Short version: the fitter runs in your browser, and your data stays there.
The DoseFit fitter is a single page of code that runs entirely on your own device. When you paste (dose, response) data and press fit, the calculation — the 4PL fit, the bootstrap confidence intervals, the chart, the PNG/SVG export — all happens locally in your browser. Your data is never uploaded, transmitted, or stored on any server. Closing the tab clears it.
The “Compare to literature” feature is the only part of the fitter that reaches the network, and only
when you click Fetch published values. It sends a target identifier (for
example CHEMBL218) and a measure type (IC50/EC50/Ki) to the public
EBI ChEMBL database to
retrieve published reference values. None of your own data is included in that request.
If you never use the feature, the fitter makes no outbound requests at all.
The fitter has no login, sets no cookies, and contains no analytics or advertising trackers. It does not build a profile of you. (As with any website, the server that hosts these pages may keep standard access logs such as IP address and page requested — that is ordinary web hosting, not DoseFit collecting your science.)
The free fitter is covered above. The forthcoming Pro and Compliance tiers will, by design, store the methods, runs, and reports you choose to save — that is the point of an account-based system of record — and will come with their own clear data terms before you ever sign up. Nothing is stored on your behalf today.
Email hello@dosefit.app and we'll answer plainly.