diff --git a/index.js b/index.js
index 242d60b2d..cb9352331 100644
--- a/index.js
+++ b/index.js
@@ -149,19 +149,10 @@ function refreshLibrary() {
   }
 
   panelbody.innerHTML = visibleApps.map((app,idx) => {
-    var icon = "icon-upload";
-    var versionInfo = app.version || "";
-    if (app.custom)
-      icon = "icon-menu";
-    if (appsInstalled.find(a=>a.id==app.id)) {
-      icon = "icon-delete";
-      versionInfo+=" installed";
-    }
-    var buttons = "";
+    var appInstalled = appsInstalled.find(a=>a.id==app.id);
+    var version = getVersionInfo(app, appInstalled);
+    var versionInfo = version.text;
     if (versionInfo) versionInfo = " <small>("+versionInfo+")</small>";
-    if (app.allow_emulator)
-      buttons += `<button class="btn btn-link btn-action btn-lg" title="Try in Emulator"><i class="icon icon-share" appid="${app.id}"></i></button>`;
-    buttons += `<button class="btn btn-link btn-action btn-lg"><i class="icon ${icon}" appid="${app.id}"></i></button>`;
     return `<div class="tile column col-6 col-sm-12 col-xs-12">
     <div class="tile-icon">
       <figure class="avatar"><img src="apps/${app.icon?`${app.id}/${app.icon}`:"unknown.png"}" alt="${escapeHtml(app.name)}"></figure>
@@ -171,7 +162,11 @@ function refreshLibrary() {
       <p class="tile-subtitle">${escapeHtml(app.description)}</p>
     </div>
     <div class="tile-action">
-      ${buttons}
+      <button class="btn btn-link btn-action btn-lg ${app.allow_emulator?"":"d-hide"}" appid="${app.id}" title="Try in Emulator"><i class="icon icon-share"></i></button>
+      <button class="btn btn-link btn-action btn-lg ${version.canUpdate?"":"d-hide"}" appid="${app.id}" title="Update App"><i class="icon icon-refresh"></i></button>
+      <button class="btn btn-link btn-action btn-lg ${!appInstalled?"":"d-hide"}" appid="${app.id}" title="Upload App"><i class="icon icon-upload"></i></button>
+      <button class="btn btn-link btn-action btn-lg ${appInstalled?"":"d-hide"}" appid="${app.id}" title="Remove App"><i class="icon icon-delete"></i></button>
+      <button class="btn btn-link btn-action btn-lg ${app.custom?"":"d-hide"}" appid="${app.id}" title="Customise and Upload App"><i class="icon icon-menu"></i></button>
     </div>
   </div>
   `;}).join("");
@@ -181,10 +176,12 @@ function refreshLibrary() {
   tab.setAttribute("data-badge", appJSON.length);
   htmlToArray(panelbody.getElementsByTagName("button")).forEach(button => {
     button.addEventListener("click",event => {
-      var icon = event.target;
-      var appid = icon.getAttribute("appid");
-      var app = appJSON.find(app=>app.id==appid);
-      if (!app) return;
+      var button = event.currentTarget;
+      var icon = button.firstChild;
+      var appid = button.getAttribute("appid");
+      var app = appNameToApp(appid);
+      if (!app) throw new Error("App "+appid+" not found");
+      // check icon to figure out what we should do
       if (icon.classList.contains("icon-share")) {
         // emulator
         var file = app.storage.find(f=>f.name[0]=='-');
@@ -196,6 +193,7 @@ function refreshLibrary() {
         var url = baseurl+"apps/"+app.id+"/"+file.url;
         window.open(`https://espruino.com/ide/emulator.html?codeurl=${url}&upload`);
       } else if (icon.classList.contains("icon-upload")) {
+        // upload
         icon.classList.remove("icon-upload");
         icon.classList.add("loading");
         Comms.uploadApp(app).then((appJSON) => {
@@ -204,12 +202,14 @@ function refreshLibrary() {
           icon.classList.remove("loading");
           icon.classList.add("icon-delete");
           refreshMyApps();
+          refreshLibrary();
         }).catch(err => {
           showToast("Upload failed, "+err, "error");
           icon.classList.remove("loading");
           icon.classList.add("icon-upload");
         });
       } else if (icon.classList.contains("icon-menu")) {
+        // custom HTML update
         if (app.custom) {
           icon.classList.remove("icon-menu");
           icon.classList.add("loading");
@@ -219,16 +219,23 @@ function refreshLibrary() {
             icon.classList.remove("loading");
             icon.classList.add("icon-delete");
             refreshMyApps();
+            refreshLibrary();
           }).catch(err => {
             showToast("Customise failed, "+err, "error");
             icon.classList.remove("loading");
             icon.classList.add("icon-menu");
           });
         }
-      } else {
+      } else if (icon.classList.contains("icon-delete")) {
+        // Remove app
         icon.classList.remove("icon-delete");
         icon.classList.add("loading");
         removeApp(app);
+      } else if (icon.classList.contains("icon-refresh")) {
+        // Update app
+        icon.classList.remove("icon-refresh");
+        icon.classList.add("loading");
+        updateApp(app);
       }
     });
   });
@@ -239,14 +246,29 @@ refreshLibrary();
 
 function removeApp(app) {
   return showPrompt("Delete","Really remove '"+app.name+"'?").then(() => {
-    Comms.removeApp(app).then(()=>{
-      appsInstalled = appsInstalled.filter(a=>a.id!=app.id);
-      showToast(app.name+" removed successfully","success");
-      refreshMyApps();
-      refreshLibrary();
-    }, err=>{
-      showToast(app.name+" removal failed, "+err,"error");
-    });
+    return Comms.removeApp(app);
+  }).then(()=>{
+    appsInstalled = appsInstalled.filter(a=>a.id!=app.id);
+    showToast(app.name+" removed successfully","success");
+    refreshMyApps();
+    refreshLibrary();
+  }, err=>{
+    showToast(app.name+" removal failed, "+err,"error");
+  });
+}
+
+function updateApp(app) {
+  Comms.removeApp(app).then(()=>{
+    showToast(app.name+" removed successfully. Updating...",);
+    appsInstalled = appsInstalled.filter(a=>a.id!=app.id);
+    return Comms.uploadApp(app);
+  }).then((appJSON) => {
+    if (appJSON) appsInstalled.push(appJSON);
+    showToast(app.name+" Updated!", "success");
+    refreshMyApps();
+    refreshLibrary();
+  }, err=>{
+    showToast(app.name+" update failed, "+err,"error");
   });
 }
 
@@ -281,34 +303,31 @@ function refreshMyApps() {
   tab.setAttribute("data-badge", appsInstalled.length);
   panelbody.innerHTML = appsInstalled.map(appJSON => {
 var app = appNameToApp(appJSON.id);
-var version = "";
-if (!appJSON.version) {
-  version = "Unknown version";
-  if (app.version) version += ", latest "+app.version;
-} else {
-  version = appJSON.version;
-  if (app.version == appJSON.version) version += ", up to date";
-  else if (app.version) version += ", latest "+app.version;
-}
+var version = getVersionInfo(app, appJSON);
 return `<div class="tile column col-6 col-sm-12 col-xs-12">
     <div class="tile-icon">
       <figure class="avatar"><img src="apps/${app.icon?`${app.id}/${app.icon}`:"unknown.png"}" alt="${escapeHtml(app.name)}"></figure>
     </div>
     <div class="tile-content">
-      <p class="tile-title text-bold">${escapeHtml(app.name)} <small>(${version})</small></p>
+      <p class="tile-title text-bold">${escapeHtml(app.name)} <small>(${version.text})</small></p>
       <p class="tile-subtitle">${escapeHtml(app.description)}</p>
     </div>
     <div class="tile-action">
-      <button class="btn btn-link btn-action btn-lg"><i class="icon icon-delete" appid="${app.id}"></i></button>
+      <button class="btn btn-link btn-action btn-lg ${version.canUpdate?'':'d-hide'}" appid="${app.id}" title="Update App"><i class="icon icon-refresh"></i></button>
+      <button class="btn btn-link btn-action btn-lg" appid="${app.id}" title="Remove App"><i class="icon icon-delete"></i></button>
     </div>
   </div>
   `}).join("");
   htmlToArray(panelbody.getElementsByTagName("button")).forEach(button => {
     button.addEventListener("click",event => {
-      var icon = event.target;
-      var appid = icon.getAttribute("appid");
+      var button = event.currentTarget;
+      var icon = button.firstChild;
+      var appid = button.getAttribute("appid");
       var app = appNameToApp(appid);
-      removeApp(app);
+      if (!app) throw new Error("App "+appid+" not found");
+      // check icon to figure out what we should do
+      if (icon.classList.contains("icon-delete")) removeApp(app);
+      if (icon.classList.contains("icon-refresh")) updateApp(app);
     });
   });
 }
diff --git a/utils.js b/utils.js
index 86e8db3e2..699b247a9 100644
--- a/utils.js
+++ b/utils.js
@@ -42,3 +42,24 @@ function appSorter(a,b) {
   if (sa>sb) return 1;
   return (a.name==b.name) ? 0 : ((a.name<b.name) ? -1 : 1);
 }
+
+/* Given 2 JSON structures (1st from apps.json, 2nd from an installed app)
+work out what to display re: versions and if we can update */
+function getVersionInfo(appListing, appInstalled) {
+  var versionText = "";
+  var canUpdate = false;
+  if (!appInstalled) {
+    if (appListing.version)
+      versionText = "v"+appListing.version;
+  } else {
+    versionText = (appInstalled.version ? ("v"+appInstalled.version) : "Unknown version");
+    if (appListing.version != appInstalled.version) {
+      if (appListing.version) versionText += ", latest "+appListing.version;
+      canUpdate = true;
+    }
+  }
+  return {
+    text : versionText,
+    canUpdate : canUpdate
+  }
+}