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Startup ideas with revenue receipts, reverse-engineered from founder interviews.

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TierT1T2T3EvidenceVerifiedFounderCreatorUnprovenEvergreenWindow
Simple Tool ↓
AI ContentAI E-commerceAI ServiceAI WebsiteConsumer AppDigital PublishingDirectory SiteEcosystem ToolPlatform PluginSaaSScale ReferenceSimple Tool⚠️ Cautionary Tale
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RevenueIdeaCategory · Evidence · Difficulty
#1
$170K-660K/moT2
WordUnscrambler (Boring Tool Site)
A word-unscrambling tool site with 10M monthly visits living purely off AdSense display ads — build it once, run it for a decade
Simple ToolT2
Simple Tool
#2
$200K/moT2
TinyURL Clone Link Shortener (Replit + AdSense)
Clone a URL shortener with zero code using Replit and collect pure passive ad revenue from Google AdSense

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Simple ToolT2
Simple Tool
#3
$25K/moT2
Stagetimer
A remote-controlled countdown timer for speakers and show callers
Simple ToolT2
Simple Tool
#4
$8.5K/moT2
PDFShift
An HTML-to-PDF API for developers, billed per request
Simple ToolT2
Simple Tool
#5
$15K/moPROT2
AudioPen
Ramble into your phone, and AI turns the mess into a clean note — a no-code tool built in a 12-hour hackathon that now makes $15K/month
Simple ToolPROT2
Simple Tool
#6
$20K/moT2
CleanVoice (podcast audio cleanup)
One button that strips filler words, background noise, long silences and mouth clicks out of a podcast — $20K/month from a feature nobody wanted to build a company around
Simple ToolT2
Simple Tool
#7
2.6M organic v…PROT2
Humanize AI Pro — a two-page site pulling 2.6M organic visits a month
Two pages, one input box, zero social media: an exact-match domain that rewrites AI text into human-sounding text and gets 2.6 million Google visitors a month on the back of 1,700 referring domains
Simple ToolPROT2
Simple Tool