BUILD · Mobile app

A mobile app built around how it's used.

When your customers or your team need a dedicated phone experience, we design the app: screens, development, testing on iOS and Android devices, then help with publishing on the stores. In Brussels and across Belgium.

Book a 20-min call

The situations we handle

  • Your customers come back often: an app saves them time
  • A field team that needs a tool in their pocket
  • A service to offer on phones, with notifications or payment
  • An app idea to scope before you commit

What your app includes

The scope is written in the quote: what isn't listed isn't built. That avoids surprises on both sides.

Included
  • The features listed in the quoteEach one is described before we start.
  • Screen designMock-ups approved by you before development.
  • DevelopmentDelivered in batches, so you see it progress.
  • Testing on 4 devicesTwo recent iOS devices and two recent Android devices.
  • Help with publishingKayo guides you through the App Store and Google Play.
  • 30-day warrantyFixes for bugs attributable to Kayo, from delivery acceptance.
Not included
  • Developer account feesApple and Google: accounts opened in your name, fees paid by you.
  • Features not listedAnything extra goes through an amendment or a priced upgrade.
  • A back office not plannedAn admin area is an option, priced separately.
  • Store approvalApple and Google decide: Kayo can't guarantee it.

How the project runs

  1. 01Brief, quote and depositSigned brief, quote and terms accepted, then deposit: nothing starts beforeWritten approval
  2. 02Functional scopingWe define what the app must do, for whom, and what goes into the first version.
  3. 03Mock-upsThe screens, approved by you before development starts.Written approval
  4. 04Development in batchesYou see the app progress, batch after batch.
  5. 05TestingYou test on a test environment, with your own test users.
  6. 06AcceptanceSigned report, deemed accepted after 5 business days with no specific issue reported, or as soon as you use the deliverables.
  7. 07BalancePaid after acceptance: store submission only happens after.
  8. 08PublicationSubmission to the App Store and Google Play, with Kayo's help.
What you provide
  • Your Apple and Google developer accounts, in your name
  • The app's content
  • Your approvals at each planned step
  • A few test users

Approvals are given in writing: an email or a message is enough. As soon as Kayo processes personal data on your behalf, a data processing agreement (DPA) is concluded with the quote.

An app, in practice

A typical example of a journey inside an app. No Kayo app is published yet, so we cite no project.

Example

Booking a class from your phone

  1. OpeningThe customer opens the app and signs in with their account.
  2. ChoiceThey browse the schedule and pick a class.
  3. ConfirmationThe booking is saved and confirmed on screen.
  4. ReminderA notification reminds them before the class (option).
Fictional example, for illustration only. The real screens and features are defined with you during scoping.

Budget

  • Mobile app · from €4,500For the simplest scope.
Options priced separately
  • Back office
  • Notifications
  • Built-in payments
  • Tablet version
Third-party costs, paid by you
  • Apple and Google developer accounts
  • Third-party services (database, notification sending)
What makes the price vary
  • The number of screens
  • The features chosen
  • The options chosen

Starting price: the final price is the one in the signed quote, depending on features, content and the number of screens. From €3,000: 40% on accepting the quote, 30% on approval of the mock-ups (or, if there are none, at the milestone agreed in the quote), 30% before going live. No VAT is charged (VAT exemption).

FAQ · Mobile app

Your questions. Our clear answers.

How much does a mobile app cost?

From €4,500 for the simplest scope, excluding options and third-party costs. The final price depends on features, content and the number of screens, and is the one in the signed quote. No VAT is charged (VAT exemption).

Do I really need an app, or is a website enough?

A mobile-friendly website is often enough to present an offer and be found. An app makes sense when use is frequent, with an account, notifications or phone features. We look at it with you during the 20-minute call, and tell you if a website is enough.

Will the app work on iPhone and Android?

Testing covers four recent devices, two iOS and two Android. The target platforms are specified in the quote, along with the features.

Who publishes the app on the stores?

Kayo helps you publish. The Apple and Google developer accounts are opened in your name, and their fees are paid by you. Submission happens after the balance is paid. The stores make the final call: we can't guarantee approval.

And after publication?

The 30-day warranty covers bugs attributable to Kayo. Updates linked to changes in mobile systems, or new features, are handled through maintenance (EVOLVE pillar) or a quote.

Can I start with a simple version?

Yes, it's even recommended. The first version holds the essentials; later features are added afterwards, priced separately.

Going further

In 20 minutes, we talk about your project and a possible next step. A rough idea is enough: we help you sharpen it.

Book a 20-min call