How to build a one-page SaaS that generates $2.1K/mo in one weekend

A single page, one input, one output. $19/mo. Profitable on day 14.

$2.1K MRR

Built in 4 months

@solo_dev

⚡

📊 TL;DR

1.Single-page SaaS: paste a competitor URL → get a Claude-generated SEO content brief.
2.Built in one weekend. Launched on Product Hunt + Reddit. First paying user on day 3.
3.$2.1K MRR (110 users at $19/mo) by month 4. Zero employees, zero ads.

The story

The product is one page. Paste a competitor URL. Claude scrapes it, analyzes the structure, and returns a content brief with target keywords, headings, word count, and angle suggestions.

The wedge was that existing tools (Surfer, Frase) cost $99-200/mo and are bloated. This tool does one thing for $19/mo. Solo SEOs and freelancers signed up immediately.

No marketing site, no blog, no funnel. Just the tool, a Stripe checkout, and a Twitter account that posted a daily example.

The exact stack

Tools they used. Click any to start with the same setup. Total cost: ~$95/mo

🌐

Cloudflare

Domain (at-cost) · $10/yr

▲

Vercel

Next.js hosting · Free → $20

🧠

Claude API

Claude Sonnet for analysis · ~$45/mo

🗄️

Supabase

Auth + usage tracking · Free

💳

Stripe

Subscriptions · 2.9% + 30¢

The playbook

Find a $99/mo tool that does too much

Look at any SaaS in your space charging $99+/mo. 80% of users only use one feature. Build that one feature for $19. The math works.

Ship in a weekend, no exceptions

Next.js + Vercel + Claude API + Stripe Checkout = a working product in under 48 hours. If you can't ship in a weekend, the scope is too big.

Launch on Product Hunt + 2 subreddits

PH gives you a 24-hour traffic spike. Pair with /r/SEO and /r/SideProject for sustained interest. Don't spam — post once, reply to every comment.

Daily public examples on Twitter

Every day, run the tool on a public competitor and post the output. Free marketing + you become the recognized expert in the niche.

No free tier — paid trial only

$19/mo with a 7-day money-back guarantee converts better than free → paid. Filters out tire-kickers and gives you cash flow from day 1.

Revenue breakdown

110 users × $19/mo$2,090

Stack costs-$95

Stripe fees-$70

Net~$1,925

🎯 Key takeaways

→Unbundle expensive incumbents. One feature at 1/5 the price wins.
→No free tier when the product is cheap. Friction filters serious buyers.
→Daily public examples = compounding marketing for free.

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