---
title: "Services: custom online store development - Slap Apps"
canonical_url: "https://slap-apps.de/en/services"
last_updated: "2026-11-10T13:13:22.052Z"
meta:
  description: "Concept, prototype, development and support from a single source: Slap Apps builds custom online stores for brands that need more than a store builder."
  "og:description": "Concept, prototype, development and support from a single source: Slap Apps builds custom online stores for brands that need more than a store builder."
  "og:title": "Services: custom online store development - Slap Apps"
---

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# Services for custom online stores

All services for your custom online store at a glance: from concept and prototype to development and support after launch.

[Get in touch](https://slap-apps.de/en/contact)

Upgrade your store

- Custom CMS
- Complex user flows
- Product configurators
- Seamless checkout
- Better customer experience

1:1**clickable prototype**

## Concept: planning, UX design and prototyping

We deliver design systems and clickable 1:1 prototypes. We use them to validate your store with real customers and work our way step by step towards what works.

100%**as designed**

## Store development: infrastructure, security and launch

Now we build: your store is implemented exactly as it was developed in the concept phase. Secure, fast and well thought out.

From day 1**after launch**

## Support: optimization, maintenance and growth

After launch we support the further development of your store system: new features, performance optimization and fast help with security issues.

## Our first 5 weeks

![Hand holding a smartphone showing a custom online store](https://slap-apps.de/cdn-cgi/image/w=640,f=auto/http://assets.slap-apps.de/slap-apps/e-comm/img/cta-smartphone-demo.png)

01

### Kick-off

Goals, numbers, audience: we get to know your business.

02

### Concept

Prototype and all key flows: the MVP of your store.

03

### Iteration

Fine-tuning with more flows, more clickable parts and more real content, until your vision feels tangible.

04

### Development

We build in parallel to the concept phase and adapt right away.

05

### Roadmap

A clear roadmap to launch. No surprises.

## Planning, design, validation and development from a single source.

- ### Limitless possibilities

  Features, brands, internal tools: we deliver everything around your store, not just what your customers see.
- ### Living business value.

  We understand business models and only build what gets your added value across.
- ### We stay with you.

  After launch is before launch, because that is usually when things really get going. We optimize that path together with you.

## All services for your online store at a glance

- ### Store infrastructure

  We plan and set up CMS, store system, mailing and more together with you.
- ### Prototyping

  We build a clickable 1:1 prototype with all custom features.
- ### UX validation

  We test your features and the store with your customers before development starts.
- ### Store development

  Your store is built exactly as it was planned and validated. No compromises.
- ### Store security

  Modern, secure architecture instead of outdated PHP plugins and known vulnerabilities.
- ### Brand design

  When needed, we get your brand ready for your online store.
- ### Internal tooling

  Smart internal tools that simplify the daily operations of your store.
- ### Conversion optimization

  More revenue through conversion optimization with tracking and targeted UX improvements.

3D · B2B · Shopify**in detail**

## Specialized services in detail.

For some topics we go deeper. Here you find all the details.

- [3D product configuratorCustomers build their own product in 3D, with live pricing and direct handover to production.](https://slap-apps.de/en/services/3d-configurator)
- [B2B storeBusiness customers order on their own, with their own prices, company accounts, invoice payment and ERP integration.](https://slap-apps.de/en/services/b2b-store)
- [Shopify alternativeShopify, Shopify Plus or a custom store? An honest comparison of when switching pays off.](https://slap-apps.de/en/services/shopify-alternative)
- [Shopify migrationFrom Shopify to a custom online store, without losing revenue or rankings.](https://slap-apps.de/en/services/shopify-migration)
- [Shopify cost calculatorFree tool: what your Shopify store really costs over 3 or 5 years.](https://slap-apps.de/en/shopify-cost-calculator)

## **Ready, set - go?**

Let’s get started today and talk about your project. Remember: your products can do more.

[Get in touch](tel:+491738027610) [Send a request](https://slap-apps.de/en/contact)

![Smartphone showing the login of a custom store app, held by a woman in dim light](https://slap-apps.de/cdn-cgi/image/w=1280,f=auto/http://assets.slap-apps.de/slap-apps/e-comm/img/cta-smartphone-demo.png)