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Best AI Cofounders

Run by the team behind Crevio, which we rank first. Every tool, Crevio included, is scored on the same published rubric. Read our disclosure.

The best AI cofounders for running several businesses

For serial founders, portfolio builders and agencies.

Updated November 11, 2026

If you test many ideas or run several small brands, you need separate sites, customers and books for each, without paying full price for every one.

We include tools whose plans cover more than one business.

6 picks, ranked

  • Ideathe strategist
  • Buildthe builder
  • Sellthe seller
  • Runthe operator
  1. 1
    CrevioFull AI cofounder
    9.1
  2. 2
    CofounderFull AI cofounder
    7.7
  3. 3
    MadeThisFull AI cofounder
    7.6
  4. 4
    PolsiaFull AI cofounder
    7.3
  5. 5
    NanoCorpFull AI cofounder
    6.6
  6. 6
    MarblismAI employee
    6.3

Ordered by overall score on our rubric.

No. 1

Crevio

Full AI cofounder, from $25/mo

Solo founders who want one AI cofounder for the whole business, not a stack of tools

The only tool we reviewed that fills all four founder seats on its own and keeps working after launch. It researches the idea, builds the site and app, sells through checkout, email, social, ads and phone, and runs standing tasks on a schedule or when something happens, like a new order or a failed payment. Payments land in your own Stripe account, and anything risky can wait for your approval.

Why it earns a seat

  • Covers idea, build, sell and run in one agent, so nothing falls between tools
  • Standing tasks run on a schedule or a trigger, like a new order, an inbound email or a missed call
  • Payments settle into your own Stripe account; Crevio is not the merchant of record
  • Every feature on every paid plan: custom domains, team, API, MCP, ads, phone

Where it falls short

  • Credit-based billing: a busy month uses more credits, so the bill isn't a flat number
  • 2.5% fee on your sales on paid plans, 5% on the free plan, on top of card processing
  • The free plan is 100 credits given once, not a monthly allowance
  • A newer company with a much smaller review footprint than Lovable, Replit or LivePlan
No. 2

Cofounder

Full AI cofounder, from $40/mo

Technical founders who already pay for an AI coding agent and want departments run around it

The closest rival to a full AI cofounder. The department model is well thought through and the per-company price is simple. The catch is that you also need your own AI coding agent subscription, such as Claude Code or Codex, and the $40 includes only $40 of usage.

Why it earns a seat

  • Clear department structure with shared company context
  • LLC incorporation with approval gates on risky actions
  • Simple per-company price, with usage credits that roll over
  • MCP, custom APIs and custom skills for extending it

Where it falls short

  • Requires a separate AI coding agent subscription on top of the $40
  • $40 of included usage can go quickly on an active company
  • Older third-party pages quote different prices and a trial, so check before you buy
  • Built for people comfortable directing coding agents
No. 3

MadeThis

Full AI cofounder, from $49/mo

Founders who want an AI to build and run a simple online business on autopilot

A serious full-cofounder product with fast growth and a good approval model. It ranks below Crevio on coverage (no phone or company formation that we could confirm) and on trust: there are no refunds, and assisted export only opens after three paid months.

Why it earns a seat

  • Builds, launches and operates, not just builds
  • Propose mode for one-tap approvals, Autopilot for hands-off
  • Sets up Stripe payments and runs Meta ad campaigns
  • Plans by number of businesses, up to 10

Where it falls short

  • No refunds
  • Assisted export only after 3 paid months
  • Custom domain starts on the $79 plan
  • No phone answering or company formation that we could confirm
No. 4

Polsia

Full AI cofounder, from $20/mo

Experimenters who want to launch several small companies and let them run overnight

Polsia made the autonomous-company idea famous and does run tasks every night without prompting. It loses ground on cost and trust: its cut of payments and of ad budgets adds up fast once you have revenue, it doesn't do refunds, and reviewers often mention credits spent on fixes.

Why it earns a seat

  • Genuinely autonomous: works on your company every night
  • Cheap to start a single company
  • Website, database and business email included
  • Handles outreach and ads, not just the build

Where it falls short

  • Takes a share of your payments and ad spend on top of the plan
  • No refunds
  • Reviewers report credits used up on corrections
  • Pricing has changed several times, so older reviews quote other numbers
No. 5

NanoCorp

Full AI cofounder, from $30/mo

Heavy Claude or ChatGPT users who want a side business run from their chat

A clever way to run a company from the AI chat you already use, with real scheduled work. The 20% fee on withdrawals makes it costly once revenue arrives, and it does less on the website and support side than the leaders.

Why it earns a seat

  • Runs from Claude, ChatGPT or any MCP client
  • Scheduled agent work with budget caps per task
  • Unlimited businesses and custom domains
  • Credits roll over

Where it falls short

  • 20% fee when you withdraw revenue
  • Revenue sits with the platform until you withdraw it
  • No refunds, and higher credit tiers have no published price
No. 6

Marblism

AI employee, from $24/mo

Existing small businesses that want marketing and admin help at a flat price

Very good value for an existing small business that wants help with marketing and the inbox. It isn't a cofounder in the build-the-business sense: it doesn't create your site, product or checkout.

Why it earns a seat

  • One flat price for seven AI employees
  • Unlimited businesses and team members
  • Chat and quick tasks don't use the hour cap
  • Phone reception included

Where it falls short

  • Doesn't build your product, site or checkout
  • 50-hour monthly cap, with paid top-ups
  • No free plan

Side by side

Capabilities: The best AI cofounders for running several businesses
ToolResearchPlanWebsiteAppPaymentsMarketingAdsSupportLLCAutopilot
Crevio
Cofounder
MadeThis
Polsia
NanoCorp
Marblism

Does it itself Partly, or through an integration you set up Not offered, or not something we could confirm

Questions founders ask

Which AI cofounder is best for several businesses?

Crevio's Growth and Scale plans cover 3 or 10 businesses on one bill with a shared credit pool. MadeThis and Polsia also price by number of businesses; Marblism and NanoCorp allow unlimited businesses.