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Puzzle is the first accounting software built natively for startups, designed to replace the manual categorization of QuickBooks. It leverages direct API integrations with Stripe, Brex, and Mercury to categorize transactions automatically with high accuracy. Its unique feature is the "immutable ledger" combined with a real-time view of your burn rate and runway. Unlike traditional accounting where you wait until the end of the month to see your numbers, Puzzle updates instantly. It also generates a "Data Room" for fundraising automatically, compiling your P&L and balance sheet into a format that VCs expect. For founders who are not accountants, Puzzle offers a "human-readable" interface that highlights anomalies (like a duplicate charge) and suggests fixes, turning accounting from a compliance chore into a strategic dashboard.