# Cortona3D Viewer vs Thermal Engineering Calc

The clearest difference is rating: Thermal Engineering Calc at 4.7 against Cortona3D Viewer's 3.0. Thermal Engineering Calc also leads on review sentiment (50% vs 40%). Cortona3D Viewer's advantage is update cadence (every 7 months vs every 15 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

Cortona3D Viewer costs $2.99 and Thermal Engineering Calc $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Thermal Engineering Calc holds the better App Store score, 4.7 against 3.0. Both are backed by a comparable volume of ratings — 4 and 6 respectively. Written reviews point the same way: 40% of Cortona3D Viewer's written reviews are positive against 50% of Thermal Engineering Calc's.

Cortona3D Viewer ships an update every 7 months, Thermal Engineering Calc every 15 months. Both last shipped on October 23, 2026.

## The numbers

| Metric | Cortona3D Viewer | Thermal Engineering Calc |
| --- | --- | --- |
| Price | $2.99 | $2.99 |
| Rating | [3.0 (4 ratings)](https://appshunter.io/ios/app/cortona3d-viewer/id471275514/reviews) | **[4.7 (6 ratings)](https://appshunter.io/ios/app/thermal-engineering-calc/id684142208/reviews)** |
| Number of ratings | 4 | **6** |
| Positive reviews | 40.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 15 months |
| Monetization | Paid | Paid |
| Size | 96 MB | 3 MB |
| Requires iOS | **15.0** | 16.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ParallelGraphics](https://appshunter.io/developer/471275517) | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) |

## What reviewers say

### Cortona3D Viewer

[App page](https://appshunter.io/ios/app/cortona3d-viewer/id471275514)

View interactive 3D and 2D product catalogs, work instructions, and maintenance guides. Immerse yourself in 3D procedures and VRML scenes with augmented reality on your iPhone and iPad. Supports legacy 2D and interactive 3D content derived from CAD.

**Highlights:** Augmented reality support, Interactive 3D and 2D content, Multi-touch gestures for navigation, Exploded views and bill of materials, Part search and hide/show, Step-by-step instructions, Content upload and sharing

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Thermal Engineering Calc

[App page](https://appshunter.io/ios/app/thermal-engineering-calc/id684142208)

This app provides 44 calculators for thermal engineering parameters, along with thermodynamics tables, formulas, and definitions. It's a comprehensive tool for mechanical engineers and students needing to perform various thermal calculations.

**Highlights:** 44 thermal engineering calculators, Thermodynamics tables, Formulas and definitions, Carnot and Rankine efficiency calculators, Heat transfer calculations, Temperature conversion

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Cortona3D Viewer free?

Cortona3D Viewer costs $2.99, with no in-app purchases.

### Is Thermal Engineering Calc free?

Thermal Engineering Calc costs $2.99, with no in-app purchases.

### Which has better reviews, Cortona3D Viewer or Thermal Engineering Calc?

Thermal Engineering Calc is rated higher. Cortona3D Viewer averages 3.0 out of 5 from 4 ratings, while Thermal Engineering Calc averages 4.7 from 6 ratings.

### Do Cortona3D Viewer or Thermal Engineering Calc have ads?

Neither Cortona3D Viewer nor Thermal Engineering Calc shows ads.

### Which is updated more often, Cortona3D Viewer or Thermal Engineering Calc?

Cortona3D Viewer ships an update every 7 months, and Thermal Engineering Calc every 15 months. Most recently, Cortona3D Viewer was updated on October 23, 2026 and Thermal Engineering Calc on October 23, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*