# A4Calc vs Black Widow Key Machine

The clearest difference is price: Black Widow Key Machine at Free against A4Calc's $4.99. Black Widow Key Machine also leads on update cadence (every 5 weeks vs every 8 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Black Widow Key Machine is free to download; A4Calc costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

A4Calc ships an update every 8 months, Black Widow Key Machine every 5 weeks. The most recent releases landed on September 30, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | A4Calc | Black Widow Key Machine |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[4.5 (2 ratings)](https://appshunter.io/ios/app/black-widow-key-machine/id1577877042/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 5 weeks** |
| Monetization | — | Free |
| Size | 2 MB | 149 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Farren Domenici](https://appshunter.io/developer/583666476) | [American Key Supply](https://appshunter.io/developer/1128576890) |

## What reviewers say

### A4Calc

[App page](https://appshunter.io/ios/app/a4calc/id734140182)

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

**In-app purchases:** none


### Black Widow Key Machine

[App page](https://appshunter.io/ios/app/black-widow-key-machine/id1577877042)

This mobile tool allows locksmiths to quickly cut various types of keys, including high-security, edge-cut, dimple, tibbe, and tubular blanks. It connects via Bluetooth to a mobile device for cutting keys by code, duplicating, and progression.

**Highlights:** Cuts high-security keys, Cuts edge-cut keys, Cuts dimple keys, Cuts tibbe keys, Cuts tubular keys, Bluetooth connectivity, Cut by code functionality

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is A4Calc free?

A4Calc costs $4.99, with no in-app purchases.

### Is Black Widow Key Machine free?

Black Widow Key Machine is free to download, with no in-app purchases.

### Do A4Calc or Black Widow Key Machine have ads?

Neither A4Calc nor Black Widow Key Machine shows ads.

### Which is updated more often, A4Calc or Black Widow Key Machine?

A4Calc ships an update every 8 months, and Black Widow Key Machine every 5 weeks. Most recently, A4Calc was updated on September 30, 2026 and Black Widow Key Machine on September 6, 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.*