Comparison

Half Marathon 13.1 Trainer vs RunIntervals

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

Head to head
About

Half Marathon 13.1 Trainer

This app guides beginners through a 14-week program to train for a half marathon using a run-walk method. It offers audio coaching, progress tracking, and community support to help users complete their first 13.1-mile race.

Highlights
  • 14-week run-walk training program
  • Audio coach and alerts
  • Run mapping
  • Health app integration
  • Community forums
  • Music integration
Features
Read full description

■ The Official Half Marathon Trainer App ■ 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! From the same makers of the #1 C25K® Trainer app, Half Marathon Trainer follows the same successful recipe to create an easy simple 13.1 (21k) program. Ideal for first-time beginners and those who are new to running a half marathon. The program uses a blend of running and power walking in training and racing. You’ll soon be able to run-walk the entire half marathon. ≈ Free Trial ≈ ◉ Train the first week for free! ◉ Train to complete a full 13.1 (21k) half marathon using a RUN/WALK ratio ≈ 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. This proven 14 week plan is designed for beginners. The run/walk breaks help make the full marathon less grueling and reduces the overall impact and risk of injury. Don’t think that just because walking is involved that your time will be slower or that you'll be accomplishing less. Many veteran runners have posted personal best times after switching to this run walk method! Using a ratio of running and walking will better manage your fatigue and give you the muscle resource and mental confidence to handle the later parts of the race. 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 ≈ ◎ Easy to learn. Just press start! ◎ Ideal for beginners. ◎ 14 weeks total. ≈ Features ≈ ◉ Proven 14 week half marathon training run-walk program (1st week free) ◉ Convenient audio coach and alerts ◉ Map your run at the end of your workout! ◉ Light and dark modes ◉ Health app integration ◉ 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 running apps ◉ Unlock calories, distance, Apple watch integration, and more ◉ Full access to C25K, 10K, 13.1, and 26.2 programs ◉ 4 apps for the price of 1! One subscription, multiple apps! Questions/comments? 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/ Apple Standard Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ 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

RunIntervals

Set custom interval timers with voice or tone alerts. This app seamlessly integrates with your existing audio and fitness apps, pausing or lowering music volume to ensure you never miss an alert.

Highlights
  • Customizable interval durations
  • Voice and tone alerts
  • Music volume lowering
  • Spoken audio pausing
  • Works with other apps
  • No user data collection
Features
Read full description

Just pick your interval durations and click GO! "Plays well with others," so if you have favorite apps for audio or fitness tracking it will work well alongside those. Audio voice alerts or tones will momentarily lower the volume of your music or briefly pause spoken audio just long enough to hear the alert, then let you get right back to listening! This app does not track or collect any user data.

Screenshots

Half Marathon 13.1 Trainer4 screens
RunIntervals2 screens

Verdict

The call

Half Marathon 13.1 Trainer and RunIntervals both sit at 4.7 stars, but that hides the real split: 91% of RunIntervals's written reviews are positive against 56% of Half Marathon 13.1 Trainer's. RunIntervals also leads on ads (none vs shown) and iOS requirement (11.3 vs 14.0). Half Marathon 13.1 Trainer's advantage is ratings volume (5.6K vs 146) and update cadence (every 6 weeks vs every 3 months). On price, rating, in-app purchases and monetization model 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. Half Marathon 13.1 Trainer sells 5 in-app purchases, starting at $4.99 per month and RunIntervals sells 2 one-off in-app purchases. 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 — 4.7 for Half Marathon 13.1 Trainer against 4.7 for RunIntervals. That said, the two scores are not equally well evidenced: Half Marathon 13.1 Trainer has 5.6K ratings behind it against 146, so its average is the more settled of the two. Written reviews are what separate them: 56% of Half Marathon 13.1 Trainer's written reviews are positive against 91% of RunIntervals's.

UpkeepUpdate frequency

Half Marathon 13.1 Trainer ships an update every 6 weeks, RunIntervals every 3 months. The most recent releases landed on November 3, 2026 and November 2, 2026 respectively.

Scorecard5 real differences · 5 level
Half Marathon 13.1 Trainer versus RunIntervals: the parameters behind the verdict, then further details
ParameterHalf Marathon 13.1 TrainerRunIntervals
PriceFreeFree
Rating4.7 (5.6K ratings) — better4.7 (146 ratings)
Positive reviews55.7% of reviews90.7% of reviews — better
Number of ratings5.6K — better146
Update frequencyEvery 6 weeks — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPod, Apple Watch
Requires iOS14.011.3 — better
Further details — not scored
Size319 MB26 MB
Age rating4+4+
DeveloperZen LabsRobotic Jam LLC

Customer experience

Half Marathon 13.1 Trainer

All ratings5,572 ratings
Positive93.5%
Neutral2.4%
Negative4.1%
Written reviews185 reviews
Positive55.7%
Neutral7.6%
Negative36.8%

RunIntervals

All ratings123 ratings
Positive91.9%
Neutral2.4%
Negative5.7%
Written reviews129 reviews
Positive90.7%
Neutral3.1%
Negative6.2%

User reviews

Half Marathon 13.1 Trainer

From 5.6K App Store ratings

What we love

  • 👍 Easy to use
  • 👍 Helpful for beginners
  • 👍 Great for training and motivation
  • 👍 Integrates well with Apple Watch and Fitness
  • 👍 Customizable music playback

Room to improve

  • 🐛 Occasional syncing and tracking issues
  • 🔋 Drains battery life
  • 💰 Subscription model change frustrates some users
  • 💰 Paid app now requires subscription for full access

RunIntervals

From 146 App Store ratings

What we love

  • 🚀 Perfect app
  • 🚀 Great app
  • 🚀 Simple and effective
  • 🚀 Straightforward and easy to use
  • 🚀 Does exactly what it needs to

Room to improve

  • 🐛 Does not work
  • 🐛 Tones fail
  • 🐛 Alerts don't work
  • 🐛 Stops randomly
  • 🐛 No sound on watch

Bugs and requests

Half Marathon 13.1 Trainer

Reported bugs

3 issues
  • App crashes or freezes during workouts
  • Inconsistent distance and time tracking
  • Syncing issues with Apple Watch

Requested features

4 requests
  • Option to view GPS route history
  • Ability to customize training days and schedule
  • Integration with more fitness tracking devices
  • Detailed performance metrics and analytics

RunIntervals

Reported bugs

3 issues
  • Interval tones not working with podcast/music
  • Interval tones not working on Apple Watch
  • App randomly stops during workouts

Requested features

7 requests
  • Ability to swap run/walk intervals
  • Option to start with walking
  • Ability to set number of repeats
  • Vibration alerts
  • Longer interval options (up to 30/60/120 mins)
Show 2 more
  • Repeat feature for intervals
  • Total time limit for workout

In-app purchases

5 purchases

Half Marathon 13.1 Trainer

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-time1
  • Unlock Workout List$0.99
2 purchases

RunIntervals

One-time2
  • Small Tip$0.99
  • Big Tip$2.99

Questions

Is Half Marathon 13.1 Trainer free?
Half Marathon 13.1 Trainer is free to download, with in-app purchases available.
Is RunIntervals free?
RunIntervals is free to download, with in-app purchases available.
Which has better reviews, Half Marathon 13.1 Trainer or RunIntervals?
Half Marathon 13.1 Trainer is rated higher. Half Marathon 13.1 Trainer averages 4.7 out of 5 from 5.6K ratings, while RunIntervals averages 4.7 from 146 ratings.
Do Half Marathon 13.1 Trainer or RunIntervals have ads?
Half Marathon 13.1 Trainer shows ads; RunIntervals does not.
Which is updated more often, Half Marathon 13.1 Trainer or RunIntervals?
Half Marathon 13.1 Trainer ships an update every 6 weeks, and RunIntervals every 3 months. Most recently, Half Marathon 13.1 Trainer was updated on November 3, 2026 and RunIntervals on November 2, 2026.

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