For founders
Sharpen the founder story before the room does
Investors, advisors, and YC interviewers all ask hard, fast questions. The founders who do well have already fought through those questions with each other. Harmonica gives you a structured way to do that, and to surface the clearest version of your narrative before it lands in front of the people who matter.
The founder-prep gap. And what closes it.
Hard to articulate the vision clearly
You've been living inside this idea for months. That makes it harder, not easier, to explain it simply. The words that feel obvious to you land as jargon to someone hearing your pitch for the first time. You need an outside mirror.
Surface your strongest arguments
Harmonica facilitates a structured conversation around your core thesis: problem, solution, market, insight, unfair advantage. The AI follows up where your answers are thin. What comes back is a synthesis of your clearest thinking, ready to shape into pitch copy, deck slides, or application essays.
Co-founder misalignment you haven't named yet
Two founders can believe in the same company and have fundamentally different assumptions about what problem they're solving, who they're solving it for, and why they'll win. That misalignment shows up in the meeting (or worse, after funding).
Align your co-founders on the answers that matter
Run a session with both co-founders answering independently. On Pro, cross-pollination shows you where your answers converge and where they diverge, before that divergence shows up as uncertainty in a 10-minute meeting.
Assumptions you haven't pressure-tested
Every pitch has weak spots. The ones that don't get caught in your own prep get caught by the people across the table. "Why haven't Google/Stripe/Salesforce already done this?" is easier to answer when you've thought it through before the call.
Pressure-test your assumptions systematically
Use a structured template that walks through the hard questions investors, partners, and YC are known for asking. Not to coach you on the "right" answer: to help you find yours before the room forces you to improvise.
Ready to get started?
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Why Harmonica works for founder prep
Multiplayer mode for founders
Build your narrative together in real-time or asynchronously. No more passing Google Docs back and forth or losing track of versions.
- Real-time collaborative editing
- Progress tracking across team members
- AI assistance that builds on everyone's inputs
- Comment and feedback system
Built on founder success patterns
Templates that incorporate patterns from YC applications, investor pitches, and board presentations that landed. See what works, what doesn't, and why.
- Section-by-section guidance from founders who've been there
- Red flag detection and suggestions
- Examples of successful responses
- "Why this works" context for each section
Your AI co-founder coach
An AI that helps refine your narrative through conversation, not forms. It asks the hard questions investors and YC partners would.
- Probing questions that uncover your unique insights
- Clarity and concision improvements
- Feedback on market size and growth potential
- Technical breakthrough validation
Also built into the workflow
Async-first. You and your co-founder answer the same questions independently, at your own pace. Then compare. The differences are the prep work.
Cross-pollination shows alignment gaps (Pro). After each founder completes their conversation, Harmonica synthesizes themes and tensions across both. You see exactly where you're aligned and where you're not.
Results you can actually use. Session output includes a structured summary and direct quotes from your own conversations — raw material for your application, your deck, your talking points.
Repeatable. Run it again after you revise your thinking. Each iteration produces a new synthesis — useful for tracking how your narrative evolves through the prep process.
Invite advisors too. Add a trusted advisor or domain expert to your session. Their independent answers feed into the synthesis alongside yours — useful for getting an outside view of your assumptions.
Free tier available. No subscription required to run your first session. You don't need to be a paying user to use Harmonica for your prep.
How it works
Getting started is easy.
Share your objective and give us context about your team. We'll design the right questions to get you the insights you need.
Share the link with your team and analyze responses in real-time. You'll see themes and patterns emerge as people contribute.
Transform input into actionable insights. Get the clarity you need to make decisions and move your team forward.
Run a founder alignment session today
Takes about 20 minutes per founder. The synthesis is ready immediately after. Useful whether your next pitch is in two weeks or two months.