Now on the Chrome Web Store · writes with you, never for you

Stop typing, Start Slacking.

The AI copilot for Slack and Gmail that drafts and rewrites replies in your own voice, at the speed of Tab.

Download for Mac Get the Extension See it in action
macOS 15+ · Apple Silicon Free · no credit card You press send
The problem

The hard part of Slack isn't reading it. It's writing back.

Three reasons replying quietly eats your day.

01

The blank composer tax.

You know roughly what to say. You just don't want to type it out for the tenth time today. So the message sits, and the thread goes cold.

02

Every short reply has a long tail.

Re-reading the thread, matching the right register, getting the phrasing right. A two-line answer still costs you a full context switch.

03

Generic AI sounds nothing like you.

Off-the-shelf assistants reply in a flat, anodyne voice. Paste that into a customer thread and it costs you credibility instead of saving you time.

How it works

It writes in the box you're already typing in.

No new inbox, no queue to manage. Slacking lives in Slack's composer and helps the moment you start a reply.

Step 01 / Type

Start the reply. See the rest.

Slacking mirrors your draft and predicts what comes next from the visible thread. Accept the ghost suffix with Tab, or get a full first draft when the box is still empty.

Confirmed. Staging build will be in your hands by Thursday EOD, with a buffer before Friday.
Tab to acceptghost ready
Step 02 / Rewrite

Or draft it in the panel.

Empty box, or a rough line you want to polish? Hit Generate a reply or Rewrite my draft in the Slacking panel. It hands back a couple of labeled takes in your voice. Replace your draft with one, or Copy it.

ConciseReplace draft
FriendlyCopy
Two takes · your voiceon click
Step 03 / Send

You press send. Always.

Slacking only ever fills the Slack composer. It never clicks send, never posts in the background. Nothing leaves your keyboard until you decide it's right.

Draft in composerready
Auto-sendnever
You press sendalways
Features

Built around a handful of small product decisions.

Each does one thing well, with a deliberate boundary on what it won't do for you.

01 / Ghost Autocomplete

Finish the thought as you type.

Start a reply and Slacking predicts the rest from the visible thread. Accept the ghost suffix with Tab, or just keep typing to ignore it. Turn it on or off, and choose how much context it reads: the last 5, 10, or 20 messages.

Composer · ghost prediction on · 10 msgs
Confirmed. Staging build will be in your hands by Thursday EOD, so you have a buffer before Friday's customer update.
· Tab to accept· Esc to dismiss· Fires only while you type
02 / Reply From A Blank Box

Empty composer? Get a first draft from the thread.

Haven't typed anything yet? Slacking reads the visible conversation and writes a complete reply in your tone, grounded in the thread, with a source summary so you can see what it drew on before you edit and send.

Generate a reply · in your toneSlacking panel
Concise
Thanks for the context. I can review this today and confirm by EOD, and will reply here once the staging build passes the smoke tests.
CopyInsert
· Based on the visible Slack thread (#launch-q3)
03 / Rewrite My Draft

Polish your own message before it goes out.

Writing the first message, not replying? Type a rough version, hit Rewrite my draft, and get a couple of cleaner takes in your voice. Pick one to Replace your draft, or Copy it. It only fires when you click, never on a typing pause.

Rewrite my draftReplaces your composer text
hey can u get me the staging build status, customer keeps asking and i need to tell them smth today
Tighter
Quick status check. When do you expect the staging build to land? A customer's waiting on it and I'd like to give them a date today.
CopyReplace draft
04 / Personal Tone Style

It reads how you write, not how everyone writes.

Once you connect Slack and opt in, it learns from your own sent messages (sentence length, openers, formality, recurring phrases) and keeps that private profile tied to your account. Visible to you, and clearable in one click.

Tone profile · @you Private
Sentence lengthShort · 9 words avg
GreetingDrops 'Hi' in DMs
FormalityCasual · low
Sign-offsNone · 92%
Live demo

Pick a real situation. See the draft.

Four scenarios most Slack-heavy teams hit weekly. Everything below is editable. The product behaves the same way.

#launch-q3
Slacking · on
MC
Maya Chen11:42 AM
Can you confirm we're shipping the staging build by Friday? Customer ABC flagged this as a launch blocker.
BIS ≡•{ } 🔗
Message Maya Chen
＋📎＠＃🙂 You press send
Slackıng Idle
BASICactive
ComposerYour draft rewrite
Hit Generate a reply to draft a response to the latest message.
Confirm
Confirmed. Staging build will be in your hands by Thursday EOD, so you have a buffer before the customer update on Friday.
Based on the visible Slack thread
You always send manually
Now on macOS

The same copilot, in a home of its own.

A native Mac app puts everything Slacking knows about you in one Console: plan, workspaces, and your private tone profile.

Right inside the Slack desktop app.
Inline grey ghost text in the native Slack client. Tab to accept. A global hotkey ⌃⌥⌘Space drafts or rewrites in other Mac text fields too.
One Console for everything.
Plan and usage, connected workspaces, permissions, and your private tone profile, all in one window. The same account as the Chrome extension.
It can't send for you, by design.
Never-auto-send is enforced by three independent layers: a state machine, text-only insertion, and a source lint that blocks send keycodes. It only ever inserts editable text. You press send.
Private & minimal.
Your tone profile is private and clearable in a click. Only Accessibility and (optionally) Input Monitoring. No Screen Recording, Full Disk, or Contacts. macOS 15+, Apple Silicon.
Download for Mac Free · macOS 15+ · Apple Silicon
Your tone profile is private. View it, re-scan, or clear it anytime.
Who uses it

Built for people whose calendar is Slack.

Founders
Reply to investors and customers in your own voice in seconds, not after a context switch.
Used most for: customer escalations, board updates
Engineering managers
Knock out PR pings, status asks, and on-call logistics without breaking flow.
Used most for: PR pings, on-call handoffs
Product managers
Keep stakeholder threads moving with replies that match each room's tone.
Used most for: spec questions, sales-eng requests
Customer-facing teams
Answer internal escalations and SE asks in the customer's voice, not a canned script.
Used most for: account threads, post-call follow-ups
The boundary

Auto Drafter never sends for you.

Slacking is a writing tool, not a posting bot. Every message ends up in your hands, drafted, reshaped, edited, and sent by you. Nothing posts on its own.

You review every draft before it leaves your keyboard.
Slacking only fills Slack's composer. The send action always stays yours.
Slacking only writes when you ask.
Autocomplete fires as you type; rewrites fire on click. Never automatically in the background.
Personal tone learning stays under your control.
Inspect what was learned, edit phrases, or clear the profile in a single setting.
Designed for professional communication.
No emoji injected, no exclamation inflation. Drafts match how you actually write at work.
What Slacking does
Autocompletes and drafts replies in the Slack composer
Generates editable drafts in your personal tone
Rewrites your own rough drafts in your voice
Keeps your learned tone profile private to your account
What Slacking will never do
Send a message on your behalf
Train shared models on your private messages
Auto-react, auto-acknowledge, or post on your behalf
Questions

The short answers.

Anything we missed? Ask the team →

No. The extension never sends. Every draft is inserted into Slack's composer in your browser and you hit send yourself. Slacking is an auto drafter, not an auto sender.
Slacking is live on the Chrome Web Store. Click Get Slacking, add it to Chrome, and you'll be drafting inside Slack in under a minute. It's free to start, no credit card.
Yes. You sign in with Google so your plan, draft count, and tone profile follow you across devices. There's no API key to set up; AI drafting runs on Slacking's hosted backend.
No. The copilot works right in the Slack tab you already have open, no connection required. Connecting Slack through OAuth is optional and only powers personal tone learning, so Slacking can study your own past messages. It's opt-in, and you can disconnect anytime from the popup.
Yes. Slacking runs a hosted backend on Supabase. When you ask for a draft or rewrite, the relevant Slack context is sent to that backend, which forwards the request to Anthropic's Claude and returns an editable draft. We never sell your data or train shared models on it. See the Privacy Policy for exactly what's sent and stored.
After you connect Slack and opt in, Slacking learns a private style profile from messages you've sent: length, openers, formality, recurring phrases. It's sanitized, stored in your account, visible to you, and you can clear it at any time. We never train shared models on it.

Quiet your Slack without quieting your team.

Basic is free forever. Pro starts with a 14-day free trial. Cancel anytime.

Download for Mac Get the Extension Try the demo