diff --git a/scripts/Set-AppVersion.ps1 b/scripts/Set-AppVersion.ps1
new file mode 100644
index 00000000..cc8a3bc1
--- /dev/null
+++ b/scripts/Set-AppVersion.ps1
@@ -0,0 +1,58 @@
+# Updates the app version in all required places according to the custom value
+
+[CmdletBinding()]
+param (
+    [string]$customversion = ''
+)
+
+if ($customversion) {
+    "`nUser set custom input version: $customversion"
+    $INPUT_VERSION = $customversion
+} else {
+    $init_params = Get-Content -Raw "$PSScriptRoot\..\www\js\app.js"
+    $file_tag = ''
+    if ($init_params -match 'params\[[''"]appVersion[''"]]\s*=\s*[''"]([^''"]+)') {
+        $file_tag = 'v' + $matches[1] 
+    }
+    if ($file_tag) {
+        "`nCurrent app version is: $file_tag"
+        if ($file_tag -match '(^.*\.)([0-9]+)(.*$)') {
+            if ($matches[2]) {
+                $file_tag = $matches[1] + ($matches[2] / 1 + 1) + $matches[3]
+            }
+        }
+    }
+    $tag_name = Read-Host "`nEnter the tag name for this release, Enter to accept suggested tag [$file_tag]"
+    if ($tag_name -eq "") { $tag_name = $file_tag }
+    if ($tag_name -NotMatch '^v?\d+\.\d+\.\d+([+EN-]|$)') {
+        "`nTag name must be in the format " + '"[v]0.0.0"!' + "`n"
+        exit
+    }
+    $INPUT_VERSION = $tag_name
+}
+
+if ($INPUT_VERSION) {
+    $VERSION = $INPUT_VERSION
+} elseif ($TAG_VERSION) {
+    $VERSION = $TAG_VERSION
+}
+
+if ($VERSION -match '^v?[\d.]') {
+    $VERSION = $VERSION -replace '^v', ''
+    "`nSetting App Version to $VERSION in service-worker.js and app.js ..."
+    (Get-Content ./service-worker.js) -replace '(appVersion\s*=\s*["''])[^"'']+', "`${1}$VERSION" | Set-Content ./service-worker.js
+    (Get-Content ./www/js/app.js) -replace '(appVersion..\s*=\s*["''])[^"'']+', "`${1}$VERSION" | Set-Content ./www/js/app.js
+    $FileList = './manifest.json', './manifest.webapp', './ubuntu_touch/manifest.json'
+    ForEach ($File in $FileList) {
+        $FileContent = Get-Content -Raw $File
+        "Setting App Version to $VERSION in $File ..."
+        $FileContent = $FileContent -replace '("version"\s*:\s*")[^"]*', "`${1}$VERSION"
+        # Remove extra whitespace
+        $FileContent = $FileContent -replace '\s+$', ''
+        # DEV: don't set BOM, as Linux tools crash with it
+        Set-Content $File $FileContent
+    }
+    "`nDone. Please check the updated files.`n"
+} else {
+    "No valid INPUT_VERSION or TAG_VERSION were provided. File version numbers were unchanged.`n"
+}
\ No newline at end of file