# STL Viewer vs NEN

The clearest difference is price: NEN at Free against STL Viewer's $0.99. NEN also leads on update cadence (every 5 days vs every 4 weeks) and ratings volume (3 vs 1). On rating, review sentiment, ads and in-app purchases there is nothing between them.

NEN 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 NEN sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for STL Viewer against 5.0 for NEN. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

STL Viewer ships an update every 4 weeks, NEN every 5 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | STL Viewer | NEN |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/stl-viewer-3d-mesh/id6445801487/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/nen-focus-timer/id6768887563/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 5 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 5 MB | 6 MB |
| Requires iOS | **17.0** | 17.5 |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Felipe Marques de Barros](https://appshunter.io/developer/1459294806) | [Nijanthan Vijayakumar](https://appshunter.io/developer/1896613574) |

## 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 |


### NEN

[App page](https://appshunter.io/ios/app/nen-focus-timer/id6768887563)

This app provides a calm, Pomodoro-style focus timer designed for deep work and study sessions. It helps users maintain attention with clear progress tracking and distraction-resistant routines, offering customizable break intervals and app blocking features.

**Highlights:** Focus, short break, and long break sessions, Clear timer progress and round tracking, Focus categories for different work types, Block selected apps during focus (Pro), Apple Watch controls, Live Activities and widgets, Session history and progress insights

**Features:** Family Sharing, Apple Watch app, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NEN Lifetime Unlock | $2.39 | one-time |


## Frequently asked questions

### Is STL Viewer free?

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

### Is NEN free?

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

### Which has better reviews, STL Viewer or NEN?

STL Viewer and NEN are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.

### Do STL Viewer or NEN have ads?

Neither STL Viewer nor NEN shows ads.

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

STL Viewer ships an update every 4 weeks, and NEN every 5 days. Most recently, STL Viewer was updated on November 3, 2026 and NEN on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*