Is Klaviyo compatible with HPOS and Checkout Blocks?
Plugin by klaviyo · checked by Raz Technologies from v3.9.0 on · How we check
Klaviyo 3.9.0 declares compatibility with HPOS (High-Performance Order Storage) in its code. Klaviyo 3.9.0 does not declare Cart and Checkout Blocks compatibility, but its code uses the WooCommerce Blocks integration API. Its "WC tested up to" header says WooCommerce 11.0; the current WooCommerce release is 11.2.2.
| Check | Status | Evidence |
|---|---|---|
| HPOS (High-Performance Order Storage) | Yes— Declares HPOS compatible (klaviyo/klaviyo.php). Evidence: declared. Verified 28 Oct 2026 (v3.9.0). | Compatibility declaration in klaviyo/klaviyo.php Declared |
| Cart & Checkout Blocks | Not declared— No Cart/Checkout Blocks declaration in v3.9.0. Evidence: declared. Verified 28 Oct 2026 (v3.9.0). | No declaration; the code uses the Blocks integration API Declared |
| WooCommerce 11.2.2 | Partial— WC tested up to 11.0; current WooCommerce 11.2.2. Evidence: declared. Verified 28 Oct 2026 (v3.9.0). | "WC tested up to: 11.0" in the plugin header Declared |
Read from the plugin's zip on WordPress.org (v3.9.0), 28 Oct 2026. Declared = what the plugin's own code states; not a lab test. Re-checked within hours of every new version.
What this means for your store
- You can enable HPOS with Klaviyo active: the plugin's own code declares it supports the HPOS order tables. As with any change to order storage, try it on a staging copy first.
- If your store uses the block-based Cart and Checkout (the default for new WooCommerce stores), check that Klaviyo's features appear there on a staging copy. The classic checkout (the [woocommerce_checkout] shortcode) is the fallback.
- Its code does use the WooCommerce Blocks integration API (payment gateways typically register a block payment method this way), so it likely works in the block checkout even without a declaration. This is a hint from the code, not a declaration.
Klaviyo at a glance
| Version | 3.9.0 |
|---|---|
| Last updated | 28 Oct 2026 |
| Active installs | 100,000+ |
| Rating | 2.8/5 (24 ratings) |
| WC tested up to | 11.0 |
| WC requires at least | 8.2 |
| Requires WordPress | 6.2 |
| Tested up to WordPress | 7.0.8 |
| Requires PHP | 7.4 |
Source: WordPress.org, .
Versions we have checked
| Version | HPOS | Checkout Blocks | WC tested up to | Checked |
|---|---|---|---|---|
| 3.9.0 | declared compatible | not declared | 11.0 | 28 Oct 2026 |
| 3.8.3 | declared compatible | not declared | 5.5.2 | 15 Oct 2026 |
A new row is added each time a new version is released and scanned.
Similar WooCommerce plugins: HPOS and Checkout Blocks
| Plugin | Installs | HPOS | Checkout Blocks |
|---|---|---|---|
| WooCommerce Analytics | 20,000+ | Yes | Not declared |
| Pinterest for WooCommerce | 200,000+ | Yes | Yes |
| Kadence WooCommerce Email Designer | 90,000+ | Yes | Not declared |
| SlimStat Analytics | 70,000+ | Yes | Not declared |
| Email Marketing | 40,000+ | Yes | Not declared |
| GTM Kit | 30,000+ | Yes | Yes |
FAQ
Is Klaviyo compatible with HPOS?
Klaviyo 3.9.0 declares compatibility with HPOS (High-Performance Order Storage) in its code. Checked 28 October 2026 from the plugin's code on WordPress.org.
Does Klaviyo work with the WooCommerce Checkout Blocks?
Klaviyo 3.9.0 does not declare Cart and Checkout Blocks compatibility, but its code uses the WooCommerce Blocks integration API. Checked 28 October 2026.
Is Klaviyo compatible with WooCommerce 11.2?
Its "WC tested up to" header says WooCommerce 11.0; the current WooCommerce release is 11.2.2. Checked 28 October 2026.