Shopify Custom App Development Company: What to Look For
How to choose a Shopify custom app development company: private vs public apps, what to automate, cost drivers, App Store review, and the questions that reveal real experience.
A Shopify custom app development company builds software that runs inside your store and does what no off-the-shelf app will do: your pricing logic, your warehouse rules, your CRM, your approval flow. If you have outgrown spreadsheets, Zapier chains and manual CSV exports, a custom app is usually cheaper than the salary hours it replaces.
This guide covers the decisions that actually matter: private versus public apps, what is worth automating, how to evaluate a partner, and what drives cost and timeline. We build Shopify apps ourselves — both our own products and private apps for merchants — so the checklist below is the one we would want a client to use on us. You can see the full scope on our Shopify apps service page.
Private vs public Shopify apps: which one your store needs
Most merchants searching for a Shopify custom app development company do not need a public app. They need a private one.
| Private app | Public app | |
|---|---|---|
| Who uses it | Your store only | Any Shopify merchant |
| Distribution | Direct install, custom or unlisted | Shopify App Store listing |
| Review | No App Store review | Full Shopify review, plus ongoing requirements |
| Billing | You pay the developer | Shopify Billing API, usage or subscription |
| Typical timeline | Weeks | Months |
| Best for | Custom workflows, internal tools, ERP/CRM sync | A product you want to sell to other merchants |
A private app is the right call when the value is internal: syncing orders to your ERP, enforcing pricing rules, generating custom documents, or giving your ops team a dashboard Shopify does not ship with.
A public app makes sense when you have a repeatable problem that thousands of merchants share, and you are prepared to support it: documentation, a support inbox, Shopify's review process and periodic API version upgrades. If you are unsure, start private. You can always productise later, and the core logic usually carries over.
Embedded vs standalone
One more decision before code: does the app live inside the Shopify admin (embedded, using Shopify's Polaris design system and App Bridge) or as a separate dashboard? Embedded apps get adopted faster because staff never leave the admin. Standalone tools suit complex back-office work with many non-Shopify users.
What a custom Shopify app can automate
Concrete jobs we see most often, roughly in order of payback:
- Order and fulfilment routing. Split orders by warehouse, tag, product type or customer tier; push to 3PL or ERP; write tracking back to Shopify automatically.
- Inventory and stock sync. Keep Shopify, your ERP and your CRM on the same numbers. No overselling, no manual reconciliation.
- CRM sync. Customers, products, stock and orders flowing into Zoho CRM or HubSpot in real time — no CSV exports, no brittle Zapier chains.
- Pricing and discount logic. Contract pricing, tiered B2B rates, bundle discounts, regional rules. Shopify's native discounts cover the simple cases; custom apps cover the rest.
- Product data operations. Bulk edits, enrichment, SEO fields, translations, image handling — with a review step before anything goes live.
- Merchandising and recommendations. "Complete the look" bundles, cross-sell logic, personalised collections.
- Internal tools. Approval queues, returns portals, supplier scorecards, custom reporting.
- AI features. Support chatbots, product Q&A, and agents that read your CRM and store data to draft replies or trigger workflows.
A quick test for any automation idea
Ask three questions. How many hours per week does this cost today? What breaks when a human forgets a step? Can an existing app do 80% of it for a monthly fee? If the answer to the third is yes, buy the app. If the process is genuinely yours, build.
How to evaluate a Shopify app development partner
Most agencies can write code. Fewer understand Shopify's platform constraints. Use this checklist in your first call.
- Do they know the current API surface? Admin GraphQL API, webhooks, Shopify Functions, checkout extensibility, App Bridge and Polaris. If the answer is "we'll use the REST API the way we always have", that is a warning sign.
- Do they handle OAuth, sessions and webhook verification properly? This is where cheap builds leak data and fail audits.
- Can they show a live app? Ask for an install link or a demo store. Our own apps are public: ZohoSync, Lookfit AI and SEO Products by EP Digital are all installable today.
- How do they handle API version upgrades? Shopify ships new versions quarterly. Ask who owns upgrades after launch.
- What happens when a webhook fails? You want retries, logging and an alert — not silence.
- Who owns the code? Get it in writing. You should own the repository, or at minimum have full access and an escrow clause.
- Do they build with any stack, or only one? The right answer is "whatever fits your systems" — Node.js, PHP/Laravel, Python, .NET, Go and Remix are all reasonable, and Shopify's own Hydrogen and Remix tooling is common for app front ends.
- Is there a review step before data changes? For anything touching live products or prices, you want a preview-and-approve flow, not blind writes.
Red flags
- No staging store or test plan.
- No mention of rate limits, backoff or queueing.
- Fixed price with no discovery, then constant change requests.
- Nobody can explain what happens to your data if you stop paying.
Timeline, cost drivers and Shopify App Store review
There is no honest flat price for custom software. What drives the number:
- Scope and integrations. One webhook to one endpoint is days. A two-way sync with ERP, CRM and 3PL, with conflict resolution, is weeks.
- UI complexity. A settings page is cheap. A full embedded admin with roles, filters and bulk actions is not.
- Data migration and backfill. Historical orders and customers always take longer than expected.
- Public app requirements. App Store review, billing, privacy policy, GDPR webhooks, support docs and listing assets add real time.
- Ongoing maintenance. Budget for API upgrades, monitoring and small changes after launch.
A realistic shape: a focused private app with one integration can be scoped in days and built in a few weeks. A public app with billing and review is a multi-month project. Anyone quoting a public app in two weeks has not read the requirements.
What Shopify review actually checks
For public apps: correct OAuth and scopes (ask for the minimum), GDPR mandatory webhooks, no forced redirects, clear billing, working uninstall, and a listing that matches the app. Review feedback is usually about edge cases and permissions, not features. Plan one round of fixes.
Our Shopify apps: ZohoSync, Lookfit AI and SEO Products
We are not only a services shop — we ship our own Shopify apps, which is the fastest way to judge how we build.
- ZohoSync keeps a Shopify store and Zoho CRM in sync in real time. Customers, products, stock and orders flow into Zoho CRM with no CSV exports and no Zapier chains. Shopify App Store listing coming soon.
- Lookfit AI reads a Shopify catalogue and builds "Complete The Look" bundles for every product page. The merchant reviews and approves; shoppers add the whole bundle in one click with a real Shopify discount. Shopify App Store listing coming soon.
- SEO Products by EP Digital audits a whole catalogue with 22 checks and a 0–100 health score, then fixes product and collection fields in bulk with AI or custom rules — side-by-side review before anything goes live.
All three follow the same principle we apply to client work: AI proposes, the customer approves, nothing is published without review. If you want the same approach applied to your own workflow, see our Shopify apps service page or compare all our products on the products page.
Book a scoping call
Bring the process you want automated, the systems it touches, and roughly how many hours a week it costs you today. We will tell you whether a custom app is justified, which parts can be done with existing apps, and what a first version would include. If a private app is the right answer, we will say so — even when a public product would be more profitable for us.
Related reading
Frequently asked questions
How much does a custom Shopify app cost?
It depends almost entirely on scope. A focused private app with one integration is measured in days to a few weeks of work; a public app with billing, App Store review and support obligations is a multi-month project. The biggest cost drivers are integrations, two-way sync logic, admin UI complexity and historical data migration. Ask any Shopify custom app development company to break the quote down by these four items — a single flat number usually hides the risk.
Do I need a public app or a private app?
If the app only serves your store, build a private app: no App Store review, faster to ship, cheaper to maintain. Build a public app only if other merchants have the same problem and you are ready to support them with documentation, billing and ongoing Shopify API upgrades. Many teams start private and productise later, since the core logic usually carries over.
How long does Shopify App Store review take?
Plan for several rounds of review rather than a single pass. Shopify checks OAuth scopes, GDPR mandatory webhooks, billing, uninstall behaviour and whether your listing matches what the app actually does. Most feedback concerns permissions and edge cases, not features, so budget time for one or two fix-and-resubmit cycles before launch.
Can you take over an existing Shopify app or fix a broken one?
Yes. We regularly take over existing projects: auditing the code, fixing OAuth and webhook handling, updating deprecated API calls, adding monitoring, and then continuing development. You get a written assessment of what is safe to keep and what should be rewritten before any work starts.
Who owns the code you write?
You do. We work so that the client owns or has full access to the repository, and we document the setup so another team could maintain it. For our own products — ZohoSync, Lookfit AI and SEO Products — you install and use them as products rather than owning the source.
Do you build apps that connect Shopify to Zoho, ERP or a 3PL?
Yes, that is one of our most common builds. We sync customers, products, stock and orders between Shopify and Zoho CRM, ERP or warehouse systems in real time, with retries and logging so a failed webhook does not silently lose an order. ZohoSync is our ready-made version of the most requested Shopify-to-Zoho CRM sync.
Have a workflow Shopify cannot do out of the box?
Tell us the process, the systems it touches and the hours it costs you each week. We will reply with an honest view: build a custom app, install an existing one, or leave it alone.