Comparison

FLEX Stronger vs RepSpeed

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

RepSpeed

This app uses your phone's camera to analyze barbell lifts, providing detailed metrics like bar path, velocity, and power. Optimize your training, improve form, and get stronger faster with advanced analytics.

Highlights
  • Automatic barbell detection
  • Barbell path visualization
  • Velocity and power metrics
  • Video recording and upload
  • Repetition tracking
  • Workout notes
Features
Read full description

Best barbell tracking app! Simply record a video from the side of your barbell lift to get detailed analytics such as bar path, range of motion, velocity/speed, and power. Join the tens of thousands of people using analytics to optimize their training and get stronger faster with this app! https://www.repspeed.net/ Features: Automatic barbell detection Trim video to eliminate excess time Take video with camera or upload from video on device Easily visualize repetitions over time View barbell path throughout lift Frame by frame playback Add notes to every workout Unlimited videos for analysis (premium) View time, velocity, and power for every repetition and set average (premium) RPE and One-Rep max calculation coming soon (premium) Use cases: Velocity based training - Lift in the correct velocity range. Power based training - Train to maximize power to increase vertical jump and explosiveness. Olympic Lifting - Know if failed lift was technical (didn't get under the bar fast enough) or because of strength (bar did not reach adequate height to get under) Correct form - Ensure the bar path is completely vertical, squat depth is low enough, catch is not too low during power clean, etc. User's thoughts: "I like seeing how fast I’m performing each rep for things like pause squats and more explosive Olympic lifts" "Nice way to visualize how much time you have between reps" "Let's me measure power on my lifts without having to spend lots of money" "I've never been able to measure my workouts so easily before" Privacy Policy: https://repspeed.s3.us-west-1.amazonaws.com/Privacy%20Policy.htm Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Don't waste hundreds of dollars buying inaccurate accelerometers or other bulky hardware to track the barbell. With just your phone and an inexpensive $1/month subscription, you'll have everything you need to optimize your training.

Screenshots

FLEX Stronger4 screens
RepSpeed4 screens

Verdict

The call

The clearest difference is in-app purchases: FLEX Stronger at none against RepSpeed's 1. FLEX Stronger also leads on iOS requirement (12.0 vs 14.0). RepSpeed's advantage is update cadence (every 2 weeks vs monthly) and review sentiment (83% vs 71%). On price, rating, ratings volume 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. RepSpeed sells 1 in-app purchase, starting at $0.99 per month. FLEX Stronger asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.4 for FLEX Stronger against 4.5 for RepSpeed. Both are backed by a comparable volume of ratings — 8 and 17 respectively. Written reviews are what separate them: 71% of FLEX Stronger's written reviews are positive against 83% of RepSpeed's.

UpkeepUpdate frequency

FLEX Stronger ships an update monthly, RepSpeed every 2 weeks. The most recent releases landed on October 4, 2026 and October 7, 2026 respectively.

Scorecard5 real differences · 5 level
FLEX Stronger versus RepSpeed: the parameters behind the verdict, then further details
ParameterFLEX StrongerRepSpeed
PriceFreeFree
Rating4.4 (8 ratings)4.5 (17 ratings) — better
Positive reviews71.4% of reviews83.3% of reviews — better
Number of ratings817 — better
Update frequencyMonthlyEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better14.0
Further details — not scored
Size83 MB56 MB
Age rating17+4+
DeveloperKinetic PerformanceSreyas Rangaraju

Customer experience

FLEX Stronger

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

RepSpeed

All ratings17 ratings
Positive88.2%
Neutral0.0%
Negative11.8%
Written reviews6 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

In-app purchases

None

FLEX Stronger

No in-app purchases

1 purchases

RepSpeed

Subscriptions1
  • RepSpeed Premium14 Days trial$0.991 Month

Questions

Is FLEX Stronger free?
FLEX Stronger is free to download, with no in-app purchases.
Is RepSpeed free?
RepSpeed is free to download, with in-app purchases available.
Which has better reviews, FLEX Stronger or RepSpeed?
RepSpeed is rated higher. FLEX Stronger averages 4.4 out of 5 from 8 ratings, while RepSpeed averages 4.5 from 17 ratings.
Do FLEX Stronger or RepSpeed have ads?
Neither FLEX Stronger nor RepSpeed shows ads.
Which is updated more often, FLEX Stronger or RepSpeed?
FLEX Stronger ships an update monthly, and RepSpeed every 2 weeks. Most recently, FLEX Stronger was updated on October 4, 2026 and RepSpeed on October 7, 2026.

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