RepSpeed vs RPE 8 (slowdown tracker)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Automatic barbell detection
- Barbell path visualization
- Velocity and power metrics
- Video recording and upload
- Repetition tracking
- Workout notes
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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.
RPE 8 (slowdown tracker)
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Slowdowns in free tier. Works best in 4-20 repetition range and under a minute of time under tension. Limitations: Does not track well true grinder reps. Slower than 20 mm/s. Reps with a pause mid rep are not tracked. Free tier displays slowdowns. The number turns red when the slowdown is likely above RPE 8 for that repetition range. Paid tier displays average repetition velocity. Does not collect or send any of your data, all local processing.
Screenshots
Verdict
The clearest difference is in-app purchases: RPE 8 (slowdown tracker) at none against RepSpeed's 1. On price, update cadence, 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
Both are free to download. RepSpeed sells 1 in-app purchase, starting at $0.99 per month. RPE 8 (slowdown tracker) asks for nothing beyond the download.
RepSpeed ships an update every 2 weeks, RPE 8 (slowdown tracker) fortnightly. The most recent releases landed on September 6, 2026 and September 13, 2026 respectively.
| Parameter | RepSpeed | RPE 8 (slowdown tracker) |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (17 ratings) — better | — |
| Positive reviews | 83.3% of reviews | — |
| Number of ratings | 17 — better | — |
| Update frequency | Every 2 weeks — better | Fortnightly |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Requires iOS | 14.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 56 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Sreyas Rangaraju | 德凯 郝 |
In-app purchases
RepSpeed
- RepSpeed Premium14 Days trial$0.991 Month
RPE 8 (slowdown tracker)
No in-app purchases
Questions
Is RepSpeed free?
Is RPE 8 (slowdown tracker) free?
Do RepSpeed or RPE 8 (slowdown tracker) have ads?
Which is updated more often, RepSpeed or RPE 8 (slowdown tracker)?
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