# iSmoothRun vs Race Time Calculator

The clearest difference is price: Race Time Calculator at Free against iSmoothRun's $4.99. Race Time Calculator also leads on rating (5.0 vs 4.4) and in-app purchases (none vs 2). iSmoothRun's advantage is ratings volume (943 vs 9) and chart position (#51 vs unranked). On update cadence, ads and device support there is nothing between them.

Race Time Calculator is free to download; iSmoothRun costs $4.99 up front. iSmoothRun sells 2 in-app purchases, starting at $4.99 per month. Race Time Calculator asks for nothing beyond the download.

Race Time Calculator holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: iSmoothRun has 943 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 70% of iSmoothRun's written reviews are positive against 100% of Race Time Calculator's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 24, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | iSmoothRun | Race Time Calculator |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [4.4 (943 ratings)](https://appshunter.io/ios/app/ismoothrun/id410965399/reviews) | **[5.0 (9 ratings)](https://appshunter.io/ios/app/race-time-calculator/id6478423515/reviews)** |
| Number of ratings | **943** | 9 |
| Positive reviews | 70.1% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Freemium | **Free** |
| Best chart rank | **#51** | — |
| Size | 31 MB | 13 MB |
| Requires iOS | **15.0** | 17.2 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lake Horizon Ltd](https://appshunter.io/developer/410965402) | [Declan Kramper](https://appshunter.io/developer/1732773264) |

## What reviewers say

### iSmoothRun

[App page](https://appshunter.io/ios/app/ismoothrun/id410965399)

**Currently charting:** #51 Top Paid · Health & Fitness (US App Store)

This app tracks and logs various fitness activities like running, walking, and cycling with extensive sensor support. It offers advanced training features, workout planning, and seamless integration with popular fitness platforms and HealthKit.

**Highlights:** Activity tracking (running, walking, cycling), Advanced sensor support (HRM, stride, power), Running Power training, Workout editor and planner, TrainingPeaks/Final Surge sync, HealthKit integration, Data export (GPX, TCX, KML, PWX, CSV)

**Features:** Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly Subscription | $4.99 | per month |
| Annual Pro Subscription | $24.99 | per year |

**What reviewers like**

- 💻 Excellent app for running, biking, and other activities
- 🎨 Highly customizable with great features
- 🔗 Seamless integration with various platforms and devices
- 🕰️ Reliable and accurate tracking
- 🏃‍♀️ Fantastic for interval training and coaching

**What reviewers complain about**

- 🐛 Frequent crashes and bugs, especially with recent updates
- 🔋 High battery drain, especially on Apple Watch
- 🔍 Inconsistent distance and pace tracking
- 🤖 Poor integration with some platforms like Garmin and Strava
- 🤔 Confusing and outdated user interface

**Reported bugs**

- Frequent app crashes, especially when starting a workout
- Inconsistent distance and pace tracking, especially on treadmill
- Issues with syncing data between iPhone and Apple Watch
- Problems with audio cues and notifications not working as expected

**Requested features**

- Improved Apple Watch app with standalone functionality
- Better integration with popular fitness platforms
- More customization options for data fields and audio cues
- Ability to import and sync workouts from other sources
- Improved battery life optimization


### Race Time Calculator

[App page](https://appshunter.io/ios/app/race-time-calculator/id6478423515)

This app analyzes your running data from Apple Health to predict accurate race times. Set personalized goals based on your training to improve performance and achieve personal bests. Share results with others for motivation.

**Highlights:** Analyzes running data from Apple Health, Predicts accurate race times, Provides personalized goal times, Offers insights in under a minute, Share results with friends

**In-app purchases:** none


## Frequently asked questions

### Is iSmoothRun free?

iSmoothRun costs $4.99, and also offers in-app purchases.

### Is Race Time Calculator free?

Race Time Calculator is free to download, with no in-app purchases.

### Which has better reviews, iSmoothRun or Race Time Calculator?

Race Time Calculator is rated higher. iSmoothRun averages 4.4 out of 5 from 943 ratings, while Race Time Calculator averages 5.0 from 9 ratings.

### Do iSmoothRun or Race Time Calculator have ads?

Neither iSmoothRun nor Race Time Calculator shows ads.

### Which is updated more often, iSmoothRun or Race Time Calculator?

iSmoothRun ships an update every 2 months, and Race Time Calculator every 2 months. Most recently, iSmoothRun was updated on October 24, 2026 and Race Time Calculator on October 12, 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.*