Comparison

FLEX Stronger vs Metric Lift Strength Training

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

FLEX Stronger

This app revolutionizes weight training by syncing with a sensor to provide real-time performance feedback. Track, manage, and review your training like elite athletes, with automated workouts and group training options. It offers detailed metrics, video recording with data overlay, and a community feature for sharing and downloading workouts.

Highlights
  • Real-time performance feedback
  • Velocity-based training (VBT)
  • Automated workouts
  • Group training for up to three people
  • Video recording with synced data
  • 1RM prediction
  • Workout creation and sharing
Features
Read full description

Revolutionise the way you train and prepare in the weights room! The FLEX Stronger app syncs to a FLEX barbell sensor to deliver real-time feedback straight to your device. Track, manage and review training performance just like elite and professional athletes right across the globe, through the Major Leagues, UFC, Premier League and Olympic institutes. Developed by the team at GymAware, FLEX packages everything we learned from delivering gold standard products to the pro ranks into the only VBT system developed specifically for individual use. The smartest system on the market, FLEX automates your entire training experience. Select an exercise. Load some weight. Lift. Completely wireless. No calibration, adjustments or exercise creation required. Perfect for individual athletes, remote coaches and personal trainers. *Performance Metrics & Targets* Precise and immediate feedback on Mean and Peak Velocity, Mean and Peak Power, Distance, Height, Eccentrics, Position and live bar path tracing. Set targets on key performance metrics to benchmark effort across your session. *Group Training* Add other lifters into your session for group training with up to three people. Complete regular training, pre-programmed workouts or even the 1RM prediction with your group. Training partners who complete sessions with you can collect and store their data in their own profiles once the session is done. Training partners can be added or removed from sessions at any time. *Video Mode* Switch to video mode and record your set with synced data overlaid on the saved file. Send to friends, coaches or share online. Handsfree start and stop. Set your device up and lift. Your video will start, stop and crop to capture the set you just completed. *Automated Workouts* Complete workouts that step you through the entire program, from exercise and weight changes to targets and rest times. *Create, Share and Download Workouts* Create custom workouts directly in the app. Let FLEX run you through your new program, or share them via our Community feature with training partners or clients using FLEX. Looking for inspiration, download sessions from any of your connections in Community and complete them yourself. Set targets based on their results and compete and compare over the same workout. *1RM Predictions* Use the automated 1RM prediction protocol to gauge current strength and readiness levels without an actual 1RM attempt. *Multitasking* There are no limits in the FLEX app. Start regular sessions and add in training partners, or start a pre-programmed workout. Background the app and switch on your favourite tunes. Browse your historical results in the middle of your training sessions. Whatever you need is accessible any time. *Community* Create connections in the FLEX community so you can browse their training history, download sessions (complete with their results), send workouts, train in groups. View session data live as it is uploaded set by set, and interact with fist bumps and comments directly on the platform. *Store and Review* All your data is stored and reviewable in History right in your app. Data is securely backed upon our servers and retrieved on your device at any time.

About

Metric Lift Strength Training

This app uses your phone's camera to track barbell velocity and analyze lifting technique, offering insights previously only available with expensive hardware. It logs workouts comprehensively, monitors fatigue, and helps maximize strength gains while preventing injuries.

Highlights
  • Smart velocity tracking using phone camera
  • Advanced video analysis with bar path traces
  • Comprehensive workout logging
  • Performance insights and progression monitoring
  • Automated rest timer
  • No additional hardware required
Features
Read full description

Level up your training with Metric, the most advanced workout tracking app that combines traditional logging with revolutionary velocity-based training - no expensive hardware required. TRUSTED BY LIFTERS WORLDWIDE 1.5 million sets tracked | 100,000 downloads | Lifters and coaches in over 140 countries WHAT USERS ARE SAYING "Super simple to download and just start using. Great for getting clients and athletes to engage with their training in new ways. Can't believe this hasn't been done sooner!" - rugoody "Amazing to not have to pay thousands for a unit or even attach anything to a bar. Just click record on your camera and I can track my athletes Bar Velocity so easily." - Giannire "For not needing to buy any equipment this is a great tool. The vbt trackers go from 400 and up so for this to do what it does with nothing is amazing." - NoelpereziPhone6P "The app is brilliant. Superb for checking/tracking form and progression at the same time. I took an annual sub out after 5 days" - far.landscape Whether you're a powerlifter preparing for a meet, training to improve your athleticism on the field, or simply looking to get stronger and build muscle in the gym, Metric transforms how you train and coach. Gain insights that were previously only available to professional athletes, maximize your strength gains, and prevent injuries through proper technique and load management. Train with complete confidence as Metric's data shows your fatigue levels, recovery rates, and progression trends in real-time- helping you make smarter decisions about when to push harder and when tor regulate and recover. While traditional velocity tracking requires expensive and cumbersome external devices, strings or wearables, Metric delivers the same precise, validated measurements using just the camera on your iPhone or iPad, making actionable lifting insights accessible to everyone. CORE FEATURES SMART VELOCITY TRACKING - Track bar speed on 60+ exercises with validated accuracy - Receive audio cues when you hit specific velocity targets - Monitor fatigue through velocity loss during sets - Calculate estimated 1RM based on scientific velocity profiles - No additional hardware needed - just your phone - Record a quick set or incorporate velocity tracking into your workout flow ADVANCED VIDEO ANALYSIS - Record or import HD lifting videos - Generate detailed bar path traces for every rep - Review technique frame-by-frame - Share videos and analysis with coaches - Export videos to your camera roll COMPREHENSIVE WORKOUT LOGGING - Build, save and log your entire workout - Build and share templates to plan in advance - Access 150+ pre-loaded exercises - Create custom exercises - Track sets, reps, weight, and RPE - Automated rest timer PERFORMANCE INSIGHTS - Monitor strength progression - Track power output trends - Analyze ROM consistency - View velocity trends over time - Track estimated 1RM - load-velocity and load-power profiling - Real-time RPE charts and RPE-1RM estimations PERFECT FOR - Powerlifters, Strongman, and Olympic lifters - CrossFit and functional training - Bodybuilders and hypertrophy training - Strength and conditioning coaches - Performance-focused athletes - Personal trainers and online coaches - Any lifter wanting data-driven results GETTING STARTED IS SIMPLE & FREE 1. Select your exercise 2. Position your phone to capture your lift from the side 3. Record your set 4. Get instant velocity and technique analysis 5. Track single sets or complete entire workouts FREE, PRO, & COACH OPTIONS Record sets and workouts for free. Upgrade to Pro for advanced analytics, template builder, real-time feedback, and in-app video storage. Pro Coach plans also available for logging athlete workouts Join thousands of lifters using Metric to train smarter and maximize their gains. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

FLEX Stronger4 screens
Metric Lift Strength Training4 screens

Verdict

The call

The clearest difference is in-app purchases: FLEX Stronger at none against Metric Lift Strength Training's 16. FLEX Stronger also leads on rating (4.4 vs 4.0) and review sentiment (71% vs 53%). Metric Lift Strength Training's advantage is update cadence (every 9 days vs monthly) and ratings volume (45 vs 8). On price, ads and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Metric Lift Strength Training sells 14 in-app purchases, starting at $10.99 per month. FLEX Stronger asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

FLEX Stronger holds the better App Store score, 4.4 against 4.0. That said, the two scores are not equally well evidenced: Metric Lift Strength Training has 45 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 71% of FLEX Stronger's written reviews are positive against 53% of Metric Lift Strength Training's.

UpkeepUpdate frequency

FLEX Stronger ships an update monthly, Metric Lift Strength Training every 9 days. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

Scorecard7 real differences · 3 level
FLEX Stronger versus Metric Lift Strength Training: the parameters behind the verdict, then further details
ParameterFLEX StrongerMetric Lift Strength Training
PriceFreeFree
Rating4.4 (8 ratings) — better4.0 (45 ratings)
Positive reviews71.4% of reviews — better53.1% of reviews
Number of ratings845 — better
Update frequencyMonthlyEvery 9 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS15.0 — better18.1
Further details — not scored
Size56 MB181 MB
Age rating17+4+
DeveloperKinetic Performance Technology Pty LtdCore Advantage Pty Ltd

Customer experience

FLEX Stronger

All ratings8 ratings
Positive87.5%
Neutral0.0%
Negative12.5%
Written reviews7 reviews
Positive71.4%
Neutral14.3%
Negative14.3%

Metric Lift Strength Training

All ratings45 ratings
Positive68.9%
Neutral11.1%
Negative20.0%
Written reviews98 reviews
Positive53.1%
Neutral11.2%
Negative35.7%

In-app purchases

None

FLEX Stronger

No in-app purchases

14 purchases

Metric Lift Strength Training

Subscriptions14
  • Pro - Monthly$10.991 Month
  • Pro - Monthly (Legacy)$12.991 Month
  • Metric Pro - Monthly (Legacy)$12.991 Month
Show 11 more
  • Pro Family - Monthly$18.991 Month
  • Pro Coach +5 - Monthly$19.991 Month
  • Pro Coach +20 - Monthly$34.991 Month
  • Pro Coach +10$37.991 Month
  • Pro Coach +15$47.991 Month
  • Pro - Annual7 Days trial$79.991 Year
  • Metric Pro (Legacy)14 Days trial$79.991 Year
  • Metric Pro - Annual (Legacy)$94.991 Year
  • Pro Family - Annual$114.991 Year
  • Pro Coach +5 - Annual$119.991 Year
  • Pro Coach +10$339.991 Year

Questions

Is FLEX Stronger free?
FLEX Stronger is free to download, with no in-app purchases.
Is Metric Lift Strength Training free?
Metric Lift Strength Training is free to download, with in-app purchases available.
Which has better reviews, FLEX Stronger or Metric Lift Strength Training?
FLEX Stronger is rated higher. FLEX Stronger averages 4.4 out of 5 from 8 ratings, while Metric Lift Strength Training averages 4.0 from 45 ratings.
Do FLEX Stronger or Metric Lift Strength Training have ads?
Neither FLEX Stronger nor Metric Lift Strength Training shows ads.
Which is updated more often, FLEX Stronger or Metric Lift Strength Training?
FLEX Stronger ships an update monthly, and Metric Lift Strength Training every 9 days. Most recently, FLEX Stronger was updated on October 24, 2026 and Metric Lift Strength Training on October 30, 2026.

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