Certify has bought real-time expense reporting and management platform developer Abacus for an undisclosed sum.

Expense management software provider Certify has acquired Abacus, the US-based developer of a real-time expense reporting system, for an undisclosed amount enabling internet technology group Alphabet to exit.

Founded in 2013, Abacus has created a software platform where business expenses can be reported and reconciled in real time, and which it claims is capable of separating possibly erroneous or fraudulent bills.

The company had raised $3.5m in a 2014 seed round featuring Google Ventures, the Alphabet unit now known…