diff --git a/README.md b/README.md
index b5a4c35..43776f8 100644
--- a/README.md
+++ b/README.md
@@ -1,18 +1,24 @@
 # SailOTP
 
-SailOTP is a Sailfish Implementation of the Google-Authenticator algorithm,
-also known as Timebased One Time Pad (TOPT) as described in RFC 6238. A growing
+SailOTP is a Sailfish Implementation of the Google-Authenticator algorithms,
+also known as TOPT (timer based) and HOTP (counter based) as described in RFC 6238 and 4226. A growing
 number of sites uses this algorithm for two-factor-authentication, including
 Github, Linode and several Google services.
 
-One can add new OTP-entries using the pulley-menu. The main view of the app will show a list 
-off all entries and their current One-Time-Tokens. The entries will be regenerated every 30 seconds, 
-the remaining time for the current tokens is shown through a progress bar at the top of the app. 
+One can add new OTP-entries using the pulley-menu. The type of token can be selected. Title and the shared
+secret have to be provided. For counter based HOTP-tokens the counter value for the next update of the
+Token can be set. The default of 1 is the standard value for new HOTP-tokens and should not be changed.
+
+The main view of the app will show a list off all entries and their current One-Time-Tokens. 
+The entries will be regenerated every 30 seconds, the remaining time for the current tokens is shown 
+through a progress bar at the top of the app. HOTP-type tokens are not updated automatically, instead
+a refresh button is shown on the right of the token to calculate the next value and increment the counter
 An entry can be edited or deleted by long-pressing on it.
 
 One entry can be stared by tapping the star icon on the left. the stared item will be shown
-on the ActiveCover and refreshed every 30 seconds. 5 seconds before the token changes it's
-color will change to red. The Item can be unstared by tapping it again.
+on the ActiveCover. If the Token is timer based, it will be refreshed every 30 seconds. 5 seconds before the token changes it's
+color will change to red. For counter based tokens a cover action to calculate the next token is shown instead.
+The item can be unstared by tapping the star icon again on the main view.
 
 From the main view a token can be copied to the clipboard by tapping on it.
 
diff --git a/qml/cover/CoverPage.qml b/qml/cover/CoverPage.qml
index 1388668..7d504ee 100644
--- a/qml/cover/CoverPage.qml
+++ b/qml/cover/CoverPage.qml
@@ -30,6 +30,7 @@
 import QtQuick 2.0
 import Sailfish.Silica 1.0
 import "../lib/crypto.js" as OTP
+import "../lib/storage.js" as DB
 
 // Define the Layout of the Active Cover
 CoverBackground {
@@ -40,14 +41,14 @@ CoverBackground {
   Timer {
     interval: 1000
     // Timer runs only when cover is visible and favourite is set
-    running: !Qt.application.active && appWin.coverSecret != ""
+    running: !Qt.application.active && appWin.coverSecret != "" && appWin.coverType == "TOTP"
     repeat: true
     onTriggered: {
       // get seconds from current Date
       var curDate = new Date();
 
-      if (lOTP.text == "" || curDate.getSeconds() == 30 || curDate.getSeconds() == 0 || (curDate.getTime() - lastUpdated > 2000)) {
-        appWin.coverOTP = OTP.calcOTP(appWin.coverSecret);
+      if (lOTP.text == "------" || curDate.getSeconds() == 30 || curDate.getSeconds() == 0 || (curDate.getTime() - lastUpdated > 2000)) {
+        appWin.coverOTP = OTP.calcOTP(appWin.coverSecret, "TOTP", 0);
       }
 
       // Change color of the OTP to red if less than 5 seconds left
@@ -88,4 +89,14 @@ CoverBackground {
       font.pixelSize: Theme.fontSizeExtraLarge
     }
   }
+  // CoverAction to update a HOTP-Token, only visible for HOTP-Type Tokens
+  CoverActionList {
+    enabled: appWin.coverType == "HOTP" ? true : false
+    CoverAction {
+      iconSource: "image://theme/icon-m-refresh"
+      onTriggered: {
+        appWin.coverOTP = OTP.calcOTP(appWin.coverSecret, "HOTP", DB.getCounter(appWin.coverTitle, appWin.coverSecret, true));
+      }
+    }
+  }
 }
diff --git a/qml/harbour-sailotp.qml b/qml/harbour-sailotp.qml
index 2b9c122..db90a21 100644
--- a/qml/harbour-sailotp.qml
+++ b/qml/harbour-sailotp.qml
@@ -38,7 +38,8 @@ ApplicationWindow
   // Properties to pass values between MainPage and Cover
   property string coverTitle: "SailOTP"
   property string coverSecret: ""
-  property string coverOTP: ""
+  property string coverType: ""
+  property string coverOTP: "------"
 
   initialPage: Component { MainView { } }
   cover: Qt.resolvedUrl("cover/CoverPage.qml")
diff --git a/qml/lib/crypto.js b/qml/lib/crypto.js
index d518466..ca867ae 100644
--- a/qml/lib/crypto.js
+++ b/qml/lib/crypto.js
@@ -66,18 +66,27 @@ function leftpad(str, len, pad) {
 // *** Main Function *** //
 
 // Calculate an OTP-Value from the given secret
-// Parameter is the secret key in Base32-notation
-function calcOTP(secret) {
+// Parameters are:
+//   secret: The secret key in Base32-Notation
+//   tpye: either TOTP for timer based or HOTP for counter based calculation
+//   counter: counter value for HOTP
+function calcOTP(secret, type, counter) {
   // Convert the key to HEX
   var key = base32tohex(secret);
-  // Get current Time in UNIX Timestamp format (Seconds since 01.01.1970 00:00 UTC)
-  var epoch = Math.round(new Date().getTime() / 1000.0);
-  // Get last full 30 / 60 Seconds and convert to HEX
-  var time = leftpad(dec2hex(Math.floor(epoch / 30)), 16, '0');
+  var factor = "";
+
+  if (type == "TOTP") {
+    // Get current Time in UNIX Timestamp format (Seconds since 01.01.1970 00:00 UTC)
+    var epoch = Math.round(new Date().getTime() / 1000.0);
+    // Get last full 30 / 60 Seconds and convert to HEX
+    factor = leftpad(dec2hex(Math.floor(epoch / 30)), 16, '0');
+  } else {
+    factor = leftpad(dec2hex(counter), 16, '0');
+  }
 
   try {
     // Calculate the SHA-1 HMAC Value from time and key
-    var hmacObj = new SHA.jsSHA(time, 'HEX');
+    var hmacObj = new SHA.jsSHA(factor, 'HEX');
     var hmac = hmacObj.getHMAC(key, 'HEX', 'SHA-1', "HEX");
 
     // Finally convert the HMAC-Value to the corresponding 6-digit token
diff --git a/qml/lib/storage.js b/qml/lib/storage.js
index 8dabb15..bda96e4 100644
--- a/qml/lib/storage.js
+++ b/qml/lib/storage.js
@@ -68,19 +68,19 @@ function getOTP() {
       var res = tx.executeSql("select * from OTPStorage;");
       for (var i=0; i < res.rows.length; i++) {
         mainPage.appendOTP(res.rows.item(i).title, res.rows.item(i).secret, res.rows.item(i).type, res.rows.item(i).counter, res.rows.item(i).fav);
-        if (res.rows.item(i).fav) mainPage.setCoverOTP(res.rows.item(i).title, res.rows.item(i).secret);
+        if (res.rows.item(i).fav) mainPage.setCoverOTP(res.rows.item(i).title, res.rows.item(i).secret, res.rows.item(i).type);
       }
     }
   )
 }
 
 // Add a new OTP
-function addOTP(title, secret) {
+function addOTP(title, secret, type, counter) {
   var db = getDB();
 
   db.transaction(
     function(tx) {
-      tx.executeSql("INSERT INTO OTPStorage VALUES(?, ?, ?, ?, ?);", [title, secret, 'TOTP', 0, 0]);
+      tx.executeSql("INSERT INTO OTPStorage VALUES(?, ?, ?, ?, ?);", [title, secret, type, counter, 0]);
     }
   )
 }
@@ -118,12 +118,29 @@ function resetFav(title, secret) {
 }
 
 // Change an existing OTP
-function changeOTP(title, secret, oldtitle, oldsecret) {
+function changeOTP(title, secret, type, counter, oldtitle, oldsecret) {
   var db = getDB();
 
   db.transaction(
     function(tx) {
-      tx.executeSql("UPDATE OTPStorage SET title=?, secret=? WHERE title=? and secret=?;", [title, secret, oldtitle, oldsecret]);
+      tx.executeSql("UPDATE OTPStorage SET title=?, secret=?, type=?, counter=? WHERE title=? and secret=?;", [title, secret, type, counter, oldtitle, oldsecret]);
     }
   )
 }
+
+
+// Get the counter for a HOTP value, incerment the counter on request
+function getCounter(title, secret, increment) {
+  var db = getDB();
+
+  var res = "";
+
+  db.transaction(
+    function(tx) {
+      res = tx.executeSql("SELECT counter FROM OTPStorage where title=? and secret=?;", [title, secret]);
+      if (increment) tx.executeSql("UPDATE OTPStorage set counter=counter+1 WHERE title=? and secret=?;", [title, secret]);
+    }
+  )
+
+  return res.rows.item(0).counter;
+}
diff --git a/qml/pages/About.qml b/qml/pages/About.qml
index bd5263f..d2dcf17 100644
--- a/qml/pages/About.qml
+++ b/qml/pages/About.qml
@@ -44,14 +44,14 @@ Page {
     anchors.horizontalCenter: parent.horizontalCenter
     y: 320
     font.bold: true
-    text: "SailOTP 0.3"
+    text: "SailOTP 0.4"
   }
   Text {
     id: desc
     anchors.horizontalCenter: parent.horizontalCenter
     anchors.top: name.bottom
     anchors.topMargin: 20
-    text: "A Simple Sailfish TOTP Generator<br />(RFC 6238 compatible)"
+    text: "A Simple Sailfish OTP Generator<br />(RFC 6238/4226 compatible)"
     color: "white"
   }
   Text {
diff --git a/qml/pages/AddOTP.qml b/qml/pages/AddOTP.qml
index c68afae..a96b3b1 100644
--- a/qml/pages/AddOTP.qml
+++ b/qml/pages/AddOTP.qml
@@ -40,8 +40,10 @@ Dialog {
   property QtObject parentPage: null
 
   // If we want to edit a Key we get title and key from the calling page
+  property string paramType: "TOTP"
   property string paramLabel: ""
   property string paramKey: ""
+  property int paramCounter: 1 // New Counters start at 1
 
   SilicaFlickable {
     id: addOtpList
@@ -54,6 +56,15 @@ Dialog {
       DialogHeader {
         acceptText: paramLabel != "" ? "Save" : "Add"
       }
+
+      ComboBox {
+        id: typeSel
+        label: "Type"
+        menu: ContextMenu {
+          MenuItem { text: "Time-based (TOTP)"; onClicked: { paramType = "TOTP" } }
+          MenuItem { text: "Counter-based (HOTP)"; onClicked: { paramType = "HOTP" } }
+        }
+      }
       TextField {
         id: otpLabel
         width: parent.width
@@ -72,11 +83,23 @@ Dialog {
         focus: true
         horizontalAlignment: TextInput.AlignLeft
       }
+      TextField {
+        id: otpCounter
+        width: parent.width
+        visible: paramType == "HOTP" ? true : false
+        label: "Next Counter Value"
+        text: paramCounter
+        placeholderText: "Next Value of the Counter"
+        focus: true
+        horizontalAlignment: TextInput.AlignLeft
+        validator: IntValidator { bottom: 0 }
+      }
+      Component.onCompleted: { typeSel.currentIndex = paramType == "HOTP" ? 1 : 0 }
     }
   }
 
   // Check if we can Save
-  canAccept: otpLabel.text.length > 0 && otpSecret.text.length >= 16 ? true : false
+  canAccept: otpLabel.text.length > 0 && otpSecret.text.length >= 16 && (paramType == "TOTP" || otpCounter.text.length > 0) ? true : false
 
   // Save if page is Left with Add
   onDone: {
@@ -84,10 +107,10 @@ Dialog {
 			// Save the entry to the Config DB
       if (paramLabel != "" && paramKey != "") {
         // Parameters where filled -> Change existing entry
-        DB.changeOTP(otpLabel.text, otpSecret.text, paramLabel, paramKey)
+        DB.changeOTP(otpLabel.text, otpSecret.text, paramType, otpCounter.text, paramLabel, paramKey)
       } else {
         // There were no parameters -> Add new entry
-        DB.addOTP(otpLabel.text, otpSecret.text);
+        DB.addOTP(otpLabel.text, otpSecret.text, paramType, otpCounter.text);
       }
 			// Refresh the main Page
       parentPage.refreshOTPList();
diff --git a/qml/pages/MainView.qml b/qml/pages/MainView.qml
index a9c7787..eb46901 100644
--- a/qml/pages/MainView.qml
+++ b/qml/pages/MainView.qml
@@ -45,14 +45,19 @@ Page {
 
   // Add an entry to the list
   function appendOTP(title, secret, type, counter, fav) {
-    otpListModel.append({"secret": secret, "title": title, "fav": fav, "otp": ""});
+    otpListModel.append({"secret": secret, "title": title, "fav": fav, "type": type, "counter": counter, "otp": "------"});
   }
 
   // Hand favorite over to the cover
-  function setCoverOTP(title, secret) {
+  function setCoverOTP(title, secret, type) {
     appWin.coverTitle = title
     appWin.coverSecret = secret
-    if (secret == "") appWin.coverOTP = ""
+    appWin.coverType = type
+    if (secret = "") {
+      appWin.coverOTP = "";
+    } else if (type == "HOTP") {
+      appWin.coverOTP = "------";
+    }
   }
 
   // Reload the List of OTPs from storage
@@ -72,10 +77,15 @@ Page {
 
 		// Iterate over all List entries
     for (var i=0; i<otpListModel.count; i++) {
-			// Only update on full 30 / 60 Seconds or if last run of the Functions is more than 2s in the past (e.g. app was in background)
-      if (otpListModel.get(i).otp == "" || seconds == 30 || seconds == 0 || (curDate.getTime() - lastUpdated > 2000)) {
-        var curOTP = OTP.calcOTP(otpListModel.get(i).secret)
-        otpListModel.setProperty(i, "otp", curOTP);
+      if (otpListModel.get(i).type == "TOTP") {
+        // Only update on full 30 / 60 Seconds or if last run of the Functions is more than 2s in the past (e.g. app was in background)
+        if (otpListModel.get(i).otp == "------" || seconds == 30 || seconds == 0 || (curDate.getTime() - lastUpdated > 2000)) {
+          var curOTP = OTP.calcOTP(otpListModel.get(i).secret, "TOTP")
+          otpListModel.setProperty(i, "otp", curOTP);
+        }
+      } else if (appWin.coverType == "HOTP" && (curDate.getTime() - lastUpdated > 2000) && otpListModel.get(i).fav == 1) {
+        // If we are coming back from the CoverPage update OTP value if current favourite is HOTP
+        otpListModel.setProperty(i, "otp", appWin.coverOTP);
       }
     }
 
@@ -86,7 +96,7 @@ Page {
   }
 
   Timer {
-    interval: 1000
+    interval: 500
     // Timer only runs when app is acitive and we have entries
     running: Qt.application.active && otpListModel.count
     repeat: true
@@ -159,7 +169,8 @@ Page {
             onClicked: {
               if (fav == 0) {
                 DB.setFav(title, secret)
-                setCoverOTP(title, secret)
+                setCoverOTP(title, secret, type)
+                if (type == "HOTP") appWin.coverOTP = otp
                 for (var i=0; i<otpListModel.count; i++) {
                   if (i != index) {
                     otpListModel.setProperty(i, "fav", 0);
@@ -169,7 +180,7 @@ Page {
                 }
               } else {
                 DB.resetFav(title, secret)
-                setCoverOTP("SailOTP", "")
+                setCoverOTP("SailOTP", "", "")
                 otpListModel.setProperty(index, "fav", 0);
               }
             }
@@ -195,13 +206,25 @@ Page {
           }
         }
 
+        // Show an update button on HTOP-Type Tokens
+        IconButton {
+          icon.source: "image://theme/icon-m-refresh"
+          anchors.right: parent.right
+          visible: type == "HOTP" ? true : false
+          onClicked: {
+            otpListModel.setProperty(index, "counter", DB.getCounter(title, secret, true));
+            otpListModel.setProperty(index, "otp", OTP.calcOTP(secret, "HOTP", counter));
+            if (fav == 1) appWin.coverOTP = otp;
+          }
+        }
+
         Component {
           id: otpContextMenu
           ContextMenu {
             MenuItem {
               text: "Edit"
               onClicked: {
-                pageStack.push(Qt.resolvedUrl("AddOTP.qml"), {parentPage: mainPage, paramLabel: title, paramKey: secret})
+                pageStack.push(Qt.resolvedUrl("AddOTP.qml"), {parentPage: mainPage, paramLabel: title, paramKey: secret, paramType: type, paramCounter: DB.getCounter(title, secret, false)})
               }
             }
             MenuItem {
diff --git a/rpm/harbour-sailotp.yaml b/rpm/harbour-sailotp.yaml
index fe70ee5..a48c866 100644
--- a/rpm/harbour-sailotp.yaml
+++ b/rpm/harbour-sailotp.yaml
@@ -1,6 +1,6 @@
 Name: harbour-sailotp
 Summary: SailOTP
-Version: 0.3
+Version: 0.4
 Release: 1
 Group: Security
 URL: https://github.com/seiichiro0185/sailotp/
@@ -8,7 +8,7 @@ License: "BSD\t"
 Sources:
 - '%{name}-%{version}.tar.bz2'
 Description: |
-  A Sailfish implementation of the Timebased One Time Pad algorithm as used by Google Authenticator and a growing number of Websites.
+  A Sailfish implementation of the One Time Pad algorithm as used by Google Authenticator and a growing number of Websites.
 Configure: none
 Builder: qtc5
 PkgConfigBR: