# Half Marathon Trainer: 21K Run — Half marathon training 13.1 mi

> Guided 12-week half marathon training program with audio coaching and progress tracking. (iPhone/iPad app by FITNESS22 LTD.)

- Source: https://appshunter.io/ios/app/half-marathon-trainer-21k-run/id521810715 (this page in markdown: same URL + `.md`)
- Developer: [FITNESS22 LTD](https://appshunter.io/developer/383171664)
- Category: Health & Fitness
- Price: Free with in-app purchases
- Rating: 4.80/5 from 1,678 App Store ratings · 216 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 101 MB
- Languages: Danish, Ukrainian, Russian, Croatian, Catalan, Hungarian, Afrikaans, Norwegian Bokmål, Indonesian, Turkish and 22 more
- Released: 2012-05-16
- Data updated: 2026-08-26
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/half-marathon-trainer-21k-run/id521810715/reviews.md

## What is Half Marathon Trainer?

The Ultimate 1/2 Marathon training app: 21K Runner is the easiest and most successful program for training for your first 21K.  21K Runner improves your fitness with an awesome training program. You start with a 10K fitness level, and the running gradually increases to a full 21K. Just plug in your headphones, play your favorites music, and the app will guide you.

Motivation is the key factor in long distance running, and 21K Runner keeps you motivated - it's the true magic of this app, and it's built into every screen.  The running plan is achievable and enjoyable, the app keeps a log of your runs & achievements and awards you with badges, and you can also share your progress with your friends on Facebook, Twitter, or by mail. It even includes the motivational quotes to keep your spirit in tune with your body.

This app keeps people running. Built by pros and with proven success, this is the ULTIMATE half marathon training app. 


----- FEATURE LIST -----

12 WEEK RUNNING PROGRAM
● from 10K to 21K
● alternating walks and runs
● starts easy and slowly increases the runs
● audio coach tells you when to walk / run
● works with the screen locked (dark)
● repeat workouts whenever you want
● audio Coach can be voice, beeps, or both
● continue 21K running forever

MUSIC / INDOOR-OUTDOOR
● listen to your music during exercises
● audio coach gently blends in when needed
● on-screen controls for Apple music app
● great with all music apps
● works outdoors / indoors / treadmill

GPS & APPLE HEALTH
● Built in GPS & Distance Tracking, also when app is in background
● Integrated with Apple Health for Calorie calculation & saving workouts

WINS / ACHIEVEMENTS
● each completed run is a Win
● receive Badges for your progress
● app tracks & logs each time you do a new run
● wins screen shows your history & Badges
● share Wins / Badges with your friends on Facebook, Twitter, email

AND THERE'S MORE
● guidance & information for beginners.
● extensive answers to all common questions.
● links to stretching & warmup videos.
● works outdoors / indoors / treadmill
● works perfectly even if your device is locked
● works perfectly also in background
● male & female audio coaches
● flips upside down to fit any armband
● and there is more...


====== NEWS COVERAGE & REVIEWS ======

Our apps have been featured on
CNN, Fox, USA Today, Times, Fitness Channel, AppAdvice, AppCraver, Best10Apps, Appolicious, AppOfTheDay,  Apple's "New & Noteworthy" MakeUseOf, the iPhone App Review, Remix Your Health, AppShopper, Daily Motion, and so many others…

"If you thought that you could never run - get ready for a BIG surprise. With this app - you will run"

"Its a great App, I was hooked by the second run, and it kept me running"

"One of the best iPhone running apps I’ve tested." 

"This application is a must-have fitness trainer for anyone trying to catch the running bug or getting ready for a major running event"


● Privacy Policy & Terms Of Use: 
https://www.fitness22.com/privacy-policy
https://www.fitness22.com/premiumsubscriptionterms

● In App Purchases: 
This App Offers In App Purchases Titled "Premium Upgrade"
• Premium Upgrade: includes full training plans and exercises, as well as plan updates
• The upgrade is either a 6 Month subscription, or a lifetime one time upgrade.
• Payment will be charged to iTunes Account at confirmation of purchase
• Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period
• Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal
• Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase
• Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable


----- CONTACT US -----
Dear customers, we are here for you!  
support@fitness22.com

## Key features

- 12-week running program from 10K to 21K
- Audio coach for walk/run intervals
- Music integration with audio coach blending
- GPS and distance tracking
- Apple Health integration
- Wins and badge achievements
- Beginner guidance and FAQs

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium Subscription | $7.99 | per 6 months |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime Premium | $14.99 | one-time |


## What do users think of Half Marathon Trainer?

Overall sentiment: neutral

**Pros**

- 🚀 Easy to follow training plan
- 👍 Effective for building up to half marathon
- 👍 Variety of workouts (running, intervals, strength)
- 👍 Motivating and keeps user on track
- 👍 Works well with music playback

**Cons**

- 🐛 Inconsistent audio prompts and notifications
- 🐛 Frequent issues with saving/tracking runs
- 🐛 Glitches and crashes
- 🔒 Lack of Apple Watch integration
- 👎 Less features and guidance compared to 5K/10K apps

**Commonly reported bugs**

- Runs not consistently saving
- App freezing and crashing
- Inaccurate distance/time tracking

**Most requested features**

- Add more audio/visual cues and encouragement during runs
- Improve run tracking and data logging
- Integrate with Apple Watch
- Provide more training guidance (pace, distance, etc.)
- Allow manual entry of treadmill runs

## Recent user reviews (10 of 216)

All indexed reviews: https://appshunter.io/ios/app/half-marathon-trainer-21k-run/id521810715/reviews.md

### 3/5 — It’s okay, not great

*2026-08-02, version 8.004*

I wish it operated like their 10K runner app. I enjoy hearing the feedback in the 10K app (length of time running, motivation, etc.). The 21k also won’t stay on or give cues if I don’t leave my screen on, but the 10K runner would. IMO the app could definitely be improved

### 5/5 — Couch to Ironman

*2026-05-22, version 8.004*

This app has been an integral part of taking a 300lb person who could not jog 0.05 miles to a 200lb tri-athlete who is able to now compete in 1/2 Ironman events. Next is the full Ironman. Thank you for keeping me healthy through this journey by pacing my capacity!!!

### 1/5 — Not Good

*2025-06-19, version 8.004*

The app has several glitches. Sometimes it stops working, stops tracking, restarts run, and doesn’t save a run. It can be very frustrating and I’ve given up on it. I’d say steer clear and save yourself some frustration.

### 1/5 — Save your money!

*2025-06-18, version 8.004*

Very disappointed with this app! Half the time the beeps and voice don’t work, the other half it skips ahead half way through the run cycle or restarts for no good reason. Can’t use it on Lock Screen because then the notifications don’t work. Tried contacting help and support and they were absolutely no help at all. 
FIX YOUR APP!! People are paying good money based on how awesome the 5k and 10K apps are but the 21K is useless!

### 2/5 — 21km app

*2025-04-25, version 8.004*

Disappointing that it doesn’t count up in 5min increments as the 10km app does

### 5/5 — Love it..

*2025-04-19, version 8.004*

Had this suite of Apps for YEARS now and I just keep cycling thru them. Easy progression, you can go back n forth. Connects to watch n it’s just tells you when to run n walk. Simple and effective.

### 3/5 — Needs Apple Watch companion app

*2024-12-27, version 8.004*

Would be perfect if it also had an Apple Watch companion app like the 5 and 10K apps do.

### 3/5 — This App Saved My Life

*2024-12-10, version 8.004*

I just wish it would save all my runs!

### 2/5 — It’s not nearly as good as the 10K

*2024-06-22, version 8.004*

Wish it worked as well as the 10K, should have checked to see its last update before purchasing.  Loved the 10K, this one is like a wish version of it.

### 1/5 — Terrible

*2024-05-25, version 8.004*

It won’t let me cancel

## Frequently asked questions about Half Marathon Trainer

### What is the main purpose of this app?

The app is designed to be a comprehensive training program for individuals aiming to run a half marathon (21K). It guides users through a 12-week plan that gradually increases running distance and intensity, starting from a 10K fitness level.

### How does the audio coach work?

The audio coach provides real-time guidance during your runs, telling you when to walk and when to run. It can be set to voice, beeps, or both, and it gently blends in with your music to keep you informed without disruption.

### Does the app track my runs and progress?

Yes, the app includes built-in GPS for distance tracking and integrates with Apple Health to log workouts and calculate calories burned. It also awards badges for achievements and keeps a log of all your completed runs.

### Can I listen to my own music while using the app?

Absolutely. The app is designed to work seamlessly with your favorite music apps. The audio coach will gently blend in when needed, and on-screen controls are available for Apple Music.

### Is this app suitable for beginners?

Yes, the app provides guidance and information specifically for beginners. The training plan starts easy and slowly increases the running duration, making it achievable and enjoyable for those new to longer distances.

## Version history (last 5 releases)

### 8.004 — 2018-09-11

This app has been updated by Apple to display the Apple Watch app icon.

Various updates

### 7.5 — 2017-10-15

iOS 11 Compatibility

### 7.3 — 2016-10-04

- iOS 10 Adaptations

### 6.30 — 2015-09-30

- Minor fixes

### 6.21 — 2015-07-21

Bug Fixes

## Apps similar to Half Marathon Trainer

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Strava: Run, Bike, Walk](https://appshunter.io/ios/app/strava-run-bike-walk/id426826309) | 4.8 (368,635) | Free | Health & Fitness |
| [C25K® 5K Running Coach & Map](https://appshunter.io/ios/app/c25k-5k-running-coach-and-map/id485971733) | 4.8 (170,670) | Free | Health & Fitness |
| [MOTTIV: Run & Triathlon Plans](https://appshunter.io/ios/app/mottiv-run-and-triathlon-plans/id1561001166) | 4.8 (70) | Free | Health & Fitness |
| [Runna: Running Plans & Coach](https://appshunter.io/ios/app/runna-running-plans-and-coach/id1594204443) | 4.9 (33,144) | Free | Health & Fitness |
| [adidas Running: Run tracker](https://appshunter.io/ios/app/adidas-running-run-tracker/id336599882) | 4.8 (106,992) | Free | Health & Fitness |
| [ASICS Runkeeper—Run Tracker](https://appshunter.io/ios/app/asics-runkeeperrun-tracker/id300235330) | 4.8 (377,917) | Free | Health & Fitness |

## More apps by FITNESS22 LTD

- [5K Runner: couch potato to 5K](https://appshunter.io/ios/app/5k-runner-couch-potato-to-5k/id448357306)
- [10K Runner, Couch to 10K Run](https://appshunter.io/ios/app/10k-runner-couch-to-10k-run/id456591673)
- [SuperNote Notes Recorder+Photo](https://appshunter.io/ios/app/supernote-notes-recorder-plus-photo/id484001216)
- [SuperNote Notes Recorder&Photo](https://appshunter.io/ios/app/supernote-notes-recorder-and-photo/id484001731)
- [Push ups: 100 pushups pro](https://appshunter.io/ios/app/push-ups-100-pushups-pro/id556434930)

All apps by FITNESS22 LTD: https://appshunter.io/developer/383171664

## Related topics

[21k half marathon run coach](https://appshunter.io/ios/topics/21k-half-marathon-run-coach) · [half marathon trainer](https://appshunter.io/ios/topics/half-marathon-trainer) · [couch to half marathon](https://appshunter.io/ios/topics/couch-to-half-marathon) · [half marathon running](https://appshunter.io/ios/topics/half-marathon-running) · [half marathon](https://appshunter.io/ios/topics/half-marathon) · [iron man half](https://appshunter.io/ios/topics/iron-man-half) · [half marathon training](https://appshunter.io/ios/topics/half-marathon-training) · [half marathon training free](https://appshunter.io/ios/topics/half-marathon-training-free) · [half marathon training app for beginners](https://appshunter.io/ios/topics/half-marathon-training-app-for-beginners) · [brooklyn half marathon](https://appshunter.io/ios/topics/brooklyn-half-marathon) · [nyrr half marathon](https://appshunter.io/ios/topics/nyrr-half-marathon) · [nyc half marathon](https://appshunter.io/ios/topics/nyc-half-marathon) · [2026 brooklyn half marathon](https://appshunter.io/ios/topics/2026-brooklyn-half-marathon) · [run training runner](https://appshunter.io/ios/topics/run-training-runner) · [tcs sydney marathon](https://appshunter.io/ios/topics/tcs-sydney-marathon) · [marathon 26.2 trainer by c25k®](https://appshunter.io/ios/topics/marathon-26-2-trainer-by-c25k)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*