Content creation · Do this yourself

Launch tiny single-question tool sites that earn from ads.

How it makes money: Earn display-ad revenue from tiny single-question tool sites, or sell each grown site for about $150.

Agent setup: Intermediate · Connects several tools (Vercel) with payments and simple data. How we rate this

Found on Reddit in r/passive_income (1 thread).

🔥 6 posts this week · 10 likes

Based on u/Impressive-Sea2186 on Reddit (opens in new tab)

Where this came from (Reddit)

People search simple daily questions that no site answers well.

The threads (in our words)

Reddit blocks automated reads, so we couldn’t record upvote or comment counts. The business below is our own design inspired by these threads.

Who it’s for

Builders who like quick experiments and SEO.

Adapt it to your industry

  • Start with one niche or customer type, then expand.
  • Ask your first 10 customers what they would pay before you build more.
  • Keep a human check on anything sent in a customer’s name.

Step by step

  1. List everyday questions people search (weather, dates, conversions).
  2. Build each tool with AI in an evening, using free public data APIs.
  3. Add a privacy-friendly ad network once traffic comes.
  4. Share each tool where it genuinely helps.
  5. Have an agent watch traffic and fix broken data feeds.
  6. Keep the winners; shut down the rest.

Ready-to-copy prompt

Suggest 20 single-purpose web tools that answer an everyday question with free public data, with example searches and the data source for each.

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
1–3 hoursOur estimate

Your autonomous stack

Autonomy: Agents write, produce and publish on a schedule. Your part: Weekly: approve the next batch before it posts (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: Vercel hosting (opens in new tab) (Hobby free · Pro $20/mo), Google Analytics (opens in new tab) (Free). 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). Agent-written SEO pages, scheduled X posts and a weekly newsletter.
  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: approve the next batch before it posts (about 1 hour).
  10. Price: charge $150 per site (display ads and affiliates). Offer the first 3 customers a founding price for honest feedback.
Monthly cost$30–$55/monthFree tiers → paid plans of the tools above. Card fees come out of each sale.
What you could earn · EstimateEstimate: 3 tool sites × $150 = $450/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

Build one-purpose web tools (like “can I dry clothes outside today?”) with AI and earn from ads. We designed this business from real Reddit threads; it is an idea for you to build, not a description of the posters’ businesses.

How it went

Found on Reddit in r/passive_income (1 thread). Upvote and comment counts weren’t retrievable, so none are shown. On X, 6 posts matched our search for this idea in the 7 days to 2026-10-16.

Worth knowing

Respect data APIs’ terms and keep ads light.

Difficulty
BeginnerOur rating
Time to build
Not reportedOur estimate
Monthly cost
Not reported
Revenue
Not reportedWe only show revenue the source states
Engagement
No public countThe source shows no number
X buzz
15.2 · 6 posts in 7 days10 likes, 0 reposts, 10 replies, 0 quotes on 1 top posts · fetched Oct 16, 2026 · query: ("built a website" OR "made a website" OR "built a tool") (visits OR visitors OR traffic) (ai OR gemini OR chatgpt) -is:retweet lang:en

Posted · Added Oct 16, 2026

Original builder recipe

  • ChatGPT
  • Claude
  1. List everyday questions people search (weather, dates, conversions).
  2. Build each tool with AI in an evening, using free public data APIs.
  3. Add a privacy-friendly ad network once traffic comes.
  4. Share each tool where it genuinely helps.
  5. Have an agent watch traffic and fix broken data feeds.
  6. Keep the winners; shut down the rest.

Tags

Read the original

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