Trendcurve: the weight tracker app that shows your trend

Your weight swings by up to two kilos (four pounds) from day to day, because of water, salt and digestion. Trendcurve smooths out that noise into a calm trend and shows you where you are really heading: for iPhone and Android, free, no account.

Free on the App Store Free on Google Play
5.0 out of 5 · 4 ratings on the App Store For iPhone and Android · no account · readings stay on device
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  • Used in over 30 countries
  • Over 8,000 measurements analysed
  • Over 600 weigh-ins logged in October alone

As of October 2026. Anonymous app usage statistics, excluding internal test devices. The analysed measurements include history imported from Apple Health and Health Connect.

What Trendcurve does for you

Everything revolves around one question: where is your weight really heading?

  • Trend instead of daily value

    Trend weight, 7-day change and weekly rate instead of a zigzag. Four methods to choose from: exponential smoothing, 7 or 14 day average, double exponential.

  • Logged automatically

    Reads your weight from Apple Health or Health Connect. You can of course enter it by hand too, in kg, lb or st.

  • Goal and pace

    Lose, gain or maintain, with a target pace and a warning if you go too fast. With Pro, the forecast shows your expected goal date.

  • Medication tracking

    Dose markers and a weekly injection reminder, for example with GLP-1. With Pro, the weekly rate per dose step. No recommendations, not a medical device.

  • Experiments

    Less sugar, more steps, no alcohol: set up experiments and, with Pro, see your weekly rate before and after.

  • Switch in minutes

    Imports CSV files from Happy Scale, Libra, openScale and Excel. Export as CSV and JSON, always free.

This is what Trendcurve looks like

Five looks inside the app: trend, goal, medication tracking, experiments and everything else.

See the trend, not the daily noise: the Today tab with a trend weight of 171.8 lb, 0.8 lb lighter than a week ago, and a 3 month chart showing the experiment "Less sugar" and a dose step as bands.
When will you reach your goal? Forecast in the Goal tab: losing weight to 154.3 lb, expected on February 25, 2027, in 133 days, range Feb 18 to Mar 4.
On medication? Your trend per dose: the weight trend over 3 months, exponentially smoothed, with the experiment "Less sugar" and the 5.0 mg dose step as bands in the chart.
Find out what works for you: the Experiments card in the Analysis tab, with a weekly rate of -1.10 lb before and -0.80 lb after for the dose step, and -0.19 lb before and -0.94 lb after for the experiment "Less sugar".
Everything your trend can tell you: Apple Health, maintenance mode with a corridor, calorie budget, milestones, free sharing as an image and widgets.

What users say

Voices from the App Store and Google Play, from people who use Trendcurve every day.

  • Great analysis

    “The charts really helped me see when and why I was losing weight too slowly. Very cool”

    Rene.Asse App Store · Germany · translated from German · App Store DE View in store

  • “Great overview, a weight tracker that's worth the money”

    Rene A Google Play · Germany · translated from German · Google Play DE View in store

  • Super clear

    “The app shows precise trend analyses and when you'll reach your goal weight, and makes sure you're losing weight neither too slowly nor too fast. I recently started using Premium and it's totally worth it for the small price”

    christina.1987 App Store · Germany · translated from German · App Store DE View in store

  • Top info, very well presented!

    “I got to join the beta and with Trendcurve I could finally lose weight without stress. The app shows very clearly when you'll reach your goal weight and how to get there quickly and still healthily. So far -8 kg on the scale and soon at my goal💪”

    Tina.Peters App Store · Germany · translated from German · App Store DE View in store

Selected reviews of 4 stars and up from the App Store and Google Play, unabridged. See the store for the overall rating.

All reviews on the App Store Trendcurve on Google Play

Start free, go Pro if you want

Trend, goal, history, Apple Health, export and the medication reminder are free. Pro adds the forecast, analyses and backup.

Free

  • Log weight, Apple Health / Health Connect, import
  • Units kg, pounds or stones
  • Trend weight, 7-day change, history
  • Pick your trend algorithm
  • Ignore a reading
  • Chart ranges: 1 & 3 months
  • Goal, progress & target pace
  • Milestones: Celebration & sharing
  • Create experiments & markers
  • Medication tracking: dose markers & reminder
  • Maintenance corridor: band in the chart & status
  • Share trend & milestones as an image
  • Export CSV/JSON & import
  • Widgets (iPhone): Small home widget
  • Reminders: One time, smart, measurements, injection day, experiment end
  • Price: Free

Pro

  • Chart ranges: plus 1 year, 3 years & all time
  • Forecast with target date, planned vs measured
  • Calorie budget from your trend
  • Patterns: plateau, weekdays
  • Milestones: plus ladder with dates
  • Balance & monthly reports
  • Body measurements
  • Progress photos
  • Experiment results: before, during, after
  • Trend restart
  • Weekly rate per dose step
  • Corridor history & early warning
  • iCloud backup (iPhone)
  • Widgets (iPhone): plus medium & lock screen
  • Reminders: Several times & streak protection
  • Price: Monthly, yearly or one time

Pro is available as a monthly subscription, a yearly subscription with a 7 day trial, or a one-time purchase. The store in your country shows you the price.

Trendcurve compared

Already using another app? Here is how Trendcurve differs, with a guide to moving your data.

Trendcurve vs. Happy Scale

Happy Scale runs on Apple devices only. Trendcurve is also available for Android and takes over your Happy Scale CSV.

See the comparison

Trendcurve vs. Libra

Libra relies on an account and cloud sync. Trendcurve stores data locally, without an account, and takes over your Libra CSV.

See the comparison

Trendcurve vs. MacroFactor

MacroFactor is a nutrition coach with food logging. Trendcurve focuses on your weight trend, free and without an account.

See the comparison

All comparisons

Questions about the app

A weight trend app doesn't just show what the scale says today. It smooths out the daily swings from water, salt and digestion into a trend, so you can see whether you are really losing, gaining or maintaining. Trendcurve does exactly that, automatically from Apple Health or Health Connect.

Yes. Logging, trend weight, 7-day change, history, goal with progress, the medication reminder, creating experiments and export are free. Pro adds the forecast with a goal date, longer chart ranges, monthly reports, body measurements and the iCloud backup, among other things.

No, Happy Scale is only available for iPhone, iPad and Mac. Trendcurve shows your weight trend on iPhone and Android and imports the Happy Scale CSV file, so your history comes with you.

No. Trendcurve has no account and no server of its own. Your readings stay on your device; on iPhone, Pro lets you keep a backup in your own iCloud account.

On iPhone from Apple Health, on Android from Health Connect, so also from a connected scale. You can also enter values by hand or import a CSV file.

Medication tracking sets dose markers and reminds you of your weekly injection. With Pro, you see the weekly rate per dose step. Trendcurve gives no recommendations and is not a medical device; questions about your dose belong with your doctor.

In ten languages: German, English, French, Spanish, Italian, Portuguese, Dutch, Swedish, Norwegian and Danish.

See your trend, not the daily noise

Free for iPhone and Android, no account. Your readings stay on your device.

Free on the App Store Free on Google Play