Find the co-founder
you'd build with for ten years.
The founder network for Central & Eastern Europe. cofound.si uses AI to match co-founders, validate ideas, and prep your raise — across the whole region, not just your city.
Our mission
Build the startup engine of Central & Eastern Europe.
Talent across CEE is world-class but scattered — cofound.si connects founders from Ljubljana to Warsaw, Tallinn to Sofia. One platform to find a co-founder, validate your idea, prepare your pitch, and launch — so no one has to face investors and the startup world alone.
Find a co-founder
AI-matched, weighted on what matters to you.
Validate your idea
Honest feedback from real users in the Feedback Pool.
Prepare your pitch
Tools, templates and AI coaching before you face investors.
Launch
Waitlist, board and toolkit — go from idea to live product.
The platform
A real co-founder OS, not another swipe app.
Weighted AI matching
Tune sliders for what matters to you — technical depth, sales chops, time commitment, equity split, location. Our AI re-ranks candidates with full reasoning, not a black box.
Verified founder network
Curated, not crawled. Every profile is reviewed for signal.
Stage-aware
Match by idea, MVP, revenue, or scaling — never the wrong stage.
Founder toolkit
Cap table calc, equity split, pitch deck templates, legal primers.
AI search
Type "ML engineer who's shipped a B2B SaaS in Berlin" and find them.
How it works
From profile to first coffee in 4 steps.
Build your founder profile
Skills, stage, industries, commitment, equity expectations, what you're looking for.
Set your weights
Tell the AI what matters — depth in tech, business chops, location overlap, chemistry.
Get scored matches
Every match comes with a transparent compatibility breakdown and AI reasoning.
Start the conversation
Reach out directly. No swiping, no algorithms gatekeeping introductions.
Toolkit
Founder toolkit
Calculators, planners and battle-tested templates — everything you need from idea to first round.
Equity split calculator
Slicing Pie / FAST weighted split across founders.
Runway calculator
Months of runway from cash, burn and revenue.
18-month financial planner
Project MRR, costs, profit and cash month by month.
Pitch deck templates
Sequoia and YC seed / Series A deck structures.
Legal templates
Co-founder agreements, SAFEs, mutual NDAs.
Curated resources
YC Startup School, First Round, Stripe Atlas, more.
Pricing
Start free. Upgrade when you're ready to raise.
Whether you're validating an idea or reviewing pitches for a living, there's a plan that fits.
Starter
Everything to find a co-founder and validate your idea.
- AI co-founder matching
- Founder profile + verified badge
- Post pitches to the Feedback Pool
- 3 reviews per month
- Core founder toolkit
Prices in EUR. Cancel anytime. VAT may apply.