# STL Master — STL File Viewer + AR & Sharing

> 3D model viewer with AR, sharing, and screen recording capabilities. (iPhone/iPad app by JA Logic Labs LLC.)

- Source: https://appshunter.io/ios/app/stl-master/id1435885139 (this page in markdown: same URL + `.md`)
- Developer: [JA Logic Labs LLC](https://appshunter.io/developer/1745984849)
- Category: Utilities, Graphics & Design
- Price: Free
- Rating: 4.20/5 from 49 App Store ratings · 115 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.1 · 68 MB
- Languages: American English
- Released: 2019-02-05
- Data updated: 2026-06-08
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/stl-master/id1435885139/reviews.md

## What is STL Master?

This app also allows you to share instant screenshots and screen recording videos of your designs without using any other tools/apps.

## Key features

- STL file viewing
- Augmented reality (AR) mode
- Instant screenshots
- Screen recording
- Design sharing

## What do users think of STL Master?

Overall sentiment: mixed

**Pros**

- 🚀 Fast and smooth rendering performance
- 💰 Completely free with no ads or trackers
- 🎨 High-quality rendering and visualization
- 📱 Works well on mobile devices (iPhone, iPad)
- 🌐 AR (Augmented Reality) feature
- ☁️ Cloud file browsing integration
- 🎬 Video recording capability
- 🎨 Multiple material and gemstone color options
- 📊 Measurement and dimension viewing
- 📁 Support for multiple file formats (STL, OBJ)
- 👥 Responsive developer support
- 🖼️ Customizable background options
- 💡 Multiple hidden features and capabilities

**Cons**

- 🐛 Frequent crashes and freezing
- 🖱️ Difficult object manipulation and navigation
- 🔍 Zoom limitations (hard to zoom out/in)
- ❌ Inconsistent file loading and orientation
- 🎨 Overly shiny/metallic default appearance
- 🖥️ Poor Mac compatibility and functionality
- 📍 No clear reference points for object centering
- 🔘 Confusing and unintuitive UI/button design
- 📏 Measurement display issues and reversed dimensions
- 🚫 Markup mode is broken and inescapable
- 💾 No save functionality for combined files
- 📖 Lack of documentation and tutorials
- 🎯 Missing basic Mac features (drag-and-drop, menu items)

**Commonly reported bugs**

- App crashes immediately on launch
- Files won't open or load
- Objects disappear when moved
- Inconsistent file orientation on load
- Markup mode traps user and requires app restart
- Buttons don't toggle/close properly
- Measurement dimensions display as mirror images
- HDRI background doesn't affect model lighting
- Freezing in editing/pen tip mode
- Objects zoomed in with no zoom out capability
- Parts of model cut off or not displayed
- Mac version has significant stability issues
- iOS 10.2 compatibility crash

**Most requested features**

- More color and material options
- Unit measurement display and metric/standard conversion
- How-to video tutorials for hidden features
- Proper zoom in/out controls
- Object positioning/movement button
- Measurement and dimension tools
- Drag-and-drop file opening support
- Menu items for file operations
- Closeable menu buttons
- More file format support
- HDRI lighting affecting model rendering
- Save functionality for combined files
- Proper markup mode functionality

## Recent user reviews (10 of 115)

All indexed reviews: https://appshunter.io/ios/app/stl-master/id1435885139/reviews.md

### 5/5 — Превосходно!

*2026-03-19, version 5.2*

Функционально, удобно, бесплатно! Спасибо, высший балл!

### 4/5 — Good STL Viewer

*2026-03-01, version 5.2*

I needed a way to view stl files and this does that and runs well on my phone.  It has its quirks but I use it often.  The dev could add more color options and turning the metal slider down has helped on certain models that look funny at first load.  And it’s completely free, small, and no trackers or spying!

### 1/5 — Doesn’t work

*2026-01-21, version 5.2*

Couldn’t get it to open any STLs unfortunately

### 5/5 — Спасибо за приложение!

*2025-12-12, version 5.2*

Оно и размеры показывает! Кроме того, можно подгружать другие STL-файлы! То-есть, если  модель была автором разрезана и сохранена в отдельных файлах, просмотрщик может очень просто соединить обе половинки в единое целое!
Ребята, ВЫ круты! Дальнейших Вам успехов!

### 3/5 — A little rough but works

*2025-09-27, version 1.0.5*

First time I opened a file it wasn’t oriented right and I could not see most of it. Second time, it was centered in the viewport. Seems OK, just basic surfacing options. No menu items (like for Open File). Can’t drag and drop a file into the window to open it, or onto the icon. That is BASIC Mac functionality stuff. The “cloud” icon is for open, that doesn’t make sense. View buttons on the bottom don’t close their menus, you have to click in the window to hide them. OK, easy to try options, but clicking the button again doesn’t close them. No way to zoom in/out.

### 4/5 — Simple But Effective

*2025-02-28, version 1.0.5*

I like this, but my suggestion is to give the units the measurements are in.  I assume it’s millimeters.  Also, it may be worthwhile to give the ability to change units from metric to standard.

### 5/5 — Отличный бесплатный просмоторщик STL

*2025-02-18, version 5.2*

Отличная программа! Бесплатна, без рекламы, все работает. Панели типа смена цвета и остальные убираются тапом по любому свободному месту на экране. Можно посмотреть габариты модели (ширину, высоту, глубину). Можно записать видео с экрана. Единственное — по умолчанию модель золотого глянцевого цвета, но цвет можно поменять, я ставлю серый и делаю его матовым.

### 5/5 — Great Idea

*2025-02-04, version 1.0.5*

Love the idea of this app, unfortunately it doesn’t work on Mac. Still gave it good ratings in hopes the developer considers working on the project again. If they could fix the crashes and add more colours, it would be an amazing Mac app

### 4/5 — Просьба устранить проблему

*2025-02-03, version 5.2*

При замене цвета модели, камней и все остальные открытые панели не закрываются, может их можно как то закрыть, очень мешают при записи экрана, спасибо разработчикам за такую программу :)

### 2/5 — Help

*2025-01-11, version 5.2*

I downloaded this app but when i try to use it, none of the buttons work. Wont do anything at all. Incan change color of brush but wont let me do anything with it? What am i doing wrong ?

## Frequently asked questions about STL Master

### What does STL Master do?

STL Master allows you to view and interact with 3D models in augmented reality. It also enables you to share instant screenshots and screen recording videos of your designs directly within the app.

### What are the key features of STL Master?

Key features include the ability to view STL files, utilize an augmented reality mode for immersive visualization, take instant screenshots of your models, and record your screen to capture design progress or demonstrations.

### Is STL Master free to use?

Yes, STL Master is available for free. The provided information indicates it does not have in-app purchases or advertisements.

### Who is STL Master for?

This app is designed for individuals and professionals who work with 3D models and require a convenient way to view, explore in AR, and share their designs.

## Version history (last 5 releases)

### 5.2 — 2024-08-07

Bug fixes

### 5.1.9 — 2024-06-20

bug fixes

### 5.1.8 — 2024-05-12

Account sign up
have been enabled for model sharing feature.

### 5.1.7 — 2023-09-14

bug fixes
file association of stl and obj extensions

### 5.1.6 — 2022-10-08

Try on feature added for AR
Bug fixes

## Apps similar to STL Master

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| --- | --- | --- | --- |
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## More apps by JA Logic Labs LLC

- [Jewelers' Assist](https://appshunter.io/ios/app/jewelers-assist/id1367390992)

All apps by JA Logic Labs LLC: https://appshunter.io/developer/1745984849

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-08.*