Founder tested 12 startup ideas with cold emails at once — one got 14 yeses
doooyle · x · 2026-11-16
An indie hacker shared how he validated 12 startup ideas simultaneously with Claude Code: built one landing page per idea, pulled 10k founders/marketers for cold outreach with 12 randomized email variants, and linked positive responders to landing pages to measure engagement. 11 ideas got 1-2 yeses each; one got 14, clear enough to build. It became Book a Sponsor, which now pitches brands for 100 newsletters, podcasts, and YouTube channels. The main tweet complains about LLM slop replies; commenters noted demand-testing replies can literally write your landing page copy.
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