diff --git a/README.md b/README.md
index 369d3b1..5ed391b 100644
--- a/README.md
+++ b/README.md
@@ -719,6 +719,7 @@ No servers involved. Everything goes directly from one peer to the other peer. N
 #### Android / iOS
 - [🤖](#icons) [FairEmail](https://github.com/M66B/FairEmail) - Fully featured, open source, privacy friendly email app for Android.
 - [🤖](#icons) [K9](https://k9mail.app/) - Open Source Email App for Android.
+- [🤖](#icons) [Planck Secure Email](https://www.planck.security) - A highly-secure email client with automated encryption based on PGP, for Android, iOS and Outlook
 
 #### Desktop
 - [Thunderbird](https://www.thunderbird.net) - A free customizable open source email client.