Popular Custom URL Schemes

Here are 21 popular custom URL schemes used by various apps across platforms:

WhatsApp (whatsapp://)

Usage: Opens a WhatsApp chat or sends a pre-filled message.
Example:
```
whatsapp://send?text=Hello
```

Facebook Messenger (fb-messenger://)

Usage: Opens a Facebook Messenger conversation.
Example:
```
fb-messenger://user/USER_ID
```

Steam (steam://)

Usage: Opens Steam client to access games, servers, a store page, or friends.
Example (Connect to a Server):
```
steam://connect/IP_ADDRESS:PORT
```
Example:
```
steam://rungameid/0
```

Twitter (twitter://)

Usage: Opens Twitter profiles, tweets, or compose windows.
Example:
```
twitter://user?screen_name=example
```

Instagram (instagram://)

Usage: Opens specific profiles, posts, or the camera.
Example:
```
instagram://user?username=example
```

Google Maps (comgooglemaps:// or maps:// on iOS)

Usage: Opens Google Maps to show locations, directions, or search queries.
Example:
```
comgooglemaps://?q=QUERYHERE
```

YouTube (youtube://)

Usage: Opens a YouTube video, channel, or search result.

Example:

youtube://www.youtube.com/watch?v=VALUE

Zoom (zoomus://)

Usage: Opens Zoom to join or start a meeting.
Example:
```
zoomus://zoom.us/join?confno=123456789
```

Spotify (spotify://)

Usage: Launches Spotify to play a song, album, or playlist.
Example:
```
spotify://track/TRACKID
```

Mail (mailto://)

Usage: Opens the default email client with pre-filled email information.

Example:

mailto:[email protected]?subject=Hello

Phone (tel://)

Usage: Initiates a phone call from a smartphone.
Example:
```
tel:+1234567890
```

Viber (viber://)

Usage: Opens a chat or call in Viber.
Example:
```
viber://contact?number=1234567890
```

Telegram (tg://)

Usage: Opens a specific Telegram chat or bot.
Example:
```
tg://resolve?domain=example
```

Pinterest (pinterestsdk://)

Usage: Opens Pinterest to a specific pin or board.
Example:
```
pinterestsdk://pin/12345
```

LinkedIn (linkedin://)

Usage: Opens a LinkedIn profile or post.
Example:
```
linkedin://profile/12345
```

Snapchat (snapchat://)

Usage: Opens Snapchat, either to the camera or a specific user.
Example:
```
snapchat://add/user_name
```

TikTok (snssdk1128://)

Usage: Opens TikTok to a specific video or profile.
Example:
```
snssdk1128://user/12345
```

WeChat (weixin://)

Usage: Opens WeChat to start a chat or view a profile.
Example:
```
weixin://dl/chat
```

Slack (slack://)

Usage: Opens a specific Slack workspace or channel.
Example:
```
slack://channel?id=CHANNEL_ID
```

Dropbox (dbapi-8-emm://)

Usage: Opens Dropbox to view or share a file.
Example:
```
dbapi-8-emm://1/view/some-file
```

Skype (skype://)

Usage: Launches Skype for calls, messages, or specific contacts.
Example:
```
skype://username?call
```