diff --git a/package.json b/package.json
index f08a5ec..2b6c11e 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "zeed",
   "type": "module",
-  "version": "0.24.15",
+  "version": "0.24.16",
   "description": "🌱 Simple foundation library",
   "author": {
     "name": "Dirk Holtwick",
diff --git a/src/node/files.spec.ts b/src/node/files.spec.ts
index 0aa86a3..cc8d6bf 100644
--- a/src/node/files.spec.ts
+++ b/src/node/files.spec.ts
@@ -32,6 +32,8 @@ describe('files.spec', () => {
         "log/log-node.ts",
         "log/log-util.spec.ts",
         "log/log-util.ts",
+        "open-browser.spec.ts",
+        "open-browser.ts",
       ]
     `)
   })
diff --git a/src/node/open-browser.spec.ts b/src/node/open-browser.spec.ts
new file mode 100644
index 0000000..da86143
--- /dev/null
+++ b/src/node/open-browser.spec.ts
@@ -0,0 +1,36 @@
+import { exec } from 'node:child_process'
+import { platform } from 'node:os'
+import { describe, expect, it, vi } from 'vitest'
+import { openBrowser } from './open-browser'
+
+vi.mock('node:child_process', () => ({
+  exec: vi.fn(),
+}))
+
+vi.mock('node:os', () => ({
+  platform: vi.fn(),
+}))
+
+describe('openBrowser', () => {
+  it('should open URL on macOS', () => {
+    vi.mocked(platform).mockReturnValue('darwin')
+    openBrowser('http://example.com')
+    expect(exec).toHaveBeenCalledWith('open http://example.com')
+  })
+
+  it('should open URL on Windows', () => {
+    vi.mocked(platform).mockReturnValue('win32')
+    openBrowser('http://example.com')
+    expect(exec).toHaveBeenCalledWith('start http://example.com')
+  })
+
+  it('should open URL on Linux', () => {
+    vi.mocked(platform).mockReturnValue('linux')
+    openBrowser('http://example.com')
+    expect(exec).toHaveBeenCalledWith('xdg-open http://example.com')
+  })
+
+  // it('should open URL on unknown platform for real', () => {
+  //   openBrowser('http://example.com')
+  // })
+})
diff --git a/src/node/open-browser.ts b/src/node/open-browser.ts
new file mode 100644
index 0000000..67fb7ef
--- /dev/null
+++ b/src/node/open-browser.ts
@@ -0,0 +1,16 @@
+// Open URL in default browser on macOS, Linux, and Windows
+import { exec } from 'node:child_process'
+import { platform } from 'node:os'
+
+export function openBrowser(url: string) {
+  switch (platform()) {
+    case 'darwin':
+      exec(`open ${url}`)
+      break
+    case 'win32':
+      exec(`start ${url}`)
+      break
+    default:
+      exec(`xdg-open ${url}`)
+  }
+}