diff --git a/.phase11-state.json b/.phase11-state.json
index e94acf0..3a1dba3 100644
--- a/.phase11-state.json
+++ b/.phase11-state.json
@@ -1,9 +1,10 @@
 {
   "completed_features": [],
-  "current_feature": "customer-archive",
+  "current_feature": "project-cloning",
   "started_at": "2026-05-23T06:21:46.924268",
   "attempted_features": [
     "onboarding-tour",
-    "time-entry-csv-import"
+    "time-entry-csv-import",
+    "customer-archive"
   ]
 }
\ No newline at end of file
diff --git a/GENERATION_LOG.md b/GENERATION_LOG.md
index 21aeb18..61d4fa1 100644
--- a/GENERATION_LOG.md
+++ b/GENERATION_LOG.md
@@ -1361,3 +1361,22 @@ src/index.ts(27,25): error TS2769: No overload matches this call.
   Overload 2 of 3, '(plugin: FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
     Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
       Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, FastifyBaseLogger, FastifyTy
+- `06:27:29` **INFO**   Committed feature customer-archive
+- `06:27:29` **INFO**   Pushed: rc=0
+
+## Phase-3 Feature: project-cloning (2026-05-23 06:27:29)
+
+- `06:27:29` **INFO** Description: Project-Clone Endpoint + UI-Button
+- `06:27:29` **INFO**   Generating apps/api/src/routes/projects.ts (ERWEITERT — behalte alles. Füge POST /:id/clone (body optional: {name}…)
+- `06:28:12` **INFO**     wrote 4670 chars in 43.1s (attempt 1)
+- `06:28:12` **INFO**   Generating apps/web/src/pages/Projects.tsx (ERWEITERT — füge Clone-Button (Copy-Icon lucide-react) pro Row. Mutati…)
+- `06:29:02` **INFO**     wrote 6180 chars in 50.1s (attempt 1)
+- `06:29:02` **INFO** Running tsc --noEmit on api…
+- `06:29:04` **WARN**   tsc errors:
+src/index.ts(27,25): error TS2769: No overload matches this call.
+  Overload 1 of 3, '(plugin: FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
+    Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginCallback<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
+      Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, FastifyBaseLogger, FastifyTypeProvider>, opts: { ...; }, done: (err?: Error | undefined) => void): void'.
+  Overload 2 of 3, '(plugin: FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>, opts?: FastifyRegisterOptions<...> | undefined): FastifyInstance<...> & PromiseLike<...>', gave the following error.
+    Argument of type 'Promise<FastifyMultipartPlugin>' is not assignable to parameter of type 'FastifyPluginAsync<{ limits: { fileSize: number; }; }, RawServerDefault, FastifyTypeProvider, FastifyBaseLogger>'.
+      Type 'Promise<FastifyMultipartPlugin>' provides no match for the signature '(instance: FastifyInstance<RawServerDefault, IncomingMessage, ServerResponse<IncomingMessage>, FastifyBaseLogger, FastifyTy
diff --git a/apps/api/src/routes/projects.ts b/apps/api/src/routes/projects.ts
index f7535ea..0287fd0 100644
--- a/apps/api/src/routes/projects.ts
+++ b/apps/api/src/routes/projects.ts
@@ -11,6 +11,10 @@ const ProjectSchema = z.object({
 
 const ProjectUpdateSchema = ProjectSchema.partial()
 
+const ProjectCloneSchema = z.object({
+  name: z.string().optional()
+})
+
 export default async function projectRoutes(fastify: FastifyInstance) {
   fastify.addHook("preHandler", async (request, reply) => {
     try {
@@ -117,6 +121,32 @@ export default async function projectRoutes(fastify: FastifyInstance) {
     return reply.code(201).send(project)
   })
 
+  fastify.post("/:id/clone", async (request, reply) => {
+    const { id } = request.params as { id: string }
+    const body = ProjectCloneSchema.parse(request.body || {})
+
+    const [original] = await db
+      .select()
+      .from(projects)
+      .where(eq(projects.id, id))
+      .limit(1)
+
+    if (!original) {
+      return reply.code(404).send({ message: "Project not found" })
+    }
+
+    const [cloned] = await db
+      .insert(projects)
+      .values({
+        name: body.name || `${original.name} (Kopie)`,
+        customerId: original.customerId,
+        active: original.active
+      })
+      .returning()
+
+    return reply.code(201).send(cloned)
+  })
+
   fastify.patch("/:id", async (request, reply) => {
     const { id } = request.params as { id: string }
     const body = ProjectUpdateSchema.parse(request.body)
diff --git a/apps/web/src/pages/Projects.tsx b/apps/web/src/pages/Projects.tsx
index ebbf223..959727b 100644
--- a/apps/web/src/pages/Projects.tsx
+++ b/apps/web/src/pages/Projects.tsx
@@ -1,5 +1,6 @@
 import { useState } from "react"
 import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query"
+import { Copy, Trash2 } from "lucide-react"
 import { api } from "../lib/api"
 
 export default function Projects() {
@@ -27,6 +28,13 @@ export default function Projects() {
     }
   })
 
+  const cloneMutation = useMutation({
+    mutationFn: (id: string) => api.cloneProject(id),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ["projects"] })
+    }
+  })
+
   const deleteMutation = useMutation({
     mutationFn: (id: string) => api.deleteProject(id),
     onSuccess: () => {
@@ -102,31 +110,37 @@ export default function Projects() {
             </tr>
           </thead>
           <tbody className="divide-y divide-gray-200">
-            {projects && projects.length > 0 ? (
-              projects.map((project: any) => (
-                <tr key={project.id} className="hover:bg-gray-50 transition-colors">
-                  <td className="px-6 py-4 text-sm text-gray-900 font-medium">{project.name}</td>
-                  <td className="px-6 py-4 text-sm text-gray-600">
-                    {customers?.find((c: any) => c.id === project.customerId)?.name || "Unknown Customer"}
-                  </td>
-                  <td className="px-6 py-4 text-right">
-                    <button
-                      onClick={() => {
-                        if (confirm("Are you sure you want to delete this project?")) {
-                          deleteMutation.mutate(project.id)
-                        }
-                      }}
-                      disabled={deleteMutation.isPending}
-                      className="text-red-600 hover:text-red-800 text-sm font-medium disabled:text-gray-400"
-                    >
-                      Delete
-                    </button>
-                  </td>
-                </tr>
-              ))
-            ) : (
+            {projects?.map((project: any) => (
+              <tr key={project.id} className="hover:bg-gray-50 transition-colors">
+                <td className="px-6 py-4 text-sm text-gray-900">{project.name}</td>
+                <td className="px-6 py-4 text-sm text-gray-500">{project.customer?.name || "N/A"}</td>
+                <td className="px-6 py-4 text-right space-x-2">
+                  <button
+                    onClick={() => cloneMutation.mutate(project.id)}
+                    disabled={cloneMutation.isPending}
+                    className="p-2 text-gray-500 hover:text-blue-600 hover:bg-blue-50 rounded-md transition-colors disabled:opacity-50"
+                    title="Clone Project"
+                  >
+                    <Copy className="w-4 h-4" />
+                  </button>
+                  <button
+                    onClick={() => {
+                      if (confirm("Are you sure you want to delete this project?")) {
+                        deleteMutation.mutate(project.id)
+                      }
+                    }}
+                    disabled={deleteMutation.isPending}
+                    className="p-2 text-gray-500 hover:text-red-600 hover:bg-red-50 rounded-md transition-colors disabled:opacity-50"
+                    title="Delete Project"
+                  >
+                    <Trash2 className="w-4 h-4" />
+                  </button>
+                </td>
+              </tr>
+            ))}
+            {projects?.length === 0 && (
               <tr>
-                <td colSpan={3} className="px-6 py-10 text-center text-gray-500">No projects found. Create one above.</td>
+                <td colSpan={3} className="px-6 py-10 text-center text-gray-500">No projects found.</td>
               </tr>
             )}
           </tbody>