Comparison

Grey Matter Training vs Renu by Sam Thai

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

Renu by Sam Thai

Features
Read full description

Renu is the private 1:1 coaching app for clients of Sam Thai. Sam has coached since 2016. He built Renu for people who have trained for years and still don’t have the physique to show for it. Nothing in the app is a template. Everything is built around you and your data. What’s inside Your training. Block-based programming, rewritten as we go based on your real performance and recovery. Travel-week sessions for when life moves. Your nutrition. Your targets and meal structure, built to survive work dinners, travel and weekends. Daily and weekly check-ins. Log your numbers, photos and how the week went. Sam reviews every check-in and replies the same day. Direct messaging. Ask Sam the in-the-moment questions, Monday to Friday. One place for all of it. No spreadsheets, no scattered messages, no guessing what’s next. Please note: Renu is for current clients of Sam Thai. Access comes with your coaching, and places are limited. To apply, visit apply.coachsamthai.com Renu provides coaching and general fitness guidance. It isn’t medical advice. * 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
Renu by Sam Thai3 screens

Verdict

The call

The clearest difference is update cadence: Grey Matter Training at monthly against Renu by Sam Thai's every 4 months. On price, ads, in-app purchases and device support 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. Grey Matter Training sells 1 in-app purchase, starting at $399.99 per month and Renu by Sam Thai sells 1 in-app purchase, starting at $200.00 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Grey Matter Training ships an update monthly, Renu by Sam Thai every 4 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

Scorecard1 real difference · 8 level
Grey Matter Training versus Renu by Sam Thai: the parameters behind the verdict, then further details
ParameterGrey Matter TrainingRenu by Sam Thai
PriceFreeFree
Rating5.0 (3 ratings) — better—
Number of ratings3 — better—
Update frequencyMonthly — betterEvery 4 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size47 MB56 MB
Age rating17+17+
DeveloperMichael WhiteSam Hughes

In-app purchases

1 purchases

Grey Matter Training

Subscriptions1
  • Monthly Coaching$399.991 Month
1 purchases

Renu by Sam Thai

Subscriptions1
  • Coaching$200.001 Month

Questions

Is Grey Matter Training free?
Grey Matter Training is free to download, with in-app purchases available.
Is Renu by Sam Thai free?
Renu by Sam Thai is free to download, with in-app purchases available.
Do Grey Matter Training or Renu by Sam Thai have ads?
Neither Grey Matter Training nor Renu by Sam Thai shows ads.
Which is updated more often, Grey Matter Training or Renu by Sam Thai?
Grey Matter Training ships an update monthly, and Renu by Sam Thai every 4 months. Most recently, Grey Matter Training was updated on November 3, 2026 and Renu by Sam Thai on October 30, 2026.

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