diff --git a/.gitignore b/.gitignore
index abc3e9bd1..be33fbc90 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ node_modules
 package-lock.json
 .DS_Store
 *.js.bak
+appdates.csv
diff --git a/bin/pre-publish.sh b/bin/pre-publish.sh
index 47822dbf2..6a80f2516 100755
--- a/bin/pre-publish.sh
+++ b/bin/pre-publish.sh
@@ -5,12 +5,14 @@ node bin/sanitycheck.js || exit 1
 
 echo "Sanity check passed."
 
-echo "Finding most recent apps..."
+echo "Finding app dates..."
 
+# Create list of:
+#   appid,created_time,modified_time
 cd apps
 for appfolder in *; do
-  echo "$(git log --follow --format=%ai $appfolder),$appfolder" | tail -n 1 ; 
-done | grep -v _example_ | sort -r > ../recent.csv
+  echo "$appfolder,$(git log --follow --format=%ai -- $appfolder | tail -n 1),$(git log --follow --format=%ai -- $appfolder | head -n 1)" ; 
+done | grep -v _example_ | grep -v unknown.png > ../appdates.csv
 cd ..
 
 echo "Ready to publish"
diff --git a/index.html b/index.html
index 0d23c2c0b..6d0566d13 100644
--- a/index.html
+++ b/index.html
@@ -95,7 +95,8 @@
         <div class="sort-nav hidden">
           <span>Sort by:</span>
           <label class="chip active" sortid="">None</label>
-          <label class="chip" sortid="new">New</label>
+          <label class="chip" sortid="created">New</label>
+          <label class="chip" sortid="modified">Updated</label>
         </div>
         <div class="filter-nav">
           <label class="chip active" filterid="">Default</label>
diff --git a/js/index.js b/js/index.js
index 94c3e86a4..031391f52 100644
--- a/js/index.js
+++ b/js/index.js
@@ -1,6 +1,6 @@
 var appJSON = []; // List of apps and info from apps.json
 var appsInstalled = []; // list of app JSON
-var appPublishDates = {}; // list of app publish dates from recent.csv
+var appSortInfo = {}; // list of data to sort by, from appdates.csv { created, modified }
 var files = []; // list of files on Bangle
 var DEFAULTSETTINGS = {
   pretokenise : true,
@@ -20,11 +20,14 @@ httpGet("apps.json").then(apps=>{
   refreshFilter();
 });
 
-httpGet("recent.csv").then(csv=>{
+httpGet("appdates.csv").then(csv=>{
   document.querySelector(".sort-nav").classList.remove("hidden");
   csv.split("\n").forEach(line=>{
     var l = line.split(",");
-    appPublishDates[l[1]] = Date.parse(l[0]);
+    appSortInfo[l[0]] = { 
+      created : Date.parse(l[1]), 
+      modified : Date.parse(l[2])
+    };
   });
 }).catch(err=>{
   console.log("No recent.csv - app sort disabled");
@@ -231,8 +234,8 @@ function refreshLibrary() {
 
   if (activeSort) {
     visibleApps = visibleApps.slice(); // clone the array so sort doesn't mess with original
-    if (activeSort=="new") {
-      visibleApps = visibleApps.sort((a,b) => appPublishDates[b.id] - appPublishDates[a.id]);
+    if (activeSort=="created" || activeSort=="modified") {
+      visibleApps = visibleApps.sort((a,b) => appSortInfo[b.id][activeSort] - appSortInfo[a.id][activeSort]);
     } else throw new Error("Unknown sort type "+activeSort);
   }