A reasoning studio · Est. 2025
EVERY ARGUMENT
HAS TWO STRONG SIDES.
Bring a decision you're torn on, or a belief you hold. MindSpar builds the strongest case for and against it, hands you a balanced verdict — then steps into the ring and spars with you.
THE RING
THE BOUT
THE VERDICT
FOR
AGAINST
What would change this
The blind spot
Think the verdict's wrong? Pick a side and spar. You argue your corner — MindSpar argues the other, hard but fair.
THE METHOD
Three moves, every time.
01
Name it
State the decision, belief, or either/or you're wrestling with. One sentence is enough.
02
See it steelmanned
We argue both sides at their strongest — not strawmen — then adjudicate where the weight of reason sits and why.
03
Spar it
Disagree? Pick a corner and go rounds against a sharp opponent that probes your weak spots and concedes your strong ones.
WHY IT MATTERS
Most of us only ever hear our own side — louder.
Feeds reward agreement. Search returns what we already believe. The muscle that actually makes us smarter — holding the best version of the opposing view in our head — quietly wastes away. MindSpar is a gym for that muscle. It refuses to take your side. It builds the strongest case against you, fairly, so your conclusions are earned instead of inherited. Better decisions, fewer blind spots, and the rare confidence that comes from having genuinely heard the other corner.
BRING IT
What people put in the ring.
Life decisions
Quit or stay, move or root, buy or rent — get both cases before you commit.
Beliefs & takes
Pressure-test an opinion you hold strongly and find out if it survives contact.
Debate prep
Practise against the strongest opposing arguments before the real room.
Writing & essays
Surface counter-arguments so your piece anticipates them instead of dodging.
Studying
Learn any contested topic by seeing it argued from both directions.
Hard conversations
Understand the other person's best case before you walk into the room.
EDITIONS
Start free. Train harder when you're ready.
Open
$0
For everyone, forever.
- Both-sides cases + verdict
- Live sparring rounds
- No account required
Most popular
Member
$6/mo
For the daily thinker.
- Saved bouts & history
- Longer, deeper cases
- Unlimited sparring
- Export to share
THE STUDIO
A small studio for clearer thinking.
MindSpar is an independent reasoning studio. We build one thing well: tools that make it effortless to hear the strongest version of the other side. We started in 2025 with a stubborn belief — that the scarcest skill of the AI era won't be finding answers, it'll be judging them. Everything we ship is in service of that.
June Ritchie
Founder · MindSpar · Founded December 16, 2025
QUESTIONS
Straight answers.
Will it just tell me what I want to hear?
No — that's the whole point. MindSpar argues the strongest case against you on purpose, then adjudicates honestly. Sometimes the verdict is "it depends," and it'll say so.
Is it free?
Yes. The core experience — both-sides cases, the verdict, and live sparring — is free and needs no account.
Does it work for any topic?
Best for genuine decisions, contested beliefs, and either/or questions. It's a reasoning partner, not a source of facts — for high-stakes legal, medical, or financial calls, treat it as a thinking aid, not advice.
Do you store what I type?
Your bouts aren't tied to an identity on the free tier. We only store an email if you choose to subscribe. See our privacy policy.
Get the sharper version.
One email when Member and Studio open up. No noise.