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COBOL · IBM iSeries (AS/400)

Ecofin AS400

COBOL business management on iSeries. The reliability that never fails.

Green screen, COBOL and a system that has been running mission-critical operations since the 1990s without a single scare. Ecofin AS400 doesn't change how it works because it works: it gains functionality year after year without forcing your team to relearn anything.

✓Stability proven over decades✓No forced migrations, no disruption✓Functionality that keeps growing✓Expert COBOL and iSeries support
Old school, zero surprisesIBM iSeries · AS/400 · COBOL

Ecofin AS400 is a management solution developed in COBOL on IBM iSeries (AS/400). It is old-school technology (green screen, no new interface or API) that keeps running with reliability proven over decades. It is built for companies that depend on their AS/400 and want to maintain it and evolve it without risk.

What it is

What is Ecofin AS400?

Definition

Ecofin AS400 is a business management solution developed in COBOL on IBM iSeries (AS/400). It runs on a green screen, prioritizes reliability and speed of use, and keeps gaining functionality without changing the way the team works.

The IBM iSeries (formerly known as AS/400) is one of the most reliable systems ever built for business management. Since the 1990s, thousands of companies have run their critical processes on it: invoicing, warehouse, accounting, production. Ecofin AS400 is the management solution that lives on that platform.

Let's be clear: it's a green screen, and on purpose. We won't sell you a new interface you don't need, or an API that would complicate something that is simple and robust today. For the people who use it, the keyboard flies; for the people who maintain it, there are no surprises. And if one day you want to surround it with modern layers, the rest of the group does that on the outside, without touching the core.

Why stay on AS/400

Boring is also a competitive advantage.

While other systems reinvent themselves every couple of years and drag their people through every change, the AS/400 does what it always does: work.

Reliability

Proven over decades

Decades of continuous operation back every line of COBOL. Where others promise stability, the iSeries proves it.

Continuity

No forced migrations

You don't have to throw away what works to keep moving forward. We evolve the system without stopping your business.

Functionality

Grows without changing the workflow

We add new capabilities while keeping intact the workflow your team already knows. More power, same routine.

Cost

Predictable and contained

No licence surprises and no multimillion-euro migration projects. Total cost of ownership works in your favour.

Expertise

Skills that are scarce

COBOL and iSeries talent is increasingly rare. We have it, and we put it to work looking after your system.

Coexistence

Alongside the rest of the group

Need modern web or data around it? The Ecofin ecosystem attaches on the outside without touching the reliable core.

Straight talk

Yes, it's a green screen. And proudly so.

A well-known 5250 terminal is faster to operate than many modern interfaces: no mouse, no waiting. That's the reality we offer, with no dressing it up.

And when you want to modernize the experience around it, we do that on the outside with the rest of the group, without putting the core at risk. Take a look at Ecofin ERP too if you're after a modular web interface.

How it works

How we maintain and grow your AS/400.

We work on your production system and evolve it without putting the core at risk.

01

System assessment

We review your COBOL installation on iSeries: programs, dependencies and critical points.

02

Maintenance and fixes

We resolve issues and ensure day-to-day continuity, with no surprises.

03

Functional evolution

We add or adjust functionality in COBOL while respecting the foundation already in service.

04

Optional opening up

If you need it, we surround the core with modern layers (web, data, integration) on the outside, without touching it.

Glossary

Key terms in the iSeries world

AS/400
An IBM system launched in 1988, a highly reliable foundation for business management; now evolved as iSeries / IBM i.
IBM iSeries
The modern name for the AS/400 platform; it keeps its robustness and compatibility with COBOL applications.
COBOL
A business-oriented programming language, reliable and still very much present in critical systems.
Green screen (5250)
The text interface of iSeries terminals; fast to operate for expert users.
Key points to decide

What you should know before you start

Is it worth staying on the AS/400 in 2026?
If your operation runs on iSeries, yes: it is an extremely reliable platform. The sensible move is to maintain and evolve it, not rewrite it for the sake of fashion.
Can you maintain and extend an old COBOL system?
Yes. We work with COBOL on iSeries: we fix, improve and add functionality while respecting the foundation already in service.
Does it have a web interface or API?
It is classic green-screen management. If in the future you need to open the data to the outside, we scope that as a separate project.
Frequently asked questions

Everything people usually ask about Ecofin AS400

What is Ecofin AS400?
A business management solution in COBOL on IBM iSeries (AS/400). It runs on a green screen, prioritizes reliability and speed of use, and keeps gaining functionality without changing the way you work.
A green screen in 2026? Isn't that obsolete?
Obsolete would mean it stopped working, and it does exactly the opposite. Thousands of mission-critical companies stay on iSeries because its reliability and speed of use outperform many modern interfaces. It is a choice, not a leftover.
Why not migrate to something new?
If your operation works, migrating is risk and cost with no clear return. We prefer to grow the system with functionality and, if needed, surround it with modern layers on the outside without touching the core.
Do you keep adding functionality?
Yes. We extend capabilities while keeping the way of working intact. Users gain options without having to relearn their day-to-day routine.
Will I still find support in a few years?
With us, yes. COBOL and iSeries expertise is scarce in the market, and it is precisely one of our specialties within the group.
What if I want a more modern interface?
We can surround the AS/400 with web or data layers on the outside, without touching the core. And if you're looking for a solution with a modular web interface, there's Ecofin ERP.

Your iSeries is fine. Let's keep it that way.

We review your installation, tell you what to evolve and what to leave alone, and offer expert long-term support.

Your iSeries is fine. Let's keep it that way.

We review your installation, tell you what to evolve and what to leave alone, and offer expert long-term support.