Business building · Do this yourself

Sell an all-in-one AI assistant app on mobile.

How it makes money: Charge app users $29/mo in-app for chat, image generation and quick answers in one app.

Agent setup: Advanced · A mobile app with store releases and in-app subscriptions. How we rate this

💰 Gronk makes about $11k a month doing this. $11,030 MRR, verified via RevenueCat on TrustMRR (synced 2026-10-16)

No X data

Based on Noman Haroon on TrustMRR (opens in new tab)

Who it’s for

Anyone who wants to start or grow a small online business, including people who can’t code.

Adapt it to your industry

  • Coach: an app or tool that helps clients between sessions
  • Shop: a tool that solves one annoying problem for your customers
  • Freelancer: package your best service into a self-serve product

Step by step

  1. Write down one problem a specific group of people pays to solve (for example “gym owners losing members”).
  2. Open ChatGPT, Claude or Grok and paste the prompt below to sharpen the idea and list what the first version must do.
  3. Build a simple first version with a no-code builder such as Lovable, Bolt or Bubble, or with Cursor if you code.
  4. Create a Stripe account and a Payment Link so people can pay from day one.
  5. Make a one-page website that explains the problem, the fix and the price.
  6. Show it to 10 people from your target group and change what confuses them.
  7. Launch where those people already gather, then ask every new user for feedback.

Ready-to-copy prompt

Write the App Store description and 5 screenshot captions for an all-in-one AI assistant app.

Start with AI

Opens the AI with this guide and the prompt filled in.

Open in ChatGPT (opens in new tab)Open in Claude (opens in new tab)Open in Grok (opens in new tab)
Time
2–6 weeks for a first versionOur estimate

Your autonomous stack

Autonomy: The app, onboarding, billing and support run without you. Your part: Weekly: read metrics and support escalations, approve changes (about 1 hour).

Every layer an agent-run business needs, in order. Prices are public list prices, checked Oct 16, 2026.

  1. Agent (the brain): Grok Bot (agent + scheduled routines) (opens in new tab) (Included with The X Subscription Premium $30/mo (Super $100/mo for more usage; Plus $8 does not include Grok Bot)). Grok Bot runs the business day to day: writes, answers, decides small things and reports to you. Claude Code or Codex are alternatives.
  2. Build and hosting: Lovable (opens in new tab) (Free tier · Pro $25/mo), Supabase database (opens in new tab) (Free tier · Pro from $25/mo). The product or service your customers use.
  3. Payments: Stripe payments (opens in new tab) (No monthly fee · 2.9% + 30¢ per card payment). Automatic checkout and receipts. Other options: PayPal Checkout (3.49% + 49¢) or Lemon Squeezy (5% + 50¢, handles sales tax).
  4. Customer acquisition: Buffer (scheduled X posts) (opens in new tab) (Free plan (3 channels, 10 queued posts each) · Essentials $5/mo per channel, billed yearly), beehiiv newsletter (opens in new tab) (Free up to 2,500 subscribers), Apollo (find business emails) (opens in new tab) (Free tier · Basic $65/mo). Agent-written SEO pages, scheduled X posts and a weekly newsletter, plus cold email to businesses that follow CAN-SPAM/GDPR (real sender, opt-out link, no bought consumer lists).
  5. Delivery: Grok Bot (agent + scheduled routines) (opens in new tab) (Included with The X Subscription Premium $30/mo (Super $100/mo for more usage; Plus $8 does not include Grok Bot)). A Grok Bot routine delivers the product or result as soon as someone pays.
  6. Support: Grok Bot (agent + scheduled routines) (opens in new tab) (Included with The X Subscription Premium $30/mo (Super $100/mo for more usage; Plus $8 does not include Grok Bot)). Grok Bot answers the support inbox; anything unclear is flagged for you.
  7. Monitoring and schedule: Grok Bot (agent + scheduled routines) (opens in new tab) (Included with The X Subscription Premium $30/mo (Super $100/mo for more usage; Plus $8 does not include Grok Bot)). Grok Bot scheduled routines run each day: send, check for failures, alert you if something breaks.
  8. Analytics: Google Analytics (opens in new tab) (Free). Tracks visits, signups and sales so the agent can report what works.
  9. Human checkpoint: Weekly: read metrics and support escalations, approve changes (about 1 hour).
  10. Price: charge $29 per customer per month (monthly subscription (saas)). Offer the first 3 customers a founding price for honest feedback.
Monthly cost$30–$150/monthFree tiers → paid plans of the tools above. Card fees come out of each sale.
What you could earn · EstimateEstimate: 10 customers × $29 = $290/moOur estimate, not a fact or a promise. It’s simple math if you land these customers at this price.
Details: source, numbers and tags

What they did

Gronk bundles chat, image generation and everyday answers into one iOS app with a subscription.

How it went

TrustMRR shows $11,030 MRR, verified via RevenueCat (last sync 2026-10-16).

Worth knowing

TrustMRR pulls this figure from the payment provider’s API; the product description is the founder’s own. Revenue can change month to month.

Difficulty
AdvancedOur rating
Time to build
Not reportedOur estimate
Monthly cost
Not reported
Revenue
$11,030 MRR, verified via RevenueCat on TrustMRR (synced 2026-10-16)Verified: Calculated by TrustMRR from payment-provider data (as the TrustMRR page states)
Engagement
No public countThe source shows no number
X buzz
No X data

Posted · Added Oct 16, 2026

Original builder recipe

  • LLM API
  • Image model API
  • iOS app
  • RevenueCat subscriptions
  1. Pick a narrow problem people already pay to solve.
  2. Build the first version with your agent.
  3. Charge early and talk to users.
  4. Use the agent to ship fixes fast.

Tags

Read the original

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