# Book Thickness Calculator vs Kajabi

The clearest difference is price: Kajabi at Free against Book Thickness Calculator's $0.99. Kajabi also leads on update cadence (fortnightly vs every 37 months). Book Thickness Calculator's advantage is iOS requirement (8.1 vs 16.6). On ads, in-app purchases and device support there is nothing between them.

Kajabi is free to download; Book Thickness Calculator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Book Thickness Calculator ships an update every 37 months, Kajabi fortnightly. The most recent releases landed on May 16, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Book Thickness Calculator | Kajabi |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[4.3 (7.4K ratings)](https://appshunter.io/ios/app/kajabi/id1485646310/reviews)** |
| Number of ratings | — | **7.4K** |
| Positive reviews | — | 20.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 37 months | **Fortnightly** |
| Monetization | — | Free |
| Size | 2 MB | 49 MB |
| Requires iOS | **8.1** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Manfred Breede](https://appshunter.io/developer/414696754) | [Kajabi, LLC](https://appshunter.io/developer/1164275495) |

## What reviewers say

### Book Thickness Calculator

[App page](https://appshunter.io/ios/app/book-thickness-calculator/id459990015)

**Features:** macOS Compatibility

**In-app purchases:** none


### Kajabi

[App page](https://appshunter.io/ios/app/kajabi/id1485646310)

Access your Kajabi courses and digital content from anywhere. Stream videos, listen to audio, and track your progress across all your enrolled courses. Stay updated with product news and engage with your Kajabi community.

**Highlights:** On-the-go course access, Watch and listen to digital media, Saves progress automatically, Unified course login, Cross-course content search, Product update notifications, Community exploration

**In-app purchases:** none

**What reviewers like**

- 🚀 Convenient access to courses
- 👍 Intuitive and easy to use
- 🔒 Secure login process
- 🚀 Helpful for organizing course content
- 👍 Great app for mobile learning

**What reviewers complain about**

- 🐛 Buggy and glitchy performance
- 🔋 High battery consumption
- 👎 Lacks iPad optimization
- 👎 Difficulty managing multiple accounts
- 👎 Inconsistent video playback controls

**Reported bugs**

- Videos randomly stop playing or go black
- App crashes when switching between courses
- Issues with audio/video sync
- Inconsistent behavior when rotating device
- Trouble accessing content from new course purchases

**Requested features**

- Ability to save video progress and resume later
- Option to download videos for offline viewing
- Improved search and navigation functionality
- Support for picture-in-picture and background audio playback
- Dark mode option for better visibility


## Frequently asked questions

### Is Book Thickness Calculator free?

Book Thickness Calculator costs $0.99, with no in-app purchases.

### Is Kajabi free?

Kajabi is free to download, with no in-app purchases.

### Do Book Thickness Calculator or Kajabi have ads?

Neither Book Thickness Calculator nor Kajabi shows ads.

### Which is updated more often, Book Thickness Calculator or Kajabi?

Book Thickness Calculator ships an update every 37 months, and Kajabi fortnightly. Most recently, Book Thickness Calculator was updated on May 16, 2026 and Kajabi on October 16, 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.*