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Get ready for conversations
that matter

Some talks change everything—your salary, your relationship, or the respect you get at work. cosskill is an AI simulator where you rehearse these high-stakes moments before they happen. Pick a persona, say what you'd actually say, and practice until your words hold up.

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New · Mission Mode

Goal-oriented practice scenarios

Each scenario drops you into a specific scene with a goal. Live meters track how the other side reacts as you talk.

Mission

Breakup Message Coach

Helps you write the breakup text, closure message, or boundary statement — clear, kind, and final on the first try.

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Mission

Salary Negotiation Manager

Mission mode. You play yourself asking for a 15% raise. The AI plays a calm, slightly skeptical hiring manager whose budget is tight and whose patience is finite. Three live meters track the room.

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Mission

Defensive Direct Report

Mission mode. You play a manager delivering tough performance feedback. The AI plays a smart but defensive engineer who interrupts, deflects, and may get emotional. Meters track their stability, trust, and acceptance.

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Mission

Angry Enterprise Customer

Mission mode. You play customer success. The AI plays an enterprise customer whose production was down for 4 hours. They are loud, threatening to churn, and CC'ing their CEO. Meters: anger, trust, resolution.

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Mission

Overbearing Parent

Mission mode. You play an adult child holding a boundary your parent keeps trying to erode. The AI plays a loving but guilt-tripping parent who leans on sacrifice, old wounds, and "I know what is best for you" to bend you. Meters: guilt pressure, boundary firmness, family harmony.

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Mission

Jobs Persona

Judges everything in binaries: amazing or shit, nothing in between. Cuts 350 products to 10. If you can't describe your product in one sentence, the product has a problem.

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Mission

Trump Persona

Treats every interaction as a deal with leverage and concessions. Opens extreme, never apologizes, reframes every concession as a win. Thinks in zero-sum terms.

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Mission

Breakup Recovery Coach

For after the breakup — when you want to text them at 2am, can't stop replaying everything, or don't know what a normal day looks like anymore.

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Mission

Socrates Persona

Uses relentless question chains to expose hidden assumptions and contradictions. Offers warmth without letting sloppy reasoning slip past.

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Pick who you want to practice with

These aren't chatbots pretending to be real people. Each one thinks in a specific way and will push back differently.

Operator Personas

Musk Persona

Breaks every problem down to physics and raw materials. Asks why this step exists, who asked for it, and what happens if you delete it. Systematically overoptimistic on timelines.

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Operator Personas

Jobs Persona

Judges everything in binaries: amazing or shit, nothing in between. Cuts 350 products to 10. If you can't describe your product in one sentence, the product has a problem.

Chat with Jobs PersonaDetails
Strategy Personas

Trump Persona

Treats every interaction as a deal with leverage and concessions. Opens extreme, never apologizes, reframes every concession as a win. Thinks in zero-sum terms.

Chat with Trump PersonaDetails
Strategy Personas

Buffett Persona

Protects the downside before thinking about upside. Talks in baseball analogies and plain English. If you can't explain it in 5 minutes, you don't understand it well enough.

Chat with Buffett PersonaDetails
Relationship Personas

Breakup Message Coach

Helps you write the breakup text, closure message, or boundary statement — clear, kind, and final on the first try.

Chat with Breakup Message CoachDetails
Relationship Personas

Coworker Persona

For when the Slack thread is getting passive-aggressive and you need to write something direct without starting a war.

Chat with Coworker PersonaDetails
Philosophy Personas

Socrates Persona

Uses relentless question chains to expose hidden assumptions and contradictions. Offers warmth without letting sloppy reasoning slip past.

Chat with Socrates PersonaDetails
Philosophy Personas

Marcus Aurelius Persona

Separates what is yours to steer from what is mere weather. Reads disturbances through interpretations first — calm, duty-aware, quietly courageous.

Chat with Marcus Aurelius PersonaDetails
Philosophy Personas

Confucius Persona

Places ren, yi, and li at the center — character and right relationships before clever argument. Teaches through analogy and classical echoes aimed at harmony without cowardice.

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Psychology Personas

Rogers Persona

Leads with unconditional positive regard and reflective listening. Mirrors feelings and meanings instead of issuing prescriptions, so you hear your own clarity emerge.

Chat with Rogers PersonaDetails
Psychology Personas

Rosenberg Persona

Runs observations separate from evaluations, then routes conflict through feelings, universal human needs, and concrete doable requests — turning criticism into connection.

Chat with Rosenberg PersonaDetails
S1S2
Psychology Personas

Kahneman Persona

Maps decisions onto System 1 speed versus System 2 effort — naming biases (anchoring, availability, loss aversion) so messages and judgments survive statistical daylight.

Chat with Kahneman PersonaDetails

Popular guides

Guides for the conversations people keep googling at midnight.

Breakup

How to break up over text

When text is fine, what to actually say, and wording you can steal before you send.

Breakup

Breakup text examples

Kind, blunt, or logistics-only messages for different situations.

Negotiation

Salary negotiation guide

What to say when you ask for more, and how to stay steady when they push back.

Practice

Ex Persona: try the text before you send it

Run the breakup message past something that pushes back instead of agreeing with everything.

Browse all guides