What is 0io.io?

0io.io is a universal URI scheme gateway. It turns any URI scheme — mailto:, tel:, vscode:, slack:, spotify:, and dozens more — into a clickable HTTP link that works everywhere.

The Problem

Most platforms (Slack, Twitter, Discord, email clients) only allow http:// and https:// links. If you want to share a phone number, an email address, a VS Code workspace, or a Zoom meeting link using their native URI scheme, you're stuck — the link won't be clickable.

For example:

• vscode://file/path/to/project — won't render as a link on most platforms
• tel:+1234567890 — not clickable in most chat apps
• slack://channel?team=T123&id=C456 — broken outside of Slack

The Solution

Prefix any URI with https://0io.io/ and it becomes a standard HTTP link:

https://0io.io/mailto:hello@example.com
https://0io.io/tel:+1234567890
https://0io.io/vscode://file/path/to/project
https://0io.io/slack://channel?team=T123&id=C456

When someone clicks the link:

1. They land on a clean redirect page hosted on Cloudflare's edge
2. They see what scheme and target they're about to open
3. The browser automatically redirects to the native URI handler
4. If the redirect doesn't trigger, a manual button is provided

Use Cases

Scenario	URI	0io.io Link
Share an email address	mailto:hi@example.com	https://0io.io/mailto:hi@example.com
Share a phone number	tel:+1234567890	https://0io.io/tel:+1234567890
Open a VS Code project	vscode://file/path	https://0io.io/vscode://file/path
Join a Zoom meeting	zoommtg://zoom.us/join?confno=123	https://0io.io/zoommtg://zoom.us/join?confno=123
Open a Spotify track	spotify:track:4uLU6hMCjMI75M1A2tKUQC	https://0io.io/spotify:track:4uLU6hMCjMI75M1A2tKUQC
Send an SMS	sms:+1234567890	https://0io.io/sms:+1234567890

Why "0io"?

Short, memorable, and fast to type. The 0 (zero) represents the zero friction between any URI scheme and the web.