StrengthLog vs Flux
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
StrengthLog
Track your workouts, analyze progress, and discover proven strength training programs. Log unlimited workouts, access a vast exercise library, and set goals. Upgrade for advanced statistics and premium programs.
- Unlimited workout logging
- Extensive exercise library with video instructions
- Proven strength training programs
- Progress analysis and statistics
- Goal setting and streak tracking
- Plate calculator and rest timer
- Apple Health integration
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THE WORLD’S MOST GENEROUS WORKOUT TRACKER StrengthLog is the workout tracker for people who take their training seriously, whether you’re just getting started or have been lifting for decades. Plan your training. Log every set. Track your progress. Follow proven training programs or build your own. Compare your strength with other lifters. Set goals, build streaks, and challenge your friends. And unlike many workout apps, StrengthLog gives you everything you need to train effectively for free. Unlimited workout logging. No ads. No trial that suddenly locks you out. 100% gains, 0% ads. BUILT FOR LIFTERS, BY LIFTERS StrengthLog has been developed together with hundreds of thousands of lifters, from beginners to competitive strength athletes. Our library contains 600+ strength, cardio, and mobility exercises with instructions and videos. You can also create your own exercises. Log as you train or plan ahead with our calendar. Follow a ready-made training program, build your own, or simply decide what to do when you get to the gym. Your training history, PRs, statistics, and Strength Levels make it easy to see where you’ve been and where you’re going. TRAIN TOGETHER Connect with friends and make your training a little more social. See when your friends train, celebrate their progress, compare PRs and Strength Levels, and create or join challenges together. Challenge each other to train more often, do more reps, or reach whatever ridiculous goal you can come up with. You choose who you connect with, and your full training log stays private. FREE FEATURES • Log unlimited workouts, forever. • Support for both kg and lbs. • 600+ exercises with instructions and videos. • Create unlimited custom exercises. • Follow popular workouts and training programs. • Build your own routines and programs with linear progression. • Plan workouts and programs in your training calendar. • Track PRs and exercise history. • Compare your strength with other lifters using Strength Levels. • Track training volume, workouts, and other statistics. • Create training goals and streaks. • Complete our monthly challenges. • Connect with friends and challenge each other. • Use our rest timer and plate calculator. • Estimate your 1RM and get suggested PR warm-ups. • Track body measurements and progress pictures. • Connect with Apple Health. GO PREMIUM StrengthLog Premium unlocks our most advanced tools while supporting the continued development of the app. Premium includes: • Build unlimited training routines and programs with double and triple progression. • Our complete library of training programs for strength, bodybuilding, powerlifting, powerbuilding, sports, and more. • Advanced statistics for your training, muscle groups, and exercises. • Muscle heat maps showing what you’ve trained over any period. • Customizable favorite graphs. • Advanced logging with RPE, Reps in Reserve, % of 1RM, and quick set stats. • More tools for analyzing and planning your training. • Unlimited goals and streaks. • Connect your account to ChatGPT or Claude using our MCP integration. Whether you want a simple workout log or enough training data to disappear down a statistical rabbit hole for an entire evening, StrengthLog has you covered. Have an idea, found a bug, or just want to tell us what you think? Contact us at app@strengthlog.com. SUBSCRIPTIONS StrengthLog Premium is an automatically renewing subscription. • Choose between 1, 3, and 12 months. • Your App Store account will be charged upon purchase and your subscription will renew automatically unless canceled at least 24 hours before the end of the current period. • You can manage or turn off auto-renewal in your App Store account settings. APPLE HEALTH With your permission, StrengthLog can read relevant data from Apple Health and share your completed workouts with it. You control what data StrengthLog can read or write through your Apple Health permissions.
Flux
This app helps you train smarter by generating personalized workouts based on your goals, available equipment, and time. It uniquely adapts to your progress over time, keeping all your data on your device for privacy. Track every set, rep, and weight with ease, and benefit from advanced features like progressive overload and fatigue-aware training.
- Personalized workout generation
- Customizable routines and exercises
- Real-time adaptive changes
- Progressive overload and periodisation
- Fatigue-aware training support
- Apple Health integration
- Data export
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Walk into the gym with a plan. Leave knowing what to aim for next. Flux creates personalized gym routines around your goals, experience, schedule, session length and available equipment. See your whole workout in one scrolling view, log sets with less screen switching and keep past performance close when choosing your next targets. TRY EVERY FEATURE FREE Download Flux free and use every feature for 14 days. No payment is required, the trial does not start a subscription and there is no automatic charge. UNLOCK FOREVER After the trial, training features require a one-time Lifetime Unlock. There is no free training tier after the trial and no recurring charge. Apple shows the price for your storefront before you confirm. Eligible existing paid owners keep permanent Full Access. PLAN AROUND YOUR LIFE - Generate Push/Pull/Legs, Upper/Lower, Full Body and other routines - Match training to your equipment, schedule and available weight increments - Choose a session length from 30 to 90 minutes when generating a routine - Build your own routines and custom exercises - Browse prebuilt programs with Overview, Guide and Settings before choosing - Follow Flux Hybrid for strength and timed cardio - Swap exercises for a workout or across the remaining program where supported CHOOSE YOUR STRENGTH PERIODIZATION - Adaptive Block: goal-appropriate phases with completion and recovery checks - Daily Undulating: different strength-day emphases across your routine - Linear: a six-week progression of training emphasis - Weekly Undulating: routine-wide emphasis that changes by model week - Manual: choose an eligible phase, with safety recovery when needed Choose a model when generating a strength routine. To change models, generate a new routine. Prebuilt programs keep their authored progression; HIIT keeps its timed prescription. Personalized features need calibration and sufficient training history. FOLLOW YOUR WORKOUT IN ONE PLACE - Log sets with less screen switching and see what is done and what comes next - Keep warm-ups and working sets together, with rest timers and set targets - Move on easily: the next unfinished exercise comes into view automatically - Use individual set targets, supersets, drop sets, myo-reps and giant sets - Add sets and notes, or open Edit, Swap and Remove from your workout - Review achieved sets, missed targets, next-session guidance and trained muscles in Workout Complete EDIT SETS AND CHECK PROGRESS IN ONE PLACE Choose your next targets with past performance close by. Edit sets in Settings, then switch to Stats in the same exercise details screen for performance charts, volume trends and previous workouts. Pick a date range to see recent sessions or the longer trend. Available from your workout, Next Up or saved routine, with history across routines. Future prebuilt target restrictions still apply. UNDERSTAND YOUR TRAINING - Review Strength, Health, Consistency and Targets hit in Insights - Follow your current routine from the day you started it - Revisit findings saved with your Check-in reports - See your training phase and position in Routine Overview - Use optional Apple Health sleep, HRV and heart-rate context - Export training data and use optional signed-in cloud backup MAKE FLUX YOURS Choose System, Light or Dark in Profile > Theme. Signed-in choices sync; System follows each device. Home widgets and Live Activities follow where iOS permits. Log offline with valid access. An already-open workout can be finished after trial expiry; returning after expiry shows the paywall. Restore Purchases and Account & Data remain available. Cloud backup syncs separately when online. Apple Health is optional. Learn more: https://fluxworkouts.com Support: https://fluxworkouts.com/support Terms: https://fluxworkouts.com/terms Privacy: https://fluxworkouts.com/privacy
Screenshots
Verdict
The clearest difference is ratings volume: StrengthLog at 3.7K against Flux's 1. StrengthLog also leads on device support (4 vs 1) and iOS requirement (15.0 vs 26.2). Flux's advantage is review sentiment (100% vs 88%). On price, rating, update cadence and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. StrengthLog sells 3 in-app purchases, starting at $16.90 per month and Flux sells 4 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 4.9 for StrengthLog against 5.0 for Flux. That said, the two scores are not equally well evidenced: StrengthLog has 3.7K ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 88% of StrengthLog's written reviews are positive against 100% of Flux's.
StrengthLog ships an update every 6 days, Flux weekly. The most recent releases landed on October 22, 2026 and October 21, 2026 respectively.
| Parameter | StrengthLog | Flux |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (3.7K ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 88.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 3.7K — better | 1 |
| Update frequency | Every 6 days — better | Weekly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Freemium |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone |
| Requires iOS | 15.0 — better | 26.2 |
| Further details — not scored | ||
| Size | 158 MB | 47 MB |
| Age rating | 12+ | 4+ |
| Developer | Styrkelabbet AB | Digital Flux Ltd |
Customer experience
StrengthLog
Flux
Bugs and requests
StrengthLog
Reported bugs
3 issues- Disappearing workout data
- Inability to clear/reset workout history
- Inconsistent behavior when planning workouts for the same day
Requested features
4 requests- Ability to save and edit custom workout plans
- Seamless integration with Apple Health
- Community features like challenges and leaderboards
- More personalized workout recommendations
Flux
Not enough reviews yet to summarise bugs or requests.
In-app purchases
StrengthLog
- StrengthLog Premium - 1 month14 Days trial$16.901 Month
- StrengthLog Premium - 3 months14 Days trial$37.903 Months
- StrengthLog Premium - 1 year14 Days trial$109.001 Year
Flux
- Flux Pro : 1 Month$2.991 Month
- Flux Pro : 12 Month$19.991 Year
- Flux Pro : Lifetime Pass - Founder$49.99
- Flux Pro : Lifetime Pass$59.99









