diff --git a/apps.json b/apps.json
index b849820e7..75bebe919 100644
--- a/apps.json
+++ b/apps.json
@@ -267,7 +267,7 @@
   { "id": "stetho",
     "name": "Stethoscope",
     "icon": "stetho.png",
-    "version":"0.019",
+    "version":"0.0191",
     "description": "Hear your heart rate",
     "tags": "health",
     "storage": [
diff --git a/apps/stetho/stetho.js b/apps/stetho/stetho.js
index 0059fd43e..10891fb75 100644
--- a/apps/stetho/stetho.js
+++ b/apps/stetho/stetho.js
@@ -10,7 +10,7 @@ var hrm;
 var SPEAKER_PIN = D18;
 
 function freq(f) {
- console.log("frequency : ", f);
+ console.log("frequency: ", f);
  if (f===0) digitalWrite(SPEAKER_PIN, 0);
   else analogWrite(SPEAKER_PIN, 0.5, {freq: f});
 }
@@ -25,7 +25,7 @@ function readHRM() {
     g.clearRect(0,100,239,239);
     g.moveTo(-100,0);
   }
-  let frequency = parseFloat(y+1.0) * 10000;
+  let frequency = parseFloat((170 - (a*960*4)) + 500);
   if(frequency > 0) freq(frequency);
 
   g.setColor(1,1,1);