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Geukmae Catch is an app that displays the asking prices of currently listed apartments numerically, comparing them to actual transaction prices for properties within the same complex and with the same floor plan.

Even for the same 84-square-meter unit, prices vary depending on the building, floor, and unit type. Geukmae Catch uses actual transaction-based indicators that reflect these differences to show you where each listing fits within the overall market trend.

■ Position of Each Listing Compared to Actual Transactions

· Calculations are based on 3.98 million actual apartment sales transactions (since 2006) from the Ministry of Land, Infrastructure and Transport.

· Displays the percentage above or below the current asking price compared to actual transactions within the same complex and floor plan, using grades from SS to D.

· Listings of the same floor plan within each complex are sorted by grade, allowing you to view them starting from the top-ranked listings.

· Covers 5,922 complexes in the Seoul Metropolitan Area and Daejeon.

■ Catch Hidden Floors

· For listings marked solely as ‘low floor,’ the system matches them with the official assessed price per unit to narrow down the actual floor options, displaying them as ‘Low (2nd, 3rd floors)/19’ or ‘Low (5th–8th floors)/25.’

· The rating is assigned based on the lowest floor among the candidates.

■ Filter by Your Criteria

· You can view only listings with tenants (rented properties) or exclude them.

· You can filter by the KB market price ceiling, excluding 1st and 2nd floors, number of rooms, and walking time to the station.

■ Complex Details

· Trends in actual transaction prices by unit size and currently available listings.

· Royal Buildings: Displays price differences by building and unit type within the same complex based on actual transactions across approximately 2,000 complexes.

· Complex indicators such as turnover rate and levels relative to previous peaks.

■ Fastest Actual Transaction Beta

· Collects transaction estimates for cases where a unit's listing has disappeared from multiple real estate agencies simultaneously, displaying this data before it is publicly released by the Ministry of Land, Infrastructure and Transport. · In observations from August to November 2026, land transaction permit zones were designated on average about 35 days earlier than the Ministry of Land, Infrastructure and Transport's public announcement, while other areas were designated on average about 10 days earlier.

· The displayed price is the asking price before the listing disappears, not the contract price.

■ Trends

· Seoul Metropolitan Area TOP 300: Complexes ranked by long-term growth rates and liquidity (400+ households · within 800m of a station · within a 10-minute walk of an assigned elementary school)

· Our neighborhood's property classification and changes in classification since 2006

· Breaking through previous peaks, turnover rate, and price cycle map

■ Quick Sale Bot

· View questions exchanged in the KakaoTalk Quick Sale Catch discussion room and the Quick Sale Bot's answers within the app.

· The Quick Sale Bot answers questions such as complex comparisons and liquidity during downturns using actual transaction and listing data, and generates comparison charts.

· Questions are accepted in the KakaoTalk discussion room.

· You can report or hide offensive posts, and block the author.

■ Notifications

· Registering a complex of interest collects new listings, reported transactions, and the fastest real transaction news in the Notifications tab.

· You can view the lowest asking prices, recent transactions, and today's news for the complexes you receive notifications for via a home screen widget without opening the app.

· Long-pressing the app icon allows you to go directly to Notifications, Fastest Real Transactions, Quick Sale Bot, and Comparison Box.

■ Comparison Box

· Gather complexes of interest in the Comparison Box to view liquidity, growth rate, and comparison against previous peaks side by side.

You can browse without logging in. Complexes of Interest, Notifications, Comparison Box, and Quick Sale Bot can be used after logging in with a Kakao account.

Real transaction information is based on publicly available real transaction price data from the Ministry of Land, Infrastructure and Transport. The indicators on the screen are for reference only and do not replace transaction decisions.