Master It

Master It

On-The-Fly Master Keying App

18 ratings
21 reviews
$6.99

Details

  • Released
  • Updated
  • May 24, 2013
  • March 15, 2026

Features

Master It video #1 for iPhone
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About

Instantly create and print master key systems without complex calculations. Supports various keyways and pin systems, with options for randomization and secure saving. Ideal for on-the-fly key management.

Instant master key system creation
Zero math required
Supports multiple keyways
Randomize TMK generation
Print, email, or save systems
5 or 6 pin system support
Shake to lock/unlock functions
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What's New in Master It

1.7.1

March 15, 2026

-Under the hood repairs

User reviews

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.
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Useful for small, quick jobs.

I found this app to be great for small and quick jobs but I’m not sure what the point of the Save/Load feature is. I can’t seem to find anyway to load previous projects. It only seems to load the last one worked on. It would be perfect if I could save and re-load multiple jobs.

Can multiple jobs be saved and accessed??

Over all I love the app but would like to scroll though and find other jobs
Without printing them.

Need support

Can’t figure out how to enter a sub master under tmk. Can’t find email for support.

Response from developer

Hello! The sub-master and change keys are all automatically generated from the TMK. Support website is found within the app (info icon). Click on the same info icon on the website for contact information (phil@locksmithapps.com). For further help feel free to shoot me an email. Thank you!

Not what I expected and could not get a refund

This App was not what I expected from the description. I assumed that you could choose your own Sub numbers and nowhere does it say you cannot. I also thought that I could pick my own bank of 64 keys, not forced to take his that seem to always start with a 3 cut. You should be able to input any of the numbers yourself. This is nothing I can’t easily figure out by myself at a IMHO, highly inflated price. $5 for this. I would have given it 5 stars if it were $1.99. I was not allowed a refund for purchasing what I thought was something more which really ticked me off. Love your other Apps and I will give them 5 stars. This one is simply not worth $5!

Update: You are right. Based on what the App does it is a 5 star App. That being said stars must be deducted for not being more transparent on what the App does and does not do. It to me looks like you can input your own numbers for sub and possibly pick which cuts you want. As a developer, that is why on a $5 App I will always give a 2 day or so trial. You simply can’t say “Well it’s only $5 so screw you.” It’s the difference of perceived functioning of the App and actual functionality. Maybe this has compelled me to make my own App with all functionality built in. Who knows 🤷‍♂️. I will however up my stars to 3 stars for the quality of the App if I wanted it that way. 🙂

Further Update:
Because of the openness and honesty of the developer and realizing the usefulness of the App and the time taken to make it quick and good looking and functional, I am upping my rating to 5 stars and endorsing it. The developer is very good, his other Apps are great for me and well worth the money. I will be buying all of your Apps. Keep up the good work, it is now agreed they are worth what you charge. Keep up the good work and maybe work in some of the other things. 😉
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Response from developer

I'm sorry to hear this didn't meet your expectations. I'm also surprised to hear that the price for a copied key separates a 1 star from a 5 star rating. Like any tool, Master It saves time by instantly generating a 64 change key system. Open the app, tap Randomize, select your change keys, and AirPrint or Email to yourself. I'm a locksmith myself and have created many systems by hand, and like anything else, it still takes time. In fact the bulk of my apps are tools built to save time. Master It was created for small systems and the cost is paid for the first time it's used, but certainly does not replace your expensive enterprise desktop software. I'm happy to hear you enjoy my other apps, and despite the 3 dollar difference you do not agree with I hope you eventually find this app just as useful. Update: I appreciate the change in rating. I'm not trying to screw you or anyone over. I've put a lot of work into Master It as well as my other apps, and I feel their prices are justified for what they accomplish and to keep my store alive. Keep in mind I have zero control over refunds. I don't even see refund requests. What I do have control over is making changes and thus will heed your words and remove any ambiguity I missed in the description. Should you need anything please feel free to reach me via email. Thank you :) Update 2: I really appreciate this thank you. Keep an eye out for updates and more things to come :)

Developer apps

FAQ

How does Master It create master key systems?

Master It generates master key systems instantly without requiring manual calculations. It can create a complete system with one TMK, one sub-master, and up to 64 change keys, ensuring no cross-keying issues.

What keyways does Master It support?

Master It currently supports a variety of keyways including Kwikset .023", Corbin Russwin .028", Weiser/Falcon .018", Ilco-Unican .018", Schlage .015", Arrow .014", Sargent .0125" & .020", and Corbin .014".

Can I save my master key systems with Master It?

Yes, Master It allows you to save and reload one project at a time. You can also email systems as a backup or for non-AirPrint compatible printers.

What are the randomization options in Master It?

The randomize feature in Master It generates a completely random TMK each time. You can use filters to restrict the TMK to shallow depths or ensure the inclusion of the shallowest and deepest cuts.

What devices is Master It compatible with?

Master It is compatible with all iPhone, iPad, and iPod Touch types and generations running a minimum of iOS version 12.0.

How often is Master It updated?

The app was last updated on March 15, 2026, indicating a recent update. Users can contact the developer via email for bug reports or suggestions.

What is the age rating for Master It?

Master It has an age rating of 4+, making it suitable for a wide range of users. The app is designed for professional use in creating key systems.

How does the 'shake to lock' feature work in Master It?

Shaking your device locks the primary functions on the main screen to prevent accidental changes, such as tapping 'Reset'. Shake again to unlock these functions.