Comparison

SpinFire XR vs Digit 3D CAD

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

Head to head
About

SpinFire XR

Read full description

Bring your CAD designs to life in AR, improve decision making and get to market faster. TheoremAR enables you to visualize and interact with your 3D engineering design data in the real-world through your iPhone or iPad, whether that be from your office, a showroom, or your living room. MODES • Image tracking – Track 3D digital content against a chosen image target to place the content in a desired location. • AR Viewer – Use your environment and place 3D digital content on recognised surfaces to help visualize 3d models. • Model Tracking (target model) – Overlays the 3D digital content over an already created prototype. • Model Tracking (alternate model) – Overlays other selected content over the target model to view models within context. FEATURES • Manipulate your 3D model in the real-world by using the Manipulation box to move, rotate and revolve your model. • Scale your model to get a closer look at your design. • Hide and occlude parts and components to only see what is necessary. • Use measurement tools including point-to-point, offset and vertex snapping. • Display and review metadata for each component. • Capture screenshots of the current view of your model, mark-up your images and save to your device or server. • Enable world occlusion to see if models fit within their current space.

About

Digit 3D CAD

Create detailed 3D models and technical drawings on your iPhone or iPad. This app offers parametric modeling, sketching tools with Apple Pencil support, and assembly capabilities. Import and export various file formats for seamless workflow.

Highlights
  • Parametric 3D modeling
  • Sketching with constraints
  • Assembly and 2D drawings
  • Apple Pencil support
  • Import/export multiple file formats
  • Parametric history editing
Features
Read full description

Digit 3D is parametric 3D CAD for iPhone and iPad: sketch, model, assemble and make drawings. Sketch • Lines, circles, arcs, splines, ellipses, polygons and slots, with dimensions and constraints • Mirror; linear, circular and along-curve patterns; trim, extend, chamfer and fillet • Apple Pencil support for precise drawing Model • Extrude, revolve, sweep, loft, shell, fillet, chamfer, hole, thread, pattern and mirror • Auto boolean: cuts when it overlaps, joins when it touches, new body when apart • Direct editing: move, rotate and copy faces, with adjacent fillets following along • Surfaces, 3D curves and 3D splines • Parametric history: edit any step at any time, and replay how the model was built Assembly and drawings • Assembly lives in the modeling workspace: new parts, move parts, auto-detected mates, clash check • 2D drawings with standard views, sections and dimensions; 3D annotations export with STEP Two interfaces • Full: every command, with customizable side rails • Simple: tap a face and drag the arrow, easy for beginners Files • Import STEP, IGES, STL, OBJ, 3MF, 3DM, Parasolid (X_T) and DXF drawings • Projects are saved as encrypted .d3d files Privacy Policy: https://digit3d.top/privacy.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

SpinFire XR4 screens
Digit 3D CAD4 screens

Verdict

The call

The clearest difference is in-app purchases: SpinFire XR at none against Digit 3D CAD's 4. SpinFire XR also leads on iOS requirement (13.0 vs 16.4). Digit 3D CAD's advantage is update cadence (every 2 days vs every 5 months). On price, 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

Both are free to download. Digit 3D CAD sells 4 in-app purchases, starting at $1.99 per month. SpinFire XR asks for nothing beyond the download.

UpkeepUpdate frequency

SpinFire XR ships an update every 5 months, Digit 3D CAD every 2 days. Both last shipped on November 3, 2026.

Scorecard3 real differences · 7 level
SpinFire XR versus Digit 3D CAD: the parameters behind the verdict, then further details
ParameterSpinFire XRDigit 3D CAD
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews—94.4% of reviews
Number of ratings—1 — better
Update frequencyEvery 5 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better16.4
Further details — not scored
Size227 MB78 MB
Age rating4+4+
DeveloperTheorem Solutions Limited运保 罗

In-app purchases

None

SpinFire XR

No in-app purchases

4 purchases

Digit 3D CAD

Subscriptions4
  • Digit 3D Pro (monthly)$1.991 Month
  • Digit 3D Max (monthly)$2.991 Month
  • Digit 3D Pro (yearly)$9.991 Year
Show 1 more
  • Digit 3D Max (yearly)$17.991 Year

Questions

Is SpinFire XR free?
SpinFire XR is free to download, with no in-app purchases.
Is Digit 3D CAD free?
Digit 3D CAD is free to download, with in-app purchases available.
Do SpinFire XR or Digit 3D CAD have ads?
Neither SpinFire XR nor Digit 3D CAD shows ads.
Which is updated more often, SpinFire XR or Digit 3D CAD?
SpinFire XR ships an update every 5 months, and Digit 3D CAD every 2 days. Most recently, SpinFire XR was updated on November 3, 2026 and Digit 3D CAD on November 3, 2026.

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