Your financial entries stay with you

The calculator

Processed locally, not stored by the application

Annual household income and the selected comparison year are processed in memory in your current browser tab. The application does not store those entries, add them to the page URL, or include them in analytics events.

Personalized results are calculated locally from the public, immutable data snapshot. Closing the tab or clearing the form removes the entries from the application's working memory. Housing Time Machine does not create an account or persistent result record.

Result images

Nothing is generated or sent without your action

A personalized result image is created only after you choose to generate it. The image is rendered in your browser from an allowlist containing the selected year, public median price, rounded gross-income-years result, active snapshot label, and a verified wealth equivalent when available. It excludes your entered income, query strings, and persistent identifiers.

The application does not upload the image. It leaves your browser only if you explicitly download it or open your device's share sheet. Copying the result summary copies the selected year, rounded derived ratio, and public site address—not the income you entered.

The selected year, median price, CPI method, and rounded ratio can allow a recipient to infer an approximate income range. Generate or share a result only if you are comfortable disclosing that derived information.

Aggregate measurement

Vercel Web Analytics is enabled

Housing Time Machine uses Vercel Web Analytics to understand aggregate site use. Vercel describes this product as cookie-free and designed around anonymized, aggregate measurements. Pageview data can include the visited path, referrer, broad location, device, operating system, and browser information.

The site also records a small allowlist of property-free interaction names: calculator completed, result card generated, share started, image downloaded, and full timeline opened. These events contain no income, selected year, result ratio, wealth value, share text, or personalized URL state.

Read Vercel's official Web Analytics privacy documentation and custom event documentation.