Comparison

PWR518 App vs Redline

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

Head to head
About

PWR518 App

Manage your fitness journey with this app. Sign up for classes, buy memberships, and get the latest news from the fitness studio. Everything you need is now accessible on your mobile device.

Highlights
  • Class sign-ups
  • Membership purchases
  • Latest updates
  • Mobile convenience
Read full description

Convenience is at your fingertips with our app, bring PWR with you everywhere! Download the PWR App to sign up for classes, purchase memberships, and stay in the know regarding the latest updates at PWR!

About

Redline

This app simplifies sprint interval training for runners. It provides customizable countdowns, voice cues, and haptic feedback for each sprint and rest period. Sessions sync with Apple Health and can be controlled via Apple Watch and the Lock Screen.

Highlights
  • Customizable sprint and rest intervals
  • Voice cues for transitions
  • Apple Watch workout integration
  • Lock Screen Live Activity
  • Apple Health syncing
  • No account or subscription required
Features
Read full description

The sprint workout, made simple. Free, for iPhone and Apple Watch. Redline is a free sprint interval timer with nothing in the way. No account, no login, no feed, no subscription, no ads. Pick how many sprints you want, press start, and go run. The countdown, the voice in your ear, the tap on your wrist, the workout in Apple Health: all of it just happens. WHY SPRINT INTERVALS Thirty seconds flat out, a real rest, and again. It builds speed, top end fitness and power faster than anything else you can do in running shoes. The hard part was never the sprinting. It was keeping track of it while you are bent over gasping. That is the one job Redline does, and it does it well. SET IT IN THREE TAPS One to ten sprints. Fifteen to sixty seconds each. One to ten minutes of rest. Six sprints of thirty seconds with three minutes between them is the classic session and it is the default, so most days you just hit start. IT TALKS, SO YOU NEVER LOOK DOWN A ten second lead-in gets you to the line. Then a voice calls every moment that matters. Go. Halfway. Stop. Recover, three minutes. Ten seconds. The cues play right over Spotify, Apple Music or your podcast, with nothing to connect and nothing to set up. Lock the phone, put it in your pocket, and it keeps talking. MADE FOR APPLE WATCH Redline runs on Apple Watch as a full workout on its own. Leave the phone in the car, hit start on your wrist, and every transition arrives as a tap, plus the voice cues if you have AirPods in. Your settings stay in sync between the two, and a session finished on either one shows up in the same history. ON YOUR LOCK SCREEN A Live Activity keeps the current sprint and the time remaining on your Lock Screen and in the Dynamic Island, so a glance in the middle of a rest tells you exactly what is next. SAVES TO APPLE HEALTH Every finished session is saved to Apple Health as a high intensity interval workout, with a segment for every sprint. Run it from the Watch and it records heart rate and energy too. Redline also keeps a simple history and a day streak, stored on your phone and nowhere else. WHY THERE IS NO SKIP BUTTON The rest is the training. Thirty seconds is about as long as anyone can hold a true all-out effort, and the last sprint only counts if you are actually recovered when you start it. So Redline makes you wait. You will thank it on sprint six. ONE HONEST NOTE Redline is a timer, not medical advice. All-out sprinting is hard on the body. Warm up properly, and check with a doctor first if you have any reason to. Free. No ads. No subscription. No tracking. Just sprints.

Screenshots

PWR518 App3 screens
Redline4 screens

Verdict

The call

The clearest difference is update cadence: Redline at weekly against PWR518 App's every 3 months. PWR518 App's advantage is iOS requirement (11.0 vs 16.2). 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for PWR518 App against 5.0 for Redline. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

UpkeepUpdate frequency

PWR518 App ships an update every 3 months, Redline weekly. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 7 level
PWR518 App versus Redline: the parameters behind the verdict, then further details
ParameterPWR518 AppRedline
PriceFreeFree
Rating5.0 (1 ratings)5.0 (2 ratings)
Number of ratings12 — better
Update frequencyEvery 3 monthsWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS11.0 — better16.2
Further details — not scored
Size81 MB2 MB
Age rating4+4+
DeveloperHIIT IT WITH BRITT, LLCSTEPHEN MARK SCHLESINGER

Customer experience

PWR518 App

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Redline

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

PWR518 App

No in-app purchases

None

Redline

No in-app purchases

Questions

Is PWR518 App free?
PWR518 App is free to download, with no in-app purchases.
Is Redline free?
Redline is free to download, with no in-app purchases.
Which has better reviews, PWR518 App or Redline?
PWR518 App and Redline are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.
Do PWR518 App or Redline have ads?
Neither PWR518 App nor Redline shows ads.
Which is updated more often, PWR518 App or Redline?
PWR518 App ships an update every 3 months, and Redline weekly. Most recently, PWR518 App was updated on November 3, 2026 and Redline on October 31, 2026.

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