# Kaliper — Key Gauge Utility

> Mobile key gauge utility for measuring and decoding key cuts. (iPhone/iPad app by Farren Domenici.)

- Source: https://appshunter.io/ios/app/kaliper/id1469528726 (this page in markdown: same URL + `.md`)
- Developer: [Farren Domenici](https://appshunter.io/developer/583666476)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 4.60/5 from 8 App Store ratings · 6 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.0 · 4 MB
- Languages: American English
- Released: 2019-07-14
- Data updated: 2026-08-25
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/kaliper/id1469528726/reviews.md

## What is Kaliper?

Out-of-the-shop and out-of-the-van key gauge utility.

Have a key you need to decode but no caliper or key gauge nearby? Not 100% confident on your eyesight to read the cuts? Then use your iDevice to measure the key with Kaliper.

Kaliper is free to download with a purchase option for upgrading. It is recommended to get accustomed to the app prior to purchasing as with any tool, this app has a learning curve and with practice comes perfection.

The free version comes with two predefined systems: Arrow .014" and Schlage .015" (5 pin only).

The full version comes with eight predefined systems: Arrow .014" (5/6 pin), Best A2, A3, A4 (6/7 pin), Kwikset .023" (standard/titan), Sargent .020" (5/6 pin), Schlage .015" (5/6 pin), and Yale .019" (5/6 pin). In addition to custom key measurements and of course no ads.

Instructions:

On the main page begin by selecting your iDevice from the choices on the left, then select either a predefined system or custom. Do not use full screen on iPads.



Predefined: 

Lay your device on a flat surface and place your key on top of the silhouette, using the top shoulder (or bottom tip for best systems) as the primary focus for alignment. If aligned properly each of the cut markers will sit directly above each corresponding cut. If necessary, use the zoom control at the bottom for a better fit. Once the key is aligned, tap on the first down arrow in the upper right hand corner to lower the cut marker. Each tap represents a deeper cut with the depth displayed directly above the arrow. Keep tapping until the marker outlines the cut. If the marker starts to disappear behind the key use the up arrow to raise the marker. Do this for the remaining cuts to finish measuring your key.

Custom: The measuring process remains the same as the predefined systems, but as the markers are customizable some measurements need to be supplied before proceeding: Bow to First Cut: The distance from the center of the first cut to the top shoulder. Cut to Cut: The distance between the center of each cut. Shallowest Depth: The distance from the bottom of the blade to the center of the lowest cut in the system (i.e. Zero or One). Depth Increment: The distance between subsequent cuts. These measurements are typically found on pinning kits, however the system you are inputting may be found on the Charts page. From this chart simply tap on the system and all the measurements will be automatically applied. If inputting manually, type the measurements into the 4 boxes and tap Apply. The markers will adjust accordingly and you can begin measuring the key using the shoulder and blade for alignment. If the system uses a One as the shallowest cut, tap on 0 - 9 to reflect a 1 thru 10 cut system. Tap again to switch back.

Compatibility (sorted by screen size): iPhone SE2, SE3, 12 mini, 13 mini, 11 Pro, 11, 12, 12 Pro, 13, 13 Pro, 14, 14 Pro, 15, 15 Pro, 16, 16e, 17e, 16 Pro, 17, 17 Pro, Air, 11 Pro Max, 12 Pro Max, 13 Pro Max, 14 Plus, 14 Pro Max, 15 Plus, 15 Pro Max, 16 Plus, 16 Pro Max, 17 Pro Max

Found a bug? Something not working? Have a suggestion? Feel free to contact me via email: farren@phoxlocks.com

## Key features

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

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

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


## Recent user reviews (6 of 6)

All indexed reviews: https://appshunter.io/ios/app/kaliper/id1469528726/reviews.md

### 3/5 — Update

*2025-01-02*

It needs a update so you can scale a key on the screen. A great possible app if it was updated. Would be a five star for sure.

### 4/5 — iPhone

*2022-03-14*

Wish I was compatible with iphone 11 or12

### 5/5 — Does exactly what I need

*2021-04-27*

Working w/ facility carpenters on cutting new keys after an original code book was destroyed.

With a little figuring and few keys we decoded everything flawlessly.

### 1/5 — Kaliper app

*2020-06-18*

I have downloaded and paid for updates. Nothing has happened

**Developer response:** I’m sorry you’re having issues! Can you please contact me at phil@locksmithapps.com for support? I am not notified when reviews are left so I have no way of immediately addressing an issue if I don’t receive an email. The problem may be as simple as force closing the app and reopening and if the case please consider changing your rating.

### 3/5 — Weiser Keyway

*2020-03-05*

Would gladly buy the premium version if it offered a Weiser, WR5 option. Cool idea but not much use to me. Too bad

**Developer response:** Thanks for the feedback and suggestion. I happily welcome suggestions and offer support via email. I will note your wr5 request for a future version, but please know that the weiser specs are available in the custom charts.

### 5/5 — Simple and effective!

*2019-07-12*

This is a great app, Although Phil warns about a learning curve, the first key I tried it on seemed very clear, a depth higher or lower was obviously not the right depth.

## Frequently asked questions about Kaliper

### Does Kaliper have ads?

Yes, Kaliper contains advertisements. An in-app purchase is available to remove ads and unlock additional features.

### What lock systems are included in the free version of Kaliper?

The free version of Kaliper includes two predefined systems: Arrow .014" and Schlage .015" (5 pin only).

### How accurate is Kaliper for measuring key cuts?

Accuracy depends on proper alignment and practice. The app provides zoom controls and detailed instructions to help users achieve precise measurements for decoding keys.

### What devices is Kaliper compatible with?

Kaliper is compatible with iPhones and iPods, with specific model compatibility listed for various screen sizes including iPhone SE, 12, 13, 14, and 15 series, as well as Pro and Max variants.

### Can I add custom key systems to Kaliper?

Yes, Kaliper allows for custom key measurements. You can input distances between cuts, shallowest depth, and depth increments, or select systems from the provided Charts page.

### How often is Kaliper updated?

The latest version is 1.4, last updated on March 16, 2026. Update frequency can vary, but the app is actively maintained.

### What is the age rating for Kaliper?

Kaliper has an age rating of 4+, making it suitable for a wide range of users.

### How do I learn to use Kaliper effectively?

The app has a learning curve, and practice is recommended. Detailed instructions are provided within the app for using both predefined and custom measurement systems.

## Version history (last 5 releases)

### 1.4 — 2026-03-16

-Major overhaul replacing many of the much older iPhones with the current lineup including the last five or more years

### 1.3 — 2022-03-05

---Note: This update requires a minimum version of iOS 14.0---

-Added compatibility for the iPhone 13 lineup

### 1.2.1 — 2021-05-04

---Note: This update requires a minimum version of iOS 12.0---

-Added support for App Tracking Transparency. This only applies to the free version due to ads.

### 1.2 — 2021-01-28

-Added compatibility for the iPhone 12 lineup
-Minor improvements

### 1.1 — 2020-06-28

-Added Lockwood .015" to the custom charts

-Under the hood service to maintain a healthy running app

## Apps similar to Kaliper

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Triton PLUS™](https://appshunter.io/ios/app/triton-plus/id6448079864) | 5.0 (5) | Free | Utilities |
| [Maverick Key Cutting Machine](https://appshunter.io/ios/app/maverick-key-cutting-machine/id6748011881) | — | Free | Utilities |
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## More apps by Farren Domenici

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- [Master It](https://appshunter.io/ios/app/master-it/id645920825)
- [Biaxial](https://appshunter.io/ios/app/biaxial/id658649763)
- [Dialnostics](https://appshunter.io/ios/app/dialnostics/id662583874)

All apps by Farren Domenici: https://appshunter.io/developer/583666476

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*