Comparison

Master It vs One Onsite

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Master It

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.

Highlights
  • 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
Features
Currently charting
Read full description

***FEATURED IN KEYNOTES MAGAZINE*** 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: farren@phoxlocks.com

About

One Onsite

This app assists facilities maintenance technicians in completing work orders efficiently. It provides detailed information, guides users to locations, and streamlines data collection for back-office reporting. The application is designed for ease of use with minimal training required.

Highlights
  • View daily work orders
  • Access issue and location details
  • Review historical service information
  • Guided task completion flow
  • Offline and low-connectivity performance
  • Faster data upload
  • Battery optimization
Features
Read full description

One Onsite by Lessen helps vendors and their technicians complete their facilities maintenance work orders successfully while collecting valuable information along the way. With One Onsite, technicians can see the work they need to do for the day, read through relevant information around the issue, location and historical work done while effectively executing their work on-site with minimal disruption. Some of the key features around this app include: · Guided – With its seamless flow, simple language and focus on one task at a time, One Onsite is simple for the technicians to understand, and they require minimal training to use the app · Informational – One Onsite provides information and photos around the work order, guides the technician to the location that they need to visit and provides relevant historical service information. It also helps the technicians understand what information needs to be provided to their back office based on the trade · Efficient – One Onsite boasts of a vastly improved tech stack from its predecessor with better performance in offline and low connectivity areas, faster upload times and greater battery optimization

Screenshots

Master It4 screens
One Onsite4 screens

Verdict

The call

The clearest difference is review sentiment: Master It at 76% against One Onsite's 23%. Master It also leads on rating (3.7 vs 2.5) and chart position (#178 vs unranked). One Onsite's advantage is price (Free vs $6.99) and ratings volume (98 vs 18). On update cadence, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

One Onsite is free to download; Master It costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Master It holds the better App Store score, 3.7 against 2.5. That said, the two scores are not equally well evidenced: One Onsite has 98 ratings behind it against 18, so its average is the more settled of the two. Written reviews point the same way: 76% of Master It's written reviews are positive against 23% of One Onsite's.

UpkeepUpdate frequency

Master It ships an update every 2 months, One Onsite every 5 weeks. The most recent releases landed on September 30, 2026 and October 5, 2026 respectively.

Scorecard7 real differences · 4 level
Master It versus One Onsite: the parameters behind the verdict, then further details
ParameterMaster ItOne Onsite
Price$6.99Free — better
Rating3.7 (18 ratings) — better2.5 (98 ratings)
Positive reviews76.2% of reviews — better23.1% of reviews
Number of ratings1898 — better
Update frequencyEvery 2 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank#178 — better—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS12.0 — better15.0
Further details — not scored
Size6 MB117 MB
Age rating4+4+
DeveloperFarren DomeniciSMS Assist, LLC.

Customer experience

Master It

All ratings18 ratings
Positive61.1%
Neutral22.2%
Negative16.7%
Written reviews21 reviews
Positive76.2%
Neutral14.3%
Negative9.5%

One Onsite

All ratings98 ratings
Positive34.7%
Neutral5.1%
Negative60.2%
Written reviews26 reviews
Positive23.1%
Neutral3.8%
Negative73.1%

In-app purchases

None

Master It

No in-app purchases

None

One Onsite

No in-app purchases

Questions

Is Master It free?
Master It costs $6.99, with no in-app purchases.
Is One Onsite free?
One Onsite is free to download, with no in-app purchases.
Which has better reviews, Master It or One Onsite?
Master It is rated higher. Master It averages 3.7 out of 5 from 18 ratings, while One Onsite averages 2.5 from 98 ratings.
Do Master It or One Onsite have ads?
Neither Master It nor One Onsite shows ads.
Which is updated more often, Master It or One Onsite?
Master It ships an update every 2 months, and One Onsite every 5 weeks. Most recently, Master It was updated on September 30, 2026 and One Onsite on October 5, 2026.

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