# Thumb calculator vs Flex Calculators

The clearest difference is in-app purchases: Thumb calculator 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. Thumb calculator asks for nothing beyond the download.

Thumb calculator ships an update every 2 weeks, Flex Calculators every 10 days. The most recent releases landed on October 4, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Thumb calculator | Flex Calculators |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **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

### Thumb calculator

[App page](https://appshunter.io/ios/app/thumb-calculator/id6499389948)

**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 Thumb calculator free?

Thumb calculator 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 Thumb calculator or Flex Calculators have ads?

Thumb calculator shows ads; Flex Calculators does not.

### Which is updated more often, Thumb calculator or Flex Calculators?

Thumb calculator ships an update every 2 weeks, and Flex Calculators every 10 days. Most recently, Thumb calculator was updated on October 4, 2026 and Flex Calculators on October 24, 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.*