Spar — Train your thinking with AI - Most AI agrees with you. Spar argues back.

Most AI is trained to agree with you. Spar is the opposite — an adversarial debate partner that pushes back, questions your sources, and finds the holes in your thinking. Pick from 6 archetypes (Cross-Examiner, Socratic, Journalist, Executive, Ideologue, Friendly Saboteur), argue any topic across 5 rounds, and get a coaching report on where your thinking held and where it broke. For debaters, writers, founders, and anyone who needs to defend their thinking. Built to make you sharper, not happier

Hey Product Hunt 👋 I'm Lamar — a healthcare analyst by day, indie builder by weekend. Spar started because I was using ChatGPT and Claude every day and noticed they kept telling me my ideas were great. They weren't. I wanted a tool that did the opposite — argued with me, found the holes, and made me actually defend my thinking. So I built Spar. You pick from 6 AI archetypes, each with their own tactics (the Cross-Examiner picks apart your sources, the Socratic asks the question behind the question, the Friendly Saboteur agrees with you in ways that make your argument worse). You argue across 5 rounds, then get a coaching report on what held and what didn't. Genuinely curious what you think — especially what archetype you find hardest to argue against. I'll be around all day answering questions. — Lamar

Spar — Train your thinking with AI - Most AI agrees with you. Spar argues back.

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