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Updated July 2026 · real, multi-region App Store reviews
Head-to-head

Fitness AI Gym Workout Planner vs Muscle Booster Workout Tracker

Fitness AI Gym Workout Planner 4.7★ · Free + IAP 70
Winner Fitness AI Gym Workout Planner
Muscle Booster Workout Tracker 4.5★ · Free to download 60

Fitness AI is a better choice for dedicated weightlifters who want detailed tracking and progressive overload, while Muscle Booster is better for those seeking varied home workouts, including chair exercises, despite its billing issues.

Full reviews: Fitness AI Gym Workout Planner · Muscle Booster Workout Tracker

Fitness AI offers robust workout tracking and progressive overload features, but faces significant criticism for subscription cancellation difficulties and in-app ads for paying users. Muscle Booster provides diverse workout programs, including options for seniors, but is plagued by billing complaints and inconsistent app functionality.

Head to head

Features & Workout Variety edge: Fitness AI Gym Workout PlannerR3R6R9R12
Fitness AI Gym Workout Planner Fitness AI is highly praised for its ability to track workouts, facilitate progressive overload, and provide suggestions for increasing weight R6. Users appreciate the detailed diagrams and the app acting like a 'gym partner' . However, it lacks variety in cardio, kettlebell exercises, and the ability to add custom exercises R3R9R15R19. Some users also report issues with specific features like the body scan R12 and tracking for isometric exercises .
Muscle Booster Workout Tracker Muscle Booster offers a wide range of workouts, including specialized programs like Chair Tai Chi, which is highly valued by seniors and those with mobility issues . Users appreciate the video assistance and tailored workouts . However, some find the workouts repetitive R61 and note a lack of weight tracking for progress . There are also complaints about the AI voice being robotic and uninspiring , and some users feel the chair workouts are not as prominent as advertised .
Ease of Use & Reliability tieR6R15R19R30
Fitness AI Gym Workout Planner Fitness AI is generally seen as convenient for tracking lifting sessions R15. However, recent updates have introduced significant usability issues, including spammy full-screen pop-ups for paying users R6R19R46R52, and bugs preventing users from logging workouts, adding exercises, or starting new days . Some users also report glitches with navigation and the app requiring an internet connection R30.
Muscle Booster Workout Tracker Muscle Booster offers easy-to-follow plans with video assistance . However, it suffers from various glitches, including videos not running, Apple Watch syncing issues, and sound problems R81. Users also report the app freezing and the countdown timer being out of sync . Some find the interface harder to navigate on smaller screens and note that the app's functionality can change unpredictably with updates .
Price & Value tieR4R6R10R13
Fitness AI Gym Workout Planner Fitness AI is considered expensive by many, with annual subscriptions costing around $90 R4R10R13R43. Users are frustrated by the app being listed as 'free' but immediately paywalling features . There are also complaints about additional charges for features like the body scanner and pop-up ads even for paid users R6R46R52.
Muscle Booster Workout Tracker Muscle Booster is also seen as expensive, with monthly fees around $20 R61. Many users report being charged unexpectedly after free trials or for auto-renewals they tried to cancel . Some feel the value doesn't match the price, especially given the basic nature of some workouts .
Customer Support & Billing Practices tieR1R4R7R10
Fitness AI Gym Workout Planner Fitness AI receives widespread criticism for its lack of customer support and difficulty in canceling subscriptions R1R4R10R13. Users report being unable to cancel through the app, website, or even Apple settings, leading to unauthorized charges R1R4R10R13. There are also reports of being charged immediately after a free trial R16R43 and issues with restoring subscriptions R7. While one user praised responsive customer service , this is an outlier.
Muscle Booster Workout Tracker Muscle Booster also faces severe criticism for its billing practices and customer support. Users report being charged automatically after trials or cancellations, with refunds being difficult or refused . The app is accused of avoiding Apple's subscription service and billing directly, leading to bank fraud flags . Support is often described as automated, unhelpful, or non-existent . However, some users did report positive experiences with customer service, including quick responses and assistance with accidental double subscriptions .
Pick Fitness AI Gym Workout Planner if

You are primarily focused on weight training and progressive overload, appreciate detailed tracking, and are willing to navigate potential customer service and billing frustrations R6.

Pick Muscle Booster Workout Tracker if

You are looking for varied home workouts, including options for seniors or chair exercises, and prioritize a wide range of programs, but are prepared to closely monitor your subscriptions and billing .

Evidence note: Both apps have a significant number of recent negative reviews regarding billing and subscription cancellation, which heavily skews their recent sentiment compared to their higher lifetime ratings. The free-to-download model for both apps likely contributes to this, as users are drawn in by a free trial and then encounter issues with paid subscriptions.

Frequently asked

Can I cancel my subscription easily with Fitness AI or Muscle Booster?
No, many users report significant difficulty canceling subscriptions for both Fitness AI and Muscle Booster, often leading to unauthorized charges (R1, R4, R13, R25 for Fitness AI; , , , for Muscle Booster).
Do these apps offer free trials?
Yes, both apps advertise free trials, but many users report being charged immediately or unexpectedly after the trial ends, with Fitness AI charging around $90 annually and Muscle Booster having various charges including $20 monthly or higher annual fees (R4, R16, R43 for Fitness AI; R61, , , for Muscle Booster).
Are there ads in these apps?
Fitness AI users, even paying subscribers, frequently complain about intrusive full-screen pop-up ads and promotions R6R19R46R52. Muscle Booster reviews do not mention in-app ads, but focus on billing issues.
Do these apps integrate with Apple Health or Apple Watch?
Fitness AI users report that workouts do not record to Apple Health even when settings are turned on R36, and there's a desire for Apple Health integration in a beta version R60. Muscle Booster users experience issues with the app not syncing with Apple Watch R81 and a lack of full integration with the Activity App R84.

What reviewers actually said

Built only from these 120 real reviews (foreign ones translated). Superscripts jump to the quote here. Apple has no per-review links, so [ref] opens that app's reviews on the App Store.

  1. [R3] Fitness AI Gym Workout Planner 3/5 · US Needs more cardio: If you like to incorporate cardio to your workout, this is not the greatest app. Overall, great selection for weight training.
  2. [R6] Fitness AI Gym Workout Planner 3/5 · US Good app but stop spamming me every time I open it: I like this app. I pay for this app. It genuinely helps you progressively overload and incrementally track your progress in visual, easy to understand. BUT every time I open the app it serves me the same full screen takeover pop up promoting something. If I pay for this app I should be seeing no promotions, especially that take over the full scre
  3. [R9] Fitness AI Gym Workout Planner 3/5 · US 4 star!: Great app for tracking workouts, I’ve used it twice so far. One star less, though. I wish they had more kettlebell exercises; there are only five in the app. It would also be great if there were a way to add our own exercises that aren’t part of their database.
  4. [R12] Fitness AI Gym Workout Planner 3/5 · US Dysfunctional features: The body scan feature malfunctions.
  5. [R15] Fitness AI Gym Workout Planner 3/5 · US Convenient but no support: This app is so convenient and not having to record my lifting sessions, but there is absolutely no live support. If I want to engage in certain exercises that are not on the app, it’s very hard to record. For example, there are no Bulgarian split squats, B stance RDL‘s. Glut trainer machines. I wish there was a way to add my own exercise exercises that are not in the lis
  6. [R19] Fitness AI Gym Workout Planner 1/5 · US Ruining a good thing: I use to love this app but you are disappointingly destroying what made it good, which was simplicity and distraction free design. Now you are spamming me with stupid challenge pop ups that I have to x out of every time I open the app. Also I had messaged support a little while back that the one thing that would make this app better would be the ability to add custom exerci
  7. [R30] Fitness AI Gym Workout Planner 3/5 · US Eh: Good exercises however the Pp requires an internet connection and where im aint i dont always have internet
  8. [R4] Fitness AI Gym Workout Planner 1/5 · US CANT CANCEL: I got the free trial of this app, but I did not want to proceed with the membership, this app has no option to cancel membership within app, or even through the website. I couldn’t even cancel it through my settings/account/subscriptions. I receive no email on my confirmation of free trial or subscription. I ended up getting charged $90 for an app and membership I don’t want, I do not
  9. [R10] Fitness AI Gym Workout Planner 1/5 · US Stop charging me: Hello - I continued to receive a charge for a $89.99 subscription but I do not have an active account with your company. Please have someone in your customer service department reach out to me.
  10. [R13] Fitness AI Gym Workout Planner 1/5 · US Scammers: The don’t you option to cancel free trial so they can charge you $89 scammers
  11. [R1] Fitness AI Gym Workout Planner 1/5 · US Can’t unsubscribe: I just got charged for a new year’s subscription, but there is no way in the app to cancel and no way to contact the company to cancel the subscription. It isn’t handled by Apple so can’t cancel in the normal way through phone settings. Really sketchy behavior all around. I’d like a refund and a way to cancel so it doesn’t happen again.
  12. [R7] Fitness AI Gym Workout Planner 1/5 · US Scammers: It’s a scam. I just subscribed and they talk to $45 and my application doesn’t start when I try to restore the subscription. It says I have no subscription to restore.
  13. [R25] Fitness AI Gym Workout Planner 1/5 · US Difficult to deactivate: These guys purposely try to make it difficult to deactivate
  14. [R16] Fitness AI Gym Workout Planner 1/5 · US Total scam: Advertise a free trial then charge you immediately. On top of that it’s a terrible app. Do not download or you will be scammed!!!
  15. [R43] Fitness AI Gym Workout Planner 1/5 · US DO NOT EVER GET THIS APP: I pressed the week FREE trial, cancelled it before it ended because I couldn’t understand the app.. a day after my birthday they all all my birthday money $100* out of my account. I made a dispute the following day through apple. They didn’t do nothing. Contacted the app through email they saying they can’t do nothing. lol please do not waste your life on this app. I am a
  16. [R61] Muscle Booster Workout Tracker 1/5 · US Workout: I like some of the workouts but there seems to be a lot of repetition. I don’t like how you can’t go back and see a workout if you missed it. I also don’t want to pay $20 a month.
  17. [R46] Fitness AI Gym Workout Planner 1/5 · US THE ONE: PLEASE STOP SHOWING ME ADS IN AN APP I PAY FOR I have tried sooooo many fitness apps, and after 4 years, I think I have found that one that will make a difference. To give some context, I am a 21 year old male that is 140 pounds and I am looking to gain weight by building muscle. After only a month of using this app I am already noticing a difference, and people around me are too. This
  18. [R52] Fitness AI Gym Workout Planner 2/5 · US Spammy Pop-Ups for Paid Users 👎🏻: Really disappointing that as a paid user for SEVERAL years (5 to be exact) I started getting pop-ups every time I open the app. It looks tacky and should not be the experience for users paying $60+ per year for an app.
  19. [R36] Fitness AI Gym Workout Planner 3/5 · US Not the best: I don’t like that the workouts will not record to the health app on iPhone even though you have the setting turned on. Simple exercises like Step Ups are not an option. Glute and leg exercises need to be separated and not grouped together. It is supposed to tell you what weight and reps it recommends depending on the last time you did the exercise and it does it sometimes but not alw
  20. [R60] Fitness AI Gym Workout Planner 3/5 · GB Half decent: Half decent app but until the new beta version supports apple health integration it’s nowhere near its full potential unfortunately
  21. [R81] Muscle Booster Workout Tracker 3/5 · US Program is OK: The program is OK only. I’ve noticed there’s allot of glitches in the app. Several times on the Tai Chi section , I had an error and couldn’t run the video. And this morning doing the regular exercises, it didn’t sync with my Apple Watch which it normally did. At times there was no sound. If these glitches keep happening, it’s not worth the subscription. I’m have the latest updates
  22. [R84] Muscle Booster Workout Tracker 3/5 · GB App is great, but no integration with Activity App: Just want to say the contents in terms exercises and the workout plans are great, also like how it adjusts to injuries or specific pains. However, technologically speaking, I would expect full integration with the Activity App, which is not happening right now. So therefore I cannot give it more starts unfortunately.

Synthesized from 120 recent App Store reviews · updated July 2026 · View on the App Store