Slack Ghost Autocomplete: Finish Replies as You Type
Ghost autocomplete predicts the rest of your Slack reply so you finish with one key. What it is and why it's the feature people use most.
You know the feeling: you start typing a Slack reply, you know exactly how it ends, and you type it out anyway for the hundredth time. Ghost autocomplete fixes that. It's the same idea as the gray suggested text in Gmail or a code editor, brought to your Slack composer — it predicts the rest of your sentence, and you accept it with one key.
Here's what ghost autocomplete for Slack is, how it differs from a full draft, and why it ends up being the feature people use most.
What ghost autocomplete is
As you type a reply, a faint "ghost" suffix appears ahead of your cursor — a prediction of what you're about to write, based on the visible thread and what you've typed so far. Press Tab to accept it. Keep typing to ignore it. It never blocks you and never commits anything; it's a suggestion you can take or leave on every keystroke.
In Slacking, the ghost suffix is drawn from the actual conversation in the channel, so the prediction fits the thread instead of guessing in a vacuum.
How it's different from a generated draft
A Slack auto drafter writes a whole reply when your box is empty. Ghost autocomplete is for when you've already started and just want to finish faster. They solve different moments:
- Blank box, no idea where to start? Generate a first draft from the thread.
- Know the gist, halfway through a sentence? Let autocomplete finish it.
Most short replies fall into the second bucket, which is why autocomplete quietly becomes the thing you reach for all day.
Why people end up using it the most
Full drafts are great, but they're a deliberate action — you ask for one, you read it, you decide. Autocomplete is ambient. It rides along while you type and only helps when its guess is right. There's no mode switch and no waiting. The result is that a two-line reply you'd normally tap out in twenty seconds happens in five, and it doesn't break your train of thought.
The best autocomplete is the kind you forget is there until it saves you a sentence.
Staying in control
A few things keep it from getting in the way:
- Tab to accept, type to dismiss. You never have to fight a wrong suggestion — just keep typing over it.
- It only fires while you type. No popups, no interruptions when you're reading.
- It drafts, it doesn't send. Accepting a suggestion fills your composer. You still press send.
That last point is the same principle behind everything Slacking does: the tool speeds up the writing, you keep the decision.
Frequently asked questions
What is ghost autocomplete in Slack?
A faint, inline prediction of the rest of your sentence that appears as you type a Slack reply. You accept it with Tab or keep typing to ignore it. Slack doesn't have this built in; Slacking adds it as a Chrome extension.
Is Slack autocomplete the same as a draft?
No. Autocomplete finishes a sentence you've started. A draft writes a full reply from a blank box. Slacking does both, for the two different moments.
Does accepting a suggestion send the message?
No. It only fills Slack's composer. You read and press send yourself.
How do I get it?
Ghost autocomplete ships in the Slacking Chrome extension, currently in private beta. Join the beta list to get an install link.