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Work · February 1, 2021

TestStacks - validate your business idea

Free experiment toolbox to make your business idea succeed.

TestStacks - validate your business idea launched on February 1, 2021 with 3 votes. The site was still online in September 2026, 5 years on.

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What it does

Are you a start-up entrepreneur? Why not give your next idea the best possible chance of success by using experiments to validate your idea before you invest endless time and money... Simply choose a stack of experiments and get started.

Free CCAT practice tests, no signup. The only CCAT prep where all 650+ questions carry a speed strategy: the fastest route to each answer under the 18-second clock. Timed simulations, subcategory drills, spaced mistakes review, and score analytics. Used by candidates at Coinbase, Crossover, Gauntlet.ai, and more.

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    I 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/

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