Timesheet & Expense Software for Professional Services
Track time with zero guesswork using timesheet software → reclaim lost billable hours, cut admin by 40% in less than 6 months.

Trusted by 600+ professional service firms including members of the Big Four.
Trusted Time Tracking & Project Management Software for
Accountants
Coretime provides time tracking and timesheets for accountants, giving accounting firms full visibility over chargeable time, client work, and WIP. Improve time recovery, streamline billing cycles, and stay compliant with regulatory demands.
Agricultural Consultants
Coretime provides time tracking software for agricultural consultants, helping teams track projects seamlessly from the tractor to the auction house or while surveying land.
Archaeologists
Whether you’re documenting excavations, managing grants, or balancing academic and commercial projects, Coretime provides time tracking software for archaeologists, streamlining time tracking, reporting, and resource planning.
Architects
Coretime supports a wide range of architectural specialties, including residential, commercial, industrial, and landscape architecture, with RIBA‑aligned timesheet and expense software for architects.
Engineering Consultants
Coretime provides engineering timesheet software for consultancies, helping track billable hours, manage WIP, and keep projects on scope and budget.
Environmental Consultants
Coretime helps environmental consultants track time and expenses, capture CO₂ data, support sustainability reporting, and keep projects on schedule and within budget.
IT Consultants
Coretime helps IT consultants track billable hours and manage expenses, giving teams full visibility into projects, resource allocation, and client billing to stay ahead in a competitive industry.
Management Consultants
Coretime provides timesheet and expense software for management consultancies, helping teams track billable hours, manage WIP, and focus on the tasks that really matter.
Marketing and PR Consultants
Marketing timesheet software from Coretime lets teams track campaigns, log billable hours, and streamline project and resource management.
Not-for-Profit
Coretime helps non-profits track time, manage projects, and streamline collaboration with volunteers, donors, and partners. Enjoy a 15% discount for charitable organisations.
What does Coretime do?
Tired of inaccurate timesheets, missed billable hours, or slow invoicing?
Coretime is a professional time tracking and project management software that simplifies timesheets, expense tracking, and client billing for consultants, accountants, architects, and service teams. Capture every billable hour, automate invoice generation, and gain real‑time visibility into project profitability, helping your team deliver projects faster and get paid on time.
What makes Coretime different?
What makes Coretime different?
You'll Be in Good Company
From consultants to engineers, teams across the UK, Ireland, Australia, New Zealand, Saudi Arabia and the UAE use Coretime to stay organised, save time and simplify project tracking.
GWP Engineering Consultants
Coretime are a real business partner, I find them very helpful, and if I have any questions or queries the support team is there to help me instantly. In short, we’re delighted.

Amanda Godwin
GWP Engineering Consultants
R.G. Parkins & Partners
The Coretime system is easy to use, accurate, and has helped to increase our efficiencies, we would absolutely recommend it to other companies in that we find it invaluable.

David Heron
R.G. Parkins & Partners
Caulmert
With staff based at different office locations and sometimes different parts of the world, having Coretime has brought us all together using one easily accessible web based system.

Donna Milne
Caulmert
Deaton Lysaght
Coretime is simply the easiest, yet the most economically advantageous programme that does so much more than just time management. The overall impact of Coretime has improved both productivity and efficiency.
Elizabeth Churchard
Deaton Lysaght
JNP Group
Coretime is one of the most important packages within the business and is based on an annual subscription with full cloud access. This is a truly fantastic system and very affordable for a company of our size, it’s a fraction of the cost of some systems such as Autodesk and Microsoft.

Jamie Seabrook
JNP Group
AJA Architects
For us, the main benefit is that our system is now more user-friendly in terms of project managers being able to access information, such as seeing how a project is performing against budget. They can analyse how time is being spent and what proportion of it is earning fees – it’s easy to translate.

Matt Simpson
AJA Architects
Wildfowl & Wetlands Trust
It’s cut the time spent on routine administrative tasks and enabled us to be more efficient, which means we can focus more on the actual projects. We can have around 20 live projects on the go at any one time and if a client wants a breakdown of where the time is going, we need to respond almost instantly.

Monica
Wildfowl & Wetlands Trust
Aircraft Leasing & Management
We have recently purchased Coretime through Onesys and were impressed with their responsiveness to our original enquiry and to our subsequent questions. The process for understanding what the software could do for us was efficient and straightforward, as was the administration involved in setting-up the account and finalising the agreement.

Nicola Plummer
Aircraft Leasing & Management
Callisto Consulting
Since purchasing Coretime our time spent on administrative tasks, especially around invoicing has greatly reduced. We can also now respond to Client queries much more efficiently and with a more accurate, trusted response.
Overall the processes that we undertake using Coretime are much quicker and simpler and along with the benefits we’re now receiving in how we can report on our Project data using different parameters, we expect to see a return on investment within a year based on administration time saved.

Paul Bunyan
Callisto Consulting
Pete Stead – P+HS Architects
A huge positive for us is the reduction of double entry of information, not having to manipulate information and enter it somewhere else has made such a drastic difference to how we run our business, we can’t imagine not having Coretime now!

Pete Stead – P+HS Architects
Optima Systems
Coretime provides an excellent service. Their team keeps us regularly updated, which means we always feel informed, supported, and confident that we’re getting the most out of the system.

Rob Price
Optima Systems
Spark Architects
We will be able to easily track non-billable work such as fee proposals and revisions, track outstanding invoices versus paid, and understand budget versus actuals and profitability at both project level and RIBA stages.
Spark Architects