height: 45 cm x 30 cm (17.7" x 11.8")
Operating distance
(mounted on screen)
50–80 cm (19.69”–31.49”) from the eye tracker
Tracker setup options Tracker mounted at tripod, allows for even larger screens and physical objects to be tracked.
Optimal screen size 24” (16:9 aspect ratio)


5Describes the region in space where the participant can move his/her head and still have at least one eye within the eye tracker’s field of view (trackbox) at the specific distance.

Software and framework compatibility

Software and framework compatibility Tobii Pro Lab
Tobii Pro Eye Tracker Manager
Tobii Pro SDK
Any application built on the Tobii Pro SDK
Operating system Windows, Mac, Linux



Hardware versions

Hardware versions 60Hz

Eye tracker unit


(L x H x W) in cm/inches 37.4 × 1,8 x 1.37 (14.72" × 0.70" × 0.53")


168g (5.9 oz.) 


USB Type-C,
USB Type-C to USB Type-A adapter
AC power

Data Processing

3 Tobii EyeChip™ ASIC with fully embedded data processing

Eye tracking cameras



Dark pupil Illumination Modules, Bright pupil Illumination Modules

Power consumption 

Typical power consumption: 4.3 W
Max. rated power consumption: 9 W

Power options 

Directly via USB Type-C connector, or
With provided AC power adapter, when using a computer with USB 2.0 Type-A port

Comparison tables


Pro Nano

Pro Fusion Pro Spectrum

RMS at optimal conditions3

RMS at optimal conditions2

RMS at optimal conditions (raw signal)

RMS at optimal conditions2

RMS at optimal conditions (raw signal)

Accuracy 0.3° 0.3° 0.3°
Head movement tolerance Good
(Single Camera)
(Dual camera)
(Dual camera)
Tracker setup options Tracker mounted at tripod, allows for even larger screens and physical objects to be tracked. Tracker mounted at tripod, allows for even larger screens and physical objects to be tracked.

1 Tobii Pro uses an extensive test method to measure and report performance and quality of data. Please download the Data quality test report for more detailed information.

2Applying Savitzky-Golay filtering (settings in Tobii Pro Data quality test report)

3Using built in filtering.

  Pro Nano Pro Fusion Pro Spectrum
Optimal screen size Up to 24” 1 24” 24”
Freedom of head movement
width x height @ 65cm distance (either eye)
35 x 30cm 40 × 25cm 34 x 26cm
Freedom of head movement
width x height @ back of headbox (either eye)
45 x 45cm2
45 x 30cm
42 x 26cm
Operating distance
(cm in Z direction)
45 - 85cm 50-80cm 55-75cm
Head movement tolerance Good Excellent Excellent

1For larger screens, the limiting parameter is the quality of the gaze accuracy at the upper corners of the screen when the user sits close to the screen
2Cone/circular shaped

Learn and support

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Fields of Use

Psychology and Neuroscience

Eye tracking is used in different fields of psychology and neuroscience to understand how and why eye movements are made and how we gather information with our eyes. Read more

Infant and Child Research

Infant and child researchers use eye tracking to study perceptual, cognitive, and social-emotional development from birth through early adulthood. Read more

Clinical Research

Researchers are seeking to find meaningful analysis of eye movement information to accurately identify and treat ocular disease and disorders such as autism, ADHD, Parkinson’s disease and more.  Read more