# FitBODY with Kat vs LockFast

The clearest difference is ads: LockFast at none against FitBODY with Kat's shown. LockFast also leads on update cadence (every 5 days vs every 6 weeks). FitBODY with Kat's advantage is iOS requirement (15.1 vs 26.2). On price, in-app purchases and device support there is nothing between them.

Both are free to download. FitBODY with Kat sells 4 in-app purchases, starting at $14.99 per month and LockFast sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

FitBODY with Kat ships an update every 6 weeks, LockFast every 5 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | FitBODY with Kat | LockFast |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fitbody-with-kat/id1521240455/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 92 MB | 1 MB |
| Requires iOS | **15.1** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Katherine MacKinnon](https://appshunter.io/developer/1554586247) | [Dirk Wood](https://appshunter.io/developer/1889641577) |

## What reviewers say

### FitBODY with Kat

[App page](https://appshunter.io/ios/app/fitbody-with-kat/id1521240455)

Achieve your health and fitness goals with guided workouts and a healthy eating guide. Offers a variety of workout styles, challenges, and progress tracking. Connect with a supportive community and a fitness professional with over 35 years of experience.

**Highlights:** Variety of workout options (weights/no weights), Targeted workout programs, Healthy eating guide and tips, Progress tracking, Community support group, Challenges and motivation

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $14.99 | per month |
| Quarterly | $39.99 | per 3 months |
| Annual | $129.99 | per year |
| Lifetime Access | $199.99 | one-time |


### LockFast

[App page](https://appshunter.io/ios/app/lockfast/id6761440367)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $3.99 | per 7 days |
| Annual | $49.99 | per year |
| LifeTime | $149.99 | one-time |


## Frequently asked questions

### Is FitBODY with Kat free?

FitBODY with Kat is free to download, with in-app purchases available.

### Is LockFast free?

LockFast is free to download, with in-app purchases available.

### Do FitBODY with Kat or LockFast have ads?

FitBODY with Kat shows ads; LockFast does not.

### Which is updated more often, FitBODY with Kat or LockFast?

FitBODY with Kat ships an update every 6 weeks, and LockFast every 5 days. Most recently, FitBODY with Kat was updated on November 3, 2026 and LockFast on November 5, 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.*