Coretime is an industry-leading time and project management solution aimed at the Professional Services sector.

It can trace its origins back over 20 years and was one of the first true cloud applications in the project control sector.

Coretime was acquired by Onesys from Sage Group PLC on 2nd June 2020. Before this purchase, the product was known as ‘Sage Coretime’. 

Onesys are one of Sage’s largest and most successful business partners with offices throughout the UK.

Prior to this acquisition, Onesys had successfully supplied and supported many hundreds of Coretime customers over almost 20 years, having been appointed as the first reseller of the software in 2002. 

During that time, the product has evolved and grown into the functionally rich and robust product that you see today. The Onesys Development Team are now building on this platform to grow and improve the product based on customer feedback. 

There are Coretime customers in the UK, Eire and around the world, with deployments ranging from a few users through to hundreds of fee earners in multiple offices. These include clients such as PwC, Deloitte, P&G and Defra. 

Onesys also have a fully accredited and well-resourced team supporting Coretime, including experienced consultants to assist with implementation and training requirements. We now have more than 20 people working in the Coretime division.  

Coretime is entering an exciting new era under Onesys stewardship and we look forward to sharing more details of the journey with you.

You can learn more about Onesys Limited’s portfolio of products and services here.

Coretime Roadmap

At Onesys we are always striving to enhance Coretime and give our customers a competitive advantage. See what is coming soon below:


ActiveX Invoice Settings

No longer a requirement to use Internet Explorer or ActiveX to generate sales invoices and statements. All major browsers are now compatible (including Edge)

Sage 50 Link Improvements

  • Internal Server error that occurred using the embedded version of the link has been fixed
  • Improved the narrative on Sales Invoices
  • Additional options to provide more clarity with Tax codes

New Coretime Reports

  • ​Budget v Actual
  • Job Profitability

New User Interface

New Coretime look and feel. There has been a refresh of the menu bar giving the system a fresh, clean look. 

Invoice Manager (Embedded)

For automated, bulk distribution of PDF invoices. Ideal for Coretime users that want to accelerate the distribution of their Sales Invoices.

This has now been embedded into the Coretime product and enabled in the licence string. Please note there is an additional charge for this module. 


Resource Planner

The Resource Planner is a rough-cut capacity planning tool that is designed to help companies manage forecasted demand based on Projects that are in flight as well as those in the pipeline. This is in addition to the existing Staff Planner tool that offers more detailed scheduling. 

Coretime CRM

Coretime CRM is designed to offer Communication Management, Task Management and Opportunity Management for companies with basic CRM requirements. For companies demanding greater functionality, the Coretime > Sage CRM integration is already available.


This was the most requested item in the Coretime Survey performed in Q3 2020 and will extend existing Coretime Budget functionality to allow Quotes and Estimates to be produced.

Purge Utility

Will allow you to clean up and de-clutter your Coretime data.

Cash VAT Accounting

Sage Business Cloud Accounting Integration


Coretime HR

Coretime HR will add basic Human Resource/Human Capital Management functionality removing the need for some customers to run a separate HR system. 

Fixed Fee Invoicing

Improve the workflow around the production and control of fixed-fee and stage-based invoices.

Multi-client Invoicing

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