Laca is a map for inviting friends to go out. Each "match" is an event where someone is inviting and appears as a pin on the map around you.

Examples of matches you might encounter:

• Badminton on Saturday night in Hoàn Kiếm, 19:00–21:30, 2 spots left, 50–80K/person
• Chill coffee evening on Tràng Tiền street, 19:30, already 3/6 people
• Strolling around Hoàn Kiếm Lake on Sunday afternoon, free
• Bun Cha for lunch tomorrow near work, 3 servings left

Problem: you’re free tonight and want to go somewhere, but when you ask your friends, everyone is busy or says "let's see." Meanwhile, there might be someone nearby who is looking for exactly one person to join, but they just can’t see each other.

Main features:

• View matches on the map or in a list format, filter by match type, number of people, price, and area
• Click "Request to join," the host approves and you enter the private chat group of the match
• When it’s time for the meeting, anyone who wants to can share their location so the whole group can see where everyone is headed
• Sending the match link in chat will show the information card, or you can upload an invitation image with a QR code to post in a story
• Matches can be public, friends-only, or private

Safety when going out with new people:

• No one can join a match without approval: the host reviews requests and can remove members at any time
• After playing, everyone rates each other from 1 to 5 stars; this rating appears on profiles, so next time you can see who is punctual and trustworthy
• Report a person or a match directly within the app; administrators review and may suspend violating accounts
• Block people you don’t want to meet again
• Location sharing is always controlled by you; turn it on or off, and it stops automatically when the match ends
• The "Safety" page on laca.strongdz.id.vn has tips before and during the meeting, reporting procedures, and emergency numbers in Vietnam

Laca has not yet verified identification documents. Accounts logged in with Google use an email verified by Google.

Who should use it: students and workers who want to find people to go for coffee, dining, or sports after classes or work; those who often organize badminton or football matches and need to find more participants.

How to get started: Laca is a web app, open laca.strongdz.id.vn on your computer or phone, and view the map without logging in. On your phone, you can add it to your home screen to use like an app and receive notifications, including on iPhone. Log in using email, phone number, or Google.

What distinguishes it: instead of posting to recruit people in a Facebook group which can get lost, each match is pinned exactly on the map, showing the scheduled time, costs, remaining spots, and has a dedicated chat group for those who have been approved.