Mercury

Mercury Books is double-entry accounting software built directly into Mercury's banking platform, using AI to categorize and reconcile banking, card, invoicing, and bill pay activity the moment it happens so founders get a real-time view of their business without imports, exports, or manual entry. The pitch is aimed at founders who work with a bookkeeper (or handle books themselves) and are tired of waiting weeks after month-end to see where money actually went. The product supports full double-entry accounting with accrual and cash basis reporting built to the standard a bookkeeper or accountant expects , which positions it as a replacement for standalone tools rather than a lightweight summary layer on top of a bank feed. It also plugs into Command, Mercury's built-in AI agent, so customers can ask questions about their finances or take actions like recategorizing transactions in bulk, writing journal entries, or updating their chart of accounts in natural language. This launch matters because Mercury, led by co-founder and CEO Immad Akhund, is extending from business banking into the finance ops stack that startups typically stitch together from separate vendors. With more than 300,000 customers already on the banking side , Books is a direct challenge to incumbent small-business accounting software, betting that owning the transaction data at the source produces cleaner books than any tool importing it after the fact.