# STL Viewer vs Deadline Countdown

The clearest difference is price: Deadline Countdown at Free against STL Viewer's $0.99. Deadline Countdown also leads on in-app purchases (none vs 5). On update cadence, ads, device support and iOS requirement there is nothing between them.

Deadline Countdown is free to download; STL Viewer costs $0.99 up front. STL Viewer sells 5 in-app purchases, starting at $2.99 per month. Deadline Countdown asks for nothing beyond the download.

STL Viewer ships an update every 4 weeks, Deadline Countdown fortnightly. The most recent releases landed on November 3, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | STL Viewer | Deadline Countdown |
| --- | --- | --- |
| 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 | **No** |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Fortnightly** |
| Monetization | Paid | — |
| Size | 5 MB | 1 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | **iPhone, Mac, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Felipe Marques de Barros](https://appshunter.io/developer/1459294806) | [Myworkingmemory LLC](https://appshunter.io/developer/1892099684) |

## 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 |


### Deadline Countdown

[App page](https://appshunter.io/ios/app/deadline-countdown-stay-sharp/id6777861464)

**In-app purchases:** none


## Frequently asked questions

### Is STL Viewer free?

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

### Is Deadline Countdown free?

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

### Do STL Viewer or Deadline Countdown have ads?

Neither STL Viewer nor Deadline Countdown shows ads.

### Which is updated more often, STL Viewer or Deadline Countdown?

STL Viewer ships an update every 4 weeks, and Deadline Countdown fortnightly. Most recently, STL Viewer was updated on November 3, 2026 and Deadline Countdown on October 22, 2026.

---

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