Shopify apps and integrations: what to solve with an app, and what not to

The Shopify App Store lists more than 13,000 apps, and that's both the opportunity and the problem. Almost any feature you're missing can be added in a few clicks — but every app you install costs money, load time and maintenance. A healthy Shopify store doesn't have the most apps, it has the right ones. This article covers how the App Store works, which categories actually matter, what belongs in theme code instead, and what to watch for if you serve Dutch (or other European) customers.

How the Shopify App Store works

Apps run via the Shopify API and, unlike classic CMS plugins, don't need to be installed on your own hosting. That's a real advantage: apps break your store less often than WordPress plugins do, because Shopify guards the core structure. Still, many apps inject their own JavaScript into your theme (for pop-ups, reviews, upsells), and that script counts fully towards your load time regardless of how "native" the app looks.

Apps generally work in a few ways within your store:

• Embedded apps with their own screen inside your Shopify admin (an email tool or accounting integration, for example)
• Theme app extensions, blocks you place yourself in the theme editor without touching code
• Checkout extensions, which add functionality to the checkout (increasingly common via Shopify Functions instead of separate checkout page edits)
• Webhooks and API integrations with external systems, often invisible to the shopper but essential to your back office

What apps cost in money and performance

The direct costs are easy to track: most apps run on a monthly subscription between €10 and €150, often with a free tier up to a certain order volume. The indirect costs are harder to quantify but just as real:

Cost	What happens
Load time	Extra scripts raise LCP and sometimes INP, especially with apps that inject their own CSS/JS on every page
Checkout conversion	Too many pop-ups, badges and upsell windows increase friction instead of trust
Management overhead	Every app has settings that can expire: an expired API key can quietly break an integration
Removal costs	Some apps leave "leftovers" in theme files after uninstalling
Compounding	Five light apps together can weigh more than one solid app, because each one loads separately

A practical rule of thumb: assume every active app has a marginal impact on load time, and ask yourself with every install whether the revenue or time saved justifies that cost. This connects directly to Shopify SEO and conversion: a slower store converts structurally worse, no matter how good the individual app is.

App categories with well-known examples

Email, marketing and CRM

Klaviyo is the de facto standard on Shopify for email marketing and flows (welcome series, abandoned cart, post-purchase). Omnisend and ActiveCampaign are also widely used. Businesses already running HubSpot can connect it directly so order data lands in the same CRM database as their leads and deals.

Reviews and social proof

Judge.me, Loox and Yotpo collect product reviews, often with photos, and display star ratings in Google results via structured data. Watch out: many review apps load their widget synchronously, which can slow down product pages unless you enable lazy loading.

Search & filters (faceted navigation)

Out of the box, Shopify's search is limited: no synonyms, no advanced custom facets. Apps like Searchanise, Boost AI Search & Discovery and Algolia solve this with filters on brand, size, price and availability. For large catalogues, this is often the single most valuable app in the whole stack.

Subscriptions

Recharge and Shopify's own Subscriptions API enable recurring orders, essential for coffee, personal care products or pet food. As Shopify keeps expanding native support, deciding between built-in functionality and a dedicated app is one of the first things to figure out when setting up a subscription model.

Loyalty and retention

Smile.io and LoyaltyLion build points systems and VIP tiers. These apps typically render a separate widget screen, which usually has limited performance impact as long as it doesn't load on every page.

PIM/ERP integrations

For stores with large catalogues or multiple sales channels, connections to a PIM (Akeneo, for instance) or ERP (Exact, SAP Business One, NetSuite) are usually custom work via the Shopify Admin API rather than an off-the-shelf app. This belongs in the conversation around Shopify migration when moving from another system and needing to preserve existing data sources.

Shipping and returns

In the Netherlands and Belgium, MyParcel and Sendcloud are the best-known tools for generating shipping labels for PostNL, DHL and DPD and automatically sending tracking information. For returns, dedicated apps (such as Returnless or ReturnGO) offer a self-service returns portal, increasingly relevant under EU rules around the right of withdrawal.

Accounting

Exact Online and Moneybird have their own integrations (direct or via a middleware app) that push orders, VAT and invoices straight into your accounting package. This avoids double entry during VAT filing, provided the integration is mapped correctly to the right ledger accounts per product category.

Payments

Shopify Payments supports iDEAL by default for Dutch customers. Merchants who prefer Mollie (for example due to existing accounting integrations) can add it as a separate payment provider, though this means losing some Shopify-native features like Shop Pay.

Analytics and consent

Alongside GA4 and the Meta Pixel, a consent management platform (such as Cookiebot or Complianz) is required as soon as you use tracking cookies and serve European visitors. Server-side tracking via Shopify's own Customer Events is increasingly used in 2026 to limit tracking loss caused by ad blockers.

What's better solved in theme code than with an app

Not every need requires an app. Examples where theme adjustments are usually faster, cheaper and lighter:

• Simple UI tweaks: a sticky "add to cart" bar or a custom product gallery can usually be done with a theme app extension or a small Liquid change
• Announcement bars and banners: often already built into modern themes (like Dawn and its derivatives)
• Simple product badges ("new", "sale"): via metafields and Liquid logic, no external app needed
• Basic wishlist functionality: buildable with customer metafields without ongoing subscription costs
• FAQ accordions and tabs: standard theme sections often already cover this

Rule of thumb: if the feature is purely visual and doesn't need external data or automated workflows, try theme code or a metafield-based solution first before committing to a subscription.

Market-specific needs (illustrated with the Netherlands)

Need	Solution
iDEAL as a primary payment method	Available by default via Shopify Payments, no extra app needed
PostNL/DHL shipping labels and tracking	MyParcel or Sendcloud
VAT-correct invoices (NL/BE/EU OSS)	Invoicing app or integration with Exact/Moneybird, configured correctly per country for international sales
Localised checkout copy	Shopify Markets or language settings, possibly with a translation app for theme strings
Invoice requirements for business customers	Handled via metafields or an invoicing app that validates VAT numbers

Similar local requirements exist in most markets — the point is to identify them early rather than bolt them on after launch.

Checklist: app selection criteria

Before installing an app, it's worth checking at least these points:

1. Does this do something native Shopify or the theme can't already handle?
2. How many scripts does the app load, and only where needed or on every page?
3. What does the app cost at your order volume over 12 months, not just the entry price?
4. Are there reviews from stores of a similar size to yours?
5. How easily can the app be removed again without leaving clutter behind?
6. Is data processing GDPR-compliant, especially for tools sending customer data abroad?
7. Is there already a similar app in your stack that covers this (partially)?

App hygiene: periodic audits

Apps you needed once often stay active long after usage has stopped. A twice-yearly audit prevents unnecessary costs and slow pages:

• Go through the list of installed apps and ask, per app: when was this last genuinely used?
• Test the load time of a product page with Lighthouse or PageSpeed Insights, with and without specific apps disabled
• Check whether old apps still inject scripts cluttering your theme.liquid
• Check for duplicate functionality: two review apps, two pop-up tools, two tracking pixels happens more often than you'd think
• Remove trial apps that stayed active after a test

This audit fits naturally alongside a broader look at Shopify costs: apps are often the biggest hidden cost line next to the subscription itself.

Frequently asked questions

How many apps can a Shopify store handle without slowing down?

There's no fixed maximum, it depends on what each app does. Five light, well-configured apps can have less impact than two heavy apps loading JavaScript everywhere on the site. Always measure actual load time rather than aiming for a specific count.

Are free apps just as good as paid ones?

Not necessarily worse, but often more limited in functionality or support. For critical processes like shipping or accounting, a paid, well-maintained app is usually more reliable than a free alternative with infrequent updates.

Can I combine apps with a custom theme?

Yes, as long as the app works via theme app extensions or an API integration that doesn't conflict with your own Liquid code. With heavily customised themes, it's wise to test apps on a development store first before going live.

What happens to my data if I remove an app?

That varies per app. Some remove all linked data immediately, others keep information on their own servers. Check this beforehand in the app's privacy policy, especially for customer data or order history.

Should I choose apps based on App Store reviews?

Reviews are an indication, but say little about how an app performs at your specific order volume or theme. Always test yourself, ideally first on a development store.

Does app selection matter for SEO?

Indirectly, yes: apps that increase load time, generate duplicate content (for instance via separately generated landing pages) or block canonical tags can negatively affect Shopify SEO. Choose apps partly based on their technical footprint.

Not sure which apps make sense for your store, or want an existing app stack reviewed for cost and performance? Get in touch, we're happy to think along, no obligation. Curious how apps fit into a broader Shopify strategy? Check out our pages on Shopify, webshops and conversion.