Comparison

STL File Viewer Pro vs HTML Viewer

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

Head to head
About

STL File Viewer Pro

Easily view, rotate, and inspect 3D STL files on your iPhone or iPad. Load models instantly from various sources for 3D printing, design review, or engineering inspection.

Highlights
  • Instant STL file loading
  • Full 360° rotation and zoom
  • Sharp detail rendering
  • Light and dark mode support
  • Lightweight and fast performance
  • Open files from Files, email, AirDrop
Features
Read full description

View, Rotate & Inspect Your 3D STL Files with Ease! Open any STL file in seconds — no sign-up, no clutter, just your 3D model ready to explore. STL File Viewer lets you load, rotate, zoom, and inspect 3D STL files directly on your iPhone or iPad. Built for speed, it handles everything from small parts to complex models smoothly. Whether you're reviewing jewelry CAD files before production, checking 3D print files for errors, or inspecting engineering designs on the go — this is the fastest way to view STL files on iOS. WHAT YOU GET: Instant file loading — open STL files from Files, email, AirDrop, or any app Full 360° control — rotate, zoom, and pan with intuitive touch gestures Measure STL file distance between 2 points Estimate STL File Weight in different materials Sharp detail rendering Light & dark mode — comfortable viewing anywhere Lightweight & fast — no bloat, no lag BUILT FOR: - 3D printing enthusiasts previewing files before printing - Jewelry designers reviewing CAD models - Engineers and architects inspecting parts on the go - Students and hobbyists exploring 3D models No account required. Just open and view using our simple STL Viewer App. Download now and see your CAD files the way they're meant to be seen. Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

HTML Viewer

Inspect and analyze the HTML source code of any website or local files. Features include element inspection, syntax highlighting, and multi-tab support for efficient workflow. Ideal for developers and students learning web technologies.

Highlights
  • View website source code
  • Inspect elements
  • Open local/iCloud HTML files
  • Multiple tabs support
  • Syntax highlighting
  • Search and copy code
Features
Read full description

Inspect Website Source Code, Syntax Highlighting & More – Ad-Free with "HTML Viewer: View Source". "HTML Viewer: View Source" is the perfect tool for developers, students, and curious minds who want to view, inspect, and analyze HTML code on the go — with no ads, ever. Key Features: ► View Source Code Instantly: Load and inspect the HTML source of any website. ► Inspect Elements: Tap into any part of the page to reveal the underlying HTML – just like browser dev tools. ► Open Local or iCloud HTML Files: Easily access saved HTML files from your device or iCloud Drive. ► Multiple Tabs Support: Work on multiple files or websites at once – perfect for multitaskers. ► Syntax Highlighting: Enjoy beautifully formatted code that’s easy to read and navigate. ► Search & Copy Code: Find what you need in a flash and copy snippets effortlessly. Whether you're debugging, learning HTML, or just curious how a webpage works, HTML Viewer: View Source delivers a smooth, professional experience — all ad-free. I love feedback! Get in touch with me at support@umango.in. Check out our privacy policy at https://sites.google.com/view/html-inspector/privacy-policy and our terms of use at https://www.apple.com/legal/internet-services/itunes/dev/stdeula

Screenshots

STL File Viewer Pro3 screens
HTML Viewer4 screens

Verdict

The call

The clearest difference is ads: HTML Viewer at none against STL File Viewer Pro's shown. HTML Viewer also leads on review sentiment (25% vs 10%) and iOS requirement (13.0 vs 16.6). STL File Viewer Pro's advantage is ratings volume (65 vs 9). On price, rating, update cadence and in-app purchases 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 File Viewer Pro sells 3 in-app purchases, starting at $1.99 per 7 days and HTML Viewer sells 4 in-app purchases, starting at $14.99 per year. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.5 for STL File Viewer Pro against 4.6 for HTML Viewer. That said, the two scores are not equally well evidenced: STL File Viewer Pro has 65 ratings behind it against 9, so its average is the more settled of the two. Written reviews are what separate them: 10% of STL File Viewer Pro's written reviews are positive against 25% of HTML Viewer's.

UpkeepUpdate frequency

STL File Viewer Pro ships an update fortnightly, HTML Viewer every 8 days. The most recent releases landed on September 24, 2026 and September 16, 2026 respectively.

Scorecard4 real differences · 7 level
STL File Viewer Pro versus HTML Viewer: the parameters behind the verdict, then further details
ParameterSTL File Viewer ProHTML Viewer
PriceFreeFree
Rating4.5 (65 ratings)4.6 (9 ratings) — better
Positive reviews10.0% of reviews25.0% of reviews — better
Number of ratings65 — better9
Update frequencyFortnightlyEvery 8 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
Best chart rank#33 — better#61
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.613.0 — better
Further details — not scored
Size16 MB84 MB
Age rating4+17+
DeveloperAndeesh Mehdi SyedUtsav Mangla

Customer experience

STL File Viewer Pro

All ratings65 ratings
Positive86.2%
Neutral1.5%
Negative12.3%
Written reviews10 reviews
Positive10.0%
Neutral0.0%
Negative90.0%

HTML Viewer

All ratings9 ratings
Positive88.9%
Neutral0.0%
Negative11.1%
Written reviews4 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

In-app purchases

3 purchases

STL File Viewer Pro

Subscriptions3
  • Weekly3 Days trial$1.997 Days
  • Monthly3 Days trial$3.991 Month
  • Ad Free for 1 Year3 Days trial$24.991 Year
4 purchases

HTML Viewer

Subscriptions3
  • HTML Viewer - All access - Mid$14.991 Year
  • HTML Viewer - All access - Max14 Days trial$19.991 Year
  • HTML Viewer - All access - Max$19.991 Year
One-time1
  • HTML Viewer - Lifetime$9.99

Questions

Is STL File Viewer Pro free?
STL File Viewer Pro is free to download, with in-app purchases available.
Is HTML Viewer free?
HTML Viewer is free to download, with in-app purchases available.
Which has better reviews, STL File Viewer Pro or HTML Viewer?
HTML Viewer is rated higher. STL File Viewer Pro averages 4.5 out of 5 from 65 ratings, while HTML Viewer averages 4.6 from 9 ratings.
Do STL File Viewer Pro or HTML Viewer have ads?
STL File Viewer Pro shows ads; HTML Viewer does not.
Which is updated more often, STL File Viewer Pro or HTML Viewer?
STL File Viewer Pro ships an update fortnightly, and HTML Viewer every 8 days. Most recently, STL File Viewer Pro was updated on September 24, 2026 and HTML Viewer on September 16, 2026.
Which is more popular, STL File Viewer Pro or HTML Viewer?
STL File Viewer Pro currently peaks at #33 in the App Store charts, and HTML Viewer at #61. Chart position reflects recent download velocity rather than total install base.

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