The best free CRM for small business is rarely the one with the biggest feature grid -- it is the one whose upgrade wall matches your trajectory. This guide compares the real free tiers of HubSpot CRM, Zoho CRM, Freshsales, Bitrix24, and Brevo on contact and user limits, the standout feature each one gives away, and the exact point where every plan forces you to pay, with plan names, billing periods, and as-of June 2026 pricing. It segments the picks by team size and whether your business is pipeline-led or email-led, flags the hidden costs of free (gated automation, branding, switching cost), and closes with a use-case verdict so you choose the tier you will not have to migrate away from.