Service
Mobile apps for iOS and Android, designed, built, and looked after by one team
We design, build, and launch mobile apps for iPhone and Android, then keep them fast and up to date. You get an app people keep on their home screen, connected to your website, customer records, and payments.
- 1,200+ clients helped
- Building since 2010
- 15 services, one team
- 50+ technologies
At a glance
What we build
We design and build apps for phones and tablets, from the first idea through the app stores and ongoing updates.
Problems we solve
Teams are unsure which approach to choose, how long it takes, what the app stores require, and how to keep an app working as phones and systems change.
Who we serve
Businesses launching a first app, and teams whose current app is slow, outdated, or hard to maintain.
How to choose
Choose by audience and needs: a native app for the deepest phone features, a cross-platform app to cover both major phones at once, or a web app when an app store is not needed.
- 1,200+Happy clients
- 1,500+Projects delivered
- 100+Engineers and designers
- 20+Countries served
- 22Certifications
Every project gets its own squad from our 100+ engineers and designers: a project lead, a product designer, and engineers matched to your stack, with the same people from kickoff to launch.
The choice
Apps that earn a place on your customer's phone
People carry their phones everywhere, so an app can feel like the obvious answer. Sometimes it is. An app can send notifications, work without a connection, use the camera or location, and sit on the home screen.
But an app is also a product to look after. It must be updated whenever phones change, reviewed by the app stores, and supported on many devices. A well-built mobile website, or an installable web app, is sometimes enough.
We help you decide honestly. If an app is right, we help you start small, learn from real users, and grow from there.
Choosing an approach
Native, cross-platform, or web app?
There are three main ways to build for phones. They trade off depth, cost, and reach.
What matters most for your app?
Choose this when
You need the best speed and the deepest use of phone features, or you are building only for iPhone or only for Android.
- What you get
- The smoothest feel and full access to the phone. Typically built with Swift for iPhone and Kotlin for Android.
- Keep in mind
- Two apps to build and maintain if you need both phones, so it costs more.
Choose this when
You want one app on both iPhone and Android, with a shared team and a shared plan.
- What you get
- One build for both phones, quicker and cheaper to start. We use Flutter and React Native.
- Keep in mind
- A few very specialist features may need extra native work.
Choose this when
You do not need the app stores, or want to test an idea quickly, and the features are modest.
- What you get
- A website that can be added to the home screen, built once for every device.
- Keep in mind
- Less access to phone features, and less presence in the app stores.
How it works
What is inside a mobile app
An app is more than the screens. Most of the useful work happens behind the scenes.
Plan for both sides
The phone app and the system behind it need to be designed together.
Keep information safe
Sign-in and permissions protect what the app shows and stores.
Learn from use
Reports on usage and crashes guide what to improve next.
What is inside a mobile app
Layers from top to bottom. The app on the phone, supported by Notifications: Messages that reach the phone's lock screen.; The system behind the app, supported by Sign-in: Safe login, including fingerprint or face.; Your other tools, supported by Usage and crash reports: Show what people use and what breaks..
- The app on the phoneScreens, buttons, and everything the person touches.
- NotificationsMessages that reach the phone's lock screen.
- The system behind the appAccounts, rules, and the information the app shows.
- Sign-inSafe login, including fingerprint or face.
- Your other toolsPayments, customer records, email, and maps.
- Usage and crash reportsShow what people use and what breaks.
What we build
Apps we build
Customer apps
Apps for ordering, booking, tracking, or loyalty that make doing business with you easy.
Staff and field apps
Apps that let teams work away from a desk: inspections, deliveries, and job updates.
A first version to test an idea
A small first version, often called an MVP (minimum viable product), to learn what people really use before you invest more.
Apps for Android
Apps designed for the range of Android phones and tablets.
Apps on both phones at once
One shared build that runs on iPhone and Android.
Rescue and modernization
Bringing an old, slow, or abandoned app up to date, or replacing it in stages.
After launch
Keeping an app healthy
Launch day is the start. Phones and operating systems change every year, and an app that is not kept up to date eventually stops working well. We plan for updates from the start and agree who looks after the app once it is live.
Keeping up with phones
- Apple and Google release new phone software every year.
- We test and update so your app keeps working.
Fixing and improving
- Crash reports show what breaks.
- Usage data shows what people actually do.
Store rules
- Both stores have review rules that change.
- We prepare each release so it passes.
Support
- A clear way for people to report problems.
- Agreed response times for urgent fixes.
How a project runs
From first idea to the app stores and beyond
An app is never finished at launch. It moves from scope to design, build, test, and release, then keeps changing as phones and customers do.
Find the first version
We decide the few things the first release must do well, and what can wait.
What it produces
- Scope of the first version
- Success measures
Design
We design screens and flows, and test them with real people on a clickable model.
What it produces
- Clickable design
- Feedback from test users
Build in steps
We build in short rounds, so you can try working versions early.
What it produces
- Working app each round
- Connection to your systems
Test on real phones
We test on a range of devices, including older ones, and check speed, safety, and accessibility.
What it produces
- Device test results
- Security checks
Release and learn
We prepare the store listings, release, and watch how people use it.
What it produces
- Store release
- Usage and crash reports
Keep improving
We ship fixes and new features, and keep the app working as phones and store rules change.
What it produces
- Regular updates
- Support with agreed response times
Choosing the right approach
How we pick the right approach
We start from how often your customers will use it. An app wins when people return often or need the phone's camera, location, or notifications. For one-off use, a fast web app gives the same result for less.
We recommend the format that fits your customers and budget, then build it properly.
- Your visitors will rarely come back.
- A mobile website would do the same job.
- You have no one to look after the app after launch.
Technology
The technology behind our apps
Our engineering choices on native and cross-platform apps and the systems behind them, written for the people who will own the app after launch.
Flutter (written in Dart) and React Native let one team build for both phones. We also use Kotlin Multiplatform to share logic, and Ionic or .NET MAUI when they fit your team.
- A secure back end, built with the tools in our software service, or a ready-made platform such as Firebase.
- Sign-in, notifications, and offline use designed from the start.
- Automated tests and a release pipeline for each store.
Pricing and timelines
What a mobile app costs
Every project is quoted in writing after a short call. These ranges show where most projects land, so you can plan before you talk to us.
MVP app
The core features on iPhone and Android, ready to test with real users.
Typical range
$10,000 to $20,000
2 to 4 weeks from approved scope
Business app
Accounts, notifications, payments, and an admin panel for your team.
Typical range
$20,000 to $35,000
4 to 6 weeks from approved scope
Marketplace or on-demand app
Two-sided apps for customers and providers, with matching, payments, and tracking.
Typical range
$30,000 to $50,000
6 to 8 weeks from approved scope
Complex or enterprise app
Offline use, hardware, heavy integrations, or strict security requirements.
Typical range
$50,000 to $60,000+
8 weeks from approved scope
The timeline starts once the scope is approved and we have what we need from you.
What moves the price
- iPhone, Android, or both
- Number of screens and features
- Back end and admin panel
- Integrations and hardware
Not sure which fits? Tell us what you need and we will send a fixed quote and timeline for your project. Read the full cost guide.
Get a quoteSelected work
Mobile App Development projects we have delivered
What clients say
In our clients' words
Luis from DECHY helped us fix how technicians close visits on-site. They can add photos and parts before leaving the property, and I no longer get a pile of paperwork at night.
Sofia AlvarezField Service Operations ManagerSummit Property MaintenanceHome and Field Services During busy weekends, staff were leaving the shop floor to check stock on a desktop.
Olivia BrooksRetail Store ManagerMarketRow RetailRetail
Common questions
Questions about mobile apps
How much does an app cost?
Most business apps cost $20,000 to $35,000, including accounts, notifications, and payments. A first version to test an idea can start from $10,000, and marketplace or complex apps cost $30,000 or more. Every quote is fixed in writing and covers design, testing on real devices, and app store release.
How long does it take?
Most apps take 2 to 8 weeks. A first version usually reaches the app stores in 2 to 4 weeks, and larger apps in 6 to 8 weeks. App store review adds a few days, which we plan into the launch date.
Do we need separate apps for iPhone and Android?
Not always. A cross-platform app can cover both with one build. We recommend native apps when you need the deepest phone features.
Who owns the app?
Ownership and licensing are agreed in writing before work starts. We aim for you to hold the code and the store accounts, so you are never stuck.
Can you fix or update our existing app?
Yes. We review what exists, find what is wrong, and either repair it or replace it in stages.
Will the app work with our other systems?
Yes. We connect apps to your website, customer records, and payments. See our integration service.
Have a different question?
Tell us what you are weighing up and we will answer it plainly.
Ask a questionAlready a client? Email support@dechytech.com
Tell us about your app idea
Describe who the app is for and what it must do. We will recommend an approach and a low-cost way to test it.