How to Write Slack Messages with OpenAI on Mac
Use OpenAI's GPT models inside Echoo to draft clear, professional Slack messages instantly from any Mac app. Highlight a thread, press a shortcut, and get a polished reply without switching windows.
Why This Combination Works
OpenAI's GPT-4o strikes the ideal balance between speed and nuance for workplace messaging. It reliably captures tone — whether you need something casual for a teammate or buttoned-up for a cross-functional channel. The model also handles context-heavy threads well, producing replies that feel like natural continuations of the conversation.
Recommended Model
GPT-4o — it processes long Slack threads quickly while maintaining conversational tone and context awareness, making it the best all-around choice for workplace messaging.
Example Prompt
Write a brief, natural Slack reply to a teammate who asked whether we should push the release to next week. Agree, but suggest we use the extra time to add the onboarding tooltip fixes.
Setup Steps
Download Echoo
Install Echoo from echoo.ai and launch it from your menu bar. The app runs quietly in the background, ready whenever you need it.
Add your OpenAI API key
Open Echoo settings, navigate to AI Providers, select OpenAI, and paste your API key. Choose GPT-4o as your default model.
Set up a Slack reply command
Create a custom command with a system prompt like "Write a concise, friendly Slack reply matching the tone of the thread." Assign it a memorable name.
Use the keyboard shortcut
Select a Slack message or thread, press your assigned hotkey, and Echoo replaces your selection with a polished reply — or copies it to your clipboard.
Frequently Asked Questions
Yes. GPT-4o adapts its register based on the thread context you select. Engineering channels get concise, technical replies while general channels get warmer, conversational ones. You can further tune this in your command's system prompt.
GPT-4o typically returns a Slack-length reply in under two seconds. Since Echoo streams the response, you see the text appear almost immediately after pressing your shortcut.
Echoo sends only the text you explicitly select to the OpenAI API for processing. No background monitoring or automatic data collection occurs. Your API key connects directly to your own OpenAI account.
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Ready to Try It?
Download Echoo for free and start transforming text with AI shortcuts.