diff --git a/app/internal/window/os_js.go b/app/internal/window/os_js.go
index e537eb96..5aef3350 100644
--- a/app/internal/window/os_js.go
+++ b/app/internal/window/os_js.go
@@ -210,8 +210,11 @@ func (w *window) keyEvent(e js.Value) {
 	k := e.Get("key").String()
 	if n, ok := translateKey(k); ok {
 		cmd := key.Event{Name: n}
+		if e.Call("getModifierState", "Alt").Bool() {
+			cmd.Modifiers |= key.ModAlt
+		}
 		if e.Call("getModifierState", "Control").Bool() {
-			cmd.Modifiers |= key.ModCommand
+			cmd.Modifiers |= key.ModCtrl
 		}
 		if e.Call("getModifierState", "Shift").Bool() {
 			cmd.Modifiers |= key.ModShift
diff --git a/app/internal/window/os_macos.go b/app/internal/window/os_macos.go
index ed4edb2c..152d8e8c 100644
--- a/app/internal/window/os_macos.go
+++ b/app/internal/window/os_macos.go
@@ -119,6 +119,12 @@ func gio_onFrameCallback(view C.CFTypeRef) {
 func gio_onKeys(view C.CFTypeRef, cstr *C.char, ti C.double, mods C.NSUInteger) {
 	str := C.GoString(cstr)
 	var kmods key.Modifiers
+	if mods&C.NSAlternateKeyMask != 0 {
+		kmods |= key.ModAlt
+	}
+	if mods&C.NSControlKeyMask != 0 {
+		kmods |= key.ModCtrl
+	}
 	if mods&C.NSCommandKeyMask != 0 {
 		kmods |= key.ModCommand
 	}
diff --git a/app/internal/window/os_windows.go b/app/internal/window/os_windows.go
index 58d53c76..41fc92f4 100644
--- a/app/internal/window/os_windows.go
+++ b/app/internal/window/os_windows.go
@@ -94,6 +94,9 @@ const (
 	_USER_TIMER_MINIMUM = 0x0000000A
 
 	_VK_CONTROL = 0x11
+	_VK_LWIN    = 0x5B
+	_VK_MENU    = 0x12
+	_VK_RWIN    = 0x5C
 	_VK_SHIFT   = 0x10
 
 	_VK_BACK   = 0x08
@@ -280,6 +283,12 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
 	case _WM_KEYDOWN, _WM_SYSKEYDOWN:
 		if n, ok := convertKeyCode(wParam); ok {
 			cmd := key.Event{Name: n}
+			if getKeyState(_VK_LWIN)&0x1000 != 0 || getKeyState(_VK_RWIN)&0x1000 != 0 {
+				cmd.Modifiers |= key.ModSuper
+			}
+			if getKeyState(_VK_MENU)&0x1000 != 0 {
+				cmd.Modifiers |= key.ModAlt
+			}
 			if getKeyState(_VK_CONTROL)&0x1000 != 0 {
 				cmd.Modifiers |= key.ModCtrl
 			}
diff --git a/app/internal/window/os_x11.go b/app/internal/window/os_x11.go
index 00458ca9..81edf1c9 100644
--- a/app/internal/window/os_x11.go
+++ b/app/internal/window/os_x11.go
@@ -334,6 +334,12 @@ func (h *x11EventHandler) handleEvents() bool {
 
 func x11KeyStateToModifiers(s C.uint) key.Modifiers {
 	var m key.Modifiers
+	if s&C.Mod1Mask != 0 {
+		m |= key.ModAlt
+	}
+	if s&C.Mod4Mask != 0 {
+		m |= key.ModSuper
+	}
 	if s&C.ControlMask != 0 {
 		m |= key.ModCtrl
 	}
diff --git a/app/internal/xkb/xkb_unix.go b/app/internal/xkb/xkb_unix.go
index 398348ed..1d024e7f 100644
--- a/app/internal/xkb/xkb_unix.go
+++ b/app/internal/xkb/xkb_unix.go
@@ -42,6 +42,8 @@ type Context struct {
 var (
 	_XKB_MOD_NAME_CTRL  = []byte("Control\x00")
 	_XKB_MOD_NAME_SHIFT = []byte("Shift\x00")
+	_XKB_MOD_NAME_ALT   = []byte("Mod1\x00")
+	_XKB_MOD_NAME_LOGO  = []byte("Mod4\x00")
 )
 
 func (x *Context) Destroy() {
@@ -129,6 +131,12 @@ func (x *Context) DispatchKey(keyCode uint32) (events []event.Event) {
 		if C.xkb_state_mod_name_is_active(x.state, (*C.char)(unsafe.Pointer(&_XKB_MOD_NAME_SHIFT[0])), C.XKB_STATE_MODS_EFFECTIVE) == 1 {
 			cmd.Modifiers |= key.ModShift
 		}
+		if C.xkb_state_mod_name_is_active(x.state, (*C.char)(unsafe.Pointer(&_XKB_MOD_NAME_ALT[0])), C.XKB_STATE_MODS_EFFECTIVE) == 1 {
+			cmd.Modifiers |= key.ModAlt
+		}
+		if C.xkb_state_mod_name_is_active(x.state, (*C.char)(unsafe.Pointer(&_XKB_MOD_NAME_LOGO[0])), C.XKB_STATE_MODS_EFFECTIVE) == 1 {
+			cmd.Modifiers |= key.ModSuper
+		}
 		events = append(events, cmd)
 	}
 	C.xkb_compose_state_feed(x.compState, sym)
diff --git a/io/key/key.go b/io/key/key.go
index bca97812..f33bfde5 100644
--- a/io/key/key.go
+++ b/io/key/key.go
@@ -64,6 +64,12 @@ const (
 	ModCommand
 	// ModShift is the shift modifier key.
 	ModShift
+	// ModAlt is the alt modifier key, or the option
+	// key on Apple keyboards.
+	ModAlt
+	// ModSuper is the "logo" modifier key, often
+	// represented by a Windows logo.
+	ModSuper
 )
 
 const (
@@ -121,5 +127,11 @@ func (m Modifiers) String() string {
 	if m.Contain(ModShift) {
 		strs = append(strs, "ModShift")
 	}
+	if m.Contain(ModAlt) {
+		strs = append(strs, "ModAlt")
+	}
+	if m.Contain(ModSuper) {
+		strs = append(strs, "ModSuper")
+	}
 	return strings.Join(strs, "|")
 }