Bookkeeping software handles the day-to-day: recording transactions, reconciling bank feeds, tracking invoices and bills, and keeping a clean general ledger. Accounting software adds the layers on top, financial statements, tax compliance, multi-entity consolidation, accrual accounting, and the workflows your CPA actually cares about. Most modern platforms (QuickBooks Online, Xero, Sage Intacct) do both; the cheaper ones (Wave, FreshBooks) lean toward bookkeeping and skip the harder accounting.
The category has been reshaped by three forces in the last five years: bank feed automation killed manual data entry, e-invoicing mandates in the EU and Latin America forced compliance investment, and embedded payroll/payments (Gusto, Stripe) turned standalone accounting into one tab in a broader finance stack. The 'pick QuickBooks because the accountant uses it' default still holds in the US, but Xero has flipped that in Australia, the UK, and New Zealand.
What separates a good tool from a mediocre one isn't features, it's reconciliation friction. The best software auto-matches 90%+ of bank transactions, surfaces only the genuinely ambiguous ones, and lets you close a month in an afternoon instead of three days. Everything else is downstream of that.