ReactionMetric
Free browser reaction time test with multi-trial median, consistency tracking, and transparent device context.
About
ReactionMetric is a free online platform designed to measure visual and auditory reaction times, click speed, and reflexes through structured browser-based tests. It is built for individuals who want to check their speed, track personal performance trends, and compare results across sessions using a transparent measurement approach.
The platform is intended for users interested in tracking their personal benchmarks, testing input hardware performance, or exploring response speed data. It uses a multi-trial protocol—typically five trials per test—to calculate median scores and consistency ratings, reducing the impact of single lucky clicks or accidental outliers.
What makes ReactionMetric different is its focus on hardware and browser context rather than hidden score corrections. It records details like device type and display refresh rates to provide fair comparisons with similar setups, while keeping personal history directly in the browser.
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FounderPlaybooks.
What other founders did to grow.
2722 dispatches from hundreds of founders, pulled from the week's best podcasts.
We also had a Discord, I think up to 7,000 members now, we used it for a community to hype up new features, stuff like that.
Build a Discord Community to Own Your Audience Without a Login Wall
With a free, ad-supported product and no email list or login requirement, Discord became Maddox's only owned retention channel. A 7,000-member community that self-amplifies new feature announcements keeps users returning without any paid re-engagement spend. For consumer products with no paywall, Discord fills the role that an email drip sequence would play for a SaaS.
All in all cost is around like $3,500 per month. And obviously we're not doing any paid marketing yet… everything is organic. All my traffic is coming from X, so that's why the margins are higher.
$3.5K/month in infra is the only real cost when distribution is organic
Keep the cost stack lean and skip paid acquisition entirely while organic content is working. With infrastructure and AI APIs as the only meaningful expenses, margins stay high and the business funds its own growth.
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