Kalculator vs Plus4U Key
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Kalculator
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.
- Complex calculation support
- Operation history storage
- Numeric spreadsheet functionality
- Cross-device syncing (iPhone, iPad, Apple Watch)
- Modern interface
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Have you noticed that your phone’s calculator isn’t any better than the ones from back in the 80s? Do you find yourself using Google or Excel to calculate something like this: (80*200)/29+56 ? Then, Kalculator is definitely for you. Kalculator makes you fast on your feet with numbers no matter where you are. Face it, you always find yourself needing to find the middle ground between a scientific graphing calculator and the one you threw away 10 years ago. Kalculator is that sweet spot. Kalculator can store your operations history and resolve complex calculations. It’s like a single cloumn numeric spreadsheet on your phone. It works seamlessly in your iPhone, iPad and Apple Watch and helps keep everything in sync.
Plus4U Key
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.
- Secure login to Plus4U
- Convenient access
- Enhanced security
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Plus4U Key enables secure and convenient login to the Plus4U system
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Kalculator | Plus4U Key |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (19 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 38.5% of reviews | — |
| Number of ratings | 19 — better | 1 |
| Update frequency | Every 6 weeks — better | Every 6 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod, Apple TV, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 41 MB | 87 MB |
| Age rating | 4+ | 4+ |
| Developer | Koombea, Inc. | Plus4U Net a.s. |
In-app purchases
Kalculator
- Old School Theme Pack$0.99
- Dark Theme Pack$0.99
- Pastel Theme Pack$0.99
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- Vibrant Theme Pack$0.99
- Classic Theme Pack$0.99
- Light Theme Pack$0.99
- Seasons Theme Pack$0.99
Plus4U Key
No in-app purchases
Questions
Is Kalculator free?
Is Plus4U Key free?
Which has better reviews, Kalculator or Plus4U Key?
Do Kalculator or Plus4U Key have ads?
Which is updated more often, Kalculator or Plus4U Key?
Other comparisons
