Two iPhone apps that start from the trend line
Happy Scale and Balance Point both begin with the idea that one morning on the scale says little about the direction your weight is moving. Happy Scale, made by Front Pocket Software, is available today on iPhone and iPad, and its pitch is a trend line that keeps easing downward on days when the scale refuses to move. Balance Point comes from Rival Bear and runs on iPhone and iPad with iOS 18 or later. It’s still in development and has no App Store listing yet.
How each app smooths the scale
Happy Scale lets you pick from four smoothing methods. Its support page recommends Happy Scale Smoothing, which considers weigh-ins on both sides of a date and may adjust the last few days as new weights arrive. The other three are Double Exponential Smoothing, Exponential Smoothing, and a simple seven-day average, and the page spells out where each one lags behind or overshoots. A separate 10-day-best mode puts your lowest weight of the past ten days up front, for people who count progress in new lows. Colored bands on the chart compare your current weight with where it stood 30 days earlier, and you can change that window.
Balance Point draws a single trend. It uses a statistical filter made for weigh-ins that don’t arrive on a fixed schedule, then smooths earlier history with readings that came later. A range surrounds the line and grows wider when readings get sparse. On the Today screen the trend value sits beside a weekly rate that carries its own range, for example −0.5 lb/wk ±0.5.
Looking ahead to a goal
Happy Scale’s site describes estimates built on your current trend: what you’ll weigh on a date you pick, such as a class reunion, and how many weeks remain until you hit a certain weight. It also lets you break a large goal into smaller milestone goals.
Balance Point keeps two lines apart on its chart. One is the plan, shaped by the goal and pace you picked; the other is the forecast, which uses your weigh-ins alone and is drawn as a date range. If the record can’t support a date, the app says “Not enough recent data for a date” and shows none. After a campaign has run 112 days and logged 20 weigh-ins, and once the trend visibly bends, the forecast switches to a curve that can report the trend leveling off above your goal.
When weigh-ins come irregularly
Happy Scale’s support page says weekly weigh-ins are fine, and that weighing more often improves both the smoothing and the estimates. When a day has several weights, it treats the lowest one as that day’s weight. Its site doesn’t describe how the smoothing handles a long break.
Balance Point doesn’t invent values for missing days. Estimates are computed each time a screen needs them and never saved as weigh-ins, and none of them go to Apple Health. A missed stretch shows up as a wider range around the trend for those days.
Apple Health, sync, and where data lives
By default Happy Scale stores everything on the device, and its support page says there’s no server to log into. Sync between iPhone and iPad runs through Dropbox, with access limited to Happy Scale’s own files. On iPhone it can import weights from Apple Health and export its own, recording each exported weight at noon because it doesn’t track time of day. It also offers a profile passcode and Home Screen widgets.
Balance Point asks for no sign-in and has no server behind it, and the app contains no ads or analytics. With permission it pulls weigh-ins, body fat readings, waist measurements, and nutrition totals from Apple Health, and the only values it sends back are ones you typed. The full record exports to a JSON file you can import later.
Who each app suits
Happy Scale suits someone who wants a weight tracker they can download today, with published pricing and a choice of how the line gets smoothed. It also fits people who find a 10-day-best number easier to live with than a daily trend.
Balance Point suits someone who logs whenever they can and wants the forecast’s uncertainty shown as a range, with the plan kept separate from what the data says. It also records treatments such as GLP-1 doses and daily intake totals, which Happy Scale’s site doesn’t mention. The forecast page explains how Balance Point builds its range of dates.