# KuCalc vs Flex Calculators

The clearest difference is in-app purchases: KuCalc at none against Flex Calculators's 1. KuCalc also leads on iOS requirement (11.0 vs 15.1). Flex Calculators's advantage is update cadence (every 10 days vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Flex Calculators sells 1 one-off in-app purchase. KuCalc asks for nothing beyond the download.

KuCalc ships an update every 3 months, Flex Calculators every 10 days. The most recent releases landed on October 7, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | KuCalc | Flex Calculators |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 10 days** |
| Size | 1 MB | 37 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Mineaki Sakatoku](https://appshunter.io/developer/1674976728) | [An Le](https://appshunter.io/developer/1863975090) |

## What reviewers say

### KuCalc

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

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

**In-app purchases:** none


### Flex Calculators

[App page](https://appshunter.io/ios/app/flex-calculators/id6761326502)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $4.99 | one-time |


## Frequently asked questions

### Is KuCalc free?

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

### Is Flex Calculators free?

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

### Do KuCalc or Flex Calculators have ads?

Neither KuCalc nor Flex Calculators shows ads.

### Which is updated more often, KuCalc or Flex Calculators?

KuCalc ships an update every 3 months, and Flex Calculators every 10 days. Most recently, KuCalc was updated on October 7, 2026 and Flex Calculators on October 16, 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.*