The smart way to manage rentals
Classic packages store your files. Cynsio does the work: payments tied to the right lease, indexations calculated correctly under the law, reminders and formal notices sent.
Your rent income, live
Watch every euro arrive
Cynsio links your bank and matches each rent payment to the right lease automatically. No spreadsheets, no guesswork. Just a clear view of what comes in each month.
Collected this month
€ 8.250Rent collected per month · auto-matched
The work that comes back every month, automated
Cynsio brings indexation, bank reconciliation, follow-up and reporting together. Built for the Belgian rental market, from 1 to 10,000+ units.
Nieuwe huur
€ 1.024
No lease that misses its indexation
Region-aware calculation (Flanders, Brussels, Wallonia) on the health index. See who is eligible and apply the new rent in one click, with an audit trail.
- Region-aware
- On the health index
- One click + audit trail
Mededeling: +++090/9337/55493+++
Appartement 3B
Janssens · contract #1042
Even the payments that do not come in cleanly
Connect your bank (secure, read-only). Cynsio matches every payment to the right contract on amount, reference and IBAN.
- Secure bank link
- Automatic matching
- Partial payments too
38
4
2
Herinnering verstuurd
Automatisch · 2 dagen voor de vervaldag
Arrears that do not grow quietly
A live view of who paid, who is late and what is missing, with automatic, friendly reminders and escalation when needed.
- Paid · late · missing
- Automatic reminders
- Escalation to formal notice
Prognose 2026
€ 148.200
Knowing what comes in next month
Monthly overviews and a yearly forecast of your income, so you see the money coming.
- Monthly overview
- Yearly forecast
- Export for your accountant
Management, documents & compliance
One source of truth for properties, units, contracts and contacts. Generate letters from templates, with user roles, audit trail and EU hosting.
- Properties, units & contracts
- Letters & documents
- Roles, audit & EU hosting
Software that follows up your rent, not another dossier to maintain
Most rental software mainly digitizes your paperwork. Cynsio takes on the work that comes back every month: knowing whether the rent was paid, and following up when it wasn’t.
Doing it yourself
Excel and your banking app
Classic management suite
The digital dossier
Cynsio
Payments reconciled automatically
On your own account, nothing to tick off yourself
Handles messy payments too
Wrong or missing reference, a different account, two months at once
Your tenant changes nothing
No portal, no app, no new payment method
Indexation computed and prepared
Legally correct and ready on the right date
One transparent price per property
Everything included, no modules or forced extras
You already keep contracts and documents somewhere. What you’re missing is certainty that the rent came in. That is what Cynsio is built for.
Your AI rental admin
Cynsio is building an AI layer over your entire rental management: an assistant that knows your portfolio, communication that writes itself, and alerts before anything goes wrong.
Cynsio assistant
Which leases can I index in March?
3 leases are eligible in March, together +€74 per month.
Apartment Deurne · Studio Antwerp · House Borgerhout
Draft the lettersCommunication that writes itself
Reminders and formal notices, drafted automatically at the right tone and escalation level, in NL and FR.
Smart payment matching
Matches the messy payments too: no reference, from a different account, or a round amount.
Proactive alerts
Cynsio warns you before it goes wrong: looming arrears, a double payment or an unusual amount.
Plus: let AI read your lease and fill in the contract automatically.
How it works
From bank connection to full overview, set up in minutes.
- Step 1
Connect your bank
Secure bank connection, read-only. We see your incoming payments but can never move money.
± 2 minutes - Step 2
Set your expected rent
Enter how much rent you expect per property and when. Or let AI pull it from your lease, soon.
Per property - Step 3
Get clarity instantly
Your dashboard shows in real time who paid, who is late and where action is needed. No more spreadsheets.
Real-time
Free check
Calculate your indexed rent
Enter your lease details. We compute from the official Statbel health index and account for your region’s rules.
Estimate based on the official health index. Cynsio computes it precisely, accounting for region and EPC. Not legal advice.
Read the full indexation guideSimple, transparent pricing
Cynsio is in early access. We are setting the rates together with the first landlords using it.
Solo
For getting started
Up to 2 units
Start free- Manual payment tracking
- Rent indexation calculator
- Automated reminders
- 1 user · no bank connection
Landlord
Collect & index correctly
Private landlord
Start with Landlord- Automatic bank reconciliation (read-only, 1 account)
- Indexation letter + one-click + audit trail
- Automated reminders
- Accountant export
- 1 user
Manager
Full management & compliance
Active landlord
Start with Manager- Everything in Landlord
- EPC & compliance dossier
- Document management
- Dunning ladder & escalation
- Up to 5 users
Rentmeester
For agencies & portfolios
Agency / portfolio
Start with Rentmeester- Everything in Manager
- Owners & bulk communication
- Multiple bank connections
- Unlimited users
- Volume pricing on request from 50 units
- Priority support & onboarding
More than 100 units, or an agency?
Talk to usPricing is per rentable unit per month; the rate itself is not fixed yet · Solo stays free · indexation calculator free · cancel anytime.
Frequently asked questions
Yes, we use PSD2 security (European standard) and connect in read-only mode. We see your payments but cannot send or change anything. You retain full control.
Axenimo BV is the company behind Cynsio. We build financial tools for the Belgian real estate sector.
Cynsio automatically compares what comes in with what you expect. Late, partial, or missing payments appear immediately in your dashboard.
No. Cynsio is not accounting software. It's a tool to track rental payments clearly. You can easily export everything for your accountant.
Cynsio is rental management software for landlords and property managers who want a clear overview without manual tracking, from single properties to large portfolios.
Most packages mainly digitize your dossier: contracts, documents and separate modules. Following up payments stays manual work, or your tenant has to change how they pay. Cynsio starts from your bank account: payments are recognized and matched automatically, indexation is computed correctly by law, and reminders go out by themselves. Your tenant changes nothing, and you pay one transparent price per property.
Built in Belgium. Made for landlords.
Stop chasing rent. Start collecting clarity.
Connect your bank, set expected rent, and let Cynsio handle tracking, reminders and indexation, in minutes.
Request early access
We’re inviting an initial group of landlords and property managers to get early access and help shape Cynsio based on real-world workflows.