Observed arrival · 2026-08-25

Heart Heater: A Private Thermometer for Relationships

heartheater.com Observed source

Editorial interest 84/100 Selection signal · not a rating of the site

A local-first app for recording contact with important people and noticing how relationship rhythms change over time.

Landing page captured for the 2026-08-25 issue.

Field notes

The app records contact with selected people, supports optional notes, and turns the resulting history into a changing “heart temperature” based on interaction rhythm. Its stated local-first design keeps data in the current browser or on the device, with export and restoration initiated by the user rather than automatic synchronization. The page also exposes an Android APK listed at 102 MB, alongside a browser beta and a demonstration entry showing a 78° reading.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

ƒJavaScriptBrowser-side code central

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