SanityCheck
Validate your startup idea in minutes — not months.
What it does
Stop building in the dark. Stop asking your mom if your startup idea is good. Stop guessing whether people want what you're about to spend 3 months building (or 3 days vibe coding). I made a fix: SanityCheck.dev You post your idea. The internet tells you the truth. You get real signals, not optimism bias. If you’re brave enough, submit your idea: sanitycheck.dev
Does the same job
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- ASA site to help you validate ideas in bulk2020 · ▲93
Hi HN! I made a really quick web app to help people validate their ideas. The app is a simple landing page builder, but every page includes a really simple Yes/No "Are You Interested?" poll. Every vote is recorded and tracked, and if they click yes they are brought to a page where they can submit an email. This makes validating ideas super easy because you can post your link to different communities and get statistically significant results as well as build an email list. Given an hour, you could easily create 50 different landing pages and be able to validate your ideas in bulk. The…
- IAI accidentally built a startup idea validation tool2025 · validationly.com · ▲15
I was working on validating some of my own project ideas. While trying to find how to validate my idea, I realized the process itself could be turned into a tool. A few late nights later, I had something that takes any startup idea, fetches discussions, summarizes sentiment, and gives a quick “validation score.” It’s very rough, but it works, and it’s already making me rethink a few of my own ideas. It's still a work in progress. I don't actually know what I'm doing, but I know it's worth it. Honest feedback welcomed! Live demo here: https://validationly.com/
IdeaCheckJun 2026 · idea-check-striveonai.vercel.app · ▲2Stress-test your startup idea before wasting months on it
Is My Idea Valid? Startup Idea ValidatorJun 2026 · ismyideavalid.com · ▲15Validate startup ideas in seconds before wasting months
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