diff --git a/env/dev/env/main.cljs b/env/dev/env/main.cljs
index afe0ca2..3b30f74 100644
--- a/env/dev/env/main.cljs
+++ b/env/dev/env/main.cljs
@@ -9,8 +9,10 @@
 (defn reloader [] @cnt [core/app-root])
 (def root-el (r/as-element [reloader]))
 
+(def dev-env (js/require "dev-env"))
+
 (figwheel/watch-and-reload
- :websocket-url "ws://c98fe99d.ngrok.io/figwheel-ws"
+ :websocket-url (str "ws://" (.-ip dev-env) ":3449/figwheel-ws")
  :heads-up-display false
  :jsload-callback #(swap! cnt inc))
 
diff --git a/env/dev/user.clj b/env/dev/user.clj
index dad450a..88bcf4c 100644
--- a/env/dev/user.clj
+++ b/env/dev/user.clj
@@ -12,12 +12,23 @@
 
 (def cljs-builds (get-in profiles [:dev :cljsbuild :builds]))
 
+(defn write-dev-env-js
+  "Update target/dev-env.js with dev server info (hostname etc.)"
+  []
+  (spit "target/dev-env.js"
+        (str "/* @providesModule dev-env */\n"
+             "module.exports = {\n"
+             "  hostname: '" (.getHostName (java.net.InetAddress/getLocalHost)) "',\n"
+             "  ip: '" (.getHostAddress (java.net.InetAddress/getLocalHost)) "',\n"
+             "};\n")))
+
 (defn start-figwheel
   "Start figwheel for one or more builds"
   [& build-ids]
   (ra/start-figwheel!
    {:build-ids  build-ids
     :all-builds cljs-builds})
+  (write-dev-env-js)
   (ra/cljs-repl))
 
 (defn stop-figwheel
diff --git a/js/main.js b/js/main.js
index 092179e..4e26069 100644
--- a/js/main.js
+++ b/js/main.js
@@ -4,6 +4,8 @@ const figwheel = true;
 
 if (figwheel) {
   require('figwheel-bridge').withModules({
+    'dev-env': require('../target/dev-env.js'),
+
     'react-native': require('react-native'),
     'react': require('react'),
   }).start('main');