Custom Shopify App vs. App Store App: Which Do You Need?
The Shopify App Store has an app for almost everything — so why would anyone build their own? Because “almost” is doing a lot of work. Here is how to decide between installing an existing app and building a custom one.
What each option really is
An App Store app is built once for thousands of stores. It covers the common case well, it is maintained by its developer, and you pay a monthly fee — often per feature tier, sometimes by usage.
A custom app is built for one store: yours. It does exactly what you need and nothing you do not, and it can use your store's own data, naming and workflow. Until recently that meant paying a developer; an AI Shopify app builder has made it a sentence.
When an App Store app is the right call
- The problem is common and well solved. Reviews, email marketing, shipping labels and subscriptions have mature apps with years of edge cases handled.
- You need a large ecosystem. Integrations with dozens of other tools are a reason to pick a popular app.
- The app needs to be certified for a sensitive area, such as payments, where you want a vendor that specialises in it.
When a custom app pays for itself
- You are stacking three apps to do one job. Each one costs a monthly fee and adds script weight to your store; one custom app can replace the stack.
- Your workflow is the advantage. If the way you bundle, price, fulfil or report is what makes your business different, a generic app will flatten it.
- You need one small thing. A single report or a single checkout note does not justify a full-featured app with a monthly plan.
- You want to own it. A custom app built with AppFly is a project you can read, export and run yourself — no vendor can change the price or retire the feature under you.
Five questions that settle it
- Does an existing app do exactly what I need, or will I work around it?
- How many monthly app fees would a custom app replace?
- Is this workflow specific to my store, or the same for everyone?
- Will I need to change it often?
- What happens to my data if the vendor changes course?
If most answers point to “specific, often changing, and mine”, build it. The cost guide helps you put numbers on it.
You can use both
This is not either-or. Most stores run a few mature App Store apps for the commodity jobs and a handful of small custom apps for the things that are theirs alone — the report the owner actually reads, the checkout message that matches their returns policy, the bulk tool their team asked for. Starting with one small custom app is the cheapest way to find out where the line is for your store.
Frequently asked questions
What is a custom Shopify app?
A custom app is built for a single store rather than distributed to many through the Shopify App Store. It uses Shopify's APIs to add exactly the features that store needs.
Are custom Shopify apps worth it?
They are when an existing app does not fit your workflow, when you would otherwise pay for several apps to do one job, or when you want to own the code. For common, well-solved problems an App Store app is usually enough.
Can I build a custom Shopify app myself?
Yes. With an AI Shopify app builder like AppFly you describe the app in plain language and it builds, installs and runs it for you.