Train531
Open Web App
New Train531 is now on the web

The Only 5/3/1 App That Actually Coaches You

AI prescribes your accessories, analyzes your progress, and tells you what to do next — not just calculate percentages.

Start training free Download for iPhone

30-day free trial · In your browser or on iPhone · Always in sync

Stop Using a Calculator Disguised as an App

Every other 5/3/1 app does the same thing: you enter your maxes, it spits out percentages. When it comes to accessories, supplemental work, and what to actually do when you stall — you're on your own.

Features

Intelligence Behind Every Set

Smart Workout Generation

Your warmup, working sets, and AMRAP follow Wendler's proven percentages. Your supplemental and accessory work is prescribed by AI based on your training history, equipment, and goals.

Progress Analysis

Track estimated 1RM trends and weekly volume with clear charts. The AI coach analyzes your data and gives actionable feedback — not just graphs you interpret yourself.

Personal Records

Automatic PR detection using the Epley formula. Hit a new estimated one-rep max? You'll know immediately — no manual tracking required.

New — Train531 on the Web

Your Whole Program, in the Browser

Log sets, run rest timers, and review progress from any computer — synced with your phone. No download, nothing to install.

app.train531.com
Train531 web app — live workout with rest timer and set logging
Open the web app

Free to start — sign in with Google, Apple, or email.

And on iPhone

Built for Lifters, Not Beginners

Train531 01-Today screen
Train531 02-Workout screen
Train531 03-History screen
Train531 04-Progress screen
Train531 05-Exercises screen
Train531 06-Settings screen

Not Just Another Calculator

Other 5/3/1 Apps

  • Calculate percentages from your training max
  • You pick your own accessories (or skip them)
  • Show you graphs with no interpretation
  • Rigid set order — can't adapt mid-workout
  • No awareness of your training history

Train531

  • Calculate percentages AND prescribe supplemental templates
  • AI picks accessories based on your weak points and equipment
  • AI analyzes your trends and tells you what to change
  • Swap any exercise mid-workout with an intelligent replacement
  • Every prescription informed by your full training history

Ready to run real 5/3/1?

Start your 30-day free trial — takes about a minute.

Start in your browser Get the iPhone app

Smart Rest Timers

Automatically tuned by set type. 60s for warmups, 120s for working sets, 180s for AMRAP.

50+ Exercises

Pre-loaded library with muscle group tagging, favorites, and search. Find what you need instantly.

Clean & Focused

No social feeds. No transformation photos. No bloat. Just 5/3/1, done right, with intelligence behind it.

Syncs Everywhere

iPhone, iPad, and the web app at app.train531.com. Log a set on your phone, review your progress in the browser — always in sync.

Pricing

Try Before You Buy

Every plan starts with a 30-day free trial — a full month of real training with the AI coach. Cancel anytime.

Monthly

$4.99 /mo
  • AI workout prescriptions
  • Progress analysis
  • Unlimited workouts
  • iPhone, iPad & web sync
Start Free Trial
Save 42%

Yearly

$34.99 /yr

That's $2.92/month

  • Everything in Monthly
  • Best value for serious lifters
  • Lock in your price
Start Free Trial

Not on iPhone? Train in your browser — no download needed: app.train531.com

Frequently Asked Questions

What is 5/3/1?
5/3/1 is a proven strength training program created by Jim Wendler. It's built around four main barbell lifts — squat, bench press, deadlift, and overhead press — using a structured progression of percentages across weekly cycles. It's one of the most popular and effective programs for building real-world strength.
How is Train531 different from other 5/3/1 apps?
Every other 5/3/1 app is a calculator — enter your maxes, get percentages. Train531 is the only one with an AI coach that prescribes your supplemental work and accessories based on your actual training history, available equipment, and goals. It also analyzes your progress and tells you what to change.
How does the free trial work?
Every plan starts with a 30-day free trial — a full month of AI-powered training on your real program. Start it on your iPhone or in the browser at app.train531.com. Cancel anytime during the trial and you won't be charged.
Does the AI replace Wendler's programming?
No. The core 5/3/1 structure — warmup sets, working sets, and AMRAP — is calculated deterministically from Wendler's proven percentages. The AI only handles supplemental template selection (BBB, FSL, SSL) and accessory prescriptions, adapting those to your training history and weak points.
What data does Train531 collect?
Your training data (sets, reps, weights) is stored on your device and synced securely to your account, so it's available on all your devices. When the AI coach generates workouts or analyzes progress, a summary of your training history is sent to our API. We never sell your data. See our privacy policy for details.
What devices are supported?
iPhone and iPad with iOS 26 or later — plus a full web app at app.train531.com that runs in any modern browser and stays in sync with your phone.

Ready to Train Smarter?

30 days free. Just you, the barbell, and an AI coach that knows what you need — on your phone or in your browser.

Start training free Download for iPhone