diff --git a/ui/src/ui/UIString.scala b/ui/src/ui/UIString.scala
new file mode 100644
index 0000000..cda544d
--- /dev/null
+++ b/ui/src/ui/UIString.scala
@@ -0,0 +1,19 @@
+package works.iterative.ui
+
+import com.raquo.laminar.nodes.TextNode
+
+/** UIString is meant to mark the strings that are part of the UI and subject to
+  * localization Another mechanism can later be used to find all these strings
+  * and customize.
+  */
+opaque type UIString = String
+
+object UIString:
+  def apply(s: String): UIString = s
+
+extension (ui: UIString) inline def toNode: TextNode = TextNode(ui)
+
+extension (s: String) inline def ui: UIString = UIString(s)
+
+given Conversion[UIString, TextNode] with
+  def apply(ui: UIString): TextNode = ui.toNode