# NVS Viewer vs Cuspart

The clearest difference is in-app purchases: NVS Viewer at none against Cuspart's 4. NVS Viewer also leads on ads (none vs shown) and iOS requirement (12.0 vs 16.0). Cuspart's advantage is update cadence (every 4 months vs every 60 months). On price and device support there is nothing between them.

Both are free to download. Cuspart sells 4 in-app purchases, starting at $0.99 per month. NVS Viewer asks for nothing beyond the download.

NVS Viewer ships an update every 60 months, Cuspart every 4 months. The most recent releases landed on September 16, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | NVS Viewer | Cuspart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cuspart-mycal/id1546543143/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 60 months | **Every 4 months** |
| Monetization | — | Free with in-app purchases |
| Size | 9 MB | 13 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [キング通信工業株式会社](https://appshunter.io/developer/886661736) | [Mustafa Tolga DALBUDAK](https://appshunter.io/developer/1479052908) |

## What reviewers say

### NVS Viewer

[App page](https://appshunter.io/ios/app/nvs-viewer/id1086866918)

**Features:** macOS Compatibility

**In-app purchases:** none


### Cuspart

[App page](https://appshunter.io/ios/app/cuspart-mycal/id1546543143)

This app offers a professional-grade calculator with advanced math functions, a constants library, and intuitive history tracking. Customize your experience with various color themes and an accessible interface designed for ease of use.

**Highlights:** Basic and advanced arithmetic, Roots, powers, and logarithms, Constants library (π, e), Operation history, Customizable color themes, Accessible UI design

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month Subscription | $0.99 | per month |
| 3 Month Subscription | $2.99 | per 3 months |
| 12 Month Subscription | $9.99 | per year |
| Remove Ads | $2.49 | one-time |


## Frequently asked questions

### Is NVS Viewer free?

NVS Viewer is free to download, with no in-app purchases.

### Is Cuspart free?

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

### Do NVS Viewer or Cuspart have ads?

Cuspart shows ads; NVS Viewer does not.

### Which is updated more often, NVS Viewer or Cuspart?

NVS Viewer ships an update every 60 months, and Cuspart every 4 months. Most recently, NVS Viewer was updated on September 16, 2026 and Cuspart on September 21, 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.*