Disclosure: The Sequenzy links in this article are affiliate links, and I earn a commission if you sign up through them. I only write about tools I have actually run, and nothing here is softened for the affiliate. Where a thing was clunky, I say so.
Most reviews of an email tool are written by someone clicking through the dashboard. This one is different, because I barely touched the dashboard. I rebuilt a real abandoned-checkout recovery flow for one of my stores almost entirely through Sequenzy's REST API, driven by an AI coding agent. That turned out to be the most interesting thing about the tool, and the most honest way to judge where it actually stands against Klaviyo.
Sequenzy is an indie, agent-first email platform. I run a small gold-jewelry store, and its cart-recovery emails were the thing standing between me and real revenue that leaked every day. This is not a thought experiment: the flow is live on the store right now, and it has already recovered its first cart, delivered and opened. Here is exactly what happened, warts included.
The setup: an email flow built by an agent, not a human
I did not open the sequence builder and drag blocks around. I pointed an AI coding agent at Sequenzy's REST API and asked it to read the account, find the abandoned-checkout sequence, and get it production-ready. Everything below, reading the flow, editing the emails, inserting steps, fixing links, was done through API calls, not clicks.
What the agent caught before a single customer saw it
The auto-generated recovery email looked fine at a glance. It was not. Three real problems, in order of how much they would have cost me:
- The button opened an empty cart. The link pointed at a generic /cart page, not the customer's actual saved checkout. The trigger event carries the real checkout URL, but the generated email ignored it.
- The product was hardcoded. The email named one specific product, price, and photo, baked in. Every abandoner would have seen that same item regardless of what they carted.
- The follow-up emails had no unsubscribe. Inserted as raw HTML, they came through with no footer and no unsubscribe link, which is a compliance problem, not just an ugly one.
None were dramatic. All three quietly kill a flow's conversion or land you in trouble. Working through the API, with an agent that reads back what it changed, surfaced them immediately.
The rough edges, said plainly
- The generated flow shipped paused, and it was not obvious it needed activating.
- Raw HTML inserts silently dropped the compliance footer.
- The API returned a 403 to a non-browser user agent, which can trip up scripted and agent traffic.
To the platform's credit, I flagged these to the founder and got same-day fixes on more than one. That responsiveness matters more than a perfect first run.
Sequenzy vs Klaviyo, without the marketing
I use Klaviyo for other stores, so this is a fair comparison. For a human building e-commerce flows in a UI, Klaviyo is still easier today. It ships a prebuilt abandoned-checkout flow with a native dynamic cart block, and Sequenzy does not match that yet. If you want the full picture on when a store outgrows Shopify Email and whether Klaviyo is worth its price, I wrote that up in Klaviyo vs Shopify Email.
But that is not the game Sequenzy is playing. Its edge is that I built and fixed this entire flow from an API and an agent, start to finish, which Klaviyo cannot do. If you build with agents, Sequenzy is less friction, not more. The gap it needs to close is prebuilt e-commerce templates with dynamic carts, so nobody hand-builds the recovery email.
The real lesson
Building through an agent changed what I noticed. A broken cart link, a lie about which product someone carted, a missing unsubscribe: these are exactly the things a human skims past in a nice-looking template and an agent reads out loud. That is the same reason we build the way we do at Devaland: systems where the machine shows its work, so the expensive mistakes surface before a customer ever hits them.
If you build with agents, Sequenzy is worth a serious look today, with clear eyes about where it is still behind. If you build by clicking, give it a few months on the e-commerce templates. Either way, an email flow you can hand to an agent and have it catch your mistakes is a genuinely new thing, and it is here.
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