Comparison

BasicATTCalc vs 3D Model Viewer

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

Head to head
About

BasicATTCalc

Features
Read full description

Basic Attenuator Calculator (BasicATTCalc) helps you calculate various resistive attenuators which are used in many audio, video and RF circuit design applications. The standard resistance values based on E-series numbers are outputted in inputting necessary conditions such as source impedance, load impedance and attenuation. Features The calculable attenuators and impedance converters are as follows: - Type T - Type Pi (π) - Type H - Type O - Type Bridged T - Type Bridged H - Type L (Impedance converter) - Type U (Impedance converter) Calculated resistance values are displayed with ideal values or the following E-series number specified either. E12, E24, E48, E96, E192 The most suitable values are calculated in selecting priority calculation whether Simple or Precision. - Simple: Perform calculations that the nearest values are derived to desired impedances and attenuation by the simple structure - Precision: Perform calculations that the nearest values are derived to desired impedances and attenuation by consisting of up to 4 resistors per an element In addition to resistance values, this application provides you with input impedance, output impedance and calculated attenuation with mismatch loss. If necessary, it is able to calculate power dissipated by each resistor and parameters such as reflection coefficient, VSWR, return loss and mismatch loss. Attention Because the standard resistors are used, the following restriction is set up. - Range of resistance value: 1Ω ~ 10MΩ (except ideal values)

About

3D Model Viewer

Explore and interact with 3D models on your mobile device. Simulate the 3D printing process to identify potential issues before committing to a print. Visualize your models in augmented reality, adjusting scale and rotation within your real-world environment.

Highlights
  • View 3D models in real-time
  • Rotate, zoom, and paint models
  • Simulate 3D printing process
  • View models in AR mode
  • Adjust scale and rotation in AR
  • Supports multiple 3D file formats
Features
Read full description

Have you ever wanted to view and interact with 3D Models? 3D Model Viewer allows you to view compatible 3D Models using your mobile device. You can even simulate 3D Printing and view your model in AR mode! -- View 3D Models Import and view your 3D models in real time, rotating, zooming and painting! -- Simulate 3D Printing Watch a simulation of your model being 3D printed from bottom to top and identify any potential problems with the model without wasting any printing material! -- AR Mode View your 3D models inserted into the real world, being able to adjust scale and rotation! -- Compatible with many formats 3D Model Viewer supports the following formats: .stl, .obj*, .abc, .ply, .usdz, .usd, .usda, .dae *.obj files can be imported with textures in the format of a .zip file 3D Model Viewer is now available for all iOS devices!

Screenshots

BasicATTCalc4 screens
3D Model Viewer3 screens

Verdict

The call

The clearest difference is price: 3D Model Viewer at Free against BasicATTCalc's $1.99. 3D Model Viewer also leads on update cadence (weekly vs every 29 months). BasicATTCalc's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement 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

3D Model Viewer is free to download; BasicATTCalc costs $1.99 up front. 3D Model Viewer sells 1 one-off in-app purchase. BasicATTCalc asks for nothing beyond the download.

UpkeepUpdate frequency

BasicATTCalc ships an update every 29 months, 3D Model Viewer weekly. The most recent releases landed on October 7, 2026 and November 12, 2026 respectively.

Scorecard3 real differences · 7 level
BasicATTCalc versus 3D Model Viewer: the parameters behind the verdict, then further details
ParameterBasicATTCalc3D Model Viewer
Price$1.99Free — better
Rating—4.4 (365 ratings) — better
Positive reviews—20.5% of reviews
Number of ratings—365 — better
Update frequencyEvery 29 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Vision Pro — better
Requires iOS14.5 — better15.6
Further details — not scored
Size7 MB17 MB
Age rating4+4+
DeveloperTAKAHIKO FUKUYAMAArthur Eduardo Skaetta Alvarez Desenvolvimento de Software LTDA.

Bugs and requests

BasicATTCalc

Not enough reviews yet to summarise bugs or requests.

3D Model Viewer

Reported bugs

10 issues
  • App crashes immediately after upload
  • App crashes when importing PLY files
  • App crashes after payment
  • App crashes when importing large files
  • App crashes on iPad Pro
Show 5 more
  • VR crashes
  • Model centering limits viewing
  • Paint function assigns random color
  • Incorrect AR sizing
  • Y axis is up in AR

Requested features

11 requests
  • Allow changing background color
  • Allow changing lighting positions
  • Add axis lock object rotation
  • Add way to rotate side to side (turntable)
  • Option to slow down rotation/movements
Show 6 more
  • Add arrange by recent for downloaded STLs
  • Add ability to list most recent STL at top
  • Allow models to scale larger in AR mode
  • Add free rotation
  • Improve AR sizing accuracy
  • Use Z axis as up for AR and print sim

In-app purchases

None

BasicATTCalc

No in-app purchases

1 purchases

3D Model Viewer

One-time1
  • Model Viewer Premium$1.99

Questions

Is BasicATTCalc free?
BasicATTCalc costs $1.99, with no in-app purchases.
Is 3D Model Viewer free?
3D Model Viewer is free to download, with in-app purchases available.
Do BasicATTCalc or 3D Model Viewer have ads?
Neither BasicATTCalc nor 3D Model Viewer shows ads.
Which is updated more often, BasicATTCalc or 3D Model Viewer?
BasicATTCalc ships an update every 29 months, and 3D Model Viewer weekly. Most recently, BasicATTCalc was updated on October 7, 2026 and 3D Model Viewer on November 12, 2026.

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