The Shopify App Store holds thousands of apps. The trap is stacking ten of them for functions a well-built theme already handles, and ending up with a store that drags.
Here are the apps I actually install for my clients, category by category. With the same reflex every time: is it worth the weight it adds.
The reflex before installing anything
Each app drops JavaScript onto your site, often on every page, even where it serves no purpose. That code downloads, runs, and blocks your visitor's browser while it does. I took the mechanism apart in detail in my article on the real cost of your Shopify apps.
Two principles I keep in mind. First, a Shopify first-party app is almost always lighter and better integrated than a third-party equivalent. Second, an app you install "just in case" and never use stays a performance debt. If you don't use it, uninstall it.
Customer reviews: Judge.me or Loox
Reviews are the most profitable conversion lever on a product page. Social proof reassures, and Google shows the stars in its results if the markup is clean.
Judge.me is my first choice: known to be light, complete, and its feature-to-price ratio is hard to beat. Loox targets photo and video reviews, perfect for visual brands like fashion or home decor, with a more polished rendering but a slightly higher weight. Both are solid. Just avoid running two at once "to compare," you double the JavaScript for nothing.
Email and SMS: Klaviyo
For email marketing and automations, Klaviyo is the standard on Shopify, and it earns it. Fine segmentation, cart abandonment flows, clean sync with your catalog. It's an app that pays back well beyond what it costs.
If your need is simple, Shopify Email (the in-house app) does the job for basic newsletters, for free and without an extra layer. Start there if you're beginning, you'll move to Klaviyo when your volumes justify it.
Search and navigation: Search & Discovery
Plenty of merchants pay for a third-party search app when Search & Discovery, Shopify's free app, covers the essentials: enhanced search, collection filters, product recommendations. It's built into the core of the platform, so it's light. I put it in by default before considering a paid alternative.
Customer support: Gorgias
Gorgias is the helpdesk built for Shopify. It centralizes your messages (email, chat, social media) and shows the customer context right next to the conversation: orders, tracking, history. For a store starting to drown in requests, it's a real time-saver. On a small volume, native chat or a simple email is still enough.
Loyalty and subscriptions: Smile.io, Recharge
For a points and referral program, Smile.io is simple to set up and well proven. Reserve it for brands with real purchase recurrence, otherwise the points widget clutters the interface without bringing anything in.
On the subscription side, Recharge remains the reference if your model relies on recurring orders (boxes, consumables, coffee). It's a heavy block, so you install it because the business depends on it, not out of curiosity.
The native apps people forget
Over the past few years Shopify has shipped free in-house apps that replace paid third-party ones: Shopify Bundles for product bundles, Shopify Forms for email capture, Shopify Email already mentioned. Before paying for a function, check it doesn't already exist as first-party. It's lighter and it never breaks during a theme update.
The apps I ease off on
Page builders like PageFly or Shogun are powerful, but they add a substantial layer of JavaScript on every page they generate. Handy for a one-off landing page, to avoid for building your whole site: a cleanly coded theme will always be faster.
Same caution with very complete upsell apps like Rebuy. The personalization they offer is real, but so is the performance cost. If you install it, measure its real impact on mobile before keeping it.
And the rule that sums up the rest: stay under a dozen active apps, and clean house every quarter. Most of the stores I audit drag along two or three apps no one uses anymore.
How to choose for your store
Start from your real need. An app is justified if it brings in more, in conversion or time saved, than it costs in speed. The rest is dead weight.
If you want to know which of your current apps are really slowing your store down, and which you can drop without losing anything, that's exactly what I measure in my audit. I give you the numbers, app by app.
