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For founders and companies with a platform idea

Marketplace and online platform development

Do you have an idea for connecting people who offer something with people looking for it? Craftspeople with customers, tutors with students, sellers with buyers. We help you validate the idea and build a platform where both sides find each other.

You don't need to know whether you need a website or a mobile app. Tell us who you want to connect and how you want to earn from it.

A phone with a map of local businesses on an evening street

Sound familiar?

You don't know where to start

The idea is in your head, but you don't know what to build first or what it will cost.

Chicken and egg

Without sellers there are no customers, and without customers sellers won't join.

Fear of an expensive mistake

You don't want to spend your savings on a platform nobody uses.

The big players are everywhere

You can't beat global portals at everything. You need the niche where you win.

What your platform will do

Profiles and listings

Sellers or providers sign up and add a listing in minutes.

Search and map

Customers find what they want by category, price or distance.

Contact or order

Messages, enquiries, bookings or direct purchase — depending on your model.

Payments and commission

Customers pay through the platform and your commission is deducted automatically.

Reviews

Ratings that build trust on both sides.

Platform management

Approving listings, resolving disputes and seeing how the platform grows.

Website or mobile app? We'll work that out

We don't expect you to answer this. It depends on how both sides will use the platform — sellers often on a computer, customers often on a phone.

The usual start is one part (for example the web), with a mobile app added as the platform grows. The design shows what you need now and what can wait.

Curious about the differences? Read our web vs. app comparison

We are building a platform that connects businesses with people nearby

We are preparing a platform that connects local businesses and their offers with people nearby — from presentation through search to direct contact. It is built in two-week cycles and the client tries every new version right on their phone.

More about the project

What it costs

Indicative prices from our calculator. You get an exact figure after the first conversation, once we know your scope.

  • Idea validation and screen design (Pitch Design)€179
  • Web platform (works on phones and computers)1,990 – €4,990
  • Mobile app for iPhone and Android4,000 – €9,000
  • Running, maintenance and new featuresfrom €299 / month

Prices exclude VAT. We calculate running costs (such as video hosting or payment fees) up front based on your number of customers.

In detail: how much does a mobile app cost

How working with us goes

  1. 01

    A free conversation

    Tell us what you want to offer your customers and what is holding you back today. No technical brief needed.

  2. 02

    Design before development

    We show you how the solution will look and work before any money goes into programming.

    What is Pitch Design
  3. 03

    Built in parts

    Every two weeks you get a new finished part to try straight away. No black box.

  4. 04

    Launch and growth

    We help you launch and keep looking after it — fixes, updates and new features.

When a ready-made tool is enough

You don't need to build a full platform to validate the idea. A simple page, a form and connecting people by hand is often enough — if it works, you know it is worth building. Your own platform makes sense when:

  • you have proven demand on both sides,
  • connecting people by hand no longer keeps up,
  • you need payments, commissions and reviews that can't be improvised,
  • off-the-shelf marketplace templates don't fit your model.

Frequently asked questions

How do I get both sellers and customers onto the platform?

You almost always start with one side and a narrow segment — one city, one category. In the design we decide together where to start so the platform gets going.

How will the platform make money?

A commission per transaction, a listing fee, a seller subscription or featured listings. We choose the model based on what your users are willing to pay for.

How much does a marketplace cost?

It depends on scope. It is sensible to start with a smaller version with the essentials — indicative prices are above, and you get an exact figure after a conversation.

Do I need a company and an investor?

No. Many platforms start as a side project. A solution design (Pitch Design) also helps you show the idea to investors if you look for them.

How long does it take?

We work in two-week cycles and you try every finished part straight away. A simpler first version can reach people within a matter of months. You get an exact timeline together with the price after the first conversation.

Other solutions

App for fitness coaches

Your workouts, programmes and bookings under your own name. Clients train without you and pay monthly.

Online course platform

Courses with lessons, quizzes and certificates under your brand. For teachers, schools and corporate training.

Custom booking system

Online bookings for a salon, studio or clinic — with reminders, deposits and class passes.

Restaurant table booking

Online table bookings with no per-guest fee, reminders against no-shows and your own guest database.

Loyalty app

A digital loyalty card, rewards and offers for regular customers — right on their phones, under your name.

Custom business app

Tasks, forms, approvals and overviews for your people — instead of spreadsheets, emails and paper.

Field service app

Service reports on a phone: photos, customer signature, materials and time — straight to invoicing, no paper.

All solutions

Have a similar idea? Tell us

A few sentences about you and your customers are enough. You don't need a technical brief or to know whether you need a website or an app.

Custom Marketplace and Online Platform Development | Grow-App