Postforge vs Klaviyo
Klaviyo started as email for Shopify and grew into a suite with SMS, reviews, a help desk and a customer service agent, billed by active profiles. Postforge does email only: open source, on your own sending, never priced per stored profile.
Claude
Codex
CursorCopies a prompt your agent can run to set up Postforge for your store.
Side by side.
What each one is built for, how it sends, how it’s priced and who owns it. Facts about Klaviyo come from its own website and pricing pages, checked in October 2026.
| Topic | Postforge | Klaviyo |
|---|---|---|
| Focus | PostforgeEmail for ecommerce, nothing else | KlaviyoEmail and SMS, plus WhatsApp, mobile push, reviews, a help desk and a customer service agent |
| Platforms | PostforgeShopify, with full history and live sync; more platforms follow on the same core | KlaviyoShopify, WooCommerce, BigCommerce, Adobe Commerce and many more through integrations |
| Sending | PostforgeYour own Resend or Amazon SES account, keys and domain | KlaviyoKlaviyo’s own sending infrastructure |
| Pricing model | PostforgeNever per stored profile; you pay your provider directly for what you send, without a markup | KlaviyoBy active profiles: everyone who may receive your marketing email counts, whether you email them or not |
| AI | PostforgeTyped definitions with published schemas, one open API and an MCP server; every AI change is a proposal a person approves | KlaviyoBuilt-in AI features such as Composer and Customer Agent, and an MCP server for Claude and ChatGPT |
| Ownership | PostforgeOpen source (AGPL-3.0), self-hostable, your data in your database | KlaviyoClosed-source SaaS from Klaviyo, Inc. (NYSE: KVYO) |
Which one fits you.
Both send good email. The difference is what else you want from the same tool, how you send and how you pay.
Pick Postforge if
- You sell on Shopify and want email done properly, without a suite
- You want to send through your own Resend or Amazon SES account
- You don’t want to pay for profiles you never email
- You want your AI agent to set up and run your email, with a person approving every change
- You want open source, with your data in your own database
Pick Klaviyo if
- You want email, SMS, WhatsApp and push in one tool
- You also want reviews and a help desk from the same vendor
- Your store runs on a platform Postforge doesn’t support yet
- You want a long-established vendor with a large partner ecosystem
Switching from Klaviyo.
Your store already holds your customers, orders and consent, so most of the move is setting up your sending and rebuilding your flows as automations. Your agent can do much of it.
- 1
Connect your store
Install Postforge on Shopify. Customers, orders, products and email consent come in with their full history, so there is nothing to export.
- 2
Carry over your unsubscribes
Make sure everyone who unsubscribed in Klaviyo is unsubscribed in your store too. Postforge only emails people with consent and writes every unsubscribe back to the store.
- 3
Set up your sending
Connect Resend or Amazon SES and verify your domain. Start with your most engaged subscribers and grow volume over a few weeks, so inbox providers get to know your new sending.
- 4
Rebuild your automations
Start from the ready-made welcome, abandoned checkout, browse abandonment, post-purchase and win-back automations, or have your agent draft them from your Klaviyo flows. You approve each one.
- 5
Switch over
Turn on each automation in Postforge as you turn off its counterpart in Klaviyo, so nobody gets both.
Questions, answered.
What people ask when they compare Postforge and Klaviyo.
Is Postforge a Klaviyo alternative?
For email, yes. Postforge covers what ecommerce brands use Klaviyo email for: segments, campaigns, automations like abandoned checkout and win-back, and revenue attribution, on your store’s data. It doesn’t do SMS, reviews or a help desk.
How is the pricing model different?
Klaviyo bills by active profiles: everyone who may receive your marketing email counts, whether you email them or not. Postforge is never priced per stored profile, and sending runs on your own Resend or Amazon SES account, so you pay them directly for what you send, without a markup.
Can I move my Klaviyo flows to Postforge?
Not automatically yet. Start from the ready-made automations, or have your agent draft them from a description of your Klaviyo flows; you approve each one. A direct import of profiles, consent, suppressions and lists from Klaviyo is planned.
Klaviyo has an MCP server too. What is different?
Both let AI clients work with your account. In Postforge every automation, segment and template is a typed document with a published schema, everything the dashboard does is in the same open API, and every change an AI makes arrives as a proposal with a diff and a dry run that a person approves before it goes live.
Does Postforge do SMS?
No. Postforge is email only. If you want SMS from the same tool, Klaviyo is the better fit; otherwise keep a separate SMS tool next to Postforge.
Email is your best channel. Own it.
Open source, on your own sending, set up by your agent in an afternoon.