THE OPPOSITE AGENCY

Custom software built around the way you work

For companies stuck in Excel, project management and other off-the-shelf tools. Custom software solves your unique problems.

  • Working system in 6 weeks
  • Fixed price, no surprises
  • Free MVP to test
  • An estimate in 5 minutes
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More than 250+ systems built worldwide

★★★★★

“Flawless at scale”

Once a year we put our entire annual programme live. That's twelve months of events, all at once. You've got thousands of people on the site for seven days straight. So switching to a completely new website was nerve-wracking. Thanks to the prep from Quinten and the team it went flawlessly.
ISTA Global Tom Scott Director of Operations, ISTA Global
★★★★★

“Indispensable”

Quinten has been working with us for over a year now and his contribution is indispensable. He's improved our website and made it faster, automated processes in our CRM and managed our newsletters. Always communicates clearly and hits deadlines.
S&T Corporation Sofia Cristina Marketing Manager, S&T Corporation
★★★★★

“After 4 failed attempts”

In six years we tried four times to rebuild the website. Every time it stalled, until we met Quinten. He had mock-ups ready straight away, spoke our language, and when we wanted to accelerate halfway through he just rolled with it.
ISTA Global Mike Bindon Executive Director, ISTA Global
★★★★★

“Our clients are happy”

They designed our customer portal and our clients are really happy with it. Everything is easy to find and it just works nicely. Great to work with, thinks along well.
Eurocrane China Frances Dai Sales Manager, Eurocrane China
★★★★★

“Translated the ideas”

Quinten is a real professional who can translate ideas into the digital side really well. I'm honestly useless with tech but Quinten knew exactly what I meant. He also helped optimise the digital side, which helped with the sale of my company.
Your Expat Butler Mandy Heruer Owner, Your Expat Butler

Key features

Built around how you work

Because the software is built exactly around your workflow, needs and the way your business sets itself apart, your team works faster and with fewer errors than any off-the-shelf solution could deliver.

Gives your team clarity

A team that knows where it stands works better. People no longer need to remember what still needs to be done. That mental space goes toward better work, better decisions and fewer mistakes.

Grows safely with you

No worries about GDPR compliance, a big client sending a security questionnaire, or your company doubling in size. With custom software, encryption, access control, audit logging and scalability are set up exactly as your situation requires.

Makes your data visible

Your business produces data every day. Off-the-shelf software shows you a fraction of it. Custom software shows you everything you need, exactly the way you want to see it. Which clients are most profitable, where processes can improve, what works and what doesn't.

Now faster and more affordable with AI

A custom system used to take months and a six-figure budget. Not anymore. AI writes most of the code, and developers review and test every line. That saves 40% in costs and cuts the average build time.

Security & Management

You own the code

Everything we build is yours, on open source technology any team can pick up.

Built-in security

Encryption, access control and audit logging come standard. GDPR-compliant from day one, and ISO-compliant.

Proven infrastructure

The same technology as Salesforce and Slack. Automatic backups, security updates and 99% uptime.

Connects with current tools

Integrations with your accounting, CRM, email and payment platforms. Everything automatically in sync.

Let our experts QuintenMatthijsHilcoEarly build you a free demo.

  • A working system that follows your process
  • An honest assessment of whether custom software pays off for you
  • Insight into where your process loses the most time or revenue
  • A clear estimate of costs, timeline, and return on investment

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Track record

250+ Systems built
4.9 on Trustpilot
6 wk Avg. delivery
40% Lower costs through AI

We've built 250+ unique systems for nearly every kind of business process.

Client portals

Client portals

One place where your clients view invoices, upload documents and see where their project stands. No endless emails or scattered links. Everything together, under your brand.

Free demo
Client portals
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Custom CRMs

Custom CRMs

Off-the-shelf CRMs rarely match how you actually work. We build a CRM that does exactly what you need. Your pipeline, your fields, your workflow. Without features nobody touches.

Free demo
Custom CRMs
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AI automations

AI automations

Quotes that write themselves. Customer questions answered automatically. Data processed without anyone touching it. AI workflows that give your team hours back each week.

Free demo
AI automations
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Dashboards

Dashboards

Revenue, pipeline, team load and KPIs on one screen. Real-time, connected to the tools you already use. So you stop cobbling together reports.

Free demo
Dashboards
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Work management

Work management

Projects, tasks, deadlines and capacity in one system. Built on how your team works, not on the assumptions of an off-the-shelf tool.

Free demo
Work management
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You name it

You name it

Internal tools, booking systems, API integrations, data pipelines, admin panels. If it can be built, we've probably built something like it. Tell us what you need and we'll figure out the rest.

Free demo
You name it
Request free demo

Why The Opposite Agency?

Free

Free working demo.

We build a working demo on your own data. No obligations. You see exactly what the system does before you spend a thing.

Traditional agencies

Paid pilot up front.

Pay for a discovery phase before you see anything. Hours on the invoice while you don't even know if it's a fit.

Speed

Live within 6 weeks.

Within two weeks there's a working demo on your data. Four weeks later it runs in production. No months of planning, no endless projects. Six weeks from start to live.

Traditional agencies

Six months of discovery.

Workshops, interviews and roadmaps. After half a year you have a PowerPoint. The actual building hasn't started yet.

Cost

Fixed price per project.

Every phase has a fixed budget, set up front. You see a working demo and a quote first. Then you know what you'll spend and what it returns.

Traditional agencies

Hourly billing with scope creep.

A quote that climbs during the project. Overruns, extra hours, arguments about billing.

Adoption

Easy to use.

The software is built around the way your team already works. They step in and get it, because it follows their own logic.

Traditional agencies

Train first, work later.

Thick manuals, mandatory training and a consultant to explain how it works.

Security

Secure and compliant.

Security sits in the architecture. Encryption, access control, audit logging and pentesting come standard. We build GDPR-compliant and guide you through ISO certification where needed.

Traditional agencies

Security as an add-on.

Encryption and audit logging billed extra. Compliance checks left until the end, often too late.

Future-proof

Built for the long run.

Proven, modern tech with a long shelf life. Your system scales from 10 to 10,000 users. We pick stacks with active communities, so there are always developers who can keep building on it.

Traditional agencies

Legacy stack within two years.

Built on frameworks that are trendy now but hard to hire for in a few years.

Ownership

Your code, your call.

Everything we build is open source, documented and transferable. Want to move on with another team tomorrow? You grab the code and go. We use standard technology any decent developer can take over.

Traditional agencies

Vendor lock-in.

Proprietary frameworks. Code you can't take with you, or docs only they can read. Moving on means months of migration.

Maintenance

We maintain everything.

We maintain what we build: security patches, bug fixes and integrations. If an integration breaks, we fix it. Your software stays up-to-date, secure and fast.

Traditional agencies

Delivery = end of contact.

Once it's live, you're on your own. Updates, security and integrations, you sort them or sign a new contract.

Partnership

We think in business outcomes.

We know what it takes to build a company. So we start with your question. We respond fast, stay honest and deliver what we promise. When it lands, we celebrate together.

Traditional agencies

Tech for tech's sake.

Choices made for the developers, not for the business. Reports on sprints, rarely on results.

Track record

Proven at 40+ companies.

From client portals to full automations. Browse our cases and speak to our clients. Every project starts with a free demo, so you see what we can do before deciding.

Traditional agencies

Pitch decks and promises.

Glossy cases, no names, no measurable numbers. References to projects that never went live.


TOA versus the alternatives

Custom software without breaking the bank or waiting forever.

Capability
TOA
No-code
SaaS
Freelancer
In-house
Traditional agency
Built around your process
Live within 6 weeks
Fixed price
Starting from €10k
Scales past 50 users
You own the code
Ongoing support
Security & compliance built-in
AI-driven development
Accessible expertise

Our experts, and friendly engineers.

Quinten van der Weijden

Quinten van der Weijden

Owner & Digital Strategist
Matthijs van Schuppen

Matthijs van Schuppen

Creative Strategist & Designer
Hilco van Leeuwen

Hilco van Leeuwen

UX/UI Designer & Branding
Early Jamanika

Early Jamanika

Back-end Developer

“We believe custom software doesn't have to be expensive, slow or complicated. We built an approach where AI does the heavy lifting and a small team stays in control. That means your software goes live faster, without compromising on security or quality.”

250+ Systems built
6 wk Avg. turnaround
3 Developers per project
40% Lower cost with AI


Where do you want to start?

FAQs

Your questions answered

Does quality suffer because of AI?

AI writes the first version of the code. A developer reviews, tests, and rewrites where needed. The same standards as manual work: code reviews, automated tests, security scans. The developer spends their time on the hard 20%, not routine work.

Is AI safe for our business data?

We don't train models on your data and don't send customer information to public AI services. AI is used during the build, not in the final product. The delivered software runs independently, without external AI dependency, unless you explicitly want that.

Six weeks seems short. What if something goes wrong?

By week two there's a working demo. If something's off with the scope, approach, or collaboration, you'll notice early. Every phase has a fixed budget and a clear end point. After each phase, you choose whether to continue.

What if you go out of business or I want to switch?

The code is yours, documented, built on standard open source. Any experienced developer can take it over. No proprietary frameworks.

Can such a small team build a serious system?

Three developers with AI deliver more than ten without. 250+ systems built, several with thousands of users. For large expansions, we scale up per phase.

What if my process is too complex?

We've built for aerospace companies, international schools, real estate firms, and retailers, all with exceptions no off-the-shelf package can handle.

What technology is it built with?

We use the same technology as large organisations: Next.js, Supabase, Vercel and Tailwind. Proven, open source and widely supported. We flexibly choose the framework that best fits your use case.