Comparison

Caliber vs Built With Science+

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

Head to head
About

Caliber

This app offers science-based strength training, including workout planning, tracking, and exercise tutorials. It supports individual training, group workouts, and offers optional upgrades for personalized plans, advanced features, and one-on-one coaching.

Highlights
  • Unlimited workout creation and tracking
  • 600+ exercise tutorials with videos
  • Workout groups for training with friends
  • Coach-designed training plans
  • Personalized progress tracking
  • 1-on-1 elite coaching options
Features
Read full description

Caliber is a science-based strength training app that combines resistance training, cardio, nutrition, and habit formation to help you build muscle, lose weight, and improve your overall fitness - for good. TRAIN YOUR WAY • Free Version. Create and track unlimited workouts, access 800+ exercises, and train solo or with friends. • Caliber Plus. Maximize your results with coach-designed training plans, personalized progress tracking, nutrition targets and more. • Premium Coaching. Get 1-on-1 guidance from an elite-level personal trainer with a fully customized training and nutrition plan, in-app chat + video messaging with your coach and weekly progress reviews to keep you on track. CALIBER FEATURES (FREE VERSION) • Personalized Workouts. Create and track an unlimited number of workouts tailored to your goals. No gym required. • Detailed Exercise Tutorials. Learn proper form with step-by-step videos and pro tips from Caliber coaches. • Workout Circles. Train with friends and family in private workout chats. When you hit a personal best, it's shared with the group. • Apple Health Integration. Sync your cardio, nutrition, steps and body stats from your wearable or connected device. • Connect to AI. Sync your training data with ChatGPT and Claude for personalized insights and training analysis. UNLOCK MORE WITH CALIBER PLUS (OPTIONAL UPGRADE) • Coach-Designed Training Plans. Choose from 120+ structured plans tailored to your goals, experience level and schedule. • Strength Score. Measure how strong you are relative to your potential for your age and gender. • Strength Balance. Improve your posture and mobility by optimizing your training across key muscle groups. • Caliber Lessons. Gain expert insights on training and nutrition to accelerate your progress. • Advanced Training Features. Get personalized nutrition targets, create custom exercises and supersets, swap exercises, upload progress photos, and more. PREMIUM COACHING (OPTIONAL UPGRADE) • Work with an Elite-Level Coach. Train 1-on-1 with a dedicated coach to achieve your full potential in the gym and beyond. Caliber coaches are highly vetted, accredited personal trainers among the top 1% in their field. • Fully Personalized Plan. Your coach will design a training and nutrition program just for you based on your goals, experience and lifestyle. • Daily Motivation & Expert Guidance. Stay on track with in-app messaging, video form reviews, and individualized guidance. • Weekly Progress Reviews. Get in-depth analysis from your coach to optimize your training. • Fast Response Times. Your coach is available 24/7, typically replying within a few hours. • Guaranteed Results. On average, Caliber members improve their body composition by 20% or more within 12 weeks. If you don't see results, we'll refund the cost of the program. SEE WHAT OUR MEMBERS SAY • For detailed reviews from real Caliber members, visit our TrustPilot page at https://www.trustpilot.com/review/caliberstrong.com Terms of Use: https://caliberstrong.com/terms-of-service/ Privacy Policy: https://caliberstrong.com/privacy-policy/

About

Built With Science+

This intelligent fitness companion offers personalized workout plans and nutrition advice based on scientific insights. It adapts to your progress with real-time feedback, providing guidance for continuous gains and informed health decisions.

Highlights
  • Hyper-Personalized Workouts
  • Progressive Overload Guidance
  • Real-Time Diet Adjustments
  • AI-Powered Meal Scanner
  • 250+ Exercise Tutorials
  • Daily Knowledge Boosters
  • AI Fitness & Nutrition Assistant
Features
Read full description

Reach your goals faster with BWS+ all-in-one fitness coach. Frustrated with cookie-cutter workout plans and confusing nutrition advice? BWS+ is your intelligent coach and complete fitness companion for achieving the body you've always wanted. The app integrates insights from leading fitness scientists, coaches, and dietitians, offering personalized advice based on your unique body and goals. It evolves with you, adapting your workouts and nutrition based on real-time feedback, encapsulating decades of experience into a dynamic coach that tailors itself to your needs. The latest science, personalized to you - Hyper-Personalized Workouts: Built with Science's advanced algorithm creates a workout plan specifically for your body, goals, and schedule. Whether you're hitting the gym or training at home, we've got you covered. - Progressive Overload Guidance: Never plateau again. BWS+ tells you exactly how to adjust your weights and reps each session for continuous gains. - Real-Time Diet Adjustments: As your body changes, so do your nutritional needs. Our app adapts your meal plan weekly, ensuring you're always on track. All-in-One Fitness and Nutrition Solution - 250+ In-Depth Exercise Tutorials: Master proper form with our detailed video guides, packed with science-based insights. - AI-Powered Meal Scanner: Say goodbye to tedious calorie counting. Simply snap a photo of your meal, and our AI does the rest, accurately tracking your nutrition in seconds. - Daily Knowledge Boosters: Unlock 200+ bite-sized lessons to build your fitness IQ and make informed decisions about your health. One App is All You Need - AI Fitness & Nutrition Assistant: Get personalized answers to your fitness and nutrition questions, as if you're talking directly to Jeremy Ethier. - Muscle Group Prioritizer: Focus on specific muscles that need extra attention for balanced development. - Recomp Detector: Track simultaneous fat loss and muscle gain with our advanced body composition analysis. - Step Tracking and Daily Activity Goals: Seamlessly integrate with Apple Health and Google Fit to optimize your overall activity levels. We've combined cutting-edge technology with years of scientific research to create an app that delivers real, lasting transformations. No more guesswork, no more wasted time in the gym. BWS+ provides the structure and guidance you need to finally achieve the body you deserve. Download now and take the first step towards the best version of yourself! This app requires an active BuiltWithScience+ membership or an in-app subscription purchased through the App Store to access its features and content. Subscription details and terms are available within the app.

Screenshots

Caliber4 screens
Built With Science+4 screens

Verdict

The call

The clearest difference is monetization model: Caliber at free with in-app purchases against Built With Science+'s subscription. Caliber also leads on chart position (#198 vs unranked). 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. Caliber sells 18 in-app purchases, starting at $3.00 per month and Built With Science+ sells 4 in-app purchases, starting at $29.99 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 — 4.8 for Caliber against 4.8 for Built With Science+. Both are backed by a comparable volume of ratings — 5.9K and 3.9K respectively. Written reviews are what separate them: 78% of Caliber's written reviews are positive against 80% of Built With Science+'s.

UpkeepUpdate frequency

Caliber ships an update fortnightly, Built With Science+ every 2 weeks. The most recent releases landed on September 28, 2026 and September 27, 2026 respectively.

Scorecard2 real differences · 9 level
Caliber versus Built With Science+: the parameters behind the verdict, then further details
ParameterCaliberBuilt With Science+
PriceFreeFree
Rating4.8 (5.9K ratings)4.8 (3.9K ratings)
Positive reviews78.4% of reviews79.9% of reviews — better
Number of ratings5.9K — better3.9K
Update frequencyFortnightly — betterEvery 2 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases — betterSubscription
Best chart rank#198 — better—
DevicesiPhone, iPodiPhone, iPad, Apple Watch — better
Requires iOS15.1 — better16.2
Further details — not scored
Size67 MB233 MB
Age rating12+4+
DeveloperCaliber Fitness, IncBuilt With Science Holdings Corp

Customer experience

Caliber

All ratings5,927 ratings
Positive96.6%
Neutral1.1%
Negative2.3%
Written reviews518 reviews
Positive78.4%
Neutral6.4%
Negative15.3%

Built With Science+

All ratings3,926 ratings
Positive95.6%
Neutral1.9%
Negative2.5%
Written reviews821 reviews
Positive79.9%
Neutral6.2%
Negative13.9%

User reviews

Caliber

From 5.9K App Store ratings

What we love

  • 👍 Easy to use
  • 🚀 Comprehensive workout tracking
  • 💡 Customizable workouts
  • 🔍 Detailed exercise instructions and videos
  • 📊 Strength score and progress tracking

Room to improve

  • 🐛 Occasional app crashes and bugs
  • 🔍 Limited offline functionality
  • 💰 Subscription model can be confusing
  • 🔍 Inconsistent video quality and exercise explanations
  • 🕰️ Frustrating user interface at times

Built With Science+

From 3.9K App Store ratings

What we love

  • 👍 Comprehensive fitness and nutrition tracking
  • 🚀 Convenient all-in-one app
  • 📚 Helpful educational lessons
  • 💪 Science-backed program
  • 🎯 Customized and adaptive workouts

Room to improve

  • 🐛 Occasional performance issues and bugs
  • 🔍 Limited food database and recipe options
  • 📱 Lack of integration with other fitness apps and devices
  • 🕰️ Inflexible workout scheduling
  • 💬 Limited human interaction and coaching support

Bugs and requests

Caliber

Reported bugs

3 issues
  • Workout data loss when switching between online and offline mode
  • Strength score not updating correctly in some cases
  • Inability to log weight for certain exercises

Requested features

5 requests
  • Add ability to create and save custom exercises
  • Integrate with more fitness tracking devices and apps
  • Improve offline mode to allow full workout tracking
  • Provide more flexibility in workout scheduling and planning
  • Enhance strength score calculations and explanations

Built With Science+

Reported bugs

4 issues
  • Workout data sometimes gets lost or marked incomplete
  • App takes a long time to open
  • Login and sign-up issues for existing customers
  • Inconsistent exercise recommendations and adjustments

Requested features

5 requests
  • Add ability to create and save custom recipes
  • Integrate with Apple Health and other fitness platforms
  • Provide more flexibility in workout scheduling
  • Enhance human coaching and support features
  • Improve performance and stability

In-app purchases

18 purchases

Caliber

Subscriptions18
  • Caliber Supporter (Monthly)$3.001 Month
  • Caliber Supporter (Monthly)$5.001 Month
  • Caliber Plus (Monthly)2 variants$6.001 Month
Show 15 more
  • Caliber Plus (Monthly)7 Days trial$6.001 Month
  • Caliber Supporter (Monthly)$7.001 Month
  • Caliber Supporter (Monthly)$9.001 Month
  • Caliber Plus (Monthly)2 variants$9.001 Month
  • Caliber Plus (Monthly)2 variants$12.001 Month
  • Caliber Pro (Monthly)$19.001 Month
  • Caliber Pro (Monthly)7 Days trial$19.001 Month
  • Caliber Plus (Yearly)7 Days trial$36.001 Year
  • Caliber Pro (3 Months)$49.003 Months
  • Caliber Pro (3 Months)7 Days trial$49.003 Months
  • Caliber Plus (Yearly)7 Days trial2 variants$54.001 Year
  • Caliber Plus (Yearly)7 Days trial2 variants$72.001 Year
  • Caliber Plus (Yearly)1 Month trial$72.001 Year
  • Caliber Pro (Yearly)$169.001 Year
  • Caliber Pro (Yearly)7 Days trial$169.001 Year
4 purchases

Built With Science+

Subscriptions2
  • Monthly Membership14 Days trial$29.991 Month
  • Annual Membership14 Days trial$189.001 Year
One-time2
  • Intermediate Program Unlock$49.00
  • Beginner Program Unlock$49.00

Questions

Is Caliber free?
Caliber is free to download, with in-app purchases available.
Is Built With Science+ free?
Built With Science+ is free to download, with in-app purchases available.
Which has better reviews, Caliber or Built With Science+?
Caliber and Built With Science+ are both rated 4.8 out of 5 on the App Store, from 5.9K and 3.9K ratings respectively.
Do Caliber or Built With Science+ have ads?
Neither Caliber nor Built With Science+ shows ads.
Which is updated more often, Caliber or Built With Science+?
Caliber ships an update fortnightly, and Built With Science+ every 2 weeks. Most recently, Caliber was updated on September 28, 2026 and Built With Science+ on September 27, 2026.

Other comparisons