diff --git a/bb.edn b/bb.edn
index 5545967..f76e437 100644
--- a/bb.edn
+++ b/bb.edn
@@ -44,9 +44,11 @@
         :depends [prod]
         :task (do
                 (fs/delete-tree "dist")
-                (fs/create-dirs "dist")
-                (run! (fn [f] (fs/copy f "dist"))
-                      (fs/glob "resources/public/js" "*.{js,js.map}")))}
+                (fs/create-dirs "dist/dev")
+                (run! (fn [f] (fs/copy f "dist" {:replace-existing true}))
+                      (fs/glob "resources/public/js" "*.{js,js.map}"))
+                (run! (fn [f] (fs/copy f "dist/dev" {:replace-existing true}))
+                      (fs/glob "resources/public/js/dev" "*.{js,js.map}")))}
 
   bump-version {:doc "Bumps package.json and pushes new git tag"
                 :task (do (shell "npm version patch")
diff --git a/build/src/scittle/build.clj b/build/src/scittle/build.clj
index 0998c4c..879d05c 100644
--- a/build/src/scittle/build.clj
+++ b/build/src/scittle/build.clj
@@ -72,4 +72,12 @@
   (build* (format "-M -m shadow.cljs.devtools.cli --force-spawn %s main %s" action (str/join " " args)))
   (when (= "release" action)
     (println "Also building dev release build")
-    (build* (format "-M -m shadow.cljs.devtools.cli --force-spawn %s dev %s" action (str/join " " args)))))
+    (build* (format "-M -m shadow.cljs.devtools.cli --force-spawn %s main %s %s"
+                    action
+                    "--config-merge '{:compiler-options {:optimizations :simple
+                                                         :pretty-print true
+                                                         :pseudo-names true}
+                                      :output-dir \"resources/public/js/dev\"
+                                      :modules {:scittle.cljs-devtools.dev {:entries [scittle.cljs-devtools]
+                                                                            :depends-on #{:scittle}}}}'"
+                    (str/join " " args)))))
diff --git a/shadow-cljs.edn b/shadow-cljs.edn
index 878dbd5..7b6d8c4 100644
--- a/shadow-cljs.edn
+++ b/shadow-cljs.edn
@@ -6,7 +6,11 @@
 
  :builds
  {:main
-  {:target     :browser
+  {;; for dev build
+   #_#_:compiler-options {:optimizations :simple
+                          :pretty-print true
+                          :pseudo-names true}
+   :target     :browser
    :js-options
    {:resolve {"react" {:target :global
                        :global "React"}
@@ -32,39 +36,5 @@
     :scittle.cljs-ajax {:entries [scittle.cljs-ajax]
                         :depends-on #{:scittle}}}
    :build-hooks [(shadow.cljs.build-report/hook)]
-   :output-dir "resources/public/js"
-   :devtools   {:repl-pprint true}}
-  :dev
-  {:compiler-options {:optimizations :simple
-                      :pretty-print true
-                      :pseudo-names true}
-   :target     :browser
-   :js-options
-   {:resolve {"react" {:target :global
-                       :global "React"}
-              "react-dom" {:target :global
-                           :global "ReactDOM"}}}
-   :modules
-   {:scittle.dev {:entries [scittle.core]}
-    :scittle.nrepl.dev {:entries [scittle.nrepl]
-                    :depends-on #{:scittle.dev}}
-    :scittle.promesa.dev {:entries [scittle.promesa]
-                      :depends-on #{:scittle.dev}}
-    :scittle.js-interop.dev {:entries [scittle.js-interop]
-                        :depends-on #{:scittle.dev}}
-    :scittle.pprint.dev {:entries [scittle.pprint]
-                     :depends-on #{:scittle.dev}}
-    :scittle.reagent.dev {:entries [scittle.reagent]
-                      :depends-on #{:scittle.dev}}
-    :scittle.replicant.dev {:entries [scittle.replicant]
-                        :depends-on #{:scittle.dev}}
-    :scittle.re-frame.dev {:entries [scittle.re-frame]
-                       :depends-on #{:scittle.reagent.dev
-                                     :scittle.dev}}
-    :scittle.cljs-ajax.dev {:entries [scittle.cljs-ajax]
-                        :depends-on #{:scittle.dev}}
-    :scittle.cljs-devtools.dev {:entries [scittle.cljs-devtools]
-                                :depends-on #{:scittle.dev}}}
-   :build-hooks [(shadow.cljs.build-report/hook)]
-   :output-dir "resources/public/js"
+   :output-dir "resources/public/js" ;; + "/dev" for dev build
    :devtools   {:repl-pprint true}}}}