Master It 4+

On-The-Fly Master Keying App

Farren Domenici

Designed for iPhone

    • 3.8 • 19 Ratings
    • $5.99

iPhone Screenshots



Create and print master key systems in an instant with Master It.

Master It is perfect for small or on-the-fly systems. Create a master key matrix immediately with zero math and zero worries of cross-keying. Either enter in your own TMK or tap Randomize to create a complete master key system containing a single TMK, a single sub master, and up to 64 change keys. Each output delivers a fixed sub master and set of change keys.

Master It is built to create a system immediately to print and keep in your records at your shop. It is capable of saving and reloading one project at a time. The goal with Master It is to create and AirPrint a system in an instant. If on the road when printing isn't available, email and save features are secondary backups prior to printing. Email is also ideal when a printer is not AirPrint compatible.

Currently supports:

Kwikset .023"
Corbin Russwin .028"
Weiser / Falcon .018"
Ilco-Unican .018"
Schlage .015"
Arrow .014"
Sargent .0125" & .020"
Corbin .014"

Obeys MACS rules for each selected system.

AirPrint, Email, or Save any system created.

Create 5 or 6 pin systems.

Randomize feature to always generate a completely random TMK every time. Use the two filters to restrict the TMK to only shallow depths, or to always include the shallowest and deepest cuts.

Tap anywhere on the matrix to select or deselect a bitting for the key chart.

Shake your iDevice to lock the primary functions on the main screen. This is to prevent unwanted changes (i.e. accidentally tapping Reset). To unlock, just shake again.

All change keys can be individually identified.

Use the Project Name / Keyway box for temporary saving information. The actual printout will allow you to write in the business name, personal name, address, keyway, and phone number conveniently. After printing, the system can be continued manually on paper.

Additionally, you can tap on each change key to display the pinning.

Compatibility: All iPhone, iPad, iPod Touch types and generations with a minimum iOS version of 12.0

Found a bug? Something not working? Have a suggestion? Feel free to contact me via email:

What’s New

Version 1.7

-Added function to quickly select all 64 change keys

-Fixed a minor display issue

Ratings and Reviews

3.8 out of 5
19 Ratings

19 Ratings

Jeff2392 ,

Not a bad app.

So far this app seems like a good app. As far as starting a master system from scratch, very helpful. But, my only complaint is that I wish it allowed you to manually enter key cuts for already exsisting keys. For example: a locksmith is called out to a newly constructed apartment building. The contractors have already installed all the door locks (each having its own key). The manager wants the locksmith to make a master key to all of the already installed locks. Yes it still would require the locksmith to add the master pins to each lock, but the locks already have their own cut keys. Point I’m getting at is, the app right now will not allow you to go in and manually enter each existing key cuts and then be able to give you a quick reference on master pins that need added to each lock. The app only generates key cuts to be made on each new key as well as what master pins to put in. It would be nice if this was updated.

Wushun ,

Noob user!

May be this is a good program. But, I just could not figured out how to use it properly. Wish there was more written information on it. It would be great if you could provide more background information on the use of the Matrix in your web site. I loaded Master It on an iPad and it’s running fine.

Developer Response ,

Please contact me for help before submitting a one-star rating. There is a set of instructions built into the app, but If something isn't clear I am an email away for support. Also, knowing what may not make be clear to you could be implemented into new updates to possibly help others like yourself in the future.

Update: Thank you for adjusting the rating. So long as your iPad's iOS has a minimum version of 7.0 the app will run. If you are able to shoot me an email I can further assist you.

BuMmR ,

Decent App

This looks like a pretty decent app with a bit more of work could be great.

Let me just start by saying great work so far. Things I would really love to see added in.
Key IDs - So like you would have the TMK Then a group master of A, a Base master of AA and then a Page master of AAA

Then you could also add how many changes for the keys. So my base master key would be AA and that would be given to a manager over like a sales department, accounting department, and a business department, then the page master keys would be used for each individual office to give to the people you only wanted in each part.

Also would be nice to know how many changes you had per page master keys. So like page master 1 could have like 31 changes and also would be AAA group.

Would be nice if you could somehow click on these and get the bottom pins and master pins as well.

Developer Response ,

Thank you for the constructive feedback. To answer your last concern first, you can indeed see the pinning of each change key by tapping on the bitting of each respective change key (the second page in the instructions provides more detail). As far as the rest, this app was not built for multi stage key systems, but rather small systems that can be generated in a matter of seconds by simply using the randomize function.

App Privacy

The developer, Farren Domenici, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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