# Trigonometric Calculation vs CAD FastView

The clearest difference is in-app purchases: Trigonometric Calculation at none against CAD FastView's 3. CAD FastView's advantage is ads (none vs shown) and update cadence (fortnightly vs every 6 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. CAD FastView sells 3 in-app purchases, starting at $6.99 per 7 days. Trigonometric Calculation asks for nothing beyond the download.

Trigonometric Calculation ships an update every 6 weeks, CAD FastView fortnightly. The most recent releases landed on October 13, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Trigonometric Calculation | CAD FastView |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (50 ratings)](https://appshunter.io/ios/app/cad-fastview-dwg-viewer/id6461084049/reviews)** |
| Number of ratings | — | **50** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Fortnightly** |
| Monetization | — | Freemium |
| Size | 5 MB | 33 MB |
| Requires iOS | **15.5** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Risako Asai](https://appshunter.io/developer/1671273580) | [镇源 余](https://appshunter.io/developer/1702066939) |

## What reviewers say

### Trigonometric Calculation

[App page](https://appshunter.io/ios/app/trigonometric-calculation/id1636196284)

**Features:** macOS Compatibility

**In-app purchases:** none


### CAD FastView

[App page](https://appshunter.io/ios/app/cad-fastview-dwg-viewer/id6461084049)

View, convert, and print CAD drawings on your mobile device. Supports DWG, DXF, and PDF formats with iCloud sync and Wi-Fi printing. Ideal for architects, engineers, and construction professionals.

**Highlights:** Fast DWG/DXF viewing, Convert drawings to PDF, Wi-Fi printing, iCloud synchronization, Layer layout management, Multiple viewing options

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $6.99 | per 7 days |
| Monthly | $12.99 | per month |
| Yearly | $29.99 | per year |


## Frequently asked questions

### Is Trigonometric Calculation free?

Trigonometric Calculation is free to download, with no in-app purchases.

### Is CAD FastView free?

CAD FastView is free to download, with in-app purchases available.

### Do Trigonometric Calculation or CAD FastView have ads?

Trigonometric Calculation shows ads; CAD FastView does not.

### Which is updated more often, Trigonometric Calculation or CAD FastView?

Trigonometric Calculation ships an update every 6 weeks, and CAD FastView fortnightly. Most recently, Trigonometric Calculation was updated on October 13, 2026 and CAD FastView on October 9, 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.*