Built by a lifter who kept forgetting the weight

Remember the weight.
Forget the app.

I built Gainz after one too many workouts spent guessing what I lifted last time. It is the minimal logger I could not find: fast on iPhone, hands-free on Apple Watch when it can be, and intentionally quiet so you can get back to lifting.

Download on the App Store →
Built by a gym-goer, for gym-goers Free to start Apple Watch on Premium
Bench Press
Set 3 of 4
Last: 185 lbs x 8
185 lbs
8 reps
3s
AI training intelligence

Know what today’s training should be.

Turn five quick signals—goal, performance, soreness, sleep, and consistency—into one clear call for your next workout.

Check my training readiness

Everything you need.
Nothing you don't.

Built for lifters who want results, not features.

3-Second Logging

Tap weight. Tap reps. Done. No menus, no friction, no wasted time between sets.

Beat Your Last

See exactly what you lifted last time. No guessing, no scrolling. Progressive overload made obvious.

Your Data. Yours.

Offline-first with optional sync. We do not sell workout data. Data export is available on Pro and Premium plans.

Start free. Upgrade only if it earns it.

Log a real workout on iPhone before deciding whether the extra tools are worth paying for.

Gainz Free

$0 to start

Use the core iPhone workout logger and decide from a real session—not a sales page.

  • Fast set logging on iPhone
  • Previous results before the next set
  • Offline-first workout logging
Gainz Pro · Optional

$1.99 / week in the U.S.

Choose weekly, monthly, or annual billing only when you want Apple Watch support and advanced tools.

  • $4.99 monthly in the U.S.
  • $39.99 yearly in the U.S.
  • Apple Watch workout workflow

Prices verified on the U.S. App Store on July 28, 2026. Apple shows the exact local price before purchase. View Gainz on the App Store.

Start training today.

No invite. No waitlist. Download Gainz, open a workout, and make your next set count.

Download Gainz
01 / Download

Get Gainz from the App Store

Install the iPhone app, start free, and bring your workout history into a tracker that is built for lifting instead of admin work.

Available now for iPhone

02 / Log

Track the set you are doing now

Weight and reps stay front and center, so you can log quickly between sets without losing focus or digging through menus.

3-second set logging

03 / Progress

Beat yesterday's numbers

See the previous target before you lift, keep training offline when the gym signal drops, and sync when you are ready.

Offline-first with optional sync

The app is out. Your next workout can start in Gainz.

Download Gainz from the App Store today, open it on your iPhone, and start your first workout in seconds.

Download on the App Store

No invite | Free to start | Requires iOS 17 or later