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


​o-a-sys specialise in helping small and medium sized businesses bring their processes and people together to improve efficiency. 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. 

o-a-sys are leading software partners, with out dedication and hard work being recognised by software vendors who have awarded the team with centre of excellence accreditation's. This status is only awarded to a selection of software partners and is reviewed on an annual basis to ensure high standards are maintained.

We are also accredited developers, allowing our in-house development team to tailor the software to your more detailed requirements. 

Upcoming Events

IT Showcase Exhibition

Emirates Stadium, London, Tuesday 16th October

Customer Christmas Event

Howfield Manor Hotel, CT4 7HQ, Friday 7th December