Best for growing teams that need unlimited users in the books
Xero matches QuickBooks feature-for-feature in most areas and beats it on one structural point: unlimited users on every plan. Strongest outside the US, where accountant familiarity is at least equal and often better.
Best for US small businesses whose accountant already works in QuickBooks
QuickBooks Online is the default US small-business ledger, and its practical advantage is ubiquity: your accountant already knows it. Feature coverage is comprehensive, though user caps and add-on pricing make the real cost higher than the headline.
Best for sole traders and side businesses that need real books at zero cost
Wave offers genuine double-entry accounting and unlimited invoicing at no cost, funded by payment processing and payroll. The Starter tier is free but no longer includes automatic bank feeds, which is the key limitation to understand.