# Caliber vs Built With Science+

The clearest difference is monetization model: Caliber at free with in-app purchases against Built With Science+'s subscription. On price, rating, review sentiment and ratings volume there is nothing between them.

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.

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 — 6.1K and 4.8K respectively. Written reviews are what separate them: 78% of Caliber's written reviews are positive against 80% of Built With Science+'s.

Both ship on a similar rhythm, roughly fortnightly. Both last shipped on October 25, 2026.

## The numbers

| Metric | Caliber | Built With Science+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (6.1K ratings)](https://appshunter.io/ios/app/caliber-strength-training/id1482405410/reviews)** | [4.8 (4.8K ratings)](https://appshunter.io/ios/app/built-with-science-plus/id6446000532/reviews) |
| Number of ratings | **6.1K** | 4.8K |
| Positive reviews | 78.0% of reviews | **79.5% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 67 MB | 235 MB |
| Requires iOS | **15.1** | 16.2 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 12+ | 4+ |
| Developer | [Caliber Fitness, Inc](https://appshunter.io/developer/1482405409) | [Built With Science Holdings Corp](https://appshunter.io/developer/1559732895) |

## What reviewers say

### Caliber

[App page](https://appshunter.io/ios/app/caliber-strength-training/id1482405410)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (18)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Caliber Supporter (Monthly) | $3.00 | per month |
| Caliber Supporter (Monthly) | $5.00 | per month |
| Caliber Plus (Monthly) | $6.00 | per month |
| Caliber Plus (Monthly) | $6.00 | per month |
| Caliber Supporter (Monthly) | $7.00 | per month |
| Caliber Supporter (Monthly) | $9.00 | per month |
| Caliber Plus (Monthly) | $9.00 | per month |
| Caliber Plus (Monthly) | $12.00 | per month |
| Caliber Pro (Monthly) | $19.00 | per month |
| Caliber Pro (Monthly) | $19.00 | per month |
| Caliber Plus (Yearly) | $36.00 | per year |
| Caliber Pro (3 Months) | $49.00 | per 3 months |
| Caliber Pro (3 Months) | $49.00 | per 3 months |
| Caliber Plus (Yearly) | $54.00 | per year |
| Caliber Plus (Yearly) | $72.00 | per year |
| Caliber Plus (Yearly) | $72.00 | per year |
| Caliber Pro (Yearly) | $169.00 | per year |
| Caliber Pro (Yearly) | $169.00 | per year |

**What reviewers like**

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

**What reviewers complain about**

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

**Reported bugs**

- 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**

- 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+

[App page](https://appshunter.io/ios/app/built-with-science-plus/id6446000532)

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:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Membership | $29.99 | per month |
| Annual Membership | $189.00 | per year |
| Intermediate Program Unlock | $49.00 | one-time |
| Beginner Program Unlock | $49.00 | one-time |

**What reviewers like**

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

**What reviewers complain about**

- 🐛 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

**Reported bugs**

- 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**

- 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


## Frequently asked 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 is rated higher. Caliber averages 4.8 out of 5 from 6.1K ratings, while Built With Science+ averages 4.8 from 4.8K ratings.

### 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+ fortnightly. Most recently, Caliber was updated on October 25, 2026 and Built With Science+ on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*