Comparison

10K Trainer by C25K® vs Intervals Pro

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

Head to head
About

10K Trainer by C25K®

This app guides beginners from sedentary to running a 10K in 14 weeks with a structured walk/run program. It features an audio coach, progress tracking, and community support. Ideal for those new to running or graduating from a 5K program.

Highlights
  • 14-week walk/run training plan
  • Audio coach guidance
  • Progress tracking
  • Community forums
  • Integration with Health app
  • Music integration
Features
Read full description

■ The Official 10K Trainer app with millions of success stories! ■ Official partners and the ONLY C25K (Couch to 5K) app featured on FITBIT and SAMSUNG smart watches! ■ Featured on The New York Times, Los Angeles Times, The Washington Post, The Guardian, The Huffington Post, Men's Fitness, Forbes, Mashable, Glamour Magazine, Popsugar Fitness, CBS News, NBC News, Macworld, Cosmopolitan, Lifehacker, WebMD and many more! "Daily programs that alternate between short bursts of walking and running until you're ready to go the distance." - Forbes "One of the highest-rated health and fitness apps... A modest, realistic workout schedule." - Men's Fitness ≈ Real-Life Inspirational Transformations ≈ ◎ Over 175,000 Likes and 1500 Success Photos at facebook.com/c25kfree ◎ Our community inspires one another (and inspires us!) everyday. Hear some of their amazing stories. "In this last year I have lost 97 lbs, gotten off insulin and 9 other medications, completed the C25K running app and started the 10k app. Life is a blessing." - Diana “I went from a size 16 to a size 7. I tell anyone I can about the app. because it was nothing short of a life changer.” - Amber 10K Trainer is the easiest program to get beginners from couch potatoes to 10K distance runners in just 14 weeks. By the same experts who created the #1 C25K® (Couch to 5K) training app! Don’t worry, if you are already a 5K graduate, you can skip ahead and pick up where C25K® app leaves off! This proven 14 week plan will allow users to slowly build strength and stamina by alternating between walking and running. The blend of walking and running together reduces the overall impact and risk of injury, keeps your body guessing, and prepares you to go the distance. By the end of the program, you will be stronger and healthier than you have ever been. You'll be a 10K runner! Turn on our award winning music and just press start! Our audio coach will guide you through your run! It's that easy! ≈ Less is More ≈ ◎ First week free! Easy to learn. Just press start! ◎ Ideal for beginners. ◎ 14 weeks total. ≈ Features ≈ ◉ Easiest 10k program at only 3 times/week ◉ Convenient audio coach and alerts ◉ Map your run at the end of your workout! ◉ Light and dark modes ◉ Integrates with the Health app ◉ Free iPad integration for indoor treadmills ◉ Integrated with Facebook, Twitter, and Instagram ◉ Access to our forums with thousands of veterans and newcomers starting the app. Join the community and meet other runners! ≈ NEW Zen Unlimited Pass - Try it for free! ≈ ◉ Award winning music curated from top DJ's! ◉ Scientifically proven to increase motivation by 35% ◉ Unlimited access to all pro features across ALL Zen Labs Fitness apps ◉ Unlock calories, distance, Apple watch integration, and more ◉ One subscription unlocks all our apps! Questions/comments? Please email us at contactus@zenlabsfitness.com, or visit us at www.zenlabsfitness.com. ≈ Connect ≈ Facebook: @C25Kfree Twitter: @C25Kfree Instagram: @officialc25k Hashtag: #C25K Zen Labs is a proud supporter of the National Breast Cancer Coalition. breastcancerdeadline2020.org Subscription pricing and terms: The subscription will automatically renew unless turned off in your iTunes Account Settings at least 24 hours before current period ends. You can go to your iTunes Account settings to manage your subscription and turn off auto-renew. Your iTunes Account will be charged when the purchase is confirmed. If you subscribe before your free trial ends, the rest of your free trial period will be forfeited as soon as your purchase is confirmed. Privacy Policy & Terms of Use: https://www.zenlabsfitness.com/privacy-policy/ Legal Disclaimer This app and any information given by it or by Zen Labs LLC are for educational purposes only. You should always consult your healthcare provider before beginning any fitness program. C25K® is a registered trademark of Zen Labs LLC

About

Intervals Pro

Create and follow custom interval training routines for various fitness activities. This app offers extensive customization for intervals, alerts, and goals, with seamless integration for Apple Watch and Apple Health.

Highlights
  • Highly customizable intervals (time/distance)
  • Spoken interval names and prompts
  • Standalone Apple Watch workouts
  • Workout history with Apple Health
  • Home screen widgets for quick launch
  • Bluetooth heart rate monitor support
  • Siri Shortcuts integration
Features
Read full description

Custom Interval Training at its best for iPhone, Apple Watch and iPad. Featured by Apple and recommended by fitness instructors, personal trainers, marathon runners, and coaches. Let Intervals Pro guide you through any type of interval workout: HIIT, running, strength training, yoga, stretching, circuit training, boxing, MMA, elliptical, rehabilitation, meditation, 7-minute workouts, and many more. FEATURED BY • Apple - App of the Day in 132 Countries • Apple - Workout with Apple Watch, Quick HIIT Workouts • Women's Health Magazine • COACH Magazine • SixColors.com HIGHLIGHTS • Highly Customizable • Home Screen Widgets to quickly launch timers • Spoken interval names and prompts • Customizable alert sounds • Standalone Apple Watch workouts. Leave your iPhone at home! • Workout History using Apple Health data • View an Apple Watch workout live on your iPhone! • Run in the background with the screen locked • Play music or podcasts using the app of your choice • Bluetooth heart rate monitor support for Apple Watch or iPhone • Fill your Activity Rings • Siri Shortcuts • Share timers with friends • Time and Distance Goals • Running Pace and Heart Rate Targets • Auto pause and resume • Send completed workouts to Strava • Confetti! PERSONALIZE YOUR WORKOUT • Customize the Name, Duration, Alert, and Color for each interval • Customize Alert Sounds and Voice Prompts to guide you through your workout • Set a Countdown Alert and vibrations when the interval is about to end • Optional halfway alert • Set target heart rate ranges for each interval • Set time and distance goals FLEXIBLE INTERVAL DURATIONS • Time based (e.g., 45 seconds) • Distance-based (e.g., 0.5 MI or KM) • Count up intervals keep running until your ready for the next interval • Estimated time or distance. Count down time or distance to zero and then continue the interval, counting up until you're ready to move on. THE BEST APPLE WATCH INTERVAL TIMER • Leave your phone at home with our standalone Apple Watch app • Control your music or podcasts on the "Now Playing" screen • View an Apple Watch workout live on your iPhone • Alert Sounds and Voice Prompts to guide you through your workout • Configurable haptic alert countdown that taps you on the wrist when the interval is ending • Track heart rate, calories, distance, and pace • Route tracking for running, walking, and cycling • Workouts contribute to the Apple Watch Activity Rings WORKOUT HISTORY USING APPLE HEALTH • Intervals Pro has the best Apple Health integration of any interval training app • Track heart rate, calories, distance, and pace • Route tracking for running, walking, and cycling • Detailed stats for every interval • All your data is safely stored in Apple Health GREAT FOR RUNNING AND CYCLING • Interval duration can be set to either a specified time or distance • Display current pace, pace for the interval, or pace for the entire run • Configure heart rate ranges per interval • Analyze each interval of your run in the workout history MULTIPLE VOICES AND LANGUAGES • Select the language and voice to use for all spoken alerts. • Spoken alerts are localized to 10 languages. Chinese (simplified), Danish, Dutch, French, German, Italian, Norwegian, Polish, Spanish, and Swedish. Get Intervals Pro today, and your workouts will never be the same! SUBSCRIPTION INFO Intervals Pro is free to download and has a free timer. To create multiple timers and unlock all the features of the app, you may choose between a monthly or yearly auto-renewing subscription option. Upon confirmation of the purchase, payment will be charged to your credit card through your iTunes account. Subscription renews automatically unless canceled at least 24 hours before the end of the subscription period. Subscriptions can be managed and auto-renewal turned off in Account Settings in the App Store app. Privacy Policy and Terms of Service: https://intervalspro.com/privacy-policy.html

Screenshots

10K Trainer by C25K®4 screens
Intervals Pro4 screens

Verdict

The call

The clearest difference is ads: Intervals Pro at none against 10K Trainer by C25K®'s shown. Intervals Pro also leads on update cadence (every 8 days vs every 6 weeks) and review sentiment (84% vs 76%). 10K Trainer by C25K®'s advantage is iOS requirement (14.0 vs 17.5). On price, rating, ratings volume and in-app purchases 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. 10K Trainer by C25K® sells 6 in-app purchases, starting at $4.99 per month and Intervals Pro sells 8 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for 10K Trainer by C25K® against 4.8 for Intervals Pro. Both are backed by a comparable volume of ratings — 22K and 14K respectively. Written reviews are what separate them: 76% of 10K Trainer by C25K®'s written reviews are positive against 84% of Intervals Pro's.

UpkeepUpdate frequency

10K Trainer by C25K® ships an update every 6 weeks, Intervals Pro every 8 days. Both last shipped on October 20, 2026.

Scorecard4 real differences · 6 level
10K Trainer by C25K® versus Intervals Pro: the parameters behind the verdict, then further details
Parameter10K Trainer by C25K®Intervals Pro
PriceFreeFree
Rating4.8 (22K ratings) — better4.8 (14K ratings)
Positive reviews76.2% of reviews84.3% of reviews — better
Number of ratings22K — better14K
Update frequencyEvery 6 weeksEvery 8 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, Apple Watch
Requires iOS14.0 — better17.5
Further details — not scored
Size321 MB69 MB
Age rating4+4+
DeveloperZen LabsIntervals, LLC

Customer experience

10K Trainer by C25K®

All ratings21,551 ratings
Positive95.8%
Neutral2.0%
Negative2.2%
Written reviews420 reviews
Positive76.2%
Neutral6.2%
Negative17.6%

Intervals Pro

All ratings13,612 ratings
Positive95.1%
Neutral1.7%
Negative3.2%
Written reviews1,085 reviews
Positive84.3%
Neutral4.9%
Negative10.8%

User reviews

10K Trainer by C25K®

From 22K App Store ratings

What we love

  • 🚀 Gradual increase in running challenges
  • 👍 Motivating and easy to follow
  • 👍 Helpful for beginners and returning runners
  • 👍 Allows listening to own music
  • 👍 Provides voice prompts for guidance

Room to improve

  • 🐛 Inconsistent tracking of distance and calories
  • 🐛 Occasional app crashes or freezes
  • 🔋 Drains battery when running with phone
  • 👎 Requires subscription for advanced features

Intervals Pro

From 14K App Store ratings

What we love

  • 👍 Customizable timers and intervals
  • 🚀 Seamless Apple Watch integration
  • 💪 Helps with fitness goals and training
  • 🔍 Detailed workout tracking and analytics
  • 🎨 Intuitive and user-friendly interface

Room to improve

  • 🐛 Occasional sync and connectivity issues
  • 🔍 Lack of clear guidance and documentation
  • 💰 Paid version required for full functionality

Bugs and requests

10K Trainer by C25K®

Reported bugs

2 issues
  • Timers not syncing accurately with other devices
  • Workout data sometimes not recorded properly

Requested features

3 requests
  • Apple Watch integration for standalone use
  • More advanced training options beyond just 10K
  • Ability to customize audio prompts and volume

Intervals Pro

Reported bugs

2 issues
  • Workout data not syncing correctly
  • App crashes or freezes on certain devices

Requested features

3 requests
  • More customization options for interval displays
  • Ability to batch delete or manage workout history
  • Integration with more third-party fitness apps

In-app purchases

6 purchases

10K Trainer by C25K®

Subscriptions4
  • Zen Unlimited Pass Monthly1 Month trial$4.991 Month
  • Unlock Your Potential7 Days trial$29.993 Months
  • Unlock Your Potential1 Month trial$29.993 Months
Show 1 more
  • Zen Unlimited Pass Annual7 Days trial$74.991 Year
One-time2
  • Remove Ads$1.99
  • Go To Pro$6.99
8 purchases

Intervals Pro

Subscriptions2
  • Monthly Membership7 Days trial$2.991 Month
  • Yearly Membership7 Days trial$19.991 Year
One-time6
  • Generous Tip$0.99
  • Awesome Tip$1.99
  • Massive Tip$4.99
Show 3 more
  • Amazing Tip$9.99
  • Intervals Pro (Legacy)$69.99
  • Lifetime Access$69.99

Questions

Is 10K Trainer by C25K® free?
10K Trainer by C25K® is free to download, with in-app purchases available.
Is Intervals Pro free?
Intervals Pro is free to download, with in-app purchases available.
Which has better reviews, 10K Trainer by C25K® or Intervals Pro?
10K Trainer by C25K® is rated higher. 10K Trainer by C25K® averages 4.8 out of 5 from 22K ratings, while Intervals Pro averages 4.8 from 14K ratings.
Do 10K Trainer by C25K® or Intervals Pro have ads?
10K Trainer by C25K® shows ads; Intervals Pro does not.
Which is updated more often, 10K Trainer by C25K® or Intervals Pro?
10K Trainer by C25K® ships an update every 6 weeks, and Intervals Pro every 8 days. Most recently, 10K Trainer by C25K® was updated on October 20, 2026 and Intervals Pro on October 20, 2026.

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