# Half Marathon Trainer: 21K Run — user reviews > 216 indexed App Store user reviews of Half Marathon Trainer by FITNESS22 LTD, rated 4.80/5 from 1,678 ratings. - Source: https://appshunter.io/ios/app/half-marathon-trainer-21k-run/id521810715/reviews - App overview in markdown: https://appshunter.io/ios/app/half-marathon-trainer-21k-run/id521810715.md - Rating breakdown: 5★ 1,509 · 4★ 84 · 3★ 32 · 2★ 21 · 1★ 32 ## 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 ## Newest reviews (13 of 216) ### 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 ### 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 ### 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. ### 4/5 — Good for training *2024-04-12, version 8.004* I like this app for the training recommendations and cadence of lung runs vs tempo runs. I docked a star as it doesn’t allow you to log partial workouts. If you don’t complete the entire time then it won’t record the run. ### 2/5 — Room for improvement *2024-03-22, version 8.004* Purchased for $60. The adaptive part is that you tell it to advance you in the preset schedule. I want the helpful 5/10minute notifications the 5 and 10K apps offer. This one only dings once at halfway leaving me clueless when I want to gauge how far I have. This app doesn’t offer encouragement. It works by time and not distance. If you can’t finish the final distance in the average time for a MAN then you’re left hanging. The app says congratulations even though I hadn’t run the distance. ### 2/5 — Not Fitness22 5k or 10K trainer *2024-01-10, version 8.004* I completed the Fitness22 5k and 10K trainers and those two apps were identical as far as I could tell (distances notwithstanding). This 21k trainer app not the same as those 2 apps. The audio sounds different (less crisp, I would say possibly even distorted), the cues options are different (no options for every 5 min. marks), and it doesn’t work on silent mode with your phone as far as I can tell. This app also recommends running-off days to do strength training and gives a couple of examples for workouts and if you have certain other apps of theirs it might sync with it (I don’t have those apps so I can’t confirm). If this were the 21k version of the 5/10k trainer apps, in my opinion it would be 5-stars. I haven’t completed this program yet but this far I’m not impressed. Will I continue with the app? Probably. ### 2/5 — Good app but…. *2023-10-19, version 8.004* I’ve used the 5k and 10K and they were great but they haven’t synced this one with the Apple Watch so you have to carry your phone with you to run which doesn’t work on these longer distances as I’m carrying water etc. and I don’t do a big phone like this with an arm band. They would be 5 stars if you could use your watch. Same as the 10K pacer ### 2/5 — Forgets my progress *2023-09-05, version 8.004* I like the app for its training plan and badges, but it keeps forgetting my progress and customer support doesn’t get back to me. ### 2/5 — Easy to follow but glitchy *2023-06-17, version 8.004* After using the couch to 5k version of this app I wanted to follow a training plan to comfortably run a HM. The app could do with more advice for strength training as there is none, and more variation including hills, fartlek, pace changes. I am only four weeks in and finding that the plan is a bit boring and having to find my own ways of mixing it up. Each time I open the app I seem to lose anything up to 3-4 days progress and have to declare once more ‘I did it’. They say if you buy cheap you buy twice and I now feel I should have opted for one of the more expensive apps. ### 4/5 — Love this app but *2023-06-16, version 8.004* Love this app well planned runs but find it’s started to not store my run data and twice it would not open. Not big issues just frustrating as having to keep a manual record of where I am at but overall good app and good value ### 2/5 — I want to love this app *2023-06-11, version 8.004* I have used the 5k & 10K Runner and loved them. I recommend them all of the time to new runners. However, the 21K Runner is glitchy. I have deleted and reinstalled just to be sure it is up to date. 1. My runs are not saved. I will complete a day of a run and it’s is in my history, however when I return the next today to choose that days run or rest almost all the runs are no longer checked off as complete. I try to manually go back and enter that “Did It” and it appears to work until the next day and they’re all gone again. This is super annoying when you’re trying to stay on track and aren’t sure what hat day you’re on. 2. The voice prompts are glitchy in that they don’t always prompt during a run. Sometimes they do and sometimes they don’t. If it weren’t for my watch sometimes I wouldn’t even know there was a prompt. My ringer is not turned off so there isn’t any reason I can find for this to happen. 3. Unlike the other two apps there are rest days to check off. That is the most annoying thing. Especially when it doesn’t save that you’ve done it. Remove the rest days. Just instruct people to test every other day or do a strengthening workout on no run days but PLEASE remove the rest days. It feels inconsistent and I know there is a method for short run, interval run, long run. Knowing this helps me plan my runs but it took me too long to figure out the rhythm because of the rest days and random 2 days of rest which I really dislike. As I said, I loved the previous app but this one isn’t working out like I’d hoped and I am on the lookout now for a better one. ## Most critical reviews (10 lowest-rated) ### 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! ### 1/5 — Terrible *2024-05-25, version 8.004* It won’t let me cancel ### 1/5 — Skip the 21 km app *2024-01-30, version 8.004* I loved their 5 and 10 km apps - got me into running and worked well but unfortunately this app is super glitchy, and no follow-up from their support centre when asked. ### 1/5 — Apple Watch *2023-12-27, version 8.004* This app does not connect to Apple Watch !!!! ### 1/5 — Doesn’t consistently save runs, lots of bugs *2023-10-09, version 8.004* 10K app worked better. I’ve been fighting with this app for the last 4 months, it keeps dropping saved runs and progress. Sound cues seem inconsistent. ### 1/5 — Does work with Apple Watch *2023-08-14, version 8.004* The app is not compatible with Apple Watch and is doesn’t consistently save workouts. ### 1/5 — Deletes runs after closing *2023-08-12, version 8.004* Loved the 5k and 20k versions. The 21k version saves some of my runs but deletes others. I just finished a run, made sure it recorded and saved. Then I hard closed the app and the/opened. Run was gone. It has done this for most of my runs using this app. ### 1/5 — Disappointed *2023-08-01, version 8.004* Every day my progress is wiped clean, stats gone. ### 1/5 — Runs get deleted. No help when contacting support *2023-06-07, version 8.004* This app worked great for a while but the last two weeks, every single run gets deleted so I have no way to track overall miles or see my run history, I’ve reached out through the app support team multiple times and have not heard back ## Most praised reviews (10 highest-rated) ### 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!!! ### 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. ### 5/5 — Perfect app *2024-05-20, version 8.004* These apps are simple to use, clear instructions and very effective. Instructions about when to turn round at the halfway point particularly so. I’ve used the 5k and the 10k and now on to 21k. Love them. ### 5/5 — Well on my way!! *2024-04-21, version 8.004* LOVE this app!! It is keeping me in check with my prep for half marathon and it’s taking me at a pace that is challenging but comfortable at the same time. When I first started using the app I had to have pauses because my endurance was not the greatest but now I can run at a comfortable pace non stop for 45mins and it’s only been just under 2wks!! ### 5/5 — Audible cues randomly work *2023-09-13, version 8.004* Unlike previous versions of different distance trainers from this developer the audible cues in this version only work randomly. Unfortunately you have to carry your phone in your hand and constantly watch the timer. ### 5/5 — Kim *2023-08-04, version 8.004* Please add a 5 or 10 minute marker as you have done for the 10K runner app. Thanks ### 5/5 — I always use the Fitness 24 Apps for my training *2023-07-19, version 8.004* Love the fitness 24 apps for building up my stamina and pace. Used this one for great north run 2021 and after having another baby glad to be back at it again! ### 5/5 — Miracle worker *2023-06-16, version 8.004* I never thought I could get into running until I found this series of apps. Started with the 5k and now here I am on the 21K. I never would’ve believed it. Try it! ### 5/5 — Anna B *2023-03-25, version 8.004* Love this app. Got me to my goals ### 5/5 — Amazing app *2022-12-08, version 8.004* I’ve gone from couch to 5k, 5k to 10k, and now this app. As a mom of a baby I don’t have the ability to go to the gym so with a jogging stroller and a good diet I have been able to lose 30 lbs. --- *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 2026-09-01.*