Side by side
Chiasm vs PyGaze
Both stand on eye tracking software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free trial APIWeb
Chiasm is aimed at research teams that need webcam-based gaze data integrated with online studies. Review its participant device requirements, data handling, and support scope before selecting a plan.
Visit Chiasm Free plan LinuxMacWindows
PyGaze combines experiment presentation and eye-tracker functions behind one Python interface, with gaze-contingent tools included. Check the separate tracker requirements and Python recommendation before choosing it.
Visit PyGazeThe facts
| Chiasm | PyGaze | |
|---|---|---|
| Free plan | A free trial | Yes |
| Open source | Not published | Not published |
| Runs on | API, Web | Linux, Mac, Windows |
| Lowest paid plan | Starter: €199 a month | Free or on request |
| Plans published | 4 | 1 |
| Maker | Not published | Not published |
| Website | chiasm.eu | pygaze.org |
| On eye tracking software | #10 of 27 | #6 of 27 |
Chiasm: what it does well
- Returns timestamped gaze coordinates and session metadata
- Integrates with Qualtrics, jsPsych, and custom web studies
- Data can be downloaded or streamed to a researcher’s server
- Webcam video is not stored by default
What to know first
- Requires Google Chrome on a laptop or webcam-equipped desktop
- Standard support excludes study-design advice and data analysis
- No free plan; Flex costs €0.25 per minute
PyGaze: what it does well
- Free and open source.
- Supports EyeLink, SMI, Tobii, and mouse simulation.
- Works with PsychoPy and PyGame.
- Includes calibration, gaze sampling, and event functions.
- Offers gaze-contingent tools and areas of interest.
What to know first
- The about page recommends Python 2.X.
- PyLink requires SR Research registration.
- SMI and Tobii API downloads require requests to their makers.
- Fresh gaze samples arrive only at tracker sampling rate.
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