Comparison

iFour Core vs BICEP BOSS

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

Head to head
About

iFour Core

This app offers a personalized core workout program designed by physical therapists. It adapts to your individual anatomy and fitness level, providing daily workouts under 10 minutes with video demonstrations. Access nutrition guides and trainer support as a member.

Highlights
  • Personalized core workout program
  • Physical therapy approved exercises
  • Daily workouts under 10 minutes
  • Video demonstrations of exercises
  • Nutrition guides and support
  • Fitness test for customized plans
Features
Read full description

Every individual’s anatomy is different which is why we have designed a customizable, physical therapy approved core program. The iFour Core app addresses specific areas of your core to help you develop the strongest core imaginable without injury. Each workout is under 10 minutes, is suitable for all fitness levels, and can take place in the home or at the gym. As a member of the iFour Core app, you will receive new workouts every day, nutrition guides, and support. FREE 7-day trial for new members! HOW IT WORKS: After completing the iFour Core fitness test, you will get a core strength rating. This rating is broken up based on muscle fibers worked (intrinsic, rectus, obliques & transverse). The iFour Core app customizes the exercises each day based on your fitness test performance and current level of core strength. WHAT MAKES US DIFFERENT: Life is full of surprises, plateaus, and challenges. We created this app with this in mind allowing you to recalibrate your individualized workout formula at any point you feel necessary. Unlike other programs, this is not simply just hitting “reset,” and repeating the same exercises from previous days. This is a full recalculated algorithm taking you from your new “starting point” with a proven plan of attack to help you once again improve. iFour Core Features: Workout & Fitness Planning • Functional yet challenging core rotations, ranging from 5-10 Minutes! • Includes regressions to decrease difficulty and progressions to advance the exercises as you improve. • 323 unique core exercises. • 137 additional core exercises with 6 different pieces of equipment to choose from. • Video demonstrations of all 323 core exercises. • Designed for all levels, whether you are coming out of physical therapy or an elite athlete! • Take the fitness test and as you get stronger, unlock more core exercises prescribed for you. Tracking & Fitness Motivation • Workout along with J, a seasoned trainer for celebrities, professional athletes, and others. • Track your daily progress in both your Fitness Test and Workout History. • Share your results on your favorite social media platform. • Keep up to date and learn with the latest iFour videos. Subscription Pricing & Terms iFourCore is free to download. Ongoing use requires an active subscription, available on a monthly or annual basis. New customers are eligible for a 7-day free trial. Annual subscriptions are billed the total fee from the purchase date. Monthly subscriptions are billed per month. Payment will be charged to your credit card through your iTunes account at confirmation of purchase. Subscription renews automatically unless cancelled at least 24 hours prior to the end of the subscription period. There is no increase in price when renewing. Subscriptions can be managed and auto-renewal turned off in Account Settings in iTunes after purchase. Once purchased, refunds will not be provided for any unused portion of the term. Read our full Terms and Conditions & Privacy Policy: https://www.ifourlife.com/

About

BICEP BOSS

Achieve a strong, muscular physique with daily 15-minute workouts designed for home or gym. This app offers progressive programs for bodyweight training and weightlifting, suitable for all ages and fitness levels. It also includes flexibility and mindfulness exercises to support overall well-being.

Highlights
  • 15-minute progressive workouts
  • Bodyweight training program
  • Weight training program
  • Exercise demos for form
  • Post-workout stretching routines
  • Yoga, meditation, and breathwork
Features
Read full description

If you are wanting to get a strong fit body and gain BOSS muscle, in only 15 minutes per day, BICEP BOSS is for you. The biggest problem is making TIME and each day's workout is only 15 minutes. That is my FLEX15 METHOD. You bring the 15 minutes and I'll bring the kick a** workout, all in the convenience of your own home OR the gym. My name is Kim Bergey and I am a 4X Certified Fitness Trainer and It's been my life's work, learning about and working on a body that is built for excellence in health, strength, muscle development and strong mindset. I have helped others achieve the same, increasing strength, muscle mass, endurance and flexibility all while inspiring discipline and a healthy diet. It is my deep desire and passion to help YOU live life strong. With my 25+ years of professional fitness training, I have learned to meet you right where you are, then we grow from there...no matter your age or situation. This entire App is progressively structured from building foundational strength to building BOSS muscle! Through my career, I've helped busy moms lose weight and get fit again, men re-gain muscle and strength lost due to life's stressors, kids build strength and feel confident in life, young athletes build endurance and strength to excel in their sport and elderly get stronger and more capable. I spent 13 successful years coaching mid/high school athletes in the highly competitive sport of wrestling, helping them develop mental discipline, physical strength and flexibility which produced individual success and state winning teams. As a Specialist in Performance Nutrition, I coach healthy eating for optimal performance that supports fat loss, muscle gain and strength. BICEP BOSS includes: *BOSS BODYWEIGHT PROGRAM- This plan is a bodyweight workout program you can do at home, that is challenging and progressive. Perfect for beginners building foundational strength, safely. Bonus post workout stretching routines included. *BOSS WEIGHT TRAINING PROGRAM- This progressive, weight training program, will help you gain BOSS muscle and strength. They are 12 week, 3 day split, lifting programs. Muscle activation warm-up & post workout stretching routines are included along each days workout. Free weights and a bench needed or gym access. BOSS BODYWEIGHT INCLUDES: *Exercise demos for tempo and form *15 minute progressive workouts *Post workout stretching routines BOSS WEIGHT TRAINING PROGRAM INCLUDES: *Exercise demos for tempo and form *Pre workout muscle activation warm-up *15 minute progressive weight training workouts *Post lifting stretching routines *Yoga stretch routine *Bonus therapeutic stretching BOSS FLEXIBILITY & CALM- Short yoga routines, meditation and breath work for greater mobility, balance and inner peace. Subscribe on its own or get it free with all other programs! Download today and enjoy Boss Holiday FREE. Three, 15 minute workouts to help you stay on track while traveling. Be Boss INFORMATION ABOUT THE APP AND PURCHASE OPTIONS By signing up, you will get access to subscription(s) that include features such as progress tracking, and offline sync. The download of BICEP BOSS is free of charge. No free trial offered. Should you use BICEP BOSS app to access in-app content via available subscription(s), a payment will be charged to your credit card through your App Store account . A subscription renews automatically unless canceled at least 24 hours prior to the end of the subscription period. There is no increase in price when renewing. Subscription(s) can be managed and auto-renewal turned off in Account Settings in the App Store after purchase. Read our full Terms of Service and our Privacy Policy: https://passion.io/terms-of-service https://passion.io/privacy-policy

Screenshots

iFour Core4 screens
BICEP BOSS4 screens

Verdict

The call

The clearest difference is ads: iFour Core at none against BICEP BOSS's shown. iFour Core also leads on iOS requirement (11.0 vs 26.0). On price, rating, review sentiment and ratings volume 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. iFour Core sells 2 in-app purchases, starting at $5.99 per month and BICEP BOSS sells 6 in-app purchases, starting at $21.99 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 iFour Core against 5.0 for BICEP BOSS. Both are backed by a comparable volume of ratings — 28 and 12 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

iFour Core ships an update every 2 months, BICEP BOSS monthly. Both last shipped on November 3, 2026.

Scorecard2 real differences · 8 level
iFour Core versus BICEP BOSS: the parameters behind the verdict, then further details
ParameteriFour CoreBICEP BOSS
PriceFreeFree
Rating5.0 (28 ratings)5.0 (12 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings28 — better12
Update frequencyEvery 2 monthsMonthly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad
Requires iOS11.0 — better26.0
Further details — not scored
Size39 MB91 MB
Age rating4+17+
Developerifour.life, LLCKimberly Bergey

Customer experience

iFour Core

All ratings28 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews11 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

BICEP BOSS

All ratings12 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews7 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

iFour Core

Subscriptions2
  • Monthly7 Days trial$5.991 Month
  • Annually7 Days trial$29.991 Year
6 purchases

BICEP BOSS

Subscriptions6
  • Boss Flexibility Plan$21.991 Month
  • Boss Flexibility & Calm$27.991 Month
  • BossStrength Membership$57.991 Month
Show 3 more
  • BossBodyweight$77.991 Month
  • Boss Body Membership$97.991 Month
  • Boss Weight Training$117.991 Month

Questions

Is iFour Core free?
iFour Core is free to download, with in-app purchases available.
Is BICEP BOSS free?
BICEP BOSS is free to download, with in-app purchases available.
Which has better reviews, iFour Core or BICEP BOSS?
iFour Core and BICEP BOSS are both rated 5.0 out of 5 on the App Store, from 28 and 12 ratings respectively.
Do iFour Core or BICEP BOSS have ads?
BICEP BOSS shows ads; iFour Core does not.
Which is updated more often, iFour Core or BICEP BOSS?
iFour Core ships an update every 2 months, and BICEP BOSS monthly. Most recently, iFour Core was updated on November 3, 2026 and BICEP BOSS on November 3, 2026.

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