# TrainZilla for Clients vs PeptideOS+

The clearest difference is in-app purchases: TrainZilla for Clients at none against PeptideOS+'s 2. TrainZilla for Clients also leads on device support (3 vs 1) and iOS requirement (15.1 vs 17.0). PeptideOS+'s advantage is update cadence (every 4 days vs monthly). On price and ads there is nothing between them.

Both are free to download. PeptideOS+ sells 2 in-app purchases, starting at $9.99 per month. TrainZilla for Clients asks for nothing beyond the download.

TrainZilla for Clients ships an update monthly, PeptideOS+ every 4 days. The most recent releases landed on October 9, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | TrainZilla for Clients | PeptideOS+ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Size | 44 MB | 6 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 12+ |
| Developer | [Nitish Gulati](https://appshunter.io/developer/1861753950) | [ZACHARY CANCIANO GOLD](https://appshunter.io/developer/1875956705) |

## What reviewers say

### TrainZilla for Clients

[App page](https://appshunter.io/ios/app/trainzilla-for-clients/id6756607090)

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

**In-app purchases:** none


### PeptideOS+

[App page](https://appshunter.io/ios/app/peptideos-plus/id6762200959)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $9.99 | per month |
| Pro Yearly | $69.99 | per year |


## Frequently asked questions

### Is TrainZilla for Clients free?

TrainZilla for Clients is free to download, with no in-app purchases.

### Is PeptideOS+ free?

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

### Do TrainZilla for Clients or PeptideOS+ have ads?

Neither TrainZilla for Clients nor PeptideOS+ shows ads.

### Which is updated more often, TrainZilla for Clients or PeptideOS+?

TrainZilla for Clients ships an update monthly, and PeptideOS+ every 4 days. Most recently, TrainZilla for Clients was updated on October 9, 2026 and PeptideOS+ on October 6, 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.*