Henjer

One room never warms up. Another is fine the moment the door is shut. You closed a radiator valve in November and you genuinely cannot remember whether it helped.

Henjer is a logbook for a house in winter. It does not control anything and it never touches your heating hardware. It records what you noticed, what you tried, and whether it worked.

A READING TAKES SECONDS

Walk into a room and log it: the temperature, and how it actually feels — cold, draughty, comfortable, warm. That second part matters, because a room at nineteen degrees with a draught is not the same room at nineteen degrees without one.

FIXES, AND WHETHER THEY HELD

Alongside a reading, note the adjustment you tried. Closing a valve, sealing a gap, moving a rug, shutting a door. Next time you log that room, the app knows what came before, and it ranks your fixes by how often the room came back warmer afterwards. Guesswork becomes a list ordered by what actually worked.

THE SEASON AT A GLANCE

Recent readings show as small bar clusters per room, so a trend is visible without reading a single number. A cold snap and a genuine improvement stop looking alike.

FOUR PLACES TO LOOK

The diary holds every entry in order. Rooms give each space its own history. Fixes shows what you have tried and how it ranked. Settings keeps the rest.

WHO IT IS FOR

Anyone in an older or unevenly heated home: renters building a case, owners deciding whether a bigger job is worth it, and anyone tired of arguing from memory about which room is the cold one.

Fully offline. No account, no sign-in, no sync — the diary stays on your device.