Enter your business details to see what each option would cost you. Prices are live from our database and shown in US dollars.
Email is the highest-return channel most online stores have, and for ecommerce the platform choice comes down to three things: how deeply it connects to your store, how good its automation is for cart recovery and post-purchase, and how its price scales as your list grows. The right answer depends on your store's size and how much of your revenue you plan to drive through flows rather than one-off campaigns. Below are our ranked picks, then a live comparison table and calculator to cost each at your list size.
How we chose
For an online store we weighted the depth of store integration first, Shopify and WooCommerce sync and the order data that feeds it, then the quality of pre-built ecommerce automation for abandoned cart, browse abandonment and post-purchase, then segmentation, and finally how the price behaves as your contact list and send volume grow. Pricing is live from our database in US dollars.
What an online store should prioritise
Prioritise automation and store data over campaign send tools, because for ecommerce the money is in the flows. A tool that syncs order and browsing data lets you segment by what people actually bought and browsed, and trigger recovery and post-purchase emails on real events, which is where Klaviyo and Omnisend pull ahead. Then look hard at how each one prices, because the billing model, per contact, per active profile, or per email sent, decides which is cheapest for your particular mix of list size and send frequency.
Abandoned cart and post-purchase automation
Cart recovery is the single highest-value automation for a store, and post-purchase flows, order confirmation, shipping, review requests and cross-sells, are close behind. Klaviyo and Omnisend both ship these as pre-built, store-connected flows, so they fire on genuine cart and checkout events rather than guesswork, and Omnisend folds SMS into the same sequence. Brevo and Constant Contact can build cart recovery, but with less ecommerce-native data and fewer ready-made templates, so expect more manual setup.
How pricing scales as your list grows
The billing model matters as much as the headline price. Klaviyo charges per active profile, and Omnisend and Constant Contact per contact, so the bill climbs with every subscriber you add. Brevo prices on emails sent, so a large list you email occasionally stays cheap while a small list you email daily can cost more than you expect. There is no single cheapest tool: it depends on your list size against your send frequency, which is exactly what the calculator above works out.
The verdict
Klaviyo is the best overall for a US online store, with the deepest store integration and the strongest flows, from $20 a month. Omnisend is the value pick built for ecommerce with email and SMS together, from $16. Brevo is the cheapest serious option at $9 a month with unlimited contacts, best when your list is large but your send volume is modest, and Constant Contact suits a smaller store wanting a simple, established tool at $12. Use the calculator above to cost each at your list size and send volume.