SanityCheck – Validate your startup idea quickly with real feedback

Summary: SanityCheck.dev lets users post startup ideas to receive honest, early-stage validation from the internet. It provides real signals and feedback to help founders assess market interest before investing significant time in development.

What it does

Users submit their startup ideas or prototypes to SanityCheck.dev, where they receive immediate, unfiltered feedback from the community. This process helps gauge genuine interest and validate concepts before full product development.

Who it's for

SanityCheck is designed for early-stage founders and creators seeking to test their ideas and avoid optimism bias before committing to building.

Why it matters

It addresses the problem of investing months into projects without market validation by providing actionable insights early, reducing the risk of building unwanted products.