# Schwartz vs STL Viewer

The clearest difference is in-app purchases: Schwartz at none against STL Viewer's 8. Schwartz also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. STL Viewer sells 8 in-app purchases, starting at $1.99 per month. Schwartz asks for nothing beyond the download.

Schwartz ships an update every 9 days, STL Viewer every 2 weeks. The most recent releases landed on October 30, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Schwartz | STL Viewer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 9 days** | Every 2 weeks |
| Size | 2 MB | 49 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ming Zhang](https://appshunter.io/developer/1829597017) | [Sahana A S](https://appshunter.io/developer/1800491118) |

## What reviewers say

### Schwartz

[App page](https://appshunter.io/ios/app/schwartz/id6753101843)

**In-app purchases:** none


### STL Viewer

[App page](https://appshunter.io/ios/app/stl-viewer-3d-print-and-g-code/id6813788641)

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LayerPeek Pro Monthly | $1.99 | per month |
| Pro Lifetime Limited Offer | $5.99 | one-time |
| Pro Lifetime Limited Offer | $7.99 | one-time |
| Pro Lifetime Limited Offer | $9.99 | one-time |
| Pro Lifetime Limited Offer | $11.99 | one-time |
| Pro Lifetime Limited Offer | $13.99 | one-time |
| Pro Lifetime Limited Offer | $15.99 | one-time |
| LayerPeek Pro Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is Schwartz free?

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

### Is STL Viewer free?

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

### Do Schwartz or STL Viewer have ads?

STL Viewer shows ads; Schwartz does not.

### Which is updated more often, Schwartz or STL Viewer?

Schwartz ships an update every 9 days, and STL Viewer every 2 weeks. Most recently, Schwartz was updated on October 30, 2026 and STL Viewer on November 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.*