Cenacheck — Polish Proper

Wondering whether the asking price — or the monthly rent — on Otodom, OLX or Morizon is fair? CenaCheck instantly shows you the real transaction prices from Poland's official Rejestr Cen Nieruchomości (RCN) plus a rental yield analysis — without leaving the listing page, without searching, without clicking through PDFs.

🏠 WHAT CENACHECK DOES

Open any property listing in Poland — for sale OR for rent — and CenaCheck automatically displays an overlay panel with:

→ Median price per square meter in the neighborhood (based on real notarial deeds)
→ Asking price compared against actual transaction prices
→ Quarterly price trend for the district / city
→ Number of transactions within a 1 km radius
→ AI analysis: is this a good price? What should you check?
→ Estimated rental yield for investors looking at sale listings
→ Reverse yield for tenants: is the monthly rent fair vs. local sale prices?

📊 DATA SOURCE: REJESTR CEN NIERUCHOMOŚCI (RCN)

We use Poland's official, government-maintained Real Property Price Registry (RCN) — a database of 3.85 million real transactions from notarial deeds across the country. These are NOT asking prices (which are often inflated). These are the REAL amounts people actually paid for their apartments.

🏘️ FOR TENANTS

CenaCheck also works on rental listings. Open any apartment for rent on Otodom, OLX or Morizon and we show:

→ Whether the monthly rent is fair compared to local sale prices
→ Reverse yield: what annual return the landlord is making at this rent
→ A high yield (>7%) means you're overpaying; a low yield (<4%) is a tenant-friendly deal
→ RCN median price per m² in the area — solid leverage for negotiation
→ Neighborhood infrastructure, transit, air quality

Know how much rent you should be paying before you sign the lease.

💼 FOR BUY-TO-LET INVESTORS

Looking at an apartment as an investment? CenaCheck shows in 30 seconds:

→ Rental yield calculated against the sale-side asking price
→ Sale price compared with the RCN median for the area
→ Average local rents as a yield benchmark
→ Quarterly price trend — is the area appreciating?
→ One-click rental return calculator

The perfect due-diligence tool before committing to a buy-to-let.

🌍 NEIGHBORHOOD — INFRASTRUCTURE & QUALITY OF LIFE

CenaCheck shows you what surrounds the apartment:
→ Schools, kindergartens, universities (OpenStreetMap data)
→ Grocery stores, supermarkets, pharmacies
→ Parks, playgrounds, green areas
→ Public transit — buses, trams, metro
→ Air quality — PM2.5 and PM10 from the nearest GIOŚ station

🔧 WHERE IT WORKS

CenaCheck works on the three largest property portals in Poland — both the sale and the rental sections:
✓ Otodom.pl (sale + rent)
✓ OLX.pl real estate (sale + rent)
✓ Morizon.pl (sale + rent)

Just install the extension and visit any listing — the CenaCheck panel appears automatically and detects whether you're looking at a sale or a rental.

👥 WHO IT'S FOR

→ First-time home buyers — find out whether you're overpaying
→ Tenants — check whether the rent is fair before signing the lease
→ Real estate investors — yield, median and price trend in 30 seconds
→ Buy-to-let investors — rental yield right on the sale listing
→ Expats in Poland — interface available in English and Russian
→ Real estate agents — quick valuation cross-check for both sale and rent
→ Market analysts — a real-time map of sale prices and rents

🌐 LANGUAGES

CenaCheck is available in three languages:
→ Polski
→ English
→ Русский

🔒 PRIVACY

We don't track you. We don't sell data. No registration, no login. Local cache in your browser (24 hours) — fast and private.

⚡ WHY CENACHECK

CenaCheck is the only Chrome extension for the Polish real estate market that:
✓ Uses official Rejestr Cen Nieruchomości data (notarial deeds)
✓ Works on both sale AND rental listings — automatically
✓ Shows reverse yield for tenants — a unique feature
✓ Works on Otodom, OLX and Morizon simultaneously
✓ Shows price per m², median, trend, rental yield and AI analysis in one panel
✓ Is available in three languages (PL/EN/RU)
✓ Requires no account — instant use

🚀 HOW TO USE

1. Install CenaCheck
2. Open any sale or rental listing on Otodom, OLX or Morizon
3. The CenaCheck panel automatically appears with real transaction prices from the area
4. For sale: compare the asking price with the RCN median; for rent: check whether the monthly rate is fair
5. Make an informed decision

📈 KEY FEATURES

• Transaction prices from RCN (3.85M records)
• Median price per square meter
• Quarterly price trend chart
• Number of recent transactions in the area
• Rental yield calculator — sale-side
• Reverse yield for tenants — fair-rent check
• AI analysis (Claude) — context and recommendations
• Schools, shops, parks, transit (OpenStreetMap)
• Air quality PM2.5 / PM10 (GIOŚ)
• Three languages: PL / EN / RU
• 24h local cache — fast and offline-friendly

Buy your apartment with eyes open. Rent with eyes open. Check the real price with CenaCheck.