# marble.fit vs Zone Training Log

The clearest difference is in-app purchases: marble.fit at none against Zone Training Log's 3. Zone Training Log's advantage is update cadence (every 4 days vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Zone Training Log sells 3 in-app purchases, starting at $1.99 per month. marble.fit asks for nothing beyond the download.

marble.fit ships an update every 2 weeks, Zone Training Log every 4 days. The most recent releases landed on September 4, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | marble.fit | Zone Training Log |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Size | 9 MB | 20 MB |
| Requires iOS | 26.0 | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lorenzo Quaid Sison](https://appshunter.io/developer/1821002361) | [Code Marketer s.r.o.](https://appshunter.io/developer/1207678989) |

## What reviewers say

### marble.fit

[App page](https://appshunter.io/ios/app/marblefit/id6757725234)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Zone Training Log

[App page](https://appshunter.io/ios/app/zone-training-log/id6757948716)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium Subscription | $1.99 | per month |
| Yearly Premium Subscription | $14.99 | per year |
| Lifetime Access | $49.99 | one-time |


## Frequently asked questions

### Is marble.fit free?

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

### Is Zone Training Log free?

Zone Training Log is free to download, with in-app purchases available.

### Do marble.fit or Zone Training Log have ads?

Neither marble.fit nor Zone Training Log shows ads.

### Which is updated more often, marble.fit or Zone Training Log?

marble.fit ships an update every 2 weeks, and Zone Training Log every 4 days. Most recently, marble.fit was updated on September 4, 2026 and Zone Training Log on September 18, 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.*