Cynsio

One platform for your portfolio

Your rental management.Made simple.

From properties and leases to payments, indexation and reporting. Cynsio brings your portfolio together and automates recurring tasks.

Try it free for 30 daysSee how it works

30 days free, no card. Then € 7 per rentable unit per month, excl. VAT.

Hosted in the EU, GDPR-compliantBuilt for Belgian landlords and property managers.
Read-only: Cynsio never moves moneyGDPR & EU data hostingBuilt in BelgiumAudit trail of changes

From your first property to month-end

Your portfolio and its administration, together.

Your portfolio

Properties, units, tenants, owners and leases together. Documents kept with the right record.

Your rental administration

Match payments, prepare indexations and draft reminders. You review and decide.

Your reporting

A monthly overview, a statement per owner and an export for your accountant.

Explore all features

Follow one month through Cynsio

Open the four steps. Process an example payment, apply an example indexation and review the statement.

Cynsio October 2026Fictitious data

Your records together

View the properties, units and leases in your portfolio.

Properties
3
Units
3
Leases
3
Monthly rent
€2,925
  • Kunstlaan 12Owner A · €975
  • Parkstraat 8Owner A · €850
  • Korenmarkt 4Owner B · €1,100

Simplified example with fictitious data. No payments are processed and no messages are sent.

Getting started with Cynsio

Bring your portfolio together, process payments and keep your records up to date.

  1. Step 1

    Bring your portfolio together

    Add properties, units, leases, tenants and owners or import your existing data. Review the data before using it.

  2. Step 2

    Bring in your payments

    With a file from your bank, such as CODA or CSV. Cynsio has no access to your account and can never move money.

  3. Step 3

    Review and complete

    Review payment statuses, exceptions and indexations. You apply changes and send letters. Use the figures for your owner statements.

One clear rate for your rental management

€ 7 per rentable unit per month, excl. VAT. Work out what your portfolio costs.

One rate per unit

One building with six apartments counts as six units. Units without an active lease count too.

€7/month, excl. VAT

€ 7 per unit. On a rent of € 800, that is less than 1%.

Try 30 days free

No card needed. Cancel anytime.

Everything included

  • Know every month who has paid. And who hasn’t.

    Payments matched to the right rent, with reminders and formal notices from templates.

  • Indexation without the arithmetic

    On the Belgian health index, with the indexation letter.

  • Ready for owners and your accountant

    Owner statements, exports, EPC and document dossier, user roles and audit trail.

Bank connection included: 1 account, 2 from 5 units, 3 from 10 units. More on request.

Only letters by post are charged per letter, when you send them: € 2 regular, € 14.50 registered, excl. VAT.

Want to discuss your portfolio first? Plan a call.

Help with rental administration

Managing for several owners?

Explore owner statements, user roles and help importing your portfolio.

For property managers

Frequently asked questions

Cynsio can never move money. Your data is hosted in the EU. User roles control what people can do, and an audit trail records changes.

Get started today

Less admin. More control over your portfolio.

Bring your properties, leases, payments and reporting together. Cynsio automates recurring tasks so you keep the overview.

Start free trial

30 days free, no card. Then € 7 per rentable unit per month, excl. VAT.