# STL Simple Viewer vs EarnTime

The clearest difference is review sentiment: EarnTime at 100% against STL Simple Viewer's 18%. EarnTime also leads on rating (5.0 vs 4.3) and ads (none vs shown). STL Simple Viewer's advantage is ratings volume (918 vs 1). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. STL Simple Viewer sells 4 in-app purchases, starting at $0.99 per 7 days and EarnTime sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

EarnTime holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: STL Simple Viewer has 918 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 18% of STL Simple Viewer's written reviews are positive against 100% of EarnTime's.

STL Simple Viewer ships an update every 5 months, EarnTime every 3 days. The most recent releases landed on October 26, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | STL Simple Viewer | EarnTime |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (918 ratings)](https://appshunter.io/ios/app/stl-simple-viewer/id1493598400/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/earntime-screen-time-blocker/id6812209883/reviews)** |
| Number of ratings | **918** | 1 |
| Positive reviews | 18.1% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 3 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 19 MB | 11 MB |
| Requires iOS | **17.0** | 17.4 |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Victor Bovio](https://appshunter.io/developer/327627515) | [Hangfang Zhang](https://appshunter.io/developer/1806855835) |

## What reviewers say

### STL Simple Viewer

[App page](https://appshunter.io/ios/app/stl-simple-viewer/id1493598400)

Easily view and interact with 3D STL CAD models. Supports various file types and offers advanced rendering options for detailed analysis. Get model information and explore interiors with clipping planes.

**Highlights:** View ASCII and Binary STL files, Load STL from ZIP, Rotate, pan, and zoom, Orthogonal and Perspective modes, Model info (triangle count, bounding box), Rendering options (faces, edges, transparency), Clipping plane for interiors

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro version (1 week plan) | $0.99 | per 7 days |
| Pro version (1 month plan) | $1.99 | per month |
| Remove Ads | $2.99 | one-time |
| Export Pack | $3.99 | one-time |

**What reviewers like**

- 🚀 Simple and intuitive viewer
- 👍 Useful viewing options
- 💡 Supports multiple file formats

**What reviewers complain about**

- 🐛 Frequent crashes
- 🔋 High battery consumption
- 🚨 Excessive and intrusive ads
- 🔍 Limited functionality for larger files

**Reported bugs**

- App crashes when opening larger STL files
- Inability to open some file formats
- Ads continue to appear even after paying for ad removal

**Requested features**

- Add ability to save color/lighting settings
- Improve stability and reduce crashes
- Provide an ad-free paid version


### EarnTime

[App page](https://appshunter.io/ios/app/earntime-screen-time-blocker/id6812209883)

This app intelligently blocks distracting applications by requiring users to earn screen time through physical activity. It offers workout immunity and allows unused time to roll over, promoting a healthier balance between digital habits and physical well-being.

**Highlights:** Earn screen time through physical activity, Workout immunity for active sessions, Intelligent app shielding, Screen-off audio doesn't count against time, Rest day grace period and reserves, Apple Watch and iOS widgets, 100% on-device privacy

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EarnTime Full | $1.99 | one-time |


## Frequently asked questions

### Is STL Simple Viewer free?

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

### Is EarnTime free?

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

### Which has better reviews, STL Simple Viewer or EarnTime?

EarnTime is rated higher. STL Simple Viewer averages 4.3 out of 5 from 918 ratings, while EarnTime averages 5.0 from 1 ratings.

### Do STL Simple Viewer or EarnTime have ads?

STL Simple Viewer shows ads; EarnTime does not.

### Which is updated more often, STL Simple Viewer or EarnTime?

STL Simple Viewer ships an update every 5 months, and EarnTime every 3 days. Most recently, STL Simple Viewer was updated on October 26, 2026 and EarnTime on October 9, 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.*