Rillet: The AI-Native ERP Reinventing Accounting for SaaS Companies

Accounting software hasn’t changed much in decades. While nearly every other business function has been reshaped by modern, intuitive software, finance teams are often still stuck with clunky enterprise resource planning (ERP) systems built for a different era. Rillet, a fast-growing startup, is on a mission to change that — building an AI-native general ledger and ERP designed specifically for how modern SaaS and subscription businesses actually operate.

What Is Rillet?

Rillet is a cloud-based, AI-native ERP platform focused on core accounting operations: general ledger, month-end close, accounts receivable and payable, revenue recognition, and financial reporting. Unlike legacy systems that had AI features bolted on after the fact, Rillet was built from the ground up around automation and real-time data, with the explicit goal of enabling a “zero-day close” — continuously updated books instead of a long, manual, end-of-period scramble.

The platform is delivered entirely through the browser, with no local installation required, and covers:

Customer invoicing and accounts receivable
GAAP-compliant revenue recognition, including ASC 606 allocations
Automated bank reconciliations
Accounts payable and spend tracking
Real-time SaaS metrics (ARR, net revenue retention, cash burn, and more)
Multi-entity, multi-currency, and multi-geography consolidation
Select international tax workflows, including Canadian GST/HST

It’s worth noting that Rillet is a financials-first platform rather than a full end-to-end ERP. It has no built-in inventory, order management, or manufacturing capability — for companies that need those modules, Rillet reportedly partners with operations-focused platforms rather than building that functionality itself.

The Founders’ Story

Rillet was founded in 2021 in New York by Nicolas Kopp and Stelios Modes, two former N26 executives who experienced the pain of outdated finance systems firsthand. Kopp, who served as U.S. CEO of the neobank N26, has described how frustrating it was to wait weeks for basic business metrics, even with a world-class finance team, simply because the underlying systems were outdated. Modes, who built N26’s payment infrastructure, brought the technical expertise needed to rebuild enterprise accounting from scratch.

That shared frustration turned into a shared mission: build the ERP they wished they’d had — one where finance leaders could scale multi-billion-dollar businesses with lean teams instead of large back-office headcount.

Aura: Rillet’s AI Layer

A centerpiece of Rillet’s product is Aura, its AI assistant and agent layer, which has expanded significantly through 2025 and 2026:

Aura Chat lets finance teams ask natural-language questions directly against the live general ledger — things like “Why was ARR lower this quarter?” or “Who are my top customers by revenue?” — and get answers grounded in current data rather than a stale export.
Embedded agents handle specific accounting workflows: a flux agent compares actuals to the prior period and drafts commentary automatically at month-end, while other agents propose accruals, reconcile cash, chase AR collections, and code AP transactions.
Aura Flow allows anyone on the finance team to build multi-step workflows in plain English, such as generating a board summary, a 13-week cash forecast, or an AR aging report.
Aura Command Center, rolled out in 2026, brings these agents together with an emphasis on transparency: every AI-proposed action follows a propose-and-approve model with a full audit trail, which is aimed squarely at larger, more regulated customers that need clear governance over AI-assisted accounting.

Rillet has paired this AI push with a “Rillet Vibe Academy,” a training initiative to help finance professionals build AI and workflow-automation skills — both an education play and a funnel for product adoption.

Integrations

Rillet’s philosophy is that AI automation is only as good as the data flowing into it, so the company has invested in deep, purpose-built connectors rather than a broad, shallow marketplace. Native integrations include:

Billing: Stripe, Chargebee, Maxio, Orb
AP and spend: Ramp, Brex, BILL
Payroll: Rippling, Gusto, Justworks
CRM: Salesforce, HubSpot (with real-time sync — a closed-won deal in HubSpot or Salesforce can appear in Rillet within roughly 30 minutes)
Banking: Plaid

The Chargebee integration, added in 2026, lets journal entries from Chargebee’s billing and revenue-recognition engine flow directly into Rillet’s general ledger, reducing manual reconciliation and feeding real-time SaaS metrics like ARR waterfalls and net burn.

Funding and Growth

Rillet’s rise has been remarkably fast. The company raised a $25 million Series A from Sequoia in May 2025, followed just ten weeks later by a $70 million Series B co-led by Andreessen Horowitz and ICONIQ, with continued participation from Sequoia and Oak HC/FT. That brought total funding to roughly $108.5 million in under a year, at a valuation reported to be around $500 million. The company has since gone on to raise over $200 million in total funding, with new board members including a16z General Partner Alex Rampell and ICONIQ General Partner Seth Pierrepont.

In that same early window, Rillet signed more than 200 customers and doubled its annual recurring revenue in just 12 weeks. As of recent reporting, the company employs around 53 people, with teams spread across New York, Barcelona, and Menlo Park.

Built by Accountants, for Accountants

One of Rillet’s standout differentiators is its team composition. The platform was engineered by a team of more than 50 CPAs, many from Big Four accounting firms, alongside operators who previously worked at legacy ERP companies. This blend of deep accounting expertise and modern software engineering shows up in the product — Rillet has earned a Net Promoter Score above 70 and a top rating on G2, both unusually strong signals for enterprise software.

The company has also built partnerships with major accounting and audit firms, including EY, KPMG, RSM, Armanino, and Wiss, further cementing its credibility within the finance industry.

Who Uses Rillet?

Rillet is designed for companies that have outgrown simpler tools like QuickBooks or are frustrated by the complexity and slow deployment timelines of legacy systems like NetSuite or Sage Intacct. Industry coverage points to an ideal customer profile of roughly $5 million to $250 million in revenue, particularly subscription and usage-based businesses on Stripe or Chargebee.

Notable customers include Windsurf and Decagon. Windsurf has publicly described running an approximately $100 million ARR finance operation with a two-person team on Rillet — a concrete example of the “one-person Finance function” vision Rillet has been chasing since its earliest pitch to investors.

Pricing

Rillet does not publish a public price list; pricing is quote-based and, according to the company, is not tied to per-seat fees or a percentage of revenue but instead scales with the features used and the complexity of the business. That said, independent market data gives a rough sense of real-world costs:

Buyer transaction data from software marketplace Vendr put the median annual contract at around $28,250, with observed deals ranging from about $20,100 to $34,800 per year as of mid-2026.
Other independent estimates put a realistic year-one cost, inclusive of implementation, in the $35,000–$60,000 range.
Implementation typically runs 4 to 6 weeks with Rillet’s in-house CPA team, compared with 3 to 6 months or more for a typical single-entity NetSuite deployment.
Some perks programs, such as Mercury’s, have offered discounts and waived implementation fees for eligible startups.

How Rillet Compares to the Competition

Rillet most frequently positions itself against NetSuite, Sage Intacct, and QuickBooks — legacy systems it argues were never designed for subscription revenue models. Independent reviewers generally agree that:

Vs. NetSuite: Rillet tends to win on implementation speed, close automation, modern user experience, and cost for pure-software companies, while NetSuite still wins decisively on breadth — inventory, order management, project accounting, and a mature partner ecosystem.
Vs. Sage Intacct and QuickBooks: Reviewers point to stronger revenue tracking and reporting with Rillet, particularly for complex, multi-element subscription contracts.
Newer AI-native competitors: The category has gotten crowded quickly, with rivals like Campfire, DualEntry, and other AI-native general ledger startups also raising significant funding — a sign that incumbents like NetSuite are taking the threat seriously enough to publish their own comparison pages against Rillet.

Things to Watch Out For

No vendor is a perfect fit for every company, and independent reviews flag a few honest caveats worth knowing before signing a contract:

Young-vendor risk: Rillet doesn’t yet have a decade-long track record or widely evidenced public-company customers, and the AI-native ERP category could still consolidate. Buyers are generally advised to diligence data portability — export formats, contract exit terms, and escrow arrangements.
Scope boundaries: Because Rillet is optimized for digital subscription and usage-based revenue, companies with services, milestone-based, hardware, marketplace, or percentage-of-completion revenue should carefully validate coverage before committing.
Data quality dependency: Automated revenue recognition is only as good as the contract data feeding it. Reviewers note that messy CRM or billing data is the most common source of implementation delays, so engaging auditors before go-live — especially if they haven’t tested against Rillet’s output before — is recommended.
IPO-grade readiness: Companies within a couple of years of a public offering are advised to pressure-test Rillet’s audit and internal-controls maturity closely, as public-company-grade proof points are still limited.

The Bigger Vision: A One-Person Finance Function

Perhaps the most ambitious part of Rillet’s roadmap is its long-term vision: enabling a “one-person Finance function.” By automating the manual, repetitive work that traditionally requires large teams — reconciliations, revenue recognition, invoicing, and reporting — Rillet aims to let lean finance teams operate at a scale that once required dozens of people. The company has framed this shift around a new kind of role it calls the “Finance Engineer,” emphasizing automation and internal tooling over headcount growth.

Looking ahead, Rillet has signaled plans to push further into agentic automation, extending AI-driven workflows deeper into auditing, accruals, and reconciliation — moving finance teams closer to a future where routine accounting work happens automatically and in real time.

Final Thoughts

Rillet represents a broader shift happening across enterprise software: the move away from legacy systems that slow businesses down, toward AI-native platforms built for speed, accuracy, and real-time decision-making. With strong funding, a rapidly growing customer base, a team that deeply understands both accounting and technology, and an increasingly capable AI layer in Aura, Rillet is positioning itself as a serious contender to reshape how modern subscription businesses manage their books.

That said, it’s still a relatively young platform with a deliberately narrow focus — companies with non-subscription revenue streams, heavy operational needs, or public-company compliance requirements should evaluate it carefully. For finance teams tired of waiting weeks to understand their own numbers, though, Rillet’s promise of a zero-day close might be exactly the shift the industry has been waiting for.