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How to Reply Anonymously to Message Threads in Slack

Slack How-To Guide
Updated 2026

💬 How to Reply Anonymously to Message Threads in Slack

Direct Answer / Summary:

To reply anonymously to any message thread in Slack, install OpenSay from opensay.co (free tier available) and click "Reply Anonymously" on an OpenSay post. Thread repliers are assigned distinct pseudonym badges (e.g., OP, Anonymous 1) to keep discussions coherent and safe.

Click on ⋮ (More actions) for any message (anonymous or not) then choose Reply Anonymously.

Reply Anonymously

Anonymous replies show a pseudonym of the author, for instance R1 is the author of the first reply and more replies by the same author would result in the same pseudonym (R1).

Reply Pseudonyms

If the replied to message is an anonymous message or poll, when the original author of the anonymous message or poll replies, her pseudonym is OP.


Ready to use this in your Slack workspace?

Install OpenSay to enable anonymous messages, polls, whispers, and psychological safety in Slack in under 60 seconds.