# KuCalc vs HTMLViewer Pro+

The clearest difference is price: KuCalc at Free against HTMLViewer Pro+'s $2.99. KuCalc also leads on update cadence (every 3 months vs every 17 months) and device support (3 vs 1). On ads and in-app purchases there is nothing between them.

KuCalc is free to download; HTMLViewer Pro+ costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

KuCalc ships an update every 3 months, HTMLViewer Pro+ every 17 months. The most recent releases landed on October 30, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | KuCalc | HTMLViewer Pro+ |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 17 months |
| Size | 1 MB | 3 MB |
| Requires iOS | **11.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [Mineaki Sakatoku](https://appshunter.io/developer/1674976728) | [倩 罗](https://appshunter.io/developer/1653510118) |

## What reviewers say

### KuCalc

[App page](https://appshunter.io/ios/app/kucalc/id6445941447)

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

**In-app purchases:** none


### HTMLViewer Pro+

[App page](https://appshunter.io/ios/app/htmlviewer-pro-plus/id6746694144)

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

**In-app purchases:** none


## Frequently asked questions

### Is KuCalc free?

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

### Is HTMLViewer Pro+ free?

HTMLViewer Pro+ costs $2.99, with no in-app purchases.

### Do KuCalc or HTMLViewer Pro+ have ads?

Neither KuCalc nor HTMLViewer Pro+ shows ads.

### Which is updated more often, KuCalc or HTMLViewer Pro+?

KuCalc ships an update every 3 months, and HTMLViewer Pro+ every 17 months. Most recently, KuCalc was updated on October 30, 2026 and HTMLViewer Pro+ on November 6, 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.*