Iterable vs Klaviyo: a price you have to request against one you can read

Klaviyo's published ladder

These are the Email plan steps shown on Klaviyo's pricing calculator on 7 October 2026. The third column is the monthly emails each tier includes, and the fourth divides the price by 1,000 profiles to show how the rate moves.

The rate per profile falls until 10,000 and then ticks up at 25,000, where a profile costs $16 against $15. Source: klaviyo.com/pricing. The page's Email and SMS selector did not render when read, so SMS plan prices are not included here. The free plan also lists $5 of mobile messages a month and $5 of Composer usage.

What a 12-month Klaviyo bill looks like

A SaaS with 10,000 users in lifecycle messaging pays $150 x 12 = $1,800 a year on the Email plan, with room for up to 100,000 emails a month, which is ten per profile. At 25,000 profiles the figure is $400 x 12 = $4,800 for up to 250,000 emails. At 2,500 profiles it is $720. The tiers are labelled by active profiles, so ask how Klaviyo defines active: that definition decides when a growing list tips you into the next step. These are the numbers an Iterable proposal should be held up against, once you have one.

What an Iterable quote has to answer

Iterable's pricing page describes an AI customer engagement platform built for enterprise scale, and its product copy lists campaigns, customer engagement journeys, cross-channel personalization and customer data activation, with SMS among its channels. It lists no tiers. Put these in the request so the quote is comparable to the ladder above:

• The pricing unit: contacts, monthly active users, messages, or a platform fee plus usage.
• What happens above the committed volume, and whether custom events are metered. Iterable's own event guide links to a page on monitoring custom event usage.
• What onboarding covers and what it costs separately.
• Contract term, renewal uplift and what data you can export at exit.

Sending SaaS billing events to each

Klaviyo's Create Event reference says the request must carry at least one profile identifier, an id, email or phone number, and a metric name, and gives rate limits of 350 requests per second burst and 3,500 per minute steady. Its API reference also lists a bulk create events endpoint and a client-side create event endpoint. That is enough to describe a billing integration: your webhook handler receives a failed-payment event from Stripe or Paddle, looks up the user's email, and posts an event under a metric such as Payment Failed, with plan and amount as properties. At 3,500 a minute, 10,000 invoice events in a day average about 7 a minute, so rate limits are not the constraint. Replaying a year of history is, and that is what the bulk endpoint is for.

Iterable's documentation treats events as the actions your users take, usable in segmentation and journeys, and advises tracking milestones rather than every action. It suggests naming events without spaces, so trialEnded works and "trial ended" does not. A billing integration there is also a small set of named events from your backend. The practical difference is that you can read Klaviyo's request format and limits on the public reference today, while Iterable's account-level event allowances come with the contract.

Free plan against demo form

Klaviyo's free plan lets a SaaS with fewer than 250 profiles run real flows with 500 emails a month. That is enough for a private beta and to prove an integration, though one onboarding sequence of five emails to 100 new users would already use all 500. Iterable has no equivalent, so the proof of concept happens inside a sales-led trial or a paid pilot.

Which to choose

• Klaviyo fits startups and growth-stage SaaS from the free plan to about 25,000 profiles, where a visible bill from $30 at 1,000 to $400 at 25,000 is a feature.
• Iterable fits a large product or consumer-app business with an engineering team, multiple channels and a contracting process, which can absorb an unpublished price.
• Neither is the cheapest route for a few lifecycle emails; see the Loops and Customer.io comparisons if transactional volume or a smaller bill is the goal.

Leaving one for the other

1. Export profiles with consent and unsubscribe status, and import suppressed people as suppressed.
2. Recreate your event names in the new system and replay a recent window of history so segments are not empty.
3. Rebuild journeys or flows starting with the trial and payment ones, and run old and new side by side on a test segment.
4. Keep the sending domain's authentication in place until the new platform has sent cleanly for a week.

Related reading: Iterable vs HubSpot, Customer.io vs Klaviyo, Braze vs Klaviyo, Loops vs Klaviyo, Klaviyo vs Brevo and the comparison index.