The best, most powerful, comprehensive, easy to use time keeping app on the Apple Store is now even better. Time Master has the highest average rating of all the time management apps. And the other apps don’t come close to our new optional billing module. Our invoices are totally professional.

Our biggest fans are consultants, attorneys and contractors. Time Master is used by individuals working independently, to attorneys from some of the biggest law firms in the USA. If you need to keep track of time and expenses, you can’t find a better app than Time Master. We at On-Core are IT professionals, so we have firsthand experience with billing and keeping track of time. We know from personal experience what is needed and have made this app so flexible, it works for virtually anyone in any industry in which time needs to be kept.

- Track time by start, stop and/or by duration
- Sessions option can track "punch-in & out" for a single time entry
- Single or multiple running timers
- Timers keep running even if you are not running the app
- Time Entries are by Client and can be sub-categorized by Project and Tasks
- Powerful billing rates that can be defined in the following priority: Global, by Client, by Project, by Task or Custom per entry
- Powerful Time Rounding: by hour, minutes and/or seconds
- Multiple Filters to sort and view only what you need to see
- Define the day of the week that your work week starts
- Track Expenses - from Mileage to Meals to Burning CD's and anything else you want to define
- Display Reports right on your device that you can view and export via email in HTML and/or CSV format. By Client or Timesheet
- Copy Client information from your Contacts list
- Dual taxes for countries such as Canada
- Import IIF files
- Full Backup & Restore capabilities
- and so much more!

OPTIONAL MODULES (one-time additional fee required as an "In App Purchase"):
- Invoicing: If you want to do billing directly from your iPhone or iPod Touch then look no further. The most powerful invoicing module built directly into Time Master. Professional PDF invoices can be emailed to the client, including your own logo.
- Quickbooks Export: Easily export your Time Entries with a QB IIF file. Win QB 2007 Pro or greater. Mac QB 2010+ with our TimeBridge app (fee applies). See site before purchase.
- Synchronization: Wirelessly synchronize two or more devices. If you have an iPad and an iPhone and want to keep the data synchronized between the two devices, this is for you!

Time Master can track both time and expenses. You can track time using start and stop times, duration, and/or timers. All time entries are tracked for a single day, so time entries cannot be greater than 24 hours. It will allow you to time across days, for example if you start a job at 8 p.m. and finish at 2 a.m., it will have a duration of 6 hours.

Expenses can be setup for recurring fixed cost items, such as burning a CD, reimbursement of hardware items, or fluid things such as toll expenses, automobile mileage, etc.

Quick reporting can be done on the iPhone / iPod Touch with the Reports function. The report can be emailed in an HTML and/or CSV format.

Adding new Clients, Projects, Tasks and Expenditures is super easy.  You can create them on the fly without having to navigate to a separate maintenance screen. To edit them you can tap on Setup, do you edit and then return to where you left off in Time Entries or Expenses. By selecting a Project or Task first will automatically fill in the Client field for quick entry.

We’ve made everything as seamless as possible, as you would expect from a top class iOS application. Please click on the "On-Core website" link below to download the documentation on your computer.

What's New

Version 6.3.6

Fixed issue where not prompting to Mark as Read after Report sent.

Ratings and Reviews

4.2 out of 5
15 Ratings
15 Ratings
why nickname?? ,

Looking for more options

I've been using this app for a number of years. It does have a lot of options available. But I need more granularity in tracking my time. The "sessions" approach is great but if I could just assign a task at stopping a session I wouldn't have to add them in with a spreadsheet. The app does have tasks that can be used for describing a timer, but if I want to track 2 (or more) tasks for the same client (which allows me to track my actual time vs estimated per task), I have to start multiple timers for that one client. Then make sure I start the correct one. Seems like a lot of extra work when the ability to assign tasks is already built into the app. It just isn't implemented in a way that is super useful. I haven't found anything else that does this either to be fair

PS Lawyer ,

Great Billing App for Attorneys

As an attorney I have some clients with several different matters. This separates them easily and keeps an ongoing total of billable hours for the month. It is simple to use and can break down time into 6 minute intervals (although it does not use the .1 denomination, which would be preferable. I would love even more if this were made an option). Great for keeping accurate billing on the fly so that nothing slips through the cracks. I have tried several other billing programs and this is by far the best for the legal profession.

RangeWookie ,

Uniquely positioned

Used this app for years, never let me down. You get into a groove when you’re billing multiple clients. I’ve literally downloaded and tried 15 other apps, none of them have this level of flexibility.

Only thing that could use improvement is the receipt tool. I upload PDFs from a different scanning app whenever possible because manually cropping images in time master isn’t great.


On-Core Software LLC
79.6 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, Finnish, German, Norwegian Bokmål, Spanish
Age Rating
Rated 4+
© 2009-2018 On-Core Software LLC
In-App Purchases
  1. Invoicing Upgrade $9.99
  2. Synchronization Module $6.99
  3. Quickbooks Export $5.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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