Klaviyo has free-tier options. The free plan is the right entry point if you're testing the product before committing.
Free
Free
1 seat included
Up to 250 contacts · 500 email sends/mo · all features unlocked · Klaviyo branding on emails
Enterprise
Free
Custom · 100k+ contacts · dedicated CSM · dedicated IP · SSO · advanced security · custom data residency
Once you hit the free-tier ceiling — usage caps, branding requirements, or feature gates — you'll need to move to a paid tier. See the full Klaviyo pricing.