Have an enquiry? Please get in touch with us on 01423 330335

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:


Project Manager Dashboard

Improvements to Holiday Manager

Improvements to Invoice Manager

Embedded Alert Manager

Improved Excel Reporting

Mileage Rate Maintenance


Fixed Fee Invoicing

Improvements to Sage 200 Link

Xero/Quickbooks Integration

Integration with Outlook



Multi-Client Invoicing