Comparison

Autodesk Fusion 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

Autodesk Fusion

Collaborate on 3D designs from anywhere with this mobile app. View, comment on, and share CAD models in over 100 formats. It works with a companion cloud-based desktop product for product design and development.

Highlights
  • View over 100 file formats
  • Collaborate on 3D designs
  • Comment on project activities
  • Share designs with stakeholders
  • Search and highlight parts
  • Offline data access
Read full description

Autodesk Fusion™ for iPhone and iPad lets you collaborate on 3D designs with anyone inside or outside your company. With the Fusion app, you have the flexibility to view and collaborate on your Fusion CAD models—anytime, anywhere. The app supports more than 100 file formats including DWG, SLDPRT, IPT, IAM, CATPART,IGES, STEP, STL, making it easy to share designs with your team, clients, partners, and friends. The free app works in conjunction with its companion cloud-based desktop product, Autodesk Fusion™, a 3D CAD, CAM, and CAE tool for product design and development. * To use Fusion for iPhone and iPad, you will need to sign in with your Fusion account information. FEATURES View • Upload and view more than 100 data formats including SLDPRT, SAT, IGES, STEP, STL, OBJ, DWG, F3D, SMT, and DFX • View and track project activities and updates • Review large and small 3D designs and assemblies • Access design properties and complete parts lists • Isolate and hide components in the model for easy viewing • Navigate by touch with zoom, pan, and rotate Comment • Upload photos to share info or report project status • Comment on project activities Share • Share with stakeholders inside and outside your company • Share screenshots of the design with markups directly from the app Search • Search for parts in the model and see them automatically highlighted in the design SUPPORT: https://knowledge.autodesk.com/contact-support Optional Access + Storage: Store offline data if needed, so you can view your data anywhere, anytime + Photos: Access files or data stored on your device to view, share and markup + Camera: Take pictures such as drawings with app Fusion will still function even if a user does not give permissions to access these functions.

About

STL Viewer

View, explore, and edit 3D models on your iPhone or iPad. Basic viewing is included with purchase, with optional upgrades for advanced creation, editing, and reporting features. Models are processed locally for privacy.

Highlights
  • Open and view STL files
  • Rotate, pan, and zoom models
  • Basic model information inspection
  • Create and edit 3D models
  • Measure distances and angles
  • Export to multiple file formats
  • Generate local PDF reports
Features
Read full description

Open your STL file on iPhone or iPad and examine the model with rotation, zoom and technical views. Your app purchase includes basic viewing without a subscription. Pro and Studio are optional upgrades for creation, editing, inspection and reports. BASIC VIEWER Open binary or ASCII STL files. Orbit, pan and zoom, switch camera views, and inspect basic model information in solid or wireframe mode. PRO WORKSPACE Build with primitives and profiles; extrude and revolve shapes. Transform objects, preview Boolean operations and plane cuts, and use mesh repair tools. Organize multiple objects in local projects with undo, redo and saved revisions. Measure distances, angles and radii, and inspect sampled estimates of wall thickness and surface deviation. Export STL, OBJ, PLY, 3MF and GLB files, capture PNG images, and opt into project reminders. STUDIO REPORTS Studio includes Pro and adds local PDF reports with project information, geometry summaries and inspection annotations. IMPORTANT LIMITS Models are processed on your device, not uploaded to our servers. Projects and revisions are local. This app does not include cloud collaboration, SSO, STEP/B-rep CAD or manufacturing certification. Thickness and surface comparisons are sampled estimates, not certified measurements. File formats and mesh operations have safety limits and restrictions shown in the tools. STL does not record units; choose the correct unit for your model. OPTIONAL PLANS The app download is paid. Basic viewing needs no subscription. Creation, editing and advanced inspection require Pro or Studio; PDF reports require Studio. Monthly/annual subscriptions and Pro Lifetime are optional. The App Store displays prices and periods before purchase. Subscriptions renew automatically until cancelled in your Apple account settings. Restore Purchases is available in the app. Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://softwareideal.com.br/policy.html Support: https://softwareideal.com.br

Screenshots

Autodesk Fusion3 screens
STL Viewer2 screens

Verdict

The call

The clearest difference is price: Autodesk Fusion at Free against STL Viewer's $0.99. Autodesk Fusion also leads on in-app purchases (none vs 5) and ratings volume (4.1K vs 1). STL Viewer's advantage is review sentiment (100% vs 60%) and rating (5.0 vs 4.5). On update cadence, ads and device support 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

Autodesk Fusion is free to download; STL Viewer costs $0.99 up front. STL Viewer sells 5 in-app purchases, starting at $2.99 per month. Autodesk Fusion asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

STL Viewer holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Autodesk Fusion has 4.1K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 60% of Autodesk Fusion's written reviews are positive against 100% of STL Viewer's.

UpkeepUpdate frequency

Autodesk Fusion ships an update monthly, STL Viewer every 4 weeks. Both last shipped on November 3, 2026.

Scorecard7 real differences · 3 level
Autodesk Fusion versus STL Viewer: the parameters behind the verdict, then further details
ParameterAutodesk FusionSTL Viewer
PriceFree — better$0.99
Rating4.5 (4.1K ratings)5.0 (1 ratings) — better
Positive reviews59.8% of reviews100.0% of reviews — better
Number of ratings4.1K — better1
Update frequencyMonthlyEvery 4 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13 — better17.0
Further details — not scored
Size124 MB5 MB
Age rating4+4+
DeveloperAutodesk Inc.Felipe Marques de Barros

Customer experience

Autodesk Fusion

All ratings4,095 ratings
Positive89.4%
Neutral2.2%
Negative8.4%
Written reviews801 reviews
Positive59.8%
Neutral9.2%
Negative31.0%

STL Viewer

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Autodesk Fusion

Reported bugs

4 issues
  • Fails to open files
  • White screens and rendering issues
  • Inconsistent behavior across devices
  • Frequent crashes on latest iOS versions

Requested features

4 requests
  • Full editing capabilities on iPad
  • Ability to hide/show components
  • Improved rendering and visualization
  • Offline access and file management

STL Viewer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Autodesk Fusion

No in-app purchases

5 purchases

STL Viewer

Subscriptions4
  • STL Viewer Pro Mensal$2.991 Month
  • STL Viewer Studio Mensal$5.991 Month
  • STL Viewer Pro Anual$22.991 Year
Show 1 more
  • STL Viewer Studio Anual$49.991 Year
One-time1
  • STL Viewer Pro Vitalício$39.99

Questions

Is Autodesk Fusion free?
Autodesk Fusion is free to download, with no in-app purchases.
Is STL Viewer free?
STL Viewer costs $0.99, and also offers in-app purchases.
Which has better reviews, Autodesk Fusion or STL Viewer?
STL Viewer is rated higher. Autodesk Fusion averages 4.5 out of 5 from 4.1K ratings, while STL Viewer averages 5.0 from 1 ratings.
Do Autodesk Fusion or STL Viewer have ads?
Neither Autodesk Fusion nor STL Viewer shows ads.
Which is updated more often, Autodesk Fusion or STL Viewer?
Autodesk Fusion ships an update monthly, and STL Viewer every 4 weeks. Most recently, Autodesk Fusion was updated on November 3, 2026 and STL Viewer on November 3, 2026.

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