SET THE CONTEXT
Goals, time and equipment
Choose strength, hypertrophy or powerbuilding. Flux builds around the days, minutes and kit you actually have.
ADAPTIVE WORKOUT PLANNER FOR IPHONE & IPAD
The adaptive workout planner that reacts before you have to.
Flux Workouts is a smart gym tracker and personalised lifting programme for iPhone and iPad. It uses on-device machine learning—not chatbots—to build strength, hypertrophy, and powerbuilding sessions around your goals, equipment, and recovery, then adjusts weights, reps, and exercises session to session.
Download free. Try every feature for 14 days with no payment, subscription or automatic charge. After the trial, keep training with one Lifetime Unlock. Eligible existing paid owners keep Full Access.
- Programming
- 5 strength models
- Progression
- Adapts session to session
- Privacy
- On-device ML
HOW FLUX WORKS
One continuous training loop.
Not another plan to manage.
You bring the intent and effort. Flux handles the repetitive programming decisions that normally live in notes, spreadsheets and guesswork.
TRAIN & RECORD
Every useful signal captured
Log load, reps and effort. Finish offline: completion confirms once your workout and final feedback save on your device.
ADAPT THE PLAN
The next session gets smarter
Performance, feedback and recovery context shape what changes next—without taking control away from you.
THE BENEFIT
Open the app and know what to do, why it fits today and what progress looks like next.
BUILT BEYOND THE LOGBOOK
Everything your current tracker records.
Plus the decisions it cannot make.
Five strength periodisation models. Offline workout saving. Clearer Routine Details. Explore what’s new in Flux 8.5.1 →
01 · PERSONALIZED
Workouts that fit real life
Generate around your goal, available equipment and session length instead of reshaping your day around a template.
02 · ACTIONABLE
Every target ready before you train
Your strength model shapes sets, reps, load, rest and effort targets. See the prescription before the first set.
03 · EXPLAINABLE
Progress you can understand
See consistency, performance and training status as useful signals—not a wall of disconnected gym statistics.
WHY FLUX
More adaptive than a plan.
More useful than a tracker.
A practical comparison of common training tools. Individual products vary; the difference is whether planning, performance and recovery work together.
| What you need | Static plan | Basic tracker | Chat-based apps | Flux |
|---|---|---|---|---|
| A complete workout in seconds | Pre-written | — | Yes | Yes |
| Uses your training history | — | Stores it | If re-entered | Continuously |
| Progresses load and reps | Fixed rules | You decide | One-off advice | Session to session |
| Accounts for recovery | — | — | If prompted | In the plan |
| Fits your equipment and time | Sometimes | Manual edits | Yes | Every session |
| Keeps you in control | Follow or abandon | Yes | Regenerate | Edit, swap, override |
“Chat-based apps” means a general fitness chatbot or one-off generated workout—not an integrated training log with on-device machine learning built from your history.
PRIVATE BY DESIGN
Smart training.
Not a chatbot.
Flux is not ChatGPT for the gym. Personalisation runs through on-device machine learning trained on your workouts—not cloud AI agents or open-ended chat prompts.
ON-DEVICE ML
Personalisation stays on your iPhone or iPad
Exercise selection, progression, and readiness use machine learning models that run locally. No need to paste workouts into a chat window.
YOUR DATA
Optional sync. No selling health data.
Workout history can stay on-device. Cloud sync is optional for signed-in backup. Apple Health integration is user-controlled. See our privacy policy.
SECURITY
Built for training, not engagement loops
Flux adapts from logged performance and recovery signals you choose to share—not from open-ended AI conversations or third-party data brokers.
WHAT CHANGES FOR YOU
Fewer programming chores.
Better training decisions.
ARRIVE WITH A PLAN
Stop building every session from scratch
Your next workout is ready around your goal, schedule and gym—not copied from somebody else’s week.
PROGRESS WITH CONTEXT
Know when to add, hold or ease off
Flux connects performance and recovery so progressive overload becomes a decision, not a reflex.
KEEP THE FLEXIBILITY
Adapt without derailing the programme
Swap exercises, change equipment or run an ad-hoc session while your longer-term training stays coherent.
SEE THE PLAN
Your routine, easier to navigate
Overview brings workouts and progress together. Settings keeps controls close. Supported saved programmes also include a Guide.
FREE TO TRY. NO SUBSCRIPTIONS.
Try every feature.
Keep it with Lifetime.
Start with a 14-day Full Access trial managed by Flux. It requires no payment and never charges you automatically. After the trial, training requires a Lifetime Unlock or an eligible existing entitlement.
FULL ACCESS TRIAL14 DAYS
Get to know the complete app
- Free download for iPhone and iPad
- Every feature available during the trial
- No payment required to start
- No subscription or automatic charge
- Adaptive workouts, routines and insights
- Training access ends when the trial expires unless you have an unlock
LIFETIME UNLOCKPAY ONCE
Keep Full Access for life
- One non-consumable in-app purchase
- Permanent access to every training feature
- No monthly or yearly recurring fee
- Apple shows your local price before you confirm
- Eligible existing paid owners and recognised historical purchasers keep Full Access
- Lifetime and Founder Lifetime holders do not need to buy again
TRAINING, EXPLAINED
The Flux Workouts blog.
Keep the science useful.
Practical guides, product releases and the decisions behind better strength training.
Recovery · 30 Aug 2026
Had a Bad Night’s Sleep? Here’s How to Adjust Your Workout
Decide whether to train normally, reduce the session or rest after poor sleep using performance, symptoms and workout risk—not guilt.
Read article → Workout Plans · 28 Aug 2026
How to Build a Workout Around the Equipment You Actually Have
Build a balanced workout from the equipment you own or can access by matching movement roles instead of copying an exercise list.
Read article → Flux Updates · 28 Aug 2026
Flux 8.5.1: more choice, clearer routines, dependable completion
Five strength periodisation models, offline-first workout saving and redesigned Routine Details. Explore Flux 8.5.1, now free to try for 14 days.
Read article →YOUR NEXT SESSION IS THE START
Train with a plan that
keeps up with you.
Download free and try every feature for 14 days. No payment, subscription or automatic charge. After the trial, keep training with a one-time Lifetime Unlock—or your eligible existing access.
iPhone & iPad · 14-day trial · One-time Lifetime Unlock