# Kalculator vs Plus4U Key

The clearest difference is rating: Kalculator at 4.2 against Plus4U Key's 1.0. Kalculator also leads on update cadence (every 6 weeks vs every 6 months) and ratings volume (19 vs 1). Plus4U Key's advantage is in-app purchases (none vs 7). On price, ads and monetization model there is nothing between them.

Both are free to download. Kalculator sells 7 one-off in-app purchases. Plus4U Key asks for nothing beyond the download.

Kalculator holds the better App Store score, 4.2 against 1.0. That said, the two scores are not equally well evidenced: Kalculator has 19 ratings behind it against 1, so its average is the more settled of the two.

Kalculator ships an update every 6 weeks, Plus4U Key every 6 months. The most recent releases landed on November 1, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Kalculator | Plus4U Key |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (19 ratings)](https://appshunter.io/ios/app/kalculator/id470043471/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/plus4u-key/id6443866595/reviews) |
| Number of ratings | **19** | 1 |
| Positive reviews | 38.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 6 months |
| Monetization | Free | Free |
| Size | 41 MB | 87 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | **iPhone, iPad, iPod, Apple TV, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Koombea, Inc.](https://appshunter.io/developer/337990786) | [Plus4U Net a.s.](https://appshunter.io/developer/899103157) |

## What reviewers say

### Kalculator

[App page](https://appshunter.io/ios/app/kalculator/id470043471)

This app offers a modern calculator experience, bridging the gap between basic phone calculators and complex scientific tools. It allows for complex calculations and stores operation history, functioning like a mobile numeric spreadsheet. It syncs seamlessly across Apple devices.

**Highlights:** Complex calculation support, Operation history storage, Numeric spreadsheet functionality, Cross-device syncing (iPhone, iPad, Apple Watch), Modern interface

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Old School Theme Pack | $0.99 | one-time |
| Dark Theme Pack | $0.99 | one-time |
| Pastel Theme Pack | $0.99 | one-time |
| Vibrant Theme Pack | $0.99 | one-time |
| Classic Theme Pack | $0.99 | one-time |
| Light Theme Pack | $0.99 | one-time |
| Seasons Theme Pack | $0.99 | one-time |


### Plus4U Key

[App page](https://appshunter.io/ios/app/plus4u-key/id6443866595)

This utility app provides a secure and convenient way to log into the Plus4U system. It simplifies access to your Plus4U account with enhanced security features.

**Highlights:** Secure login to Plus4U, Convenient access, Enhanced security

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

**In-app purchases:** none


## Frequently asked questions

### Is Kalculator free?

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

### Is Plus4U Key free?

Plus4U Key is free to download, with no in-app purchases.

### Which has better reviews, Kalculator or Plus4U Key?

Kalculator is rated higher. Kalculator averages 4.2 out of 5 from 19 ratings, while Plus4U Key averages 1.0 from 1 ratings.

### Do Kalculator or Plus4U Key have ads?

Neither Kalculator nor Plus4U Key shows ads.

### Which is updated more often, Kalculator or Plus4U Key?

Kalculator ships an update every 6 weeks, and Plus4U Key every 6 months. Most recently, Kalculator was updated on November 1, 2026 and Plus4U Key on October 27, 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.*