Comparison

iSmoothRun vs Race Time Calculator

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

Head to head
About

iSmoothRun

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
Read full description

iSmoothRun is the best App to effectively track and log all of your running, walking, hiking, cycling and any other fitness activity. Solid performance. Continuous development. Best sensor support (HRM, stride sensor, speed/cadence combo, cycling power, running power, treadmill) Now with support for Watch OS9 "Running Power". (for devices that support it), Always ON Display support and Apple Watch Ultra Action Button. Base your training on Running Power, create workouts with power intervals and take your training to the next level. The best stand alone Apple Watch app, with configurable pages and solid performance that puts to shame any sports watch. Connect your BT sensors to your watch and leave your phone home. Best Interval and workout editor to help you follow your training plan. Create any workout based on HR, HR Zone, Pace or Power and let the app pace you. Workouts are available on the Apple Watch too with full Audio support! Auto sync structured workout plans from Training Peaks, Final Surge and TrainAsOne (requires Pro subscription). Connect with these services and have your structured workouts directly on your Apple Watch or iPhone. Start your run and let the app coach you. Integration with HealthKit. iSmoothRun uses HealthKit to export your activities into the Health and Activity apps and to read heart rate and biometric data. Accurately tracks time, distance, location, pace, altitude, running cadence, heart rate, power and reports them with audio announcements at configurable time or distance intervals. - Improve you running Form iSmoothRun will consistently track your running cadence. Use the build in metronome (iPhone only) to easily raise it. - The most extended support for sensors All BT Smart sensors (HRMs, footpods, speed/cadence combo, cycling power, Stryd running power custom metrics like Contact Time, Form Power etc are supported too) All ANT+ (extra hardware needed: 4iiii Viiiiva ) - Your data are yours, Don't lock yourself in. We love being open. Export your training data in GPX,TCX,KML,PWX, or CSV format. Connect and share your workouts with the most active running communities, Strava, Runkeeper, sportTracks, Movescount, SmashRun, TrainingPeaks, FinalSurge, Runalyzer, TrainAsOne and MapMyRun .This is the most connected app, period. -Run/Walk Are you into Run/walk training? Great. Now it's easier than ever to set your timers and enjoy all the benefits of the best running app. - Track your Shoe mileage Every runner knows that tracking the mileage of his running shoes is essential. - Check your workout statistics Average pace/speed, cadence, total distance, time, average/maximum heart rate and climb. Splits and interval statistics. - Your iPhone is your training log All your data stored in the device. Amazing customizable graphs for each run and for weekly, monthly loads. Follow closely your training load, train smarter and avoid overtraining. - Ghost Run Race against a previous run of yours or a predefined pace. Get motivated, evaluate your training. ...and much more! ** You can subscribe and pay through your iTunes account. Payment will be charged to iTunes account at confirmation of purchase. Your subscription will automatically renew unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. Subscriptions may be managed by the user and auto-renew may be turned off after purchase by going to the 'Manage Subscription' page in settings. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. The subscription will renew at the same cost. ** Continued use of GPS running in the background can dramatically decrease battery life. **iPod touch users are advised to use an external sensor, GPS or footpod.

About

Race Time Calculator

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
Read full description

Training for an upcoming race? Want to know what time you should aim for based on your recent training? Race Time Calculator analyzes your running data (stored in your Apple Health app) to predict your expected race times with real accuracy. With personalized goal times based on your actual training, you’ll unleash your full potential, crush PRs, and even surprise yourself! Why Race Time Calculator? • The ONLY app that uses your real running data for predictions. • Provides accurate insights in under a minute to help you train smarter. • Share your in-app results with friends and training partners to stay motivated. Don’t leave your performance to chance. Use your data to run smarter and achieve your goals! Note: Race Time Calculator requires running workouts to be saved in your Apple Health app.

Screenshots

iSmoothRun4 screens
Race Time Calculator4 screens

Verdict

The call

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 (#40 vs unranked). On 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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard8 real differences · 3 level
iSmoothRun versus Race Time Calculator: the parameters behind the verdict, then further details
ParameteriSmoothRunRace Time Calculator
Price$4.99Free — better
Rating4.4 (943 ratings)5.0 (9 ratings) — better
Positive reviews70.1% of reviews100.0% of reviews — better
Number of ratings943 — better9
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
Best chart rank#40 — better—
DevicesiPhone, iPod, Apple Watch — betteriPhone, iPad
Requires iOS15.0 — better17.2
Further details — not scored
Size31 MB13 MB
Age rating4+4+
DeveloperLake Horizon LtdDeclan Kramper

Customer experience

iSmoothRun

All ratings942 ratings
Positive84.2%
Neutral3.5%
Negative12.3%
Written reviews752 reviews
Positive70.1%
Neutral7.8%
Negative22.1%

Race Time Calculator

All ratings8 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

iSmoothRun

Reported bugs

4 issues
  • 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

5 requests
  • 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

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

iSmoothRun

Subscriptions2
  • Pro Monthly Subscription7 Days trial$4.991 Month
  • Annual Pro Subscription7 Days trial$24.991 Year
None

Race Time Calculator

No in-app purchases

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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