나갈시간

⏰ Gangnam Station by 9:00? Leave at 8:12.

This is the simplest reverse-calculation transportation app that automatically calculates your departure time just by entering your arrival time. Don't worry every morning, "Do I need to leave now to avoid being late?" By combining OpenAPI data released by ODsay LAB, Kakao Map, Seoul Open Data Plaza (data.seoul.go.kr), and the Public Data Portal (data.go.kr), we provide departure times that account for transfers, walking time, and even the first and last trains.

🕐 Reverse Calculation — Calculate Backwards

Just tell us your destination and arrival time, and we will calculate your departure time for you. Transfer times, walking time, real-time timetables, and last train information are all automatically reflected.

🚇 Accuracy — Integration of Public Data

It cites and combines route navigation from ODsay LAB, place search from Kakao Maps, real-time subway arrival information OpenAPI released by the Seoul Open Data Plaza (data.seoul.go.kr), and the Ministry of Land, Infrastructure and Transport's TAGO bus arrival information OpenAPI released by the Public Data Portal (data.go.kr). Transfer walking times are corrected using actual measurement data and provided within an average error margin of 1-2 minutes.

📲 Widget — Always Display on Home Screen

The next departure time is always displayed up to date on the home screen widget (Small / Medium / Large). In the Favorites widget, you can instantly search for your commute routine with a single tap. You don't need to open the app; looking at the home screen is sufficient.

⭐ Favorites — One-Tap Commute

If you save frequently used routes for commuting to work, home, or exercise, you don't need to enter them every day. A single tap on the Favorites chip displays search results instantly.

🗺️ Route Map — All Metropolitan Area Lines at a Glance

The route map image released by the Seoul Metropolitan Transit Corporation on the Public Data Portal (data.go.kr) is cited and displayed under the KOGL Type 3 license (free use with attribution). All lines in the metropolitan area are included: Lines 1–9, Shinbundang Line, Bundang Line, Gyeongui-Jungang Line, Gyeongchun Line, Gyeonggang Line, Ui-Sinseol Line, Gimpo Goldline, Incheon Lines 1 and 2, Uijeongbu Light Rail, Yongin Everline, Sillim Line, GTX-A, Seohae Line, and Suin-Bundang Line.

🔔 Notification — Departure Time Push

Push notifications are sent at your set departure time. You can receive them in advance using options for 5, 10, or 15 minutes prior, allowing you time to prepare.

⏱ Automatic Last / First Train Notification

If your arrival time falls within the end of operating hours (01:00 ~ 05:00), the system will automatically notify you of the first train (around 05:30) or later. Routes where there is a risk of missing the last train will be displayed as a separate warning.

🎯 Select On-Time / Leisure Mode

You can choose between "On-Time" or "5-Minute Leisure / 10-Minute Leisure / 15-Minute Leisure" modes, allowing you to customize the experience to your preference. ✨ Simple User Flow

1. Search for departure/arrival points

2. Select arrival time (or quick chip — 09:00 AM arrival / 12:00 PM lunch / 18:00 PM departure)

3. Check automatically calculated departure time + route + transfer information

🔒 Secure Data Processing

- No sign-ups or logins — No name, email, phone number, or payment information collected

- Favorites and recent routes are stored only within the device

- All external API communications are encrypted via HTTPS (TLS 1.2+)

- Privacy Policy: https://nagalsigan.kr/privacy

📋 Source Datasets (All verifiable public OpenAPI)

- Route Maps — 4 types of Seoul Metro metropolitan subway maps (KOGL Type 3):

https://www.data.go.kr/data/15120713/fileData.do

- Bus Arrivals — Ministry of Land, Infrastructure and Transport TAGO Bus Arrival Information:

https://www.data.go.kr/data/15098530/openapi.do

- Subway Real-time Arrivals — Seoul Metropolitan Subway Real-time Arrival Information:

https://data.seoul.go.kr/dataList/OA-12764/F/1/datasetView.do

- Subway Timetable — Seoul Metro Station Code Subway Train Timetable:

https://data.seoul.go.kr/dataList/OA-101/A/1/datasetView.do

- Applicable License — KOGL Type 3 (Free Use with Attribution):

https://www.kogl.or.kr/info/license.do

💸 Free + Ads

You can use this for free without signing up, and banner ads may be displayed on some screens.

📱 Recommended Environment

- Android 7.0 (Nougat) or higher

- Internet connection required (for real-time timetable viewing)

⚠️ Disclaimer — Relationship with Government Agencies

Nagalssigan is a private app operated by Gradibo. It has no partnership or delegated authority with the Government of the Republic of Korea, the Seoul Metropolitan Government, Seoul Metro, the Ministry of Land, Infrastructure and Transport, or any other public institution, and does not represent government services.

All public data displayed by this app (subway timetables, bus timetables, route map images, etc.) is cited in accordance with the OpenAPI and KOGL (Korea Open Global Network) license terms officially released by the Public Data Portal (data.go.kr) and the Seoul Open Data Plaza (data.seoul.go.kr). The ultimate responsibility for data accuracy lies with the original data providers, and this app provides information for reference only.