# STL Simple Viewer vs OctoApp for OctoPrint/Klipper

The clearest difference is review sentiment: OctoApp for OctoPrint/Klipper at 93% against STL Simple Viewer's 18%. OctoApp for OctoPrint/Klipper also leads on rating (4.9 vs 4.3) and ads (none vs shown). On price, ratings volume, in-app purchases and monetization model 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 OctoApp for OctoPrint/Klipper sells 6 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

OctoApp for OctoPrint/Klipper holds the better App Store score, 4.9 against 4.3. Both are backed by a comparable volume of ratings — 923 and 1.3K respectively. Written reviews point the same way: 18% of STL Simple Viewer's written reviews are positive against 93% of OctoApp for OctoPrint/Klipper's.

STL Simple Viewer ships an update every 5 months, OctoApp for OctoPrint/Klipper every 10 days. Both last shipped on November 3, 2026.

## The numbers

| Metric | STL Simple Viewer | OctoApp for OctoPrint/Klipper |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (923 ratings)](https://appshunter.io/ios/app/stl-simple-viewer/id1493598400/reviews) | **[4.9 (1.3K ratings)](https://appshunter.io/ios/app/octoapp-for-octoprintklipper/id1658133862/reviews)** |
| Number of ratings | 923 | **1.3K** |
| Positive reviews | 18.1% of reviews | **92.9% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 10 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 19 MB | 249 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Victor Bovio](https://appshunter.io/developer/327627515) | [Erhard Christian Wurthner](https://appshunter.io/developer/1658133864) |

## 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


### OctoApp for OctoPrint/Klipper

[App page](https://appshunter.io/ios/app/octoapp-for-octoprintklipper/id1658133862)

Control and monitor your 3D printer remotely with this advanced application. Prepare prints, manage files, and tune settings with a user-friendly interface optimized for mobile devices. Supports OctoPrint, Klipper, and various printer brands.

**Highlights:** Remote print monitoring and control, Easy print preparation, Full file and terminal access, Webcam and multi-cam support, Notifications for print and filament status, Gcode Viewer, Support for multiple printers and plugins

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support for 1 month | $0.99 | per month |
| Support for 1 year | $6.99 | per year |
| All features (Transfer) | Free | one-time |
| All features | $11.99 | one-time |
| All features | $12.99 | one-time |
| All features | $17.99 | one-time |

**What reviewers like**

- 🚀 Excellent remote monitoring and control
- 👍 Seamless integration with OctoPrint and plugins
- 💡 Customizable and flexible UI
- 🔒 Secure remote access with OctoEverywhere
- ⭐ Exceptional customer support

**What reviewers complain about**

- 🐛 Occasional connectivity issues
- 🔌 Unreliable remote access at times

**Reported bugs**

- Incorrect notifications for print progress
- Compatibility issues with some printer models

**Requested features**

- Add support for Klipper-based printer firmwares
- Implement iOS widgets for quick status checks
- Improve camera rotation options


## Frequently asked questions

### Is STL Simple Viewer free?

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

### Is OctoApp for OctoPrint/Klipper free?

OctoApp for OctoPrint/Klipper is free to download, with in-app purchases available.

### Which has better reviews, STL Simple Viewer or OctoApp for OctoPrint/Klipper?

OctoApp for OctoPrint/Klipper is rated higher. STL Simple Viewer averages 4.3 out of 5 from 923 ratings, while OctoApp for OctoPrint/Klipper averages 4.9 from 1.3K ratings.

### Do STL Simple Viewer or OctoApp for OctoPrint/Klipper have ads?

STL Simple Viewer shows ads; OctoApp for OctoPrint/Klipper does not.

### Which is updated more often, STL Simple Viewer or OctoApp for OctoPrint/Klipper?

STL Simple Viewer ships an update every 5 months, and OctoApp for OctoPrint/Klipper every 10 days. Most recently, STL Simple Viewer was updated on November 3, 2026 and OctoApp for OctoPrint/Klipper on November 3, 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.*