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CofounderOS
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Everything solo founders wish a cofounder helped with.

CofounderOS gives you startup memory, strategic pushback, execution structure, and weekly accountability — so you can make better decisions and keep building with clarity.

Create your Startup BrainSee pricing

The CofounderOS operating loop

Five surfaces. One closed loop.

Memory grounds decisions. Decisions shape execution. Execution becomes review. Review becomes the next update — then the loop starts again, smarter.

Startup Brain

Living memory

Captures your product, customer, problem, decisions, and risks so context is always one search away.

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Decision Room

Pressure-tested calls

Pushes back on weak reasoning, surfaces assumptions, and recommends a next action you can defend.

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Execution Roadmap

Now / Next / Later

Five honest lanes — including Validate-First and Kill — that force the tradeoffs solo founders avoid.

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Weekly Founder Review

The Friday ritual

Six prompts that turn another busy week into a clear record of what shipped and what's next.

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Investor Updates

Drafted for you

Assembles draft updates from your shipped work, decisions, and learnings. You edit, you send.

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Startup Brain

A living memory of your company

Your startup's full context — captured once, retrievable forever. CofounderOS stops you from re-explaining the same thing every time you open a new chat.

  • Remembers the product — what it is and how it works.
  • Remembers the customer — ICP, segments, jobs-to-be-done.
  • Remembers the problem — and which version you're solving today.
  • Remembers the roadmap — bets, sequencing, and tradeoffs.
  • Remembers user feedback — pulled from interviews and notes.
  • Remembers past decisions — so you can audit your own thinking.
  • Cuts the cost of context-setting to near zero.
Startup BrainEight context sections

Build it once. Query it forever.

Capture each section in plain language. CofounderOS uses every piece to ground recommendations across the rest of the loop.

Build your Startup Brain
Decision Room

An AI cofounder that argues back

CofounderOS is built to challenge — not flatter. Bring in any decision and walk away with a structured analysis you can defend to yourself, your team, or your investors.

  • Surfaces hidden assumptions before they cost you a quarter.
  • Weighs evidence against your stated goal — not vibes.
  • Lays out options with explicit tradeoffs.
  • Recommends a next action with reasoning, not platitudes.
  • Logs the decision so you can audit your judgment over time.
Example outputPressure-tested decision
Execution & Next Best Move

Not another task app — a founder focus engine

CofounderOS doesn't just hold a list. It helps you decide what's actually worth doing right now, given your goal, your capacity, and what you've already shipped.

  • Five honest lanes: Now, Next, Later, Validate-First, Kill.
  • Validate-First forces evidence before building.
  • Kill keeps dead ideas dead — with the reason logged.
  • Next Best Move ranks what to pick up the moment you have an hour.
Next Best MovePrioritization signals
Weekly Founder Review

The accountability habit solo founders never run alone

A weekly check-in that takes ten minutes and compounds for years. Six prompts, structured the same way every Friday, captured forever.

  • What did you ship?
  • What moved the business?
  • What distracted you?
  • What did you learn?
  • What should be killed?
  • What is next week's top priority?

Weekly summary

A clean recap built from your answers.

Next week focus

One priority — surfaced everywhere.

Warning signs

Risks logged before they become fires.

Accountability note

Your own voice, on the record.

Founder Updates & Communication

Useful before you ever take outside money

Most founders should be writing structured updates long before they have investors. CofounderOS drafts them from your real activity — for advisors, accelerators, mentors, your own records, and future fundraising.

  • Advisor updates that turn casual help into structured input.
  • Accelerator check-ins built straight from weekly reviews.
  • Mentor summaries that respect everyone's time.
  • Monthly founder notes — even if the only reader is you.
  • A clean fundraising paper trail when you're ready.

CofounderOS drafts inside the app and exports clean Markdown. You copy, edit, and send through your own mailer.

CofounderOS doesn't invent metrics, draft assistance, or customer voices. What you see is built from your real workspace data.

Cofounder Cockpit

Stop rebuilding your startup context from scratch.

Bring your real product, customer, and decisions in once. Let CofounderOS hold the loop running — every week, on rails.

Start with your Startup BrainSee pricing