B>IAM vs Built By Karl
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
B>IAM
This app offers comprehensive fitness and nutrition tracking to help you achieve your health goals. It allows you to log workouts, monitor body measurements, and track daily meals with personalized plans and targets. Access all your personal data to visualize your progress and stay motivated.
- Workout progression tracking
- Nutrition logging and meal plans
- Body measurement tracking
- Progress picture visualization
- Wearable fitness tracker synchronization
- Personalized nutrition targets
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P.T.321’s ~ B>IAM ~ APP P.T.321, has provided personal training services for face to face sessions since 2010. Despite the love of providing face to face sessions, P.T.321 must move with the times. B>IAM is just that, all the passion, experience, and love for personal training brought to the palm of your hand, offering mobility, convenience, and affordability. Transform your fitness journey with B>IAM, a comprehensive fitness and nutrition app designed to track and analyse your progress. Design for the everyday user. B>IAM provides an unparalleled range of features, that caters for your specific and individual needs. Every user has access to all their own personal information, giving you the ability to track your journey, progress, and data. Workout Tracking - Record your workouts progression, from the weights, reps, RPE, and time taken. - View stats for each exercise, comparing progression with other times completed. - Compare the progress with your volume, maximum weights per exercise and more. - Synchronise your daily steps calories burn and workouts from your wearable fitness tracker monitor. Nutrition Tracking - Log your daily meals and see the total calories, protein, carbs, and fats for that day. - Follow customised meal plans directly within your app’s food diary - Follow your personalised nutrition targets to realise your intended goals such as fat loss, weight loss, and/ or muscle gain. - Track your food, your calorie intake and macros for weight loss, maintenance and/or weight gain. Body Measurement Tracking - Keep track of your body weight, body fat percentage, waist measurements, and more. - Record and view your progress picture over time and see your intent realised. - progress pictures of before and during will help keep your intent alive and you motivated. to B>IAM!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * App access requires paid coaching plan Terms of use: https://kahunas.io/terms-conditions Privacy policy: https://kahunas.io/privacy
Built By Karl
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Built By Karl is a fitness and lifestyle coaching app designed to help busy men build strength, lose body fat, and create sustainable habits alongside work and family life. The app provides structured training programs, simple nutrition guidance, and daily accountability tools to support long-term consistency. Users can follow workouts tailored to their goals, track progress over time, and stay organised with habit tracking and check-ins. Key features include: Personalised workout plans with exercise demonstrations Progress tracking for workouts, body metrics, and habits Nutrition guidance and food tracking support In-app messaging for communication and feedback Goal setting and reminders to support consistency Built By Karl focuses on practical routines that fit around real life, helping users stay consistent without extreme diets or complicated systems. Everything is delivered in one place to make fitness simple, structured, and manageable. *App access requires a paid coaching plan. Terms Of Use: https://kahunas.io/terms-conditions Privacy Policy: https://kahunas.io/privacy Medical Disclaimer: This app does not provide medical advice, diagnoses, or treatment. The information and guidance provided within the app are for general fitness and wellbeing purposes only. Always seek the advice of your physician or other qualified healthcare provider before starting any exercise program, changing your nutrition, or making decisions regarding your health.
Screenshots
Verdict
The clearest difference is update cadence: B>IAM at every 5 weeks against Built By Karl's every 3 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
Both are free to download. B>IAM sells 1 in-app purchase, starting at $29.99 per month and Built By Karl sells 1 in-app purchase, starting at $299.99 per month. Whichever you choose, the download price is not the number that matters.
B>IAM ships an update every 5 weeks, Built By Karl every 3 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.
| Parameter | B>IAM | Built By Karl |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Every 5 weeks — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 51 MB | 56 MB |
| Age rating | 17+ | 17+ |
| Developer | P.T.321 Ltd | Karl Jardine |
In-app purchases
B>IAM
- Monthly Program$29.991 Month
Built By Karl
- Monthly 1-1$299.991 Month









