ENGEL e vs STL Simple Viewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ENGEL e
This tool simplifies complex calculations for injection molders, including stroke volume, clamping force, cooling time, and screw speed. Get accurate results quickly and clearly displayed on a single page, eliminating the need for tedious manual computations.
- Calculate stroke volume
- Determine clamping force
- Estimate cooling time
- Calculate screw speed
- Clear, structured results display
- Quick calculations
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The ENGEL | e-calc app is a comprehensive tool for every injection moulder. With this tool you can very easily calculate stroke volume, clamping force, cooling time and the screw speed. Instead of making tedious calculations you 'll quickly receive the desired results within just a few clicks. These are displayed clearly structured on one page.
STL Simple Viewer
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.
- 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
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STL Simple Viewer is a great app to quickly view 3D STL & 3MF files and export them to the most commonly used CAD formats. Features: - Supports STL files both ASCII and Binary formats. - Supports 3MF files. - Load STL and 3MF files directly from ZIP archives. - Export to DXF, OBJ, DAE, PLY and USD. - Rotate, pan, and zoom models with intuitive touch controls. - Measure distances between points within your model. - Configure rendering options: faces, edges, points, background and transparency. - Render using a clipping plane (useful for viewing model interiors). - View models in Orthographic or Perspective mode. - Obtain model information including triangle count, bounding box, surface area, and volume. Privacy Policy: https://www.boviosoft.com/apps/privacy.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ For support or questions: support@boviosoft.com
Screenshots
Verdict
The clearest difference is in-app purchases: ENGEL e at none against STL Simple Viewer's 4. ENGEL e also leads on ads (none vs shown) and update cadence (every 4 months vs every 20 months). On price, review sentiment and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. STL Simple Viewer sells 4 in-app purchases, starting at $0.99 per 7 days. ENGEL e asks for nothing beyond the download.
ENGEL e ships an update every 4 months, STL Simple Viewer every 20 months. The most recent releases landed on July 3, 2026 and September 23, 2026 respectively.
| Parameter | ENGEL e | STL Simple Viewer |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.3 (866 ratings) — better |
| Positive reviews | 25.0% of reviews — better | 17.2% of reviews |
| Number of ratings | — | 866 — better |
| Update frequency | Every 4 months — better | Every 20 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 29 MB | 19 MB |
| Age rating | 4+ | +4 |
| Developer | ENGEL AUSTRIA GmbH | Victor Bovio |
Customer experience
ENGEL e
STL Simple Viewer
Bugs and requests
ENGEL e
Not enough reviews yet to summarise bugs or requests.
STL Simple Viewer
Reported bugs
3 issues- 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
3 requests- Add ability to save color/lighting settings
- Improve stability and reduce crashes
- Provide an ad-free paid version
In-app purchases
ENGEL e
No in-app purchases
STL Simple Viewer
- Pro version (1 week plan)$0.997 Days
- Pro version (1 month plan)3 Days trial$1.991 Month
- Remove Ads$2.99
- Export to OBJ, DAE, DXF, PLY$3.99
Questions
Is ENGEL e free?
Is STL Simple Viewer free?
Do ENGEL e or STL Simple Viewer have ads?
Which is updated more often, ENGEL e or STL Simple Viewer?
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