Rillet, a US start-up that makes accounting software with built-in AI agents, has opened an office in central London. It is the company’s first major move into Europe, Rillet said on Monday.

Customers in the UK and the rest of Europe already account for 15% of Rillet’s new annual recurring revenue, the company said. They include AI image firm Black Forest Labs and software company Temporal.

Rillet makes ERP software, the systems companies use to run their finances. It says its product keeps a company’s accounts up to date in real time. It also lets AI agents do some of the work of closing the books at the end of each month.

UK firms started using Rillet before it had any staff in the country, the company said.…