Comparison

STL Simple Viewer vs OctoApp for OctoPrint/Klipper

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

STL Simple Viewer is a great app to quickly view STL, 3MF & DXF 3D files and export them to the most commonly used CAD formats. Features: - Supports STL files both ASCII and Binary formats. - Supports 3MF & DXF files. - Load files directly from ZIP archives. - Export to DXF, OBJ, DAE, PLY, USD, STL & 3MF. - Measure distances between points within your model. - Rotate, pan, and zoom models with intuitive touch controls. - 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

About

OctoApp for OctoPrint/Klipper

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
Read full description

OctoApp is build with iOS in mind and is completely optimized for being used on a iPhone or iPad. The app supports OctoPrint and Klipper (Moonraker, Mainsail and Fluidd), Bambu Lab and Elegoo printers. The UI is structured into three workspaces: Connect, Prepare, Print. The Connect workspace helps you get your printer connected to OctoPrint and as soon as a printer is available OctoApp will move to the Prepare workspace. Here you can get ready for your next print! Heat your hotend, swap filament or level the bed. When you are ready and start your print, OctoApp shows the Print workspace where you can control and tune your print! This concepts allows for a simple and fast UI while not sacrificing on features! OctoApp already offers you: + Easy print preparation + Control your print + Full file access and management + Full terminal access + Flow rate, Feed rate and fan controls + Webcam support (also muticam support) + Dark mode + High performance + Notifications about your print and filament + Gcode Viewer + Support for multiple printers + Many power control plugins like PSU Control or IKEA Tradfri + Automatic lights + PrintTimeGenius support + Support for many of your favourite plugins, like ArcWelder or SpoolManager + Remote connection with supported plugin or manual setup, the app switches automatically + OctoEverywhere integration + Obico integration + Works with VPNs, HTTPS and Basic Auth + And much, much more! There is a new feature update roughly 4-8 weeks! Let me know what you are missing! Important notice for remote connections: The app does not provide required servers. You can either set something up yourself and provide the app with a URL reachable over the internet or use a plugin like OctoEverywhere, The Spaghetti Detective or ngrok. --- OctoApp is made for and compatible with but not officially associated with OctoPrint. OctoPrint is a registered trademark. Learn more at octoprint.org OctoApp is not associated with Obico, Bambu Lab, OctoEverywhere, Elegoo or other services integrated --- https://octoapp.eu/terms/

Screenshots

STL Simple Viewer4 screens
OctoApp for OctoPrint/Klipper4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard4 real differences · 6 level
STL Simple Viewer versus OctoApp for OctoPrint/Klipper: the parameters behind the verdict, then further details
ParameterSTL Simple ViewerOctoApp for OctoPrint/Klipper
PriceFreeFree
Rating4.3 (923 ratings)4.9 (1.3K ratings) — better
Positive reviews18.1% of reviews92.9% of reviews — better
Number of ratings9231.3K — better
Update frequencyEvery 5 monthsEvery 10 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, Apple Watch — better
Requires iOS17.0 — better17.6
Further details — not scored
Size19 MB249 MB
Age rating4+4+
DeveloperVictor BovioErhard Christian Wurthner

Customer experience

STL Simple Viewer

All ratings909 ratings
Positive80.3%
Neutral4.5%
Negative15.2%
Written reviews166 reviews
Positive18.1%
Neutral11.4%
Negative70.5%

OctoApp for OctoPrint/Klipper

All ratings1,308 ratings
Positive97.2%
Neutral2.0%
Negative0.8%
Written reviews99 reviews
Positive92.9%
Neutral3.0%
Negative4.0%

User reviews

STL Simple Viewer

From 923 App Store ratings

What we love

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

Room to improve

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

OctoApp for OctoPrint/Klipper

From 1.3K App Store ratings

What we love

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

Room to improve

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

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

OctoApp for OctoPrint/Klipper

Reported bugs

2 issues
  • Incorrect notifications for print progress
  • Compatibility issues with some printer models

Requested features

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

In-app purchases

4 purchases

STL Simple Viewer

Subscriptions2
  • Pro version (1 week plan)$0.997 Days
  • Pro version (1 month plan)3 Days trial$1.991 Month
One-time2
  • Remove Ads$2.99
  • Export Pack$3.99
6 purchases

OctoApp for OctoPrint/Klipper

Subscriptions2
  • Support for 1 month$0.991 Month
  • Support for 1 year7 Days trial$6.991 Year
One-time4
  • All features (Transfer)Free
  • All features$11.99
  • All features5 variants$12.99
Show 1 more
  • All features$17.99

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.

Other comparisons