Tare - Weight Trend

Your weight on any one morning is mostly water, salt and what you ate the day before. It can swing a kilo or two between days when nothing about your body fat has changed. Tare smooths that swing away and shows you the trend underneath — the number worth comparing with last month.

What it does

The trend, large, as the one number on the home screen. Today's reading is a caption under it, and can be hidden entirely.

The pace over the last four weeks, with its uncertainty stated rather than hidden: "likely 0.30 to 0.69 kg a week".

A forecast to your goal as a date range, never a single date. The chart draws it as a cone that widens the further ahead it goes, because that is the honest shape of a forecast.

Milestones as dated records, measured on the trend, so one dry morning cannot pass one.

A maintenance range once you arrive, with drift reported only after seven days outside it — and reported in the same words whether you drift above or below.

Notes on the chart, with quick words for the things that swing a reading: travel, unwell, period, salty meal, alcohol, poor sleep, fasting.

A daily reminder that stays quiet on days you have already weighed in.

Health Connect import (Android 14 and later), so a connected scale's readings arrive on their own. Read only; nothing is ever written back.

A home-screen widget with the trend and this week's change, and a one-tap record.

A PIN lock that shows nothing behind it.

Unlock with fingerprint or face, with the PIN always there as well.

An optional garden: plants grow with weekly check-ins (water, a walk, fruit or veg, a plan for the next day). No streaks, nothing can be lost, never a reward for a weight, and it stays off unless you turn it on.

Kilograms, pounds, or stones and pounds. Light and dark. Large text.

A "How this works" page that explains the maths in plain words, with the real numbers.

What it will not do

It will not count how many days in a row you have weighed in, reward a weight, or cheer. It will not hold up your lowest reading of the week as a number to beat. It will not describe weight below your goal as progress, and it will not accept a goal that puts you underweight. It will not mention a gap in your weigh-ins except as a fact.

Your data

Everything stays on your phone. There is no account, no server, no analytics, no ads, and the app has no internet permission. Your weigh-ins are included in your phone's own backup, and you can export them as a plain CSV whenever you like, or read one back in.

On Android 14 and later, Health Connect can bring in the readings a connected scale or another app has already recorded, so your trend starts with your history rather than from today. Weight and height only, read only, and never sent anywhere.