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🔬 Lab Findings 🔧 Stack Builder

Email Marketing Apps for Shopify — Performance Ranked

9 benchmarked email marketing and automation apps, ranked by real JavaScript overhead measured in StackConflict's clean-room lab.

9 Apps benchmarked
5 Grade A or B
38 ms Avg CPU cost
152 ms Avg mobile CPU
★ 4.3 Avg merchant rating
FASTEST

Drip is the lightest email marketing and automation app we've tested — 87.89 KB payload and 9 ms CPU (Grade B).

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#1
B
Drip
by Drip
📦 87.89 KB
⚡ 9 ms desktop
📱 50 ms mobile ✓
📐 Layout stable
★ 4.2 56
Acceptable
#2
B
Emarsys
by SAP
📦 58.46 KB
⚡ 5 ms desktop
📱 60 ms mobile ✓
Acceptable
#3
B
Flashy
by Flashyapp
📦 42.34 KB
⚡ 21 ms desktop
📱 83 ms mobile ✓
📐 Layout stable
★ 5 19
Acceptable
#4
B
MailerLite
by MailerLite
📦 48.68 KB
⚡ 9 ms desktop
📱 15 ms mobile ✓
📐 Layout stable
★ 3.2 29
Acceptable
#5
B
Omnisend
by Omnisend
📦 82.9 KB
⚡ 39 ms desktop
📱 92 ms mobile ✓
★ 4.8 3k
Acceptable
#6
C
Back in Stock Alerts
by Amp
📦 203.34 KB
⚡ 4 ms desktop
📱 27 ms mobile ✓
Heavy
#7
C
Flodesk
by Flodesk
📦 163.88 KB
⚡ 29 ms desktop
📱 66 ms mobile ✓
Heavy
#8
C
GoLove AI
by GoLove AI
📦 164.47 KB
⚡ 5 ms desktop
📱 27 ms mobile ✓
📐 Layout stable
Heavy
#9
D
Privy
by Privy
📦 2952.99 KB
⚡ 223 ms desktop
📱 974 ms mobile ✓
📐 Layout stable
★ 4.5 4k
Critical

How we measure — Each app is injected into a clean Shopify dev store in a Playwright-controlled browser with no other apps installed. V8 CPU cost is the ScriptDuration delta before and after injection. Mobile estimate applies Google Lighthouse's 4× slowdown factor.

Read the full methodology →