# STL Viewer vs TreeNotes

The clearest difference is price: TreeNotes at Free against STL Viewer's $0.99. TreeNotes also leads on iOS requirement (15.6 vs 17.0). STL Viewer's advantage is ads (none vs shown). On update cadence, in-app purchases and device support there is nothing between them.

TreeNotes is free to download; STL Viewer costs $0.99 up front. STL Viewer sells 5 in-app purchases, starting at $2.99 per month and TreeNotes sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

STL Viewer ships an update every 4 weeks, TreeNotes every 2 weeks. The most recent releases landed on November 7, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | STL Viewer | TreeNotes |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/stl-viewer-3d-mesh/id6445801487/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 weeks | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 5 MB | 34 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Felipe Marques de Barros](https://appshunter.io/developer/1459294806) | [Seiya.k](https://appshunter.io/developer/383021944) |

## What reviewers say

### STL Viewer

[App page](https://appshunter.io/ios/app/stl-viewer-3d-mesh/id6445801487)

View, explore, and edit 3D models on your iPhone or iPad. Basic viewing is included with purchase, with optional upgrades for advanced creation, editing, and reporting features. Models are processed locally for privacy.

**Highlights:** Open and view STL files, Rotate, pan, and zoom models, Basic model information inspection, Create and edit 3D models, Measure distances and angles, Export to multiple file formats, Generate local PDF reports

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| STL Viewer Pro Mensal | $2.99 | per month |
| STL Viewer Studio Mensal | $5.99 | per month |
| STL Viewer Pro Anual | $22.99 | per year |
| STL Viewer Studio Anual | $49.99 | per year |
| STL Viewer Pro Vitalício | $39.99 | one-time |


### TreeNotes

[App page](https://appshunter.io/ios/app/treenotes-tree-outliner/id6754949841)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $2.99 | one-time |


## Frequently asked questions

### Is STL Viewer free?

STL Viewer costs $0.99, and also offers in-app purchases.

### Is TreeNotes free?

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

### Do STL Viewer or TreeNotes have ads?

TreeNotes shows ads; STL Viewer does not.

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

STL Viewer ships an update every 4 weeks, and TreeNotes every 2 weeks. Most recently, STL Viewer was updated on November 7, 2026 and TreeNotes on October 30, 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.*