# Calculation Transformers vs EYN Tools

The clearest difference is update cadence: EYN Tools at every 2 weeks against Calculation Transformers's every 5 months. Calculation Transformers's advantage is iOS requirement (13.0 vs 26.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Calculation Transformers sells 1 one-off in-app purchase and EYN Tools sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Calculation Transformers ships an update every 5 months, EYN Tools every 2 weeks. The most recent releases landed on September 30, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Calculation Transformers | EYN Tools |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Size | 56 MB | 19 MB |
| Requires iOS | **13.0** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nanjibhai Gorasiya](https://appshunter.io/developer/1834066312) | [Luke Gatz](https://appshunter.io/developer/1894551599) |

## What reviewers say

### Calculation Transformers

[App page](https://appshunter.io/ios/app/calculation-transformers/id6759037556)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime premium | $9.99 | one-time |


### EYN Tools

[App page](https://appshunter.io/ios/app/eyn-tools/id6762532138)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $3.99 | per month |
| Yearly Pro Plan | $29.99 | per year |
| Pro Lifetime | $79.99 | one-time |


## Frequently asked questions

### Is Calculation Transformers free?

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

### Is EYN Tools free?

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

### Do Calculation Transformers or EYN Tools have ads?

Neither Calculation Transformers nor EYN Tools shows ads.

### Which is updated more often, Calculation Transformers or EYN Tools?

Calculation Transformers ships an update every 5 months, and EYN Tools every 2 weeks. Most recently, Calculation Transformers was updated on September 30, 2026 and EYN Tools on September 14, 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.*