# e vs Unitify Converter

The clearest difference is update cadence: e at every 5 months against Unitify Converter's every 22 months. e also leads on iOS requirement (6.1 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

e ships an update every 5 months, Unitify Converter every 22 months. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | e | Unitify Converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/e-calcfree/id591591892/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 55.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 22 months |
| Monetization | Free | — |
| Size | 7 MB | 2 MB |
| Requires iOS | **6.1** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [e-skett Corp.](https://appshunter.io/developer/591591895) | [Omer Rahmanovic](https://appshunter.io/developer/1508177919) |

## What reviewers say

### e

[App page](https://appshunter.io/ios/app/e-calcfree/id591591892)

This scientific calculator supports engineering notation with prefixes like pico, nano, and mega. It offers a history feature to review past calculations and allows editing of formulas for recalculation. The free version has some limitations on history scrolling and saving.

**Highlights:** Scientific notation support, Engineering multipliers (p, n, u, m, k, M), History of past calculations, Editable formulas for recalculation, Unit conversion for engineering prefixes

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

**In-app purchases:** none


### Unitify Converter

[App page](https://appshunter.io/ios/app/unitify-converter/id1508177920)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is e free?

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

### Is Unitify Converter free?

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

### Do e or Unitify Converter have ads?

Neither e nor Unitify Converter shows ads.

### Which is updated more often, e or Unitify Converter?

e ships an update every 5 months, and Unitify Converter every 22 months. Most recently, e was updated on November 1, 2026 and Unitify Converter on November 7, 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.*