// services / custom_apps

If you can describe it, we can build it.

Shopify apps, web apps, and mobile apps, with or without AI. We build, deploy, test, and maintain on a scalable stack, for commerce and non-commerce businesses alike. Nineteen years of shipping, and a shelf of our own apps on the Shopify App Store to prove it.

Scope my appSee our apps
apps-work/work-01.jpg
Shopify

Add a headline here

A short description of the build: the problem, the platform, and the result.

apps-work/work-02.jpg
Mobile

Add a headline here

A short description of the build: the problem, the platform, and the result.

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Custom

Add a headline here

A short description of the build: the problem, the platform, and the result.

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Web

Add a headline here

A short description of the build: the problem, the platform, and the result.

4.9★608 Shopify reviews
App Storepublished apps
Web+ mobile
19 yrsbuilding software
End–to–endbuild to maintenance
// what kind of apps does KLoc build?
KLoc builds custom Shopify apps, web apps, and mobile apps on a scalable tech stack, for commerce and non-commerce businesses. Public or private, with or without AI. We handle design, build, deployment, testing, and maintenance, and we publish our own apps on the Shopify App Store, so the capability is proven, not promised.
// what_we_build

Commerce, mobile, web. AI optional, quality not.

From a private Shopify app for one store to a public app for thousands. From an internal tool to a customer-facing platform.

△

Shopify apps

Public and private apps that extend your store: bulk tooling, loyalty, discounts, inventory, fulfilment, and checkout extensions.

▤

Web applications

SaaS platforms, dashboards, portals, and internal tools on a MERN and Python stack. Real-time, secure, built to scale.

⛶

Mobile apps

Native and cross-platform iOS and Android with React Native and Flutter, integrated with your back office.

♢

AI features

Chatbots, recommendation engines, and agentic workflows, wired in where they move a real metric, not for the headline.

⟷

Integrations & APIs

ERP, OMS, PIM, CRM, payments, and logistics. Custom APIs that connect the systems that should have been talking.

♻

Deploy, test, maintain

The work does not end at launch. QA, cloud deployment, monitoring, and maintenance contracts with real SLAs.

// when_off_the_shelf_runs_out

The feature you need doesn’t exist yet. So we build it.

Every growing business eventually hits the wall of what apps and plugins can do. A workflow no tool supports, an integration nobody offers, data trapped where your team cannot reach it. That is where a custom app pays for itself.

01

Logistics, digitised

We built a custom Shopify app connecting stores with OCS logistics software, so orders, shipping, and tracking flow without manual handoffs.

02

Systems that finally talk

Two middleware apps connecting Shopify stores with omnichannel loyalty software, keeping points and rewards in sync across channels.

03

Tools for one job

Small to mid-sized custom apps built for specific client use cases, in India and abroad, where no off-the-shelf tool fit.

04

Deep integrations

ERP, OMS, PIM, CRM, payments, and logistics wired into Shopify through custom apps and middleware that hold up under real load.

// on_the_shopify_app_store

We don’t just build apps for clients. We publish our own.

Live, installable proof that we know how to ship and support real products at scale.

Live · discounts

Marketwise Discount Ninja

Flexible, market-aware discounting for Shopify. Run the right promotion for the right customer, without the manual setup.

view_on_app_store →
Live · loyalty

Marketwise Loyalty Ninja

A complete loyalty solution for Shopify. Points, rewards, and retention mechanics that turn one-time buyers into regulars.

view_on_app_store →
Live · AI visibility

LLMEO · Visibility across LLMs

Track and grow your brand’s visibility across ChatGPT, Gemini, Claude, and Perplexity, straight from your store.

view_on_app_store →
Live · merchandising

Section Store

A library of ready-to-use, customisable theme sections, so merchants can build richer pages without touching code.

view_on_app_store →
// built_for_real_use

Apps that solve operations, not just demos.

Our app work starts with a real business problem: a manual process that should be automated, a system that refuses to integrate, data your team cannot reach. We design for the workflow, build on a stack that scales, and stay on for maintenance.

AI goes in only where it earns its place, like a recommendation engine or a support copilot that moves a real number.

Scope your app →
// app.integrate({ shopify, erp, logistics })
connected · real-time sync

{
  "type": "public | private | embedded",
  "platform": "shopify / web / mobile",
  "stack": "MERN, Python, RN, Flutter",
  "ai": "optional",
  "lifecycle": "build > deploy > maintain"
}
// how_we_work

From problem to live app, in four moves.

A documented process run by senior engineers, with weekly progress you can see and a plan before any code ships.

01

Scope

We map the problem, the users, and the integrations, then agree costs and a delivery plan before the build.

02

Build

Delivered in sprints, with new software to view throughout and weekly progress meetings, so you watch it grow.

03

Test & launch

Full acceptance testing, then we go live together, with support through the transition so it lands smoothly.

04

Maintain

The relationship continues with maintenance contracts and SLAs for response time and issue prioritisation.

Weekly progress meetings, software you can see growAcceptance testing before anything goes liveMaintenance SLAs for response and prioritisationSenior engineers, never subcontracted
// selected_app_builds

Real apps, solving real operational pain.

Integration · Shopify-connected logistics

OCS: Shopify stores, wired straight into logistics.

We built a custom Shopify app that connects Shopify stores with OCS logistics software. Orders flow from the store into fulfilment, shipping and tracking sync back, and the manual copy-paste between systems disappears. A focused integration that does one important job and does it reliably.

“They felt like an extension of our team.”E-Commerce Manager, Pothys (Shopify Plus, 80K+ products)
Custom
Shopify app, built for the job
Connected
Shopify to OCS logistics
Less
manual work, fewer errors
// apps_we_have_built_for_clients

Custom apps that solve real business problems.

A sample of the work we have shipped for clients in India and abroad, from deep integrations to focused tools built for one job.

Integration · logistics

Shopify ↔ OCS Logistics

A custom Shopify app connecting Shopify stores with OCS logistics software, so orders, shipping, and tracking move without manual work.

Custom
Shopify app
Connected
to OCS
Less
manual work
Middleware · loyalty

Omnichannel loyalty bridge

Two separate Shopify apps built as middleware, connecting stores with omnichannel loyalty software so points and rewards stay in sync.

2
middleware apps
Omni
channel
In sync
in real time
ERP · sync

ERP & inventory sync

Real-time sync between Shopify and back-office systems, and virtual inventory tied to ERP, cutting manual reconciliation and errors.

Real-time
sync
ERP
connected
Fewer
errors
Catalogue · bulk

Bulk catalogue tooling

Bulk tag and metafield management that fills the gap Shopify’s native UI leaves, with smart filtering and audit logs.

Bulk
editing
Smart
filtering
Audit
logs
Marketplace · headless

Headless marketplace

A headless Shopify marketplace with maker profiles and custom subscriptions, plus a curated product discovery platform with smart search.

Headless
build
Custom
subscriptions
Smart
discovery
Custom · India & abroad

Purpose-built apps

Multiple small to mid-sized custom apps for specific client use cases, across India and international markets. If a tool does not exist, we build it.

Many
use cases
India
& abroad
Fit
for purpose

Need something no ready-made app does?

Tell us what you need →
// the_stack

Modern where it matters, proven where it counts.

We build on a scalable stack and support the full lifecycle, so the app you launch keeps running and keeps improving.

✓ Shopify & Shopify Plus✓ React & Angular✓ Node & Python✓ Java✓ MERN✓ React Native & Flutter✓ AWS & GCP✓ Docker & Kubernetes✓ REST & GraphQL APIs
Apps we publish on the Shopify App Store
Marketwise Discount NinjaMarketwise Loyalty NinjaLLMEOSection Store
// verified_reviews / 4.9_avg

The team brands call when it has to actually work.

★★★★★

Their deep expertise and ability to provide tailored solutions beyond standard implementations stood out. They felt like an extension of our team.

Pothys
Custom Shopify build
★★★★★

We had high ambitions and KLoc over-delivered. Every feature requirement met, within budget and on time.

Investment company, Sweden
Custom development
★★★★★

They tackled complex structure and payment issues with remarkable expertise, then stayed on to support it.

Varld
App & integration
// start_a_conversation

Got an app in mind? Let’s scope it.

Need a custom build?

Shopify app, mobile app, web platform, or all three. Tell us the problem and we’ll tell you the smartest way to build it.

Scope my app
senior engineer on the call

Have an app that needs help?

Inherited a build or stuck on maintenance? We audit it, fix what needs fixing, and run it under SLA.

Get an app audit
no obligation · clear next steps

Questions, answered.

What types of apps does KLoc build?+
Custom Shopify apps (public and private), web applications, and mobile apps for iOS and Android, on a scalable stack. We serve commerce and non-commerce businesses, from internal tools and SaaS platforms to customer-facing apps. AI is included where it genuinely helps, and left out where it does not.
Do you have apps on the Shopify App Store?+
Yes. Our published apps include Beacon: Smart Market Discount and Marketwise Loyalty Ninja, with LLMEO, our AI visibility tool, coming soon. Publishing and supporting our own apps is proof we can ship and maintain real products at scale.
Can you integrate my app with ERP, CRM, or other systems?+
Yes. We design custom APIs and middleware to connect Shopify and your apps with ERP, OMS, PIM, CRM, payments, and logistics systems. Real-time sync and clean data flow are a core part of what we do, as in our Odoo to Shopify and virtual-inventory builds.
Do you maintain apps after launch?+
Yes. The work does not end at go-live. We offer QA, cloud deployment, monitoring, and maintenance contracts with SLAs for response time and issue prioritisation, or we can work task to task as needed.
Can you take over an app someone else built?+
Yes. Many clients come to us to stabilise or extend an app built elsewhere. We audit it first, fix what needs fixing, then maintain and improve it with senior engineers.