# EF vs Echo Calculate

The clearest difference is in-app purchases: EF at none against Echo Calculate's 1. EF also leads on iOS requirement (12.0 vs 15.6). Echo Calculate's advantage is update cadence (every 6 months vs every 48 months). On price, ads and device support there is nothing between them.

Both are free to download. Echo Calculate sells 1 one-off in-app purchase. EF asks for nothing beyond the download.

EF ships an update every 48 months, Echo Calculate every 6 months. The most recent releases landed on October 1, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | EF | Echo Calculate |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 48 months | **Every 6 months** |
| Size | 22 MB | 26 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Keiji Matsui](https://appshunter.io/developer/365287272) | [Gundogan Emre](https://appshunter.io/developer/1651146056) |

## What reviewers say

### EF

[App page](https://appshunter.io/ios/app/ef-ejection-fraction/id1342185936)

**Features:** macOS Compatibility

**In-app purchases:** none


### Echo Calculate

[App page](https://appshunter.io/ios/app/echo-calculate/id1660468437)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Echo Calculate Premium | $3.99 | one-time |


## Frequently asked questions

### Is EF free?

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

### Is Echo Calculate free?

Echo Calculate is free to download, with in-app purchases available.

### Do EF or Echo Calculate have ads?

Neither EF nor Echo Calculate shows ads.

### Which is updated more often, EF or Echo Calculate?

EF ships an update every 48 months, and Echo Calculate every 6 months. Most recently, EF was updated on October 1, 2026 and Echo Calculate on October 3, 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.*