Now accepting early members

The cofounder you can afford.

A personal AI system that runs your entire business — brand, content, email, ads, automations — so you can focus on what only you can do.

Start for $29/month See how it works

Cancel anytime. No contracts. No setup fees.

The Problem

You have a great idea. Launching it shouldn't take six months.

globe

Website

Spend a week on Wix or hire for $2000

edit_note

Content

10 hours/week or $500-2000/month

trending_up

Ads

Spend $1000 before one customer

mail

Email

Another learning curve, another bill

monitoring

Analytics

Jump between 5 dashboards

smart_toy

AI Tools

ChatGPT forgets you every time

bolt

Automation

Zapier/Make feel like learning to code

people

Isolation

Every decision alone with no data

The real problem isn't your idea. It's that you're trying to be a solopreneur, content creator, copywriter, ads manager, email marketer, and analyst all at once.

You need a cofounder. You can't afford one.

How It Works

From idea to customers. In days, not months.

1

Install in 5 minutes

Two paths: Ollama (free local AI) or Claude Pro. Both work out of the box.

2

Tell it your idea

Write a business brief. Second Founder learns your voice and asks the right questions.

3

It builds. You approve.

Brand identity, landing page, content ideas, email sequences, ad briefs, automations.

4

Your vault learns everything

Obsidian vault stores every decision, customer insight, metric. Connects dots you'd miss.

5

Scale from 1 idea to 10

Vault suggests new products, content angles, revenue streams. If 1 of 10 succeeds, you win.

What You Get

Everything a cofounder does. One subscription.

5 AI Agents

  • + Content creation and social media
  • + Ad copywriting and campaign strategy
  • + Email sequences and nurture flows
  • + Automation workflows and integrations
  • + Analytics and reporting

Obsidian Vault

Personal knowledge base with pre-built sections for your business bible, brand identity, and market intelligence.

19 Automations

Content posting, email triggers, ad monitoring, analytics compilation, and more — all running 24/7.

The Idea Engine

After 2 weeks, your vault surfaces new ideas. Test multiple products in parallel. Scale what works. Vault learns patterns others miss.

Direct Support

Stuck? Email the founder directly. Real answers from someone who uses this system every day.

Monthly Updates

New agents, new automations, new vault templates. The system gets better every month. You get every update automatically.

The Idea Engine

AI that remembers you. And gets smarter every day.

vault/
MEMORY.md
-- your business bible

PROFILE.md
-- brand identity

knowledge/
  audience.md
-- customer psychology
  competitors.md
-- market intel
  rules.md
-- confirmed patterns
  hypotheses.md
-- ideas to test

decisions/
raw/
-- new data lands here
Week 1

Vault learns your brand, market, voice

Week 3

Spots patterns, suggests content angles

Month 2

Connects dots across ads/emails/feedback, surfaces product ideas

Month 3+

Tested 10 ideas, knows which got traction, suggests how to scale

Two Paths

Pick your AI engine. Everything else is the same.

Local (Ollama)

$0 for AI + $29/mo

  • + Runs locally, full privacy
  • + Works offline
  • + Needs 16GB RAM, 15GB disk
  • — Response: 5-10 seconds
Recommended

Cloud (Claude Pro)

$20/mo Claude + $29/mo = $49/mo

  • + Smartest AI available
  • + Instant responses
  • + Works on any device
  • + Recommended for rapid scaling
Pricing

Less than a freelancer's hourly rate. Works 24/7.

Monthly

$29/mo

Get Started

Cancel anytime, full access, all features

Everything included:

  • + Full agent system
  • + Obsidian vault template
  • + 19 automations
  • + Idea Engine
  • + Direct founder support
  • + Monthly product updates
Save 29%

Yearly

$249/yr

($20.75/mo, save $99)

Lock In Yearly

Everything in Monthly plus:

  • + Lock-in price, never increase
  • + First month prorated
  • + Priority feature requests
  • + Early access to new agents

No refunds. Full year access.

Our recommendation: Start monthly. Test it for 30 days. If it works, lock in the yearly rate.

How We Compare

They build you a website. We build you a business.

vs. AI Website Builders

A website isn't a business. You need systems running behind it.

vs. ChatGPT / Raw AI

Raw AI doesn't know you. Forgets everything. Reinvents the wheel every conversation.

vs. Zapier / Make

Blank slates take weeks to set up. We come pre-built for your entire business.

vs. Hiring a Cofounder

$29/mo vs. $3000/mo + equity. One scales infinitely. One doesn't.

FAQ

Common questions.

What is Second Founder, exactly? expand_more
AI operating system for solo businesses. 5 agents, Obsidian vault, 19 automations, learns your business, remembers everything, gets smarter every month. Not a website builder. Not a chatbot. A system.
Do I need to be technical? expand_more
No. Open an app, click approve/reject. AI does work, you decide. All technical setup handled for you. If you can use email, you can use Second Founder.
How much does AI cost? expand_more
Ollama: $0 + $29/mo. Claude Pro: $20/mo + $29/mo = $49/mo. Flat rate, no per-usage charges. You know the cost upfront. Pick your AI engine.
What businesses does this work for? expand_more
Online courses, digital products, coaching, consulting, freelancing, content creators, info products, music production, services, SaaS, apps. Anything you can build and sell online. Anything with a vault of customer insights that compounds over time.
How is this different from ChatGPT? expand_more
ChatGPT forgets you every time. Second Founder remembers everything and learns patterns. Your vault becomes smarter. Suggestions get better. You'd never show ChatGPT your customer data. You'd keep your money in Second Founder.
Can I cancel anytime? expand_more
Monthly yes, no questions. Yearly no refunds but full year access. Start monthly first. Test it. Upgrade to yearly when you're confident.
What is Obsidian? expand_more
Free note-taking app, runs locally on your computer. We use it as the vault. Template provided. Learn in 10 minutes. No code, no complexity. Just markdown files your AI reads and writes.
What if I have multiple business ideas? expand_more
Built for that. Separate projects, test in parallel, find the winner. Vault learns what works across all of them. Scale the winners. Kill the losers fast.
Who Built This

Built by a solo founder. For solo founders.

Sungwoo

@heysungwoo

6.5M+ TikTok views

3M+ YouTube views

3x KCON performer

Produced for pH-1

Music producer and entrepreneur. Built AI agent system to run own business — a beat-making course doing six figures. 5 agents, 19 automations, Obsidian vault.

People kept asking how he does it alone. So he productized it. Not just for musicians — for anyone building alone. Every feature exists because he actually uses it.

Your idea deserves a cofounder.

Start building today. Ship your first product this month.

Start for $29/month See pricing

Start monthly. Cancel anytime. Upgrade when you're ready.