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Comparison

Notify Me! Back in Stock & Preorder for Shopify vs Klaviyo

Notify Me! Back in Stock & Preorder for Shopify lands on Worth it, and Klaviyo lands on Depends.

Notify Me! Back in Stock & Preorder for Shopify

Worth it

Confidence: Low

Low confidence: few independent reviews found, so treat this as a cheap experiment, not a proven pick.

Read the full report

Klaviyo

Depends

Confidence: High

Buy if you run a growing ecommerce brand earning real revenue from email and SMS.

Read the full report

Notify Me! Back in Stock & Preorder for Shopify versus Klaviyo
Compare	Notify Me! Back in Stock & Preorder for Shopify	Klaviyo
Verdict	Worth it	Depends
Best for	Shopify stores with frequent stockouts	Growing Shopify stores
Who it's not for	Stores that rarely sell out . alerts need stockouts to pay off	Small stores watching every dollar
Privacy	No known public vulnerabilities found in the sources reviewed.^²	Multiple public incidents: a 2022 breach of crypto-customer lists, a 2026 password-exposure flaw, and a WordPress plugin XSS CVE.¹⁶
Support quality	No independent user evidence	No support evidence found
Public sentiment	No direct user reviews of Notify Me! surfaced in the sources; reviewed review evidence covers competitor Shopify apps instead.^³	Reviewers praise Klaviyo's ecommerce depth and integrations but consistently complain about pricing and learning curve.
Biggest gotcha	Guess: alert apps typically cap monthly signups; confirm free-plan limits before relying on it^⁶	Charged by active profiles . costs climb automatically as your list grows

Pick Notify Me! Back in Stock & Preorder for Shopify when

Shopify stores with frequent stockouts
Brands preselling via preorders
Stores already using Klaviyo or Omnisend
New stores testing demand cheaply

When Notify Me! Back in Stock & Preorder for Shopify is not a fit

Stores that rarely sell out . alerts need stockouts to pay off
Non-Shopify, non-BigCommerce platforms
Teams wanting full marketing automation, not just alerts . use Klaviyo
Buyers who want apps proven by large review bases

Pick Klaviyo when

Growing Shopify stores
Email + SMS retention marketing
Brands with dedicated marketing staff
Revenue-focused ecommerce teams

When Klaviyo is not a fit

Small stores watching every dollar
Teams wanting a simple newsletter sender
Non-ecommerce B2B or SaaS companies
Anyone unwilling to learn a complex tool

Sources

Pricing . Notify Me! Back in Stock & Preorder for Shopifynotify-me.io
official
Notify Me! security pagenotify-me.io
security
The 10 Best Preorders Apps for Shopifyrankbase.io
review
EZ Preorder & Back In Stock reviewsapps.shopify.com
review
The Complete Restock Alerts Guide for Shopifyhubbvee.com
review
Back in Stock Product Alerts App for Shopify Reviewdigismoothie.com
review
Shopify Pre-order Apps comparisonhulkapps.com
review
How Preorder and Restock Alerts Power High-Volume Toy Retailerstimesact.com
news
Klaviyo Features | G2g2.com
review
Klaviyo Reviews | Trustpilottrustpilot.com
review
Klaviyo Review | PCMagpcmag.com
review
Klaviyo User Reviews Analysis: 300-Review Studyomnisend.com
review
Why is Klaviyo so complicated to use? | Redditreddit.com
review
Klaviyo Pricing | Officialklaviyo.com
official
Klaviyo Pricing Hidden Fees Explained | Omnisendomnisend.com
review
Email marketing firm hacked, crypto lists stolen | BleepingComputerbleepingcomputer.com
security