The open-source EEG visualizer
A rapid, transparent, open-source analytics tool for EEG recordings.
How it works
A free tool to visualize your EEG
01
Upload EEG
Upload your EEG files to perform secure, online analysis for free. Supports .EDF, .CSV, and .JSON formats.
02
Visualizer
Visualization for raw EEG files gives you the ability to quickly inspect recordings.
03
Quantitative Analysis
Provides amplitude, symmetry, coherence, LZC, and known risk assessments based on EEG.
100%
Free to use
100%
Open source
5 modes
Basic analysis
Transparent
All design & code public
About Squiggly
Alex started developing Squiggly in November 2025, disappointed that no free, open-source EEG visualizer and analyzer was available to run on the cloud. There are good desktop-based EEG visualizers, both paid and free — but the need for an easy-to-use, barrier-free online tool that can be accessed anywhere prompted him to take action.
Keep EEG visualization & analysis open
Passionate about EEG and have skills? Consider contributing to keep EEG visualization and analysis open and free. In a world filled with secrets, transparency and openness matter.
Get involved