Comparison

Grey Matter Training vs Coach Kostas Corner

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

Head to head
About

Grey Matter Training

This app offers personalized, science-backed training, nutrition, and supplement guidance for competitive athletes and fitness enthusiasts. It requires a paid coaching plan to access its full features.

Highlights
  • Individualized training plans
  • Evidence-based nutrition guidance
  • Supplementation strategies
  • For physique and strength athletes
  • For training enthusiasts
Features
Read full description

Grey Matter Training is a service providing individualized, evidence-based training, nutrition, and supplementation plans for competitive physique athletes, strength athletes, and training enthusiasts alike. *Requires paid coaching plan Terms of use: https://kahunas.io/terms-conditions Privacy policy: https://kahunas.io/privacy

About

Coach Kostas Corner

Access a comprehensive coaching and transformation mentorship designed for goal achievement. Receive personalized workout and nutrition plans, mindset development tools, and progress tracking to support your journey to a healthier and more successful life.

Highlights
  • Personalized coaching programs
  • Customized workout plans with videos
  • Bespoke nutrition plans with food logging
  • Mindset and self-development blueprints
  • Progress tracking and data logging
  • Messaging and reminders
Features
Read full description

The ultimate coaching and transformation mentorship is all in one app! Succeeding at your goals can't get any more convenient or efficient. The global success of my Trinity Transformation coaching mentorship is now fully accessible 24 hours a day at your fingertips. Clients now have access to all of the tools they need to succeed at their goals with their customized program that connects their tasks, their life, with me at all times. By joining this mentorship you will get access to: PERSONALIZED COACHING PROGRAM A fully tailored program we design together after the initial consultaion with all the directions, tasks, daily/weekly/monthly targets & goals, data logs to track progress or spot obstacles, all of our notes, messaging, voice/video recordings, alarms/reminders we can both set to make consistency/accountability much easier to attain and more upgrades monthly as the app gets better and better. PERSONALIZED WORKOUT PLANS No matter what the goal is, what capability or level the client has, or what access to fitness they can reach… every client will have a customized training plan in detail with instructional videos. All progress can be tracked/logged/adjusted 24-7 for all disciplines of (resistance training/sport/cardio/stretching & breathing). HEALTH IS WEALTH, a strong healthy body is one of 3 major pillars in the Trinity Transformation and we make sure you are gifted it. BESPOKE NUTRITION PLANS Thats right, I personally will customize a nutrition plan to meet all your goals. Wether general health, fat loss, muscle gain, sport specific performance needs, allergies, HRT, pre/post natal, improving health markers or getting off medications: its all covered and tailored to your lifestyle and preferences. You will be able to track and log your food throughout the day for both of us to see and asses. The app also has 1.4m verified foods in with macros & micronutrients like Fiber, Sugar, Saturated Fat, Polyunsaturated, Monounsaturated and salt. Over 800k barcodes, 3,000+ restaurants and multiple portion options. All foods are 100% verified. You can achieve the health and body you’ve always dreamed of. MINDSET & SELF DEVELOPMENT The roots to the success of this coaching program is skillset and mental/spiritual development of all my clients. I’ve taken all the anecdotal and academic knowledge and experience of the past two and half decades, put it together into simple blueprints for others to follow to be able to overcome ANY obstacles and achieve the life they desire. I am living proof of doing out the other side of life hardest, most difficult tragedies and adversities winning and consistently progressing. Myself and the successful clients of this mentorship walk the talk, these are bulletproof systems to help one achieve the highest level of physical, mental and financial achievements. ALL OF YOUR NEEDS as a customer will be met with effeciency and precision. NO need to fumble with emails/ pdfs/ saved videos or pics/ notes/ assessments/ billing/ scheduling or anything. This app with my guidance and our team work guarentees optimal results. Various options apply with our Platinum, Gold and Silver packages all explained on the website menu page “Packages” MEMBERSHIP & Payment packages will be confirmed during the Consultation Video/Phone call, one client confirms package choice www.trinitytransformation.net I look forward to joining you on creating the best version of you and your abundant future forward! * App access requires paid coaching plan Terms of use: https://kahunas.io/terms-conditions Privacy policy: https://kahunas.io/privacy

Screenshots

Grey Matter Training3 screens
Coach Kostas Corner3 screens

Verdict

The call

Grey Matter Training and Coach Kostas Corner are too close to call on the numbers: across 9 compared parameters — price, rating, ratings volume and update cadence among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. Grey Matter Training sells 1 in-app purchase, starting at $399.99 per month and Coach Kostas Corner sells 1 in-app purchase, starting at $200.00 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 — 5.0 for Grey Matter Training against 5.0 for Coach Kostas Corner. Both are backed by a comparable volume of ratings — 3 and 2 respectively.

UpkeepUpdate frequency

Grey Matter Training ships an update monthly, Coach Kostas Corner every 2 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

ScorecardNo meaningful differences
Grey Matter Training versus Coach Kostas Corner: the parameters behind the verdict, then further details
ParameterGrey Matter TrainingCoach Kostas Corner
PriceFreeFree
Rating5.0 (3 ratings)5.0 (2 ratings)
Positive reviews—100.0% of reviews
Number of ratings3 — better2
Update frequencyMonthly — betterEvery 2 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size47 MB51 MB
Age rating17+17+
DeveloperMichael WhiteKonstantinos Kopsinis

Customer experience

Grey Matter Training

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Coach Kostas Corner

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Grey Matter Training

Subscriptions1
  • Monthly Coaching$399.991 Month
1 purchases

Coach Kostas Corner

Subscriptions1
  • Monthly Coaching$200.001 Month

Questions

Is Grey Matter Training free?
Grey Matter Training is free to download, with in-app purchases available.
Is Coach Kostas Corner free?
Coach Kostas Corner is free to download, with in-app purchases available.
Which has better reviews, Grey Matter Training or Coach Kostas Corner?
Grey Matter Training and Coach Kostas Corner are both rated 5.0 out of 5 on the App Store, from 3 and 2 ratings respectively.
Do Grey Matter Training or Coach Kostas Corner have ads?
Neither Grey Matter Training nor Coach Kostas Corner shows ads.
Which is updated more often, Grey Matter Training or Coach Kostas Corner?
Grey Matter Training ships an update monthly, and Coach Kostas Corner every 2 months. Most recently, Grey Matter Training was updated on November 3, 2026 and Coach Kostas Corner on October 30, 2026.

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