Most of us prepare for big conversations by... not preparing. We rehearse a few lines in our heads, maybe mutter them in the shower, then walk into the meeting and freeze.
I built cosskill to fix that. It's an AI communication simulator: you rehearse high-stakes conversations — salary negotiations, performance feedback, difficult personal talks — by actually talking with realistic AI personas before they happen.
What practicing looks like
- Pick a scenario: asking for a raise, delivering hard feedback, saying no to your boss, or an entirely personal one.
- The AI plays the other person. It pushes back, changes tone, and asks the questions you're afraid of.
- You talk it through, out loud, then look back at what worked and where you got stuck.
Three things I learned building and using it
Rehearsal beats research. Reading ten articles about negotiating doesn't help much when the other person says "we'll see." Practicing your counter-move does. A simulator gives you the counter-move.
The second attempt is where the skill is. The first run through a scenario is rough. By the third replay the rhythm changes — you stop defending and start steering. That's the whole point of practice.
Saying it out loud matters. Typing an argument is easy. Speaking it to an AI boss that interrupts and pushes back is a different skill — and the one you actually need in the room.
Try it
cosskill is free to try: a few messages without an account, more after sign-in, all personas and scenarios included. Unlimited use is on Pro.
If you have a hard conversation coming up, rehearse it first at cosskill.com. Two of our guides go deeper: how to ask for a raise and how to give negative feedback.
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