Your health story should stay yours.

Permission before access

Trendline asks for access only to compatible Apple Health categories used to provide the experience. You can grant, deny, or later revoke access by category.

Interpretation on your device

Imported Health data is processed on your device. Trendline does not run an advertising profile, sell health data, or upload Apple Health readings to this website.

Nothing changes silently

Trendline never writes to or deletes from Health automatically. A manual measurement writes only after you choose Save and Apple authorizes sharing. A clinic-scan Save attempts only compatible body-fat and lean-mass writes. Undo and confirmed deletion can remove only Health samples that Trendline wrote—not samples from your scale or another app.

Stored locally, not synced by Trendline

App-owned readings and clinic scans are stored on this iPhone and may be included in your iPhone backup. Trendline does not send them to CloudKit or operate an iCloud sync service. Export and sharing require your deliberate action, and the destination you choose controls the copy it receives.

A quiet website too

This site has no visitor account, ad pixels, or cross-site tracking. Aggregate Cloudflare Web Analytics may be used to understand page performance without cookies or individual profiles. The optional launch list stores an email only after an explicit form submission and does not activate until the mailbox confirmation link is used.

Read the full privacy policy and manage your choices.