Klaviyo vs Promi

Klaviyo

The default marketing stack for Shopify-scale e-commerce because its data model is built around customer events rather than lists, so predictive fields and AI-built segments actually have something to work with. The free tier is a sandbox, the real cost climbs with active profiles, and once SMS, Composer usage and service modules are switched on the invoice has several meters, not one.

Pros

• +Pricing by active profiles with a real free tier (250 profiles, 500 sends) and no card
• +Predictive churn, lifetime value and next-order date per profile built in
• +Composer builds and audits flows and campaigns from natural-language prompts
• +Public REST API with maintained SDKs in Python, PHP, Ruby and more
• +Email, SMS/MMS, push and a helpdesk module share one customer profile

Cons

• −Costs step up with every active-profile band; the $20 entry price covers only 251–500 profiles
• −SMS, Composer usage and support packages are separate meters on top of the plan
• −The pricing page shows the entry bands and leaves larger bands to a calculator
• −The platform has widened into service and analytics, adding modules a small brand will not use

Promi

Most stores run one coupon for everyone and eat the margin on shoppers who would have converted anyway; Promi's whole argument is that the discount should vary by visitor. Targeting rules and built-in A/B measurement make that testable rather than a leap of faith. The pricing is the complication: a revenue-banded subscription plus a percentage of attributed revenue means the bill moves with your success.

Pros

• +Discount depth varies per shopper rather than one code for the whole site
• +Targeting rules can exclude paid traffic or treat members separately
• +Impact is measured by a built-in A/B test rather than before-and-after guesswork
• +Offers can be shown as strikethroughs, pop-ups or email, not just one surface

Cons

• −No free tier; the cheapest entry is $99 a month plus a revenue overage
• −Percentage overage on attributed revenue makes the real monthly bill variable
• −Uplift figures such as +24% revenue per visitor are vendor-reported averages with no methodology
• −The company publishes no address or country, only a founders@ email

Is Klaviyo cheaper than Promi?

On published entry prices, Klaviyo starts lower — $20/mo against $99/mo for Promi. Entry price is the lowest paid plan as we last verified it; what each plan includes differs.

Does Klaviyo or Promi have a free tier?

Klaviyo has a free tier; Promi has paid plans only.

Which has a public API, Klaviyo or Promi?

Klaviyo ships a public API, as of our last verification. A public API for Promi is not confirmed by us — check its developer docs before you plan an integration.