The best SMS marketing that integrates with Klaviyo
"Integrates with Klaviyo" is doing a lot of lying on vendor pages. A real integration shares profiles, events and — the part that gets you sued if it breaks — consent records. A fake one is a Zapier bridge that silently drops a field the morning of your biggest send. If you already run email in Klaviyo, its own SMS is not an integration at all; it is the same database, and nothing third-party can beat that. Among outside tools, only Postscript and Attentive genuinely sync. SimpleTexting, Sakari and EZ Texting are fine business-texting tools wired to Klaviyo with tape — and your consent data ends up in two places, which is a TCPA problem waiting to happen.
An integration is only worth buying if it shares data both ways without breaking, so we weighted depth of native Klaviyo sync and a shared consent record above everything, then portability — because if you cannot export your subscribers and their opt-in timestamps, you do not own your list, you are renting it. See the full rubric →
Depth of native Klaviyo sync — profiles, events, flows35%
Two-way subscriber & consent sync (TCPA-safe)20%
Export of subscribers and consent records — no lock-in20%
Deliverability15%
Real cost at your volume10%
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RANK
★ Editor’s Choice
Klaviyo SMS
Editor’s pick
If you already run email in Klaviyo, its own SMS is not an integration — it is the same database. One profile, one consent record, one set of flows firing email and text off the same events. Nothing third-party can match that, because nothing else lives inside your data. You buy credits (about $0.012 down to $0.009 per SMS in the US, 150 free a month) and you can export every subscriber and consent record on the way out.
The one genuine third-party option. Postscript's Klaviyo integration syncs subscribers and key events both ways, so flows can hand off without a brittle bridge. It is built for Shopify brands, so the fit is best if that is your stack. Starter is free on pay-per-message; Growth is $25/mo, and your list and consent export cleanly.
Deep integration and strong deliverability, but it is enterprise: custom pricing, quarterly minimums around $2,000–$3,000, and 6–12 month auto-renewing contracts. The integration is real; the exit is not friendly. Worth it only at serious volume.
A solid business-texting tool — but it talks to Klaviyo only through Zapier. That means no true event sync, no shared consent record, and a bridge that breaks when a field changes. Fine for one-off blasts; wrong for integrated flows. The fake-integration trap in plain sight.
Same story: a capable SMS platform with a Zapier-only path to Klaviyo. Decent rates and 90-day credit rollover, but you are stitching two systems together, and your consent data lives in two places — a TCPA exposure, not an integration.
Built for simple campaigns and team texting, not ecommerce flows. No native Klaviyo path at all — Zapier or nothing. If integrated, event-driven messaging is the goal, this is the wrong category of tool.
Klaviyo's own SMS, by a wide margin. It shares the same profiles, events and consent record as your email, so flows fire across both channels with zero integration work. Third-party tools, even good ones, bolt on from outside.
Which third-party SMS tools really integrate with Klaviyo?
Only Postscript and Attentive have genuine, supported integrations that sync subscribers and events. Everything else — SimpleTexting, Sakari, EZ Texting, Textmagic — connects through Zapier, which is not real integration.
What's wrong with a Zapier bridge to Klaviyo?
Three things: no true two-way event sync, so flows fall out of step; no shared consent record, which is a TCPA exposure; and the bridge breaks silently when a field or trigger changes. You find out when a campaign misfires.
Can I get my SMS subscribers and consent out if I leave?
From Klaviyo, Postscript and the business-texting tools, yes — export the list and consent timestamps. Attentive's enterprise contract makes exit the slowest. Always export consent records, not just phone numbers — that is what proves opt-in.