# PWR518 App vs Redline

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.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

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.

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

## The numbers

| Metric | PWR518 App | Redline |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/pwr518-app/id1594919571/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/redline-sprint-timer/id6807452754/reviews) |
| Number of ratings | 1 | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | Free | Free |
| Size | 81 MB | 2 MB |
| Requires iOS | **11.0** | 16.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [HIIT IT WITH BRITT, LLC](https://appshunter.io/developer/1448927598) | [STEPHEN MARK SCHLESINGER](https://appshunter.io/developer/6791812406) |

## What reviewers say

### PWR518 App

[App page](https://appshunter.io/ios/app/pwr518-app/id1594919571)

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

**In-app purchases:** none


### Redline

[App page](https://appshunter.io/ios/app/redline-sprint-timer/id6807452754)

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:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*