OmniUnit is a unit converter that runs entirely in your browser. When you type a number and pick two units, the conversion is computed locally on your device — your conversion values are never uploaded to a server, and there is no account system to attach them to. OmniUnit does not ask for your name, email, or any personal information.
To understand how the site is used, OmniUnit collects anonymous usage analytics (via ZoAnalytics): page views and feature events such as which units are selected. These events do not include the numbers you convert. Client-side error reports may include the page URL and error details to help fix bugs.
Because your conversion values never leave your device, there is nothing to delete or export: closing the tab removes all trace of your session.