Comparisons
ShadowLedger and Brex
Not the ones paid outside Brex. Its data is the record of what Brex authorized or paid, so a bill run through Brex bill pay is in it and an ACH debit from another bank account is not. Brex's documentation describes exporting Brex transactions into QuickBooks Online. ShadowLedger reads that ledger directly, so a subscription paid by ACH or invoice shows up the same as one paid by card.
What is Brex good at?
Corporate cards, expense management, and the accounting work that follows them. Brex captures receipts, applies categorization and memos, and exports coded transactions into the accounting system so a month-end close is not a manual re-entry exercise. For companies with distributed teams spending on cards, that is substantial time saved.
Which direction does the Brex accounting sync run?
Outward. Brex's QuickBooks Online documentation , read in August 2026, describes exporting Brex transactions into QuickBooks Online. It also describes expenses on a Brex card flowing into the Xero bank feed, and states plainly that bill sync is one way, with data moving only from Brex into the external accounting platform.
As with any integration of this shape, Brex reads back the account structure it needs to code its own transactions correctly. That is mapping, not discovery. Nothing in the integration walks the transactions already in your ledger looking for recurring vendors.
What does that leave out?
Anything Brex did not pay. Brex bill pay sends ACH, checks, and wires, so a bill run through it is visible to Brex. What is left is spend that took another route: direct debits from a bank account, checks and transfers made from the bank's own portal, and annual invoices paid in some other AP tool. A Brex customer can be reading a complete picture of Brex spend and an incomplete picture of software spend at the same time, with nothing on screen indicating the difference.
This is a property of where the data comes from, not a gap in the product. It would be true of any tool whose input is its own authorization stream, and it is what card-blind spend names.
Where does ShadowLedger fit?
It reads the general ledger, which is the one place every payment lands regardless of how it was made. A connection to QuickBooks Online or Xero that never writes to the books, or a CSV export if you would rather not connect anything, produces a ranked list of possible duplicate vendors, amounts that changed, charges that repeat, and renewals you can see from the charges, each with a dollar figure attached.
Running both is a reasonable arrangement. Keep Brex for the card program, and audit the books separately for what the card program was never going to see.
When should you use Brex instead?
Brex is the right choice, and ShadowLedger is not a replacement for it, when:
- You need to issue cards, set limits, and enforce spending policy. ShadowLedger issues nothing and blocks nothing.
- Expense reports and receipt collection are the actual pain, rather than not knowing what you subscribe to.
- You want banking, treasury, and cards from one provider.
- Your bookkeeping is far enough behind that the ledger is not yet a reliable record of the last few months. A scan of incomplete books returns incomplete findings, and we would rather say so than sell you one.