Browser-based rhythm analysis

From time-series data to a clear rhythm profile.

Fit the classic cosinor model, inspect phase and amplitude, and explore research-focused visualisations without installing software or writing code.

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Free to use No advertising No installation
Classic single-component cosinor Ready
Y = M + A × cos(2π × (t − φ) / T)
M MESOR A Amplitude φ Acrophase T Period

Cosinor fit

Estimate MESOR, amplitude and acrophase, with confidence intervals for selected parameters.

Polar plot

Read phase and amplitude together in an intuitive circular view.

Periodogram

Explore dominant periods with Lomb–Scargle visualisation.

New analysis

Enter your time-series data

Paste two matching columns. Your calculation starts only after you submit the form.

1 Input data
Use a dot for decimals, for example 23.9345.
A descriptive name makes saved results easier to identify later.

Paired observations

Both columns must contain the same number of numeric values.

Paste from Excel or a text file
One value per line
One value per line
Input tipUse decimal numbers only and place one observation on each line. Empty lines are ignored.
You can analyse anonymously. Create an account to save and compare future datasets.

Build a history of your rhythm analyses

Save datasets, compare multiple fits and download results from one private account.

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