For years, a finance leader could describe BILL and Brex without using the same sentence. BILL lived near the invoice: capture it, route it, pay it, sync it. Brex lived near the swipe: issue a card, set a limit, collect a receipt, close the books. Then each company followed the money one step farther. And another. The categories that kept them apart began to look like temporary walls.
Today, both can sit between a purchase decision and the general ledger. Both sell cards, spend controls, bill pay and accounting automation. Their menus overlap enough that Brex publishes a page aimed directly at businesses comparing it with BILL. Yet the products arrived at this moment carrying different habits, customer bases and economics. Those differences matter more than a row of green checkmarks.
The useful question is not which company has more features. It is where your company loses context. Does trouble begin when an invoice lands in an inbox? Or when an employee needs permission to spend? The answer tells you which origin story is still hiding inside the software.
BILL bought the card-shaped shortcut
BILL's center of gravity is accounts payable and receivable for small and midsize businesses. It built a network around invoices, suppliers, accountants and payments. In May 2021, then-Bill.com agreed to buy Divvy for roughly $2.5 billion. Divvy combined budgeting and expense software with a corporate card. The acquisition gave BILL a way to move upstream from recording an obligation to governing the spend that creates one.
The logic was plain in the announcement: customers wanted fewer systems and a view of AP, AR and card spend in one place. That same year, BILL said its base exceeded 115,000 customers, while Divvy had more than 7,500 monthly active small-business customers. A distribution machine met a card product.
The card arm is no side project. In fiscal 2025, BILL disclosed 66.4 million Divvy Card transactions, compared with 47.8 million AP/AR transactions. The dollars moved tell the reverse story: $21.5 billion on Divvy Cards versus $279 billion through AP/AR. Cards generate frequent signals. Payables move the heavier sums. Owning both gives BILL a denser picture of business cash flow.
“Our expanded platform will provide more automation and real-time information to SMBs.”René Lacerte, announcing the Divvy deal in 2021
Brex built the invoice-shaped bridge
Brex traveled the other direction. Its early wedge was a corporate card for venture-backed startups. That made the company close to employees, merchants and live spend policy. Bill pay pulled it into the controller's world: invoices, vendors, purchase orders, approval chains, payment rails and reconciliation.
Brex describes its early bill-pay flow as dropping in an invoice, extracting the details, routing approval, paying and syncing the result to accounting software. By 2024 it was talking about PO matching, vendor onboarding, local-currency wires and general-ledger coding. Its product team reported $4 billion in annual processed bill-pay volume and said the roadmap was moving toward procure-to-pay.
This is a strategic bridge, not merely a convenience for card customers. The invoice may never touch a Brex card, but it still carries data about a vendor, a budget and a future cash outflow. Pulling it into the same policy engine lets Brex argue that finance teams can control card and non-card spend with one rulebook.
The overlap is real, but not symmetrical
BILL's disclosed scale comes from a broad network. In its fiscal year ended June 2025, the company counted 169,500 AP/AR customers, 41,100 spending businesses using Spend and Expense, and 283,200 customers in embedded and other channels. Some businesses appeared in more than one category. For the quarter ended March 2026, BILL reported $89 billion in payment volume and $406.6 million in revenue.
BILL's inherited center of gravity
Brex is private inside a bank and publishes fewer comparable financial metrics. Before the acquisition, it said more than 30,000 companies used its platform, and in February 2025 it said its enterprise segment included more than 150 public companies. Those claims describe a customer mix tilted toward startups, global technology companies and larger enterprises. BILL's language keeps returning to the small-business economy and accountant channel.
So the rivalry has an awkward geometry. BILL can use AP distribution to introduce cards and expense controls. Brex can use card relationships to introduce bill pay and accounting workflows. Cross-selling is the prize on both sides, but the door into the customer is different.
Then Capital One changed the wager
Capital One announced its agreement to acquire Brex in January 2026. The deal closed on April 7. Capital One's second-quarter materials recorded purchase consideration of about $4.5 billion, below the $5.15 billion value announced when the agreement was signed. Brex's legal disclosures now describe it as a wholly owned subsidiary of Capital One, N.A.
That changes the frame. Brex can draw on a large bank's underwriting, funding, payments infrastructure and distribution. BILL remains a public financial-software company with its own payment network, bank partners and a balance sheet measured differently. Product decisions that once looked like a contest between two fintech companies now sit inside two distinct institutional models.
Ownership does not choose the software for a controller. It does change the questions worth asking: Will card underwriting evolve? Which integrations remain open? How will deposits, payments and software be bundled? Does a bank parent make the platform more durable, or does it create new concentration concerns? The answers will emerge through product behavior, not acquisition-day promises.
The winner is the platform that removes a handoff without hiding the evidence finance teams need to trust the result.
How to steal the strategy without buying the suite
There is a lesson here for builders outside fintech. Each company started with a painful, frequent event that already carried useful data. BILL had the invoice. Brex had the card transaction. From that event, each expanded into the adjacent decision where context was being lost. The pattern is worth copying: win one recurring workflow, preserve its data, then remove the next handoff.
Finance buyers can steal a second lesson. Evaluate the chain, not the feature. Take a real purchase from request to approval, payment, receipt, ledger and audit. Add an exception. Change a vendor's bank details. Submit a duplicate invoice. Close the month. A platform earns its place when the awkward cases become visible and recoverable, not when the polished demo follows the happy path.
Consolidation has a cost. One platform can reduce logins, exports and contradictory policy. It can also concentrate operational risk and make a later migration harder. Before committing, export your vendor master, approval history and accounting mappings. Test role-based access. Price the platform at today's usage and at twice today's entities, currencies and transactions. Ask what happens to data and cards on the day you leave.
BILL and Brex have spent years telling the same underlying story from opposite ends: finance work is one connected system, even when software categories pretend otherwise. Their convergence gives buyers more capable suites. It also raises the stakes of choosing the system that sits between intent and money movement. The finance desk is getting simpler on the surface and more consequential underneath.
Frequently asked questions
Do BILL and Brex compete directly?
Yes. Both offer cards, expenses, bill pay, approvals and accounting integrations. Their inherited strengths and customer mixes remain different.
Why did BILL buy Divvy?
The acquisition added corporate cards, budgeting and expense controls, extending BILL from invoices and payments into employee spend.
What did Brex add beyond cards?
Brex expanded into expense management, business accounts, travel, bill pay, vendor workflows and accounting automation.
Who owns Brex?
Brex became a wholly owned subsidiary of Capital One, N.A. when the acquisition closed on April 7, 2026.
Which platform should a finance team choose?
Start with the workflow carrying the largest operational cost or control gap, then test the full chain with real exceptions. Product fit depends on that evidence.