Train with confidence
Every session is planned around your current training max.
Your next lift,
already calculated.
531 plans your 5/3/1 workouts, calculates every working weight, logs every set, and keeps your progress moving over the long haul.
- No account required
- Works offline
- Your data stays yours
No maths. Just lift.
Working weights and rep targets are calculated automatically.
Progress that lasts
Log every set and see strength build across blocks.
How it works
Three steps. Simple.
Set your training maxes
Enter your current maxes for squat, bench, deadlift, and overhead press.
Follow calculated sessions
Every percentage, working weight, and rep target is ready before you train.
Log and progress
Record your sets—including AMRAPs—and build momentum across training blocks.
Built for progress
Every detail.
Automated.
531 handles the calculations and remembers the details, so your attention stays on the bar.
Automatic weights
Percentages and working weights calculated for every session.
5/3/1 and BBB
Run a classic 5/3/1 cycle or add Boring But Big volume.
AMRAP logging
Capture completed reps and weights on the sets that matter.
Local-first data
Your workout history lives on your device and works offline.
Progress charts
See estimated strength trends for each of the big four lifts.
Backup and restore
Export a portable backup whenever you want one.
The big four
Built around the lifts
that matter.
Squat
Build lower-body strength and total-body power.
Bench press
Press with structure while your training max moves up.
Deadlift
Pull heavy with every percentage ready before the set.
Overhead press
Build strong shoulders with patient progression.
From the gym floor
Made for lifters
who keep showing up.
The numbers are ready when I walk into the gym. I spend less time checking notes and more time training.
It feels focused. No social feed, no clutter—just the session, the sets, and the next block.
Being able to export my own data matters. The app stays useful without forcing me into an account.
Start strong
Start free.
Plan and log your core 5/3/1 training without a subscription. No account is required.
Open the web appEarly supporter offer
Founder lifetime
£12.99- One-time purchase
- Founder status tied to your account
- Access to future Premium features
- Support independent development
Questions, answered
FAQ
Everything you need before your first training block.
What is 5/3/1?
5/3/1 is a long-term strength training method built around squat, bench press, deadlift, and overhead press. Training uses percentages of a conservative training max and progresses gradually.
Do I need an account?
No. You can set up a programme and log workouts locally without creating an account. An account is only needed for purchases and future account-linked features.
Does 531 work offline?
Yes. Your training plan and workout log are stored locally on your device, so the core app continues to work without an internet connection.
Which programmes are included?
The app currently supports Classic 5/3/1 and Boring But Big, including the main four lifts, percentage-based working sets, and accessory work.
Can I use pounds or kilograms?
Yes. Choose lb or kg during setup, and change units or training maxes later from Settings.
Can I back up my workouts?
Yes. Export a JSON backup from Settings and restore it later on the same or another device.