App development
App development for iOS, Android and web
Mobile and web apps, from the first working version to the stores. We settle where your users actually work before we pick the technology. Fixed price up front, and the code stays yours.
Clients rate us 4.9
- Live on iOS & Android
- Fixed price up front
- You own 100% of the code
Built for, among others
The problem
What gets in the way
Most companies that ask for an app do not need two separate native apps.
Native, cross-platform or web app
Three developers, three opinions, and the most expensive option sounds most convincing. You want to know what suits your users before a line of code exists.
The work happens outside the office
On the road you scribble something on paper and type it in again that evening. You do that work twice, and it decides how many clients you can handle in a week.
The app sits apart from your systems
An app that keeps its own data and talks to nothing else gives you a second set of records. What goes in should land in your existing tools by itself.
Going live is not the finish line
An app left alone for a year crashes on a new phone or drops out of the store. Apple and Google change their requirements and someone has to keep up.
How we look at it
They need one place where the work gets done without anything being retyped afterwards. So we start with the device and the situation: a phone on the road, a tablet inside a house, or a screen at a desk. Only after that do we choose native, cross-platform or a web app.
Read more
If a web app in the browser will do, you will hear it from us. We listen first to what you want to achieve now and where you are heading, then pick the technology to match.
What we build
How we help
We look at where your users are: on the road, on site or at a desk. That decides whether it becomes an app per platform, one app for iOS and Android, or a web app. The choice is fixed before we build.
Besides the app we build the system underneath and the connections to what you already use, including offline use and push notifications.
The design follows the place where the app is used. Someone working on a tablet in the field taps options and doesn't have to type.
We take care of the store listing and steer the app through Apple's and Google's review, on accounts in your name. After that, crash and usage tracking show you where people get stuck.
New iOS and Android versions, changed store requirements and further development can sit with us or with you, because code and documentation are yours.
What we built
See the latest from Topdevs
Simply - AI-Native CRM & ATS
Simply's AI-native CRM and ATS, built by us from data model to hosting. One platform with an AI agent, a unified inbox, matching and workflows, used by thousands of recruiters every day.
Reviews
What our clients say about us.
4.9 · based on client reviews
From spreadsheet to a real platform
“They turned our scattered spreadsheets into a full real-estate platform, including WWS calculations and an investor portal.”
Philippe van der MarkMastoneThought along, delivered fast
“A team that thinks along and delivers: quick to act, cleanly shipped and exactly what we had in mind.”
Nico WerkmanDecathlonA beautiful website our members love
“TopDevs delivered a beautiful, fast website where our members and new runners find their way around right away.”
Huub SteinmannLoopgroep Grave
Our approach
From idea to working software in four phases
Every project runs through the same four phases, so you always know what's happening, what comes next and what it costs, from first call to live software, usually in weeks rather than months.
- 01Phase 1Free intake
Understand & analyse
Everything starts with a good conversation. We map your goals, processes and the bottlenecks worth solving: no sales pitch, just an honest read on where the biggest win sits.
- 02Phase 2Free blueprint
Blueprint & quote
We turn the analysis into a blueprint: a clear plan showing exactly which steps we'll take and why, paired with one fixed quote. You know up front precisely what we build, what it costs and when it's done, so the bill can't surprise you afterwards. And that blueprint is free and without obligation.
- 03Phase 3Prototype in days
Build, test & deploy
Then we build, in short iterations. You see a working prototype in days and a finished product in weeks. We work on a modern, AI-native and secure stack, with data protection and GDPR in mind from day one.
- 04Phase 4100% your code
Implement & optimise
We launch, hand over the full codebase and keep improving on your terms. You get 100% ownership of the code we write. Hosting and maintenance are optional.
What you always get
Fixed price
Agreed up front.
100% code ownership
Your code, fully yours.
Live in weeks
Prototypes in days, finished in weeks.
Modern & secure
A scalable stack that always integrates with the latest tech. Secured by our in-house cybersecurity experts.
Tools & tech
We build on the tech that fits you
We build on the technology that fits you best. If you already work with a certain stack (.NET, PHP or something else), we simply build on it. Starting fresh? Then we draw on years of experience to pick the technology that's strongest for your situation. You only migrate when it gains you something.
- A working app you can hand to real users, not a clickable demo
- The full source code with technical documentation and a clean handover
- Publication in the App Store and Play Store on developer accounts that are yours
- Integrations through APIs with the systems and data you already run
- A fixed price agreed up front, no open ends
- Optional maintenance after launch: OS updates, store requirements and further development
Faster Delivery. Fixed price. Forever your code.
Traditional agencies make software feel risky. Topdevs makes the project clear before we build.
Frequently asked questions
Native, cross-platform or web app: how do you choose?
We look first at where and how the app gets used. If it has to work offline, send push notifications or use the camera, you want it installed on the device. In most cases we then build one codebase for iOS and Android. If there is always a connection and people work on a tablet or laptop, a web app is often enough. And we will say so.
Does the app work without an internet connection?
It can, and for a lot of apps that is the whole point. We then build on-device storage that survives a dropped connection. If what was captured locally also has to travel back to the server once the connection returns, we build that sync on top. How far you take that we decide together, because working fully offline costs more build time than handling the occasional flaky signal.
Do you handle publication in the app stores as well?
Yes. We build the releases, take care of the store listing and the screenshots, and guide the app through Apple and Google review. Expect a first submission to come back rejected now and then, for something like a missing privacy policy, a permission explained too thinly or a test account the reviewer cannot get into. We fix it and resubmit. After launch, updates go out as numbered releases, with crash monitoring on top so you see when something breaks.
How does the app talk to our existing systems?
Through the backend we build underneath it. The app never knocks on your packages directly, it talks to an API layer of its own, and that layer handles the integrations, the permissions and the synchronisation. On a phone that last part is the real work: a device goes offline, two people edit the same record, and the app has to know which version wins. What someone records in the field is then the same record that gets checked at the office later.
Whose name do the app and the store accounts sit under?
Yours, both of them. We register the Apple and Google developer accounts under your company name from the start, along with the signing certificates and the store listing itself. An app parked in our account is not really yours in practice: moving it to another party would have to go through us. The same goes for the source code, which you get in full, with technical documentation and a handover.
What happens after launch with OS updates and store requirements?
Maintenance on an app is more concrete than it sounds. It means lifting the iOS and Android SDKs to a new major, rebuilding against the target version Apple and Google require at that moment, renewing expired certificates, and updating the privacy labels in the store whenever something about the data flows changes. We can take that block on and fold further development into small releases. Prefer to do it yourself or with your own team? That works too, because you already hold the code and the documentation.
Contact
Ready to build?
Send us a message or book a call straight away. We're happy to think through the best approach with you.
