We've conducted a study to measure the accuracy of the RealEye eye-tracking online tool. As a result, the following conclusions can be drawn:
- average accuracy is in the range from 90 to 156 px (depends on a place on the screen),
- average accuracy for all measurements is 113 px,
- accuracy range for testers (in total) varies from 60 px to over 200 px,
- the most accurate measurements are made for the middle part of the screen,
- the worst accuracy is obtained in the bottom corners of the screen,
- over half of the results have accuracy up to 100 px (and 75% up to 150 px),
- almost every result contains in the range 0 - 300 px, so we can assume higher values as gross errors,
- gross errors aren’t common and don’t affect the accuracy,
- results were obtained from different participants (random people without knowledge about how the technology works or how important it is to follow the instructions) indifferent environments like devices used, lightning conditions, head movements, etc., so they are realistic.
Read more here: RealEye Technical Whitepaper.
Please remember, that the better hardware/software your participant has, the more accurate results you'll get. Check the recommended requirements.