STL Simple Viewer vs U
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
U
Streamline your workflow by directly inputting measurements from calipers and micrometers. This application simplifies data collection for process control, making it easier to manage your measurements.
- Direct caliper data input
- Direct micrometer data input
- Process control functionality
- Easy data collection
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Easy process control by directly taking in caliper and micrometer data.
Screenshots
Verdict
The clearest difference is rating: STL Simple Viewer at 4.3 against U's 3.0. STL Simple Viewer also leads on ratings volume (866 vs 2) and review sentiment (17% vs 0%). U's advantage is in-app purchases (none vs 4) and ads (none vs shown). On price, update cadence 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. U asks for nothing beyond the download.
STL Simple Viewer holds the better App Store score, 4.3 against 3.0. That said, the two scores are not equally well evidenced: STL Simple Viewer has 866 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 17% of STL Simple Viewer's written reviews are positive against 0% of U's.
STL Simple Viewer ships an update every 20 months, U every 11 months. The most recent releases landed on September 23, 2026 and September 10, 2026 respectively.
| Parameter | STL Simple Viewer | U |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (866 ratings) — better | 3.0 (2 ratings) |
| Positive reviews | 17.2% of reviews — better | 0.0% of reviews |
| Number of ratings | 866 — better | 2 |
| Update frequency | Every 20 months | Every 11 months — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 19 MB | 13 MB |
| Age rating | +4 | 4+ |
| Developer | Victor Bovio | MITUTOYO CORPORATION |
Customer experience
STL Simple Viewer
U
Bugs and 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
U
Not enough reviews yet to summarise bugs or requests.
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
U
No in-app purchases
Questions
Is STL Simple Viewer free?
Is U free?
Which has better reviews, STL Simple Viewer or U?
Do STL Simple Viewer or U have ads?
Which is updated more often, STL Simple Viewer or U?
Other comparisons
