# Calculator with reverse screen vs Flex Calculators

The clearest difference is in-app purchases: Calculator with reverse screen at none against Flex Calculators's 1. Flex Calculators's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

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

Calculator with reverse screen ships an update fortnightly, Flex Calculators every 10 days. The most recent releases landed on October 25, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Calculator with reverse screen | Flex Calculators |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 10 days** |
| Size | 35 MB | 37 MB |
| Requires iOS | 15.8.3 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [An Le](https://appshunter.io/developer/1863975090) |

## What reviewers say

### Calculator with reverse screen

[App page](https://appshunter.io/ios/app/calculator-with-reverse-screen/id6497792768)

**Features:** macOS Compatibility

**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 Calculator with reverse screen free?

Calculator with reverse screen 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 Calculator with reverse screen or Flex Calculators have ads?

Calculator with reverse screen shows ads; Flex Calculators does not.

### Which is updated more often, Calculator with reverse screen or Flex Calculators?

Calculator with reverse screen ships an update fortnightly, and Flex Calculators every 10 days. Most recently, Calculator with reverse screen was updated on October 25, 2026 and Flex Calculators on November 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*