MailerLite vs Sendlane: Shopify Performance Comparison
⏳ Data pending for Sendlane — our scanner captured only the async loader stub for this app. Full bundle metrics are being collected from live Shopify storefronts. Once available, this page will show a complete head-to-head comparison.
Both MailerLite and Sendlane provide email marketing and automation functionality for Shopify stores.
What We Know: MailerLite (Benchmarked)
MailerLite has been measured in StackConflict’s clean-room lab:
| Metric | MailerLite |
|---|---|
| Overall Grade | B |
| JS Payload | 48.68 KB |
| CPU Desktop | 9 ms |
| CPU Mobile | 15 ms (0.0s) |
| Layout Shift | 0.0006 |
Grade B means MailerLite passes every StackConflict threshold — safe to install on any storefront including mobile-first stores.
View full MailerLite speed report →
Pending: Sendlane
StackConflict’s scanner detected that Sendlane uses an async JavaScript loader — a small stub that only initialises its full bundle on a real, authenticated Shopify storefront. This means our lab environment captured the tiny stub file only, not the production bundle that actually runs on live stores.
We are collecting real bundle data by scanning public Shopify storefronts. Once captured, the head-to-head metrics for Sendlane will appear here automatically.
View Sendlane on Shopify App Store →
About This Test
StackConflict measures each Shopify app in an isolated clean-room environment — a Playwright-controlled browser with no other scripts installed. V8 CPU cost is the ScriptDuration delta measured before and after bundle injection. Mobile CPU applies the standard 4× Lighthouse slowdown factor.
MailerLite data from the StackConflict Lab (2026-05-30). Sendlane data pending.