Kahunas vs Flex Foundry
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Kahunas
This app connects clients with their online coaches. Coaches can manage clients, update plans, and communicate directly. Clients can log workouts, track nutrition, and message their coach.
- Client management
- Workout and diet plan updates
- Check-in tracking
- Direct messaging
- Workout logging
- Nutrition plan viewing
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Online Coaches - Manage your clients on the go. - Update workout or diet plans. - View check-ins. - Message your clients. Clients - Check-in in the app. - Message your coach. - Log your workouts. - View your nutrition & supplement plans. Terms of use: https://kahunas.io/terms-conditions Privacy policy: https://kahunas.io/privacy
Flex Foundry
This app offers personalized meal plans and workout routines designed to help you achieve your fitness goals. It provides weekly check-ins and expert guidance for a results-driven approach to health and wellness.
- Custom meal plans
- Tailored workout routines
- Weekly check-ins
- Personalized feedback
- Expert guidance
- Accountability support
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Welcome to Flex Foundry! Forge Your Physique! Flex Foundry is more than just a fitness app - it's your personalized gateway to a stronger, healthier you! With our innovative platform, you'll embark on a transformative journey tailored specifically to your goals and lifestyle. Key Features: Custom Meal Plans: Say goodbye to cookie-cutter diets, and say hello to individualized plans suited to meet your needs and help reach your goals! Tailored Workout Routines: Whether you're a gym newbie or a seasoned athlete, you are guaranteed personalized workout plans to challenge and inspire you to make fitness a priority in your life. Weekly Check-Ins: Stay on track and motivated with weekly check-ins and personalized feedback. Accountability: We believe in the power of accountability. That's why we're here to support you every step of the way, ensuring you stay focused on your goals. Why Flex Foundry? Personalized Approach: No two fitness journeys are alike. That's why we customize every aspect of your experience, from meal plans to workout routines, to fit your unique needs. Expert Guidance: Our team of experienced coaches is here to provide you with the support and guidance you need to succeed. Results-Driven: Whether your goal is to lose weight, build muscle, or improve your overall health, Flex Foundry is your partner in achieving real, sustainable results. Ready to take your fitness to the next level? Download Flex Foundry today and start forging the body of your dreams! * App access requires paid coaching plan Terms of use: https://kahunas.io/terms-conditions Privacy policy: https://kahunas.io/privacy
Screenshots
Verdict
The clearest difference is rating: Flex Foundry at 5.0 against Kahunas's 3.3. Kahunas's advantage is ratings volume (73 vs 2) and monetization model (free with in-app purchases vs paid). On price, update cadence, ads and in-app purchases 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
Both are free to download. Kahunas sells 1 in-app purchase, starting at $95.99 per month and Flex Foundry sells 1 in-app purchase, starting at $200.00 per month. Whichever you choose, the download price is not the number that matters.
Flex Foundry holds the better App Store score, 5.0 against 3.3. That said, the two scores are not equally well evidenced: Kahunas has 73 ratings behind it against 2, so its average is the more settled of the two.
Kahunas ships an update monthly, Flex Foundry every 2 months. The most recent releases landed on September 22, 2026 and June 12, 2026 respectively.
| Parameter | Kahunas | Flex Foundry |
|---|---|---|
| Price | Free | Free |
| Rating | 3.3 (73 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 18.3% of reviews | — |
| Number of ratings | 73 — better | 2 |
| Update frequency | Monthly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 51 MB | 52 MB |
| Age rating | 17+ | 17+ |
| Developer | Mark Covey-Fox | John Raulston |
Customer experience
Kahunas
Flex Foundry
Bugs and requests
Kahunas
Reported bugs
26 issues- App crashes when locking phone
- Crashes during workout logging
- Login screen freezes
- Barcode scanner launches blank screen
- Rest timer displays incorrect duration
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- Workout data disappears after app exit
- Nutrition data calculations incorrect (off by 150-200 calories)
- Food entries randomly removed from diary
- App logs out randomly
- Check-in data erases when re-entering
- Keyboard jumps page when filling workout data
- Workout ordering forces wrong selection
- Unable to view exercises correctly
- Infinite loading on customer programs
- Password not remembered/cannot be changed
- App-breaking bugs with slow support response
- Payment info failure locks account
- Blue circle of death (complete data loss)
- Workout session disappears if client misses scheduled time
- Notifications constantly pop up
- Unable to create account/sign up issues
- App freezes when viewing longer text in workouts
- Inconsistent date display for workouts and check-ins
- Unable to select workouts after update
- Cannot edit daily check-ins
- Syncing issues between devices
Requested features
18 requests- Apple Watch integration and complications
- MyFitnessPal integration
- Save/reuse meal feature
- Auto-save functionality for workouts
- Weight tracking widget
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- Cardio and step tracking from Apple Health
- Better notification settings/customization
- Drop set logging within sets
- Exercise order switching capability
- Meal filter options
- Weekly macro averages calculation
- Persistent chat history (not auto-delete)
- Reply functionality for check-ins
- Dark mode option
- Better dashboard home screen
- PDF viewing in-app
- Multi-device login capability
- Offline mode
Flex Foundry
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Kahunas
- Monthly subscription$95.991 Month
Flex Foundry
- Monthly Coaching$200.001 Month
Questions
Is Kahunas free?
Is Flex Foundry free?
Which has better reviews, Kahunas or Flex Foundry?
Do Kahunas or Flex Foundry have ads?
Which is updated more often, Kahunas or Flex Foundry?
Other comparisons
