Both Popsixle and Elevar offer server-side tracking direct from Shopify and identity resolution to boost audiences. Popsixle is narrowly focused on Meta (Facebook/Instagram) ads performance, making it limited if you run broader channel marketing. Elevar covers more marketing platforms via server-side Google Tag Manager, but GTM still relies partly on browser-side tags, meaning it can miss events the browser doesn't capture — limiting the completeness of your customer journey data. Elevar has also been absorbed into Buxton/Audiense, shifting focus away from pure ecommerce tracking.

Littledata wins by pulling data directly from Shopify's servers without any GTM dependency, capturing the full customer journey including checkout steps natively. It supports Shopify Markets out of the box, requires zero code setup, and offers a 30-day free trial to prove value risk-free — advantages neither Popsixle nor Elevar can match.

For 50 orders, Popsixle is 144% more expensive than Littledata, while Elevar is 413% more expensive. At 500 orders, Popsixle and Elevar are equal, but Littledata is 10% more expensive than both. For 5000 orders, Popsixle is 31% more than Elevar and 68% more than Littledata. At 20000 orders, Popsixle is 29% more than Elevar and 37% more than Littledata, while Elevar is 6% more than Littledata.

Popsixle only supports Meta Ads as a data destination, making it a single-channel solution focused exclusively on Meta's Conversions API.

Elevar and Littledata both offer broad multi-channel destination support, covering the major ad platforms, analytics tools, and marketing automation platforms.

The key differentiator between the two: Littledata includes Segment as a destination, making it the stronger choice if you want to pipe server-side data into a broader data infrastructure. Elevar's destination list is otherwise nearly identical but lacks Segment integration.

If your stack relies heavily on Meta alone, Popsixle suffices — but for a comprehensive multi-channel server-side tracking setup on Shopify Plus, Elevar or Littledata are the more robust options.