Free to start · No signup required · Practice in seconds
AI roleplay for
conversations that matter
Some talks change everything—your salary, your relationship, or the respect you get at work. cosskill is an AI roleplay 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.
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.
Breakup Message Coach
An AI coach for the message you are about to send: paste a draft or attach a screenshot of your text thread to rehearse a breakup text, a closure note, a reply to an ex, or a no-contact boundary.
AI Hiring Manager
A roleplay simulator for the raise conversation. You play yourself asking for more money; the AI plays a calm, slightly skeptical hiring manager whose budget is tight and whose patience runs out.
Defensive Direct Report
A roleplay simulator for the conversation managers avoid: telling someone good that their work has dropped. You play the manager; the AI plays a smart, defensive engineer who interrupts, goes quiet, or argues.
Angry Enterprise Customer
A roleplay simulator for the call after a major incident. You play customer success; the AI plays an enterprise customer whose production was down for four hours and who is already copying their CEO.
Guilt-Tripping Parent
A roleplay simulator for the conversation adult children rehearse in their head for years. You play yourself holding a boundary; the AI plays a loving parent who leans on sacrifice, old wounds, and "I know what is best for you."
Steve Jobs
An unofficial Steve Jobs AI that judges your product on taste, not feature count. It cuts first, asks what should not exist, and will not accept a pitch that takes ten minutes to explain.
Donald Trump
An unofficial Donald Trump AI that treats every conversation as a deal with leverage, concessions, and a winner. It opens extreme, holds the frame, and reframes retreat as a win.
Breakup Recovery Coach
An AI coach for the part after the breakup — when you want to text them at 2am, cannot stop replaying everything, or do not know what a normal week looks like anymore.
Socrates
An unofficial Socrates AI that answers your questions with better ones. It works on your definitions and examples until the disagreement you actually have becomes visible.
Love Letter Coach
An AI love letter writer that helps you craft something heartfelt that sounds like you — not a greeting card. It asks about your relationship, pulls out the specific details, and helps you replace generic phrases with your own language.
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.
Elon Musk
An unofficial Elon Musk AI that breaks your cost, your roadmap, and your requirements down to physics and raw materials — then asks why any of it exists.
Steve Jobs
An unofficial Steve Jobs AI that judges your product on taste, not feature count. It cuts first, asks what should not exist, and will not accept a pitch that takes ten minutes to explain.
Donald Trump
An unofficial Donald Trump AI that treats every conversation as a deal with leverage, concessions, and a winner. It opens extreme, holds the frame, and reframes retreat as a win.
Warren Buffett
An unofficial Warren Buffett AI that protects the downside before it looks at the upside. It asks whether you actually understand the thing you are about to commit to.
Breakup Message Coach
An AI coach for the message you are about to send: paste a draft or attach a screenshot of your text thread to rehearse a breakup text, a closure note, a reply to an ex, or a no-contact boundary.
AI Coworker
An AI coworker for the moment a Slack thread turns passive-aggressive and you need to write something direct without starting a war.
Socrates
An unofficial Socrates AI that answers your questions with better ones. It works on your definitions and examples until the disagreement you actually have becomes visible.
Marcus Aurelius
An unofficial Marcus Aurelius AI for steadying yourself before you answer. It separates what you control from what you do not, and rewrites the melodrama into something you can act on.
Confucius
An unofficial Confucius AI that treats communication as moral practice inside relationships. It works on roles, names, and reciprocity before it touches your wording.
Carl Rogers
An unofficial Carl Rogers AI that mirrors feelings and meanings instead of prescribing solutions, so you can hear your own clarity arrive.
Marshall Rosenberg
An unofficial Marshall Rosenberg AI that separates observation from evaluation, then routes the conflict through feelings, needs, and one concrete request.
Daniel Kahneman
An unofficial Daniel Kahneman AI that maps your decision onto fast intuition versus slow reasoning, names the bias in play, and asks whether the message would survive daylight.
Popular guides
Guides for the conversations people keep googling at midnight.
How to break up over text
When text is fine, what to actually say, and wording you can steal before you send.
BreakupBreakup text examples
Kind, blunt, or logistics-only messages for different situations.
NegotiationSalary negotiation guide
What to say when you ask for more, and how to stay steady when they push back.
PracticeBreakup Message Coach: try the text before you send it
Run the breakup message past something that pushes back instead of agreeing with everything.
How it works
Pick a persona
Operators, strategists, philosophers, psychologists — each one thinks differently. A Stoic won't respond like a first-principles operator. Choose the style that fits what you're facing.
Say what you'd actually say
Type the breakup text, the salary ask, the confrontation you've been avoiding. Don't overthink it. Just get it out.
See how it lands
The persona pushes back in character. You rewrite, try again, figure out your wording before the real conversation.
Frequently Asked Questions
Is this actually free?
Yes to start — you get 5 free messages per day without signing up, and 10 free messages per day after signing in (no credit card required). Pro is $12.90/month or $129/year for unlimited messages.
What can I practice here?
Breakup messages, salary asks, workplace confrontations, tough feedback, pitch rehearsals — plus you can attach screenshots of real text threads or emails to rehearse your reply.
Do I need an account?
No. You can chat without signing up (5 messages per day). Sign-in is optional — it gives you 10 free messages per day, lets you create private personas, and syncs history across devices.
Am I talking to a real person?
No. These are AI models set up to think and respond in specific ways. They're not real people, not endorsed by any public figure, and not a replacement for a therapist or lawyer.
How is this different from Character.AI?
Character.AI is entertainment roleplay with user-made characters. cosskill has 32 curated personas that think in specific ways — first-principles, NVC, Socratic questioning, and goal-oriented missions — without filters cutting off serious practice.