Hey Product Hunt! 👋

I'm Bob, founder of Spar. I built this because I've been a solo founder for years and the hardest part isn't the work — it's having no one to think with.

I tried using ChatGPT and Claude for business strategy, but every conversation started from zero. I'd explain my business again. And again. And they'd always agree with me, which is the opposite of what a co-founder should do.

So I built Spar to solve three problems:

Memory — it remembers everything across sessions. Your revenue, your team, your fears, your goals.

Challenge — it pushes back on weak reasoning instead of validating it.

Contradictions — it flags when your actions conflict with your stated priorities.

Tone Adaptation — 5 co-founder archetypes (Tough Love, Strategic, Analytical, Supportive, Visionary) with a slider

Document Analysis — Upload PDFs and images, AI extracts and reasons over them as business context

Searchable History — Hybrid search (semantic + keyword) across all past sessions and facts

Proactive Check-ins — Scheduled emails that follow up on goals and decisions

Session Summaries — Auto-generated summaries when sessions end, archived for long-term reference

Onboarding Intelligence — Guided first conversation that builds your business profile from scratch

Feedback Signals — Thumbs up/down on responses to continuously improve quality

Goal & Decision Tracking — Extracted and stored separately so they can be referenced and followed up on

We're offering a 60-day free trial — no credit card needed. I wanted enough time for Spar to actually build memory and prove its value.

Would love your honest feedback. What would make you trust an AI co-founder?