# Kaliper vs Black Widow Key Machine

The clearest difference is in-app purchases: Black Widow Key Machine at none against Kaliper's 1. Black Widow Key Machine also leads on ads (none vs shown) and update cadence (every 5 weeks vs every 8 months). Kaliper's advantage is ratings volume (8 vs 2). On price, rating and device support there is nothing between them.

Both are free to download. Kaliper sells 1 one-off in-app purchase. Black Widow Key Machine asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for Kaliper against 4.5 for Black Widow Key Machine. Both are backed by a comparable volume of ratings — 8 and 2 respectively.

Kaliper ships an update every 8 months, Black Widow Key Machine every 5 weeks. The most recent releases landed on August 25, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | Kaliper | Black Widow Key Machine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (8 ratings)](https://appshunter.io/ios/app/kaliper/id1469528726/reviews)** | [4.5 (2 ratings)](https://appshunter.io/ios/app/black-widow-key-machine/id1577877042/reviews) |
| Number of ratings | **8** | 2 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 8 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 4 MB | 149 MB |
| Requires iOS | 14.0 | **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

### Kaliper

[App page](https://appshunter.io/ios/app/kaliper/id1469528726)

Measure key cuts accurately using your device's camera. This utility helps decode keys when a physical caliper is unavailable or difficult to read. Offers predefined systems and custom measurement options for various lock types.

**Highlights:** Measure key cuts with device camera, Predefined lock systems, Custom key measurement input, Ad-free upgrade option, Supports various lock brands

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kaliper Full Version | $1.99 | one-time |


### 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 Kaliper free?

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

### Is Black Widow Key Machine free?

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

### Which has better reviews, Kaliper or Black Widow Key Machine?

Kaliper is rated higher. Kaliper averages 4.6 out of 5 from 8 ratings, while Black Widow Key Machine averages 4.5 from 2 ratings.

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

Kaliper shows ads; Black Widow Key Machine does not.

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

Kaliper ships an update every 8 months, and Black Widow Key Machine every 5 weeks. Most recently, Kaliper was updated on August 25, 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.*