1/ There are a lot of fake builders out there engagement farming....
The Founders’ Log@thefounderslog
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Jan 17, 2026
~3 min read
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1/ There are a lot of fake builders out there engagement farming.
Here’s how to actually build, market, and sell an app in 2025 using AI at every step without raising money or wasting 9 months.
This is the exact playbook I’ve seen work time and time again.
🧵
Here’s how to actually build, market, and sell an app in 2025 using AI at every step without raising money or wasting 9 months.
This is the exact playbook I’ve seen work time and time again.
🧵
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2/ Step 0: Idea validation with money (AI makes it stupid easy)
Use Claude 3.5 Sonnet (or Opus if you have Pro) + Cursor composer.
Prompt:
“Act as a ruthless pre-sales consultant. Here’s the idea: [paste idea]. Write a 5-email cold outbound sequence that feels human and converts 3-5% meetings. If you can’t make it believable, tell me the idea is dogshit.”
If Claude can’t write a believable sequence → kill the idea and move on. Don’t waste your time on things you can’t sell.
Use Claude 3.5 Sonnet (or Opus if you have Pro) + Cursor composer.
Prompt:
“Act as a ruthless pre-sales consultant. Here’s the idea: [paste idea]. Write a 5-email cold outbound sequence that feels human and converts 3-5% meetings. If you can’t make it believable, tell me the idea is dogshit.”
If Claude can’t write a believable sequence → kill the idea and move on. Don’t waste your time on things you can’t sell.
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3/ Step 1: Build the landing page + waitlist in <4 hours
Tools:
- Cursor + Claude 3.5 Sonnet (code + copy)
- v0.dev (Vercel) for UI components
- Vercel for hosting
- Lemon Squeezy for payment
Process:
1. Paste your idea into Cursor
2. “Build a high-conversion landing page in Next.js 15 + Tailwind + Shadcn. Hero, features, social proof section, pricing with Lemon Squeezy checkout, waitlist form.”
Done. Live in ~3 hours.
Tools:
- Cursor + Claude 3.5 Sonnet (code + copy)
- v0.dev (Vercel) for UI components
- Vercel for hosting
- Lemon Squeezy for payment
Process:
1. Paste your idea into Cursor
2. “Build a high-conversion landing page in Next.js 15 + Tailwind + Shadcn. Hero, features, social proof section, pricing with Lemon Squeezy checkout, waitlist form.”
Done. Live in ~3 hours.
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4/ Step 2: Charge money Day 1
Lemon Squeezy checkout.
Exact copy I use:
“First 50 users get lifetime access at 70% off. Join now to secure your spot.”
Average conversion on this page right now: 8–12%.
AI tool for copy: Claude + prompt “Make this copy convert higher than Stripe’s billing page.”
Lemon Squeezy checkout.
Exact copy I use:
“First 50 users get lifetime access at 70% off. Join now to secure your spot.”
Average conversion on this page right now: 8–12%.
AI tool for copy: Claude + prompt “Make this copy convert higher than Stripe’s billing page.”
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5/ Step 3: Build the actual app (MVP in 7–14 days)
Stack I use on every project in 2025:
- Cursor.sh (VS Code fork with Claude built-in) → 70+% of code written by AI
- Supabase (DB + Auth + Edge Functions)
- Vercel
- Replicate or Together.ai for any heavy models
Cursor is non-negotiable. It’s 5–10x faster than Copilot. I can build a full SaaS backend in a weekend now.
Stack I use on every project in 2025:
- Cursor.sh (VS Code fork with Claude built-in) → 70+% of code written by AI
- Supabase (DB + Auth + Edge Functions)
- Vercel
- Replicate or Together.ai for any heavy models
Cursor is non-negotiable. It’s 5–10x faster than Copilot. I can build a full SaaS backend in a weekend now.
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6/ Step 4: Marketing channels that still work cold in 2025
1. Twitter/X (this account style; raw operator voice)
2. Reddit (post in the exact sub your ICP lives in, no “launch” post, just value + link in comments)
3. Cold email (Instantly.ai + whatever sequencing tool you prefer)
4. LinkedIn if B2B (post like you tweet here, but longer)
5. TikTok if consumer brand (UGC is great here)
6. Meta if consumer brand (repurpose your TikTok content)
If you’re going to use AI for copy: Claude 3.5 Sonnet is the best. Nothing else is close right now.
1. Twitter/X (this account style; raw operator voice)
2. Reddit (post in the exact sub your ICP lives in, no “launch” post, just value + link in comments)
3. Cold email (Instantly.ai + whatever sequencing tool you prefer)
4. LinkedIn if B2B (post like you tweet here, but longer)
5. TikTok if consumer brand (UGC is great here)
6. Meta if consumer brand (repurpose your TikTok content)
If you’re going to use AI for copy: Claude 3.5 Sonnet is the best. Nothing else is close right now.
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7/ Step 5: Sales motion that actually closes
Sequence:
Email 1–3: Problem + proof (screenshots of results)
Email 4: “Here’s the app.”
Email 5: Loom walkthrough + “Last chance”
Close rate on this motion right now: 12–18%.
Sequence:
Email 1–3: Problem + proof (screenshots of results)
Email 4: “Here’s the app.”
Email 5: Loom walkthrough + “Last chance”
Close rate on this motion right now: 12–18%.
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8/ Step 6: Weekly revenue filter (the only metric I care about)
Every Monday I ask:
“Did the people who touched the product last week pay us more than they cost us?”
If no for 3 weeks straight → kill or pivot.
This filter alone is why I’m 3x revenue in my last 18 months. Profit is all that matters, make sure it’s what you focus on the most.
Every Monday I ask:
“Did the people who touched the product last week pay us more than they cost us?”
If no for 3 weeks straight → kill or pivot.
This filter alone is why I’m 3x revenue in my last 18 months. Profit is all that matters, make sure it’s what you focus on the most.
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9/ That’s the entire playbook.
No seed round.
No “idea validation” surveys.
No “beautiful design” that looks like everything else.
No waiting for perfect.
Just AI + revenue focus + speed.
If you’re actually building something real right now, reply with your one-sentence idea.
No seed round.
No “idea validation” surveys.
No “beautiful design” that looks like everything else.
No waiting for perfect.
Just AI + revenue focus + speed.
If you’re actually building something real right now, reply with your one-sentence idea.
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There’s obviously a lot of nuance to each step, but this general framework 100% works. You just have to be willing to put in the time and effort to learn the tools required. If you’re willing to do that, you can build anything.