diff --git a/app/hooks/icons.sh b/app/hooks/icons.sh
index d63e9a1..8ed9976 100644
--- a/app/hooks/icons.sh
+++ b/app/hooks/icons.sh
@@ -23,4 +23,9 @@ convert "$base" -resize '48x48'     -unsharp 1x4 "res/icon/android/Icon-mdpi.png
 convert "$base" -resize '72x72'     -unsharp 1x4 "res/icon/android/Icon-hdpi.png"
 convert "$base" -resize '96x96'     -unsharp 1x4 "res/icon/android/Icon-xhdpi.png"
 convert "$base" -resize '144x144'   -unsharp 1x4 "res/icon/android/Icon-xxhdpi.png"
-convert "$base" -resize '192x192'   -unsharp 1x4 "res/icon/android/Icon-xxxhdpi.png"
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+convert "$base" -resize '192x192'   -unsharp 1x4 "res/icon/android/Icon-xxxhdpi.png"
+
+cd res/icon/ios/
+find -type f -name "*.png" -exec optipng -o7 {} \;
+cd ../android/
+find -type f -name "*.png" -exec optipng -o7 {} \;
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