Comparison

GoodWill vs STL Viewer

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

Head to head
About

GoodWill

Read full description

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About

STL Viewer

Features
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View STL 3D models and prepare them for 3D printing on your iPhone or iPad. Built for makers, engineers, designers, and 3D printing enthusiasts who need to open, inspect, measure, and export 3D mesh files with precision. KEY FEATURES UNIVERSAL STL SUPPORT • STL (binary and ASCII) • High-poly mesh handling • Fast file opening from Files app, share sheet, or AirDrop • Direct import from Thingiverse, Printables, MakerWorld, and other 3D model sites PRECISION MEASUREMENT TOOLS • Distance measurement between any two points on the mesh • Angle measurement across three vertices • Bounding box with exact X, Y, Z dimensions • Measurement units: mm, cm, inches PROFESSIONAL 3D INSPECTION • Solid and wireframe render modes • Smooth orbit camera with pinch-to-zoom, pan, and rotate gestures • Floor grid overlay for scale reference • Customizable model color • Real-time lit shading with directional and ambient lighting EXPORT & SHARE • Export to OBJ, DAE, and DXF formats • Capture high-resolution screenshots of any view • Share directly to Prusa Slicer, Bambu Studio, Creality Print, and other slicers • Preserve mesh integrity across exports PERFECT FOR • 3D printer owners checking models before slicing • Engineers inspecting CAD exports as STL • Designers reviewing client meshes on the go • Makers browsing Thingiverse, Printables, MakerWorld files • Students learning 3D modeling and printing • Anyone who needs to view STL files without a desktop PRECISION VIEWER • Hardware-accelerated 3D rendering • Infinite pinch-to-zoom for detailed inspection • Smooth gesture controls for any model size • Handles models with hundreds of thousands of triangles PRIVACY FIRST • All processing happens entirely on-device • No internet connection required • Your files never leave your device • Works completely offline — 100% private and secure Download now and inspect your STL files with professional-grade precision. Privacy Policy: https://nagy-legal.vercel.app/stl-viewer/privacy.html

Screenshots

GoodWill3 screens
STL Viewer4 screens

Verdict

The call

The clearest difference is in-app purchases: GoodWill at none against STL Viewer's 1. GoodWill also leads on iOS requirement (11.0 vs 15.1). STL Viewer's advantage is device support. On price there is nothing between them.

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

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. STL Viewer sells 1 one-off in-app purchase. GoodWill asks for nothing beyond the download.

Scorecard3 real differences Ā· 3 level
GoodWill versus STL Viewer: the parameters behind the verdict, then further details
ParameterGoodWillSTL Viewer
PriceFreeFree
Update frequency—Every 8 days
Ads—No
In-app purchasesNo — betterYes
Devices—iPhone, iPad, iPod — better
Requires iOS11.0 — better15.1
Further details — not scored
Size26 MB39 MB
Age rating17+12+
DeveloperAdaptive Consultants LimitedMohamed Nagy

In-app purchases

None

GoodWill

No in-app purchases

1 purchases

STL Viewer

One-time1
  • Lifetime$12.99

Questions

Is GoodWill free?
GoodWill is free to download, with no in-app purchases.
Is STL Viewer free?
STL Viewer is free to download, with in-app purchases available.

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