Weekly
$1.99/week
For a short, focused push — a cut, a bulk, a deadline. About $103 a year if you stay, and we'd rather show you that math than hide it.
BUILD LEAN
Grow deliberately. Interpret estimates carefully.
See whether body weight is rising gradually while keeping noisy smart-scale composition estimates in their proper place.
Direction and pace belong together
A useful gaining phase is not just “up.” Trendline helps make the sustained movement legible over the time window you choose.
Composition readings are estimates
Consumer bioimpedance devices can be sensitive to hydration and measurement conditions. Consistent collection can still reveal a useful personal pattern, but it does not make the number objectively exact.
No invented physiology
Trendline does not label every pound as muscle or fat. It presents source-aware measurement context and states uncertainty directly.
Planning a surplus? The free TDEE Calculator gives you a maintenance-calorie range to build from.
How to use body-fat scale estimates without overtrusting them
THE APP UP CLOSE
What a good bulk looks like.
The real dashboard during a deliberate gaining phase, running the app's sample readings. Gaining weight is the goal here — so the interesting question is what kind.
The headline
“Gaining with some fat along for the ride: normal bulk economics.” The app treats gain as the goal while keeping the ratio between weight and body-fat change visible.
The two tiles, read together
Weight is +4.6 lb while body fat is −0.6%. Neither number tells the story alone. Side by side they show why a paired weigh-in matters.
The goal
The target is 210 lb, with 15 lb to go. The goal stays visible beneath the trend without turning a planning estimate into a promised arrival date.
A real screen from the app, running fictional sample readings. No person’s health record is shown.
PRICING WITHOUT SURPRISES
Choose your plan. Eligible subscriptions start with seven days free.
Weekly, monthly, and annual subscriptions include a seven-day introductory trial when Apple confirms eligibility. Lifetime is a one-time purchase with no trial or renewal. The full app is available during a subscription trial, and every price below shows the math apps usually make you do yourself.
Monthly
$5.99/month
About $72 a year. Month to month, cancel any time.
Annual
$39.99/year
About $3.33 a month — 44% less than paying monthly. The plan that assumes Trendline earns its place.
Lifetime
$99.99 once
Hate subscriptions? Own it forever. No renewals, ever.
Get launch details
Prices in USD; App Store pricing may vary by region. Apple confirms trial eligibility before purchase. Full details in the Terms.
KEEP THE SIGNAL
Keep the long arc visible while you build.
Trendline helps you see the sustained direction without overreacting to a single reading.
Get launch details