Rillet

Accounting has always been the quiet engine room of business. The numbers close the month, the reports tell the story, and somewhere between spreadsheets, reconciliations, and late nights, finance teams keep the entire company honest. In San Francisco, Nicolas Kopp and Stelios Modes looked at that engine room in 2021 and saw something outdated. The companies of today move at machine speed, yet the systems tracking their financial truth still crawl through processes designed decades ago. Rillet was built to change that tempo, stepping directly into the evolving world of SaaS finance infrastructure where speed and intelligence are no longer optional.

Rillet’s answer is an AI native ERP built from the ledger up, not layered onto an old database that still thinks spreadsheets are a personality trait. The platform automates the heavy lift inside the general ledger itself. Bookkeeping, reconciliations, consolidations, revenue recognition, and GAAP reporting all flow through one system designed for companies running multi entity and multi currency operations across borders and products. In a SaaS environment where companies scale globally almost overnight, the finance stack cannot behave like a filing cabinet. It has to behave like an operating system.

The intelligence inside that system shows up through Aura AI, Rillet’s financial copilot. Finance teams can ask direct questions like cash burn this month or where revenue moved and get answers instantly, backed by the live ledger. The same engine automates flux analysis, accruals, prepaid expense booking, and large portions of bank reconciliation. For fast growing SaaS companies where financial visibility often lags operational growth, that kind of automation shifts finance from reactive bookkeeping to strategic command center.

Investors noticed early. Sequoia led the company’s Series A, validating the thesis that the general ledger itself was overdue for reinvention. Then in August 2025 the tempo jumped. Rillet raised $70M in a Series B led by Andreessen Horowitz and ICONIQ, with participation from Sequoia and Oak HC FT. Alex Rampell of Andreessen Horowitz and Seth Pierrepont of ICONIQ joined the board, signaling that the next phase of the company is about scaling infrastructure for the next generation of SaaS operators.

The traction behind that conviction is already visible. Rillet has grown to more than 200 customers and has doubled ARR over a recent stretch measured in weeks, not years. Companies like Postscript, Decagon, Windsurf, and Bitwarden are running financial operations on the platform while accounting firms such as Armanino and Wiss are bringing it into their client ecosystems. That matters because accountants rarely chase novelty. They adopt systems that deliver accuracy under pressure.

The product is also expanding its financial orbit. In March 2026, BILL announced a deep integration with Rillet, creating a real time connection between accounts payable workflows and the AI native ERP layer. Transactions move continuously between the systems, giving finance teams a synchronized view of spending and reporting without the usual reconciliation marathon.

Talk to operators and a pattern emerges. Implementation measured in weeks instead of the year long ERP migrations that haunt conference hallways. Reporting that updates in real time instead of at month end. A general ledger that behaves less like a ledger and more like a living financial narrative.

Rillet is still early in its story, but the signal is already loud. When the system responsible for recording the truth of a business starts thinking alongside the people running it, the close stops being the finish line and starts becoming the starting gun. If finance is the language of business, Rillet is teaching the ledger how to speak in real time.