# BigFiveGym vs ZenDepth

The clearest difference is in-app purchases: BigFiveGym at none against ZenDepth's 3. BigFiveGym also leads on iOS requirement (14.0 vs 18.0). ZenDepth's advantage is ads (none vs shown) and update cadence (daily vs monthly). On price and device support there is nothing between them.

Both are free to download. ZenDepth sells 3 in-app purchases, starting at $3.99 per month. BigFiveGym asks for nothing beyond the download.

BigFiveGym ships an update monthly, ZenDepth daily. The most recent releases landed on September 29, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | BigFiveGym | ZenDepth |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/zendepth/id6759767091/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Daily** |
| Monetization | — | Freemium |
| Size | 118 MB | 10 MB |
| Requires iOS | **14.0** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [NIKOLAOU - TSOVGKAN O.E](https://appshunter.io/developer/1783560611) | [Christos Voutsaras](https://appshunter.io/developer/1880557269) |

## What reviewers say

### BigFiveGym

[App page](https://appshunter.io/ios/app/bigfivegym/id6739066396)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### ZenDepth

[App page](https://appshunter.io/ios/app/zendepth/id6759767091)

Enhance your breath-holding capabilities with personalized training plans and guided exercises. Track progress, unlock techniques, and compete with friends in a visually immersive underwater environment.

**Highlights:** Adaptive training plans (CO2 & O2 tables), Guided stretching exercises, 20+ breath-hold techniques, Gamified milestones and badges, Social leaderboards for friends, Immersive underwater aesthetic

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $3.99 | per month |
| Annually | $19.99 | per year |
| Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is BigFiveGym free?

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

### Is ZenDepth free?

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

### Do BigFiveGym or ZenDepth have ads?

BigFiveGym shows ads; ZenDepth does not.

### Which is updated more often, BigFiveGym or ZenDepth?

BigFiveGym ships an update monthly, and ZenDepth daily. Most recently, BigFiveGym was updated on September 29, 2026 and ZenDepth on October 7, 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.*