Slack Hebrew is a free Chrome add-on developed by shlomomatichin. This add-on is designed to modify the direction to right-to-left (rtl) for messages in Slack that contain Hebrew characters. It allows users to seamlessly switch the direction of the text, ensuring a better reading experience for Hebrew-speaking users.

With Slack Hebrew, users can easily read and comprehend Hebrew messages in Slack without any inconvenience. The add-on automatically detects messages that contain Hebrew characters and applies the rtl style to those messages only. English messages are left untouched, maintaining their original left-to-right (ltr) direction.

This simple and lightweight add-on is a useful tool for Hebrew-speaking Slack users who want to enhance their communication experience. It eliminates the need for manual adjustments and enables smooth reading of Hebrew messages within the Slack web app.

Please note that if you are using the desktop version of Slack, you may consider using the alternative project "onium" available on PyPI.