# 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 6 weeks). STL Viewer's advantage is chart position (#121 vs unranked). On review sentiment, ads, in-app purchases and monetization model 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.

STL Viewer ships an update every 6 weeks, NEN every 5 days. The most recent releases landed on October 27, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | STL Viewer | NEN |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/nen-focus-timer/id6768887563/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 5 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#121** | — |
| Size | 5 MB | 5 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-print-and-mesh/id6445801487)

**Currently charting:** #121 Top Paid · Productivity (US App Store)

Visualize e inspecione modelos 3D STL em seu dispositivo. Oferece ferramentas avançadas para medição, análise de malha e geração de relatórios PDF. Ideal para engenharia, impressão 3D e revisão técnica.

**Highlights:** Multitouch rotation, pan, and zoom, Wireframe, X-Ray, and normal orientation modes, Precise point-to-point measurement, Interactive cutting plane, Mesh health diagnostics, Generate PDF technical 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 offers a calm Pomodoro-style timer designed for deep work and study sessions. It guides users through focus periods and breaks with a simple, distraction-resistant interface. Track progress, categorize work, and utilize Apple Watch controls for enhanced productivity.

**Highlights:** Focus, short break, and long break sessions, Clear timer progress and round tracking, Focus categories for different work types, Apple Watch controls, Live Activities and widgets, Session history and progress insights

**Features:** Family Sharing, Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NEN Lifetime Unlock | $6.99 | 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.

### 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 6 weeks, and NEN every 5 days. Most recently, STL Viewer was updated on October 27, 2026 and NEN on October 17, 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.*