Mercury Books vs QuickBooks (and Poof): An Honest Comparison

Mercury launched Books on September 16, 2026. If you bank with Mercury, it is free until the end of the year and $35 a month after that. QuickBooks Online Plus is $140 a month since Intuit's August price increase, so that number is going to get your attention, and it should. Here is an honest read on what Mercury Books is, how it compares with QuickBooks, and where Poof fits.

What Mercury Books is

Mercury Books is accounting inside the bank account. It is a full double-entry ledger with cash or accrual reporting. Your Mercury banking, card, invoicing, and bill pay activity flows in on its own, and the AI categorizes and reconciles it as it happens, flagging the transactions that need a second look. You can connect external banks and credit cards, and platforms like Stripe, Gusto, and PayPal, so activity outside Mercury can be in the books too. Command, Mercury's AI agent, answers questions about the books and makes bulk changes, with each action confirmed before it is applied. Your accountant gets in free: advisor seats are unlimited.

The catch is the first sentence. Books is a feature of a Mercury business account. If your operating account is somewhere else, using it means opening a Mercury account first.

The pricing is straightforward. Free for Mercury customers through December 31, 2026, then $35 a month.

Mercury Books vs QuickBooks

Pick Mercury Books if you already bank with Mercury, your books are a P&L and a balance sheet with no inventory or project tracking, and your accountant is happy to work in a new tool. It is a quarter of the price of QuickBooks Plus and removes a login.

Pick QuickBooks if you don't bank with Mercury and don't want to move, you need inventory, classes, or project tracking, you depend on apps that integrate with it, or your CPA works only in QuickBooks. For the reasons the price keeps rising, see why QuickBooks is so expensive.

Where Poof fits

Poof is the third option: accounting that is not tied to a bank, with the back office around it. Three differences matter.

Bank anywhere. Poof connects any bank and card through Plaid and imports statements as CSV or PDF for anything older than the sync window. You don't move your banking to get the books.

More of the back office. Both handle invoicing. Poof adds automated follow-ups on what is owed, budgets against actuals, a twelve-month cash forecast, and profit per job. Mercury's launch materials do not list forecasting or job profitability.

Every entry waits for a person. Mercury describes Books as categorizing and reconciling transactions as they happen and surfacing the ones that need a second look. In Poof, every entry the AI proposes stages as a card with the evidence it found: the five prior transactions for that merchant, the customer it resolved, the amount, the account. You approve it, approve part of it, or reject it with a reason that is recorded. When you have approved the same kind of work a few times, you grant a rule from the card in front of you, and that rule stops itself the first time you contradict it.

For a solo founder that may be more review than they want. For anyone who has had to explain a number to a lender, an auditor, or a partner, it is the difference between books that were done and books you can defend.

All three side by side

Mercury's terms checked October 6, 2026. QuickBooks prices as of Intuit's August 1, 2026 increase. Both can change; verify before you decide.

What I would do

If you bank with Mercury and your books are simple, use Mercury Books through December and see if you miss anything. You will know by February.

If you are on QuickBooks Simple Start or Essentials and it does what you need, the price increase alone is not a reason to move. If you are on Plus for one feature, check whether you still use it.

If you bank somewhere other than Mercury and don't want to move, need to know whether a job made money, or want every AI entry in front of you before it posts, the free months are not the number that matters. The number that matters is what a wrong entry costs you at tax time, and whether you would have seen it before it posted.

For a broader look at the field, see the best QuickBooks alternatives for small business. For how Poof's approvals inbox works in practice, the homepage is a working demo.

*Correction, October 6, 2026: an earlier version of this post said Mercury Books only reads Mercury accounts and has no invoicing. Both were wrong. Mercury Books connects external banks, cards, and platforms, and it includes Mercury's invoicing and bill pay. We have rewritten the comparison.*

*Written by Austin Semple, a former controller: three years in audit, seven running the books for small businesses, and the founder of Poof. Poof is one plan at $79/mo with every feature included, and a close within five business days or the next month is free. Start a 30-day trial, no card required.*