Custom applications
Custom application development
Software built around the way you work, not the other way around. A fixed price agreed up front, 100% ownership of the full source code, and AI only where it genuinely saves time.
- Fixed price up front
- You own 100% of the code
- In-house cybersecurity specialist
In short
You want custom software when off-the-shelf tools force you to bend your process to fit them. We build the application around the way you already work: exactly the logic, integrations and screens you actually need. You pay a fixed price agreed up front, and the complete source code is and stays yours.
What gets in the way
Off-the-shelf software is fine right up until your process stops fitting the boxes. Then you start building workarounds in Excel, retyping the same data twice, or paying for twenty features you never touch. Custom flips that around. The application is built around the way you already work, with only the logic and the screens you genuinely use. At Mastone a full day's task shrank to a few clicks. At Peters the evening retyping at home disappeared. At Planit roughly 40% of the daily consultancy work is now automated. We are honest about when custom is the wrong call: if an existing package will do, we say so. We think along with you: we listen first to what you want to achieve now and where you are heading, then choose the technology to match, for the most scalable and powerful result that is cost-efficient at the same time.
Your process doesn't fit standard software
You calculate in Excel, copy data between tools, or keep a shadow administration because the package doesn't quite do what you need. Every month that costs hours and lets errors creep in.
Work gets done twice
Notes taken on site, then retyped at home into a report. A calculation you check by hand. Work that should be done once and well, not twice and half.
You're locked to one supplier
Dated software no one develops any more, or a builder who keeps the source code under lock and key. Want to change something and you can't move, while the costs pile up.
Open-ended quotes
Build projects that start with an estimate and end with a bill you didn't see coming. You want to know up front what it costs and what you get.
What we build
How we help
Map your process first, then build the app
We don't start with screens, we start with how you work: which steps, which decisions, where it goes wrong. We draw the application around that, so the software follows your way of working instead of the reverse.
Integrations with what you already use
Your app doesn't sit on an island. We connect it through APIs to the tools, databases and systems you already run, so data lands in the right place automatically and you stop entering anything twice.
AI where it genuinely helps
No AI for the sake of AI. But a searchable archive, automatic classification or smart text generation when it provably saves hours. Think thousands of documents made searchable in seconds, with source citations back to the original.
Documents and reports in one click
Calculation results, reports or invoices the app generates itself. An advisory .docx and its matching invoice in a single click, or an online brochure with a shareable link, straight from your own data.
Your own code plus documentation
The full source code is yours, with technical documentation and a clean handover. No vendor lock-in: you can continue at any time with your own team or another party.
Proof
We have built this
Real projects we can name.
Mastone
Real estate
From spreadsheet to a full real-estate platform with WWS scoring and an investor portal.
100+ rules
Complexity
Full platform
Type
Peters Bouwadvies
Building inspection / Construction
Tablet-first inspection software that captures findings on-site and turns them into .docx advisory reports and invoices.
Tablet-first
Device
.docx reports
Output
Planit Consulting
Planning consultancy
An AI chat that makes 18,429 planning documents searchable, with source citations.
18,429
Documents
95,592
Chunks
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.
- 01 Phase 1 Free 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.
- 02 Phase 2 Free 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 — no open ends, no hourly billing, no surprises afterwards. And getting that blueprint is completely free, no obligation.
- 03 Phase 3 Prototype 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.
- 04 Phase 4 100% 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 — no lock-in, no licensing games. Hosting and maintenance are optional, never required.
What you always get
Fixed price
Agreed up front, never an open end.
100% code ownership
Your code, fully yours, no lock-in.
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 technology that fits you best. Already working with a certain stack — whether that's .NET, PHP or something else — we simply build on it. Starting fresh? We draw on years of experience to pick the technology that's strongest for your situation. No forced migrations, no tech for tech's sake.
What you get
- A working application whose code is fully yours
- Technical documentation and a clean handover to your team
- Integrations through APIs with your existing tools and systems
- A fixed price agreed up front, no open ends
- An optional maintenance and further-development arrangement after delivery
Our promise
Your software stays yours
- Full code ownership The full source code is and stays yours, documented and ready to hand over.
- No vendor lock-in Stop working with us and your system keeps running. Any developer can pick it up.
- Fixed price up front You get a no-obligation blueprint and quote up front: no open-ended billing and no surprises afterwards.
- Security in every layer We build security-by-design, with a specialist in-house.
Frequently asked questions
When is custom better than an off-the-shelf package?
Custom pays off the moment you have to rebuild your process to fit a package, or when you stay stuck in Excel and loose tools because the standard product doesn't quite do what you need. If your way of working fits an existing tool fine, we say so. Custom isn't a goal, it's a choice that only makes sense when it saves time or errors.
What does a custom application cost?
It depends on the scope, but you always get a fixed price agreed up front. No hourly billing that runs on forever. We map your process first, break it into pieces, then quote for what you genuinely need. Want to start small? You can do that as an MVP.
How long does it take to build a custom app?
Smaller applications often go live within weeks; larger projects in a fraction of the usual time. We work AI-native and in short iterations, so you see working versions quickly instead of waiting months for one big delivery.
Who owns the code when you build the app?
You do. You get the full source code in hand, with documentation and a handover. No vendor lock-in: you can continue at any time with your own team or another party. We keep nothing locked away.
Can the app connect to the tools we already use?
Yes. We connect your application through APIs to your existing systems, databases and software, so data ends up in the right place automatically and you don't enter anything twice. Exactly which integrations you need is something we settle while mapping your process.
Can we start small with an MVP?
Absolutely. We often build an MVP first: the core of the application that solves the main problem, so you test it in practice before expanding. If it works, we keep building on the same codebase in iterations. If it doesn't, you've lost very little.
Ready to build?
Book a no-obligation call — we'd love to think through the best approach with you.
Book a call