Technology & lasting value

Tech at heart.Private by nature.

Turn on your alertsRental alerts from OpenSein
Recht van spreken Ailurii Lab

We build what we wished already existed. OpenSein signals you the moment a rental home opens up. Recht van spreken helps residents make their voice count. Priority isn’t for sale, not even if you ask nicely.

Scroll to discover

01 /The house

Purpose before everything

What drives us

  1. Build technology that serves people.
  2. Connect knowledge with the people who need it.
  3. Give everyone a fair shot.

What we stand for powers what we build.

Ailurii is the house behind OpenSein, Recht van spreken, Ailurii Nest and Ailurii Ai. Different services, built on the same principles: honest information, equal access and technology that serves people.

The work carries its own name. Ailurii provides the direction, the care and the continuity behind it. Ailurii Nest is the nest of the house. Everything comes together there: market data, boards, tools, Investing and Services & Usage.

02 /Our work

Different branches. One conviction.

Choose a service or project:Ailurii Nest

The nest of the house · by invitation

Ailurii Nest

Everything comes together here: market data from OpenSein, your boards and the tools we are building. One steady place to keep coming back to.

In the nest

  • Kompas

    What renting costs per neighbourhood, how that changes and what is for rent. With data from OpenSein.

  • Your boards

    Choose your neighbourhoods or make your own board. So you never start from scratch.

  • Honest figures

    A figure only appears with five or more observations. Better empty than guessed.

  • Compare rent

    Put a home next to similar listings in your area. You see a guide price and where the rent falls.

  • Services & Usage

    How much the technology behind Ailurii uses and where the limit is. With a heads-up when something gets tight.

  • Nest Ai later

    Ask a question in plain language about what you see in Nest. You get an explanation with the source. You decide.

Come in

nest.ailurii.nl · sign in without a password, with a passkey, email code or Google

No invitation yet? Ask for one via Let's talk. Choose Ailurii there.

A navy Dutch house with a glowing open door and a young red panda peeking around it
Housing · Technology

OpenSein

Example signal Service preview
  • A home opensOne round. Everyone together.
  • Straight to your channelThe signal, without the refresh.

Available → notification round → your channel

02 / OPENSEIN

The right signal.
At the same moment.

OpenSein is Ailurii’s notification service for private-sector and mid-market rentals. When a home is genuinely available, the signal turns green. The same moment for everyone.

Paid options add channels, convenience, coverage and alertness. Every notification round starts together. A signal, never a promise of a home.

At a glance

Rental homes
Private sector & mid-market
A fair start
Every round starts together
Your channel
More ways to receive a signal
Turn on your alerts

Who it is for

For people looking for a private-sector or mid-market rental home.

From signal to action
  1. Available
  2. A signal
  3. Your next step

The signal helps you act. You decide whether a home is right for you and what to do next.

A pale-blue meeting table, a letter and a young red panda peeking around a blue chair
Representation · Rights

Recht van
spreken

Example letter Service preview
A shared voice.
  • What matters to us.
  • What we propose.
  • What happens next.

From a shared concern to a clear proposal

03 / RECHT VAN SPREKEN

Your voice.
Already in the law.

Through Recht van spreken, Ailurii helps residents set up and run their committees. From understanding the Dutch Overlegwet to model letters you can actually use.

The right to be heard is already there. This service helps residents put it into practice, with clear information and a considered approach.

At a glance

Understand
Make sense of the Overlegwet
Put it in writing
Model letters you can use
Organise
Set up and run a committee
Create committee documents

Who it is for

For residents who want to bring shared questions and wishes to the table.

From question to conversation
  1. Understand
  2. Put into words
  3. Discuss together

Bring individual concerns together in one clear story, with a concrete proposal to discuss.

Independent identities. The same principles underneath.Scroll to explore →

OPENSEIN / Property × technology

Property expertise. Technology that keeps looking.

Status & speed

A professional rental search platform, built on property and IT expertise. Designed to spot new listings quickly and give your search a head start.

Requests per 24 hours
≈2.98 millionOur platform keeps searching. User traffic not included.Indicative volume · September 2026
Nationwide coverage
Providers across the NetherlandsPrivate-sector and mid-market rentals.
Including your city
All major Dutch citiesOne search, across provider boundaries.

Fast, continuous data collection powers every alert. Our scrapers collect rental listings, search filters find relevant matches and notifications go out in simultaneous rounds. Property expertise guides where we look. Technology keeps things moving.

03 /Our principles

What we stand for.

Honesty

Clear sight. Even in the dark.

Truth over comfort.

Some things are uncomfortable to say. We choose our words carefully and speak up. We put the facts on the table, own our mistakes and say when we do not know.

Versatility

At home on many branches.

Connect what we know.

Our strength lies in combining knowledge, experience and practical skill. We move between perspectives, connect ideas and bring thinking and doing together. Each challenge deserves an approach shaped around what it needs.

Independence

Our own way. Through the treetops.

Think independently.

We question assumptions, look closely and form our own judgement. That takes curiosity and a willingness to change our minds. We examine our own convictions as closely as anyone else’s.

Care

Soft paws. Sure steps.

Build with care.

Technology affects people. We consider who benefits, who bears the consequences and what will still matter in the long run. We take responsibility for what we build.

04 /Behind the name

Rare by nature.
Nocturnal by instinct.

When the world falls quiet, something begins to stir.

Ailurii is named after the red panda, the fire fox. We call ours Ailurii fulgens. It is the little one: playful, full of energy and always sniffing out the next adventure. Small paws, big plans.

The red panda is our mark. A signature that connects the work, while leaving each service room to be itself.

Ailuriieye-LOE-ree
The Ailurii mark: a young resting red panda with rounded ears, full cheeks and a striped tail
The mark of the house

Ailurii fulgens

Parvus, sed audax.Small, yet bold.

Ailurii fulgens joins the Greek aílouros, “cat”, with the Latin fulgens, “shining”. Together: the shining cat. A bright name for a creature that prefers to go unnoticed.

In the wildMost active around dawn and dusk, usually on its own. Among the branches, a ringed tail keeps its balance; in the cold, it becomes a blanket. A life of careful footing and quiet adaptation.

House loreIn our telling, the fire fox keeps watch where light meets shadow. Curious enough to leave the familiar branch. Quiet enough to notice what others miss. Small in stature; never short of nerve.

05 /An open line

Thoughtful work starts with a conversation.

Bother us here:
post@ailurii.nl

A question about OpenSein?contact@opensein.nl

What can we help you with?

A short description is enough. Please leave out sensitive information.

Usual response timeAilurii
Fewer than 3 working daysFor a substantive reply to your message.
Weekends and public holidays do not count.

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