Operational Accounting Systems Limited (​o-a-sys) supplies and supports business and accounting software to a diverse range of industries both on premise and in the cloud.

Our Software Solutions

Exact Software

Pegasus Software

Construction Software

​Operational Accounting Systems Limited


Operational Accounting Systems Limited (o-a-sys) specialise in helping small and medium sized businesses build software to improve the efficiency of their processes. With a collective 82 years’ experience and an award-winning software portfolio we are able to deliver software solutions to a diverse range of industries.

Our fully accredited consultants have an in-depth knowledge of our product range and we are firm believers in face-to-face communication, to build long term relationships with our customers. In Partnership with our software vendors we can give you the best possible introduction to both Pegasus and Exact solutions, and total peace of mind, now and in the future.

Upcoming Events

Pegasus business and payroll update seminar

Cineworld, Ashford, Thursday 28th February 2019

Productivity in the construction industry

London Golf Club, TN15 7EH, Thursday 2nd May 2019