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Dev tools · March 17, 2026

EchoFilter

Stop bot leads. Score every submission in real time.

What it does

EchoFilter detects bots and spam form submissions in real time using behavioral biometrics. No CAPTCHA. Works with any website, WordPress, Contact Form 7, WPForms, and Gravity Forms. Free to start.

Does the same job

all alternatives →
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  • MS
    Make senders work to get into your inboxJul 2026 · captchainbox.com · ▲44

    Hi HN :) really excited to share this with you. The one thing AI reliably does is generate noise. Half the tools I see launch are just machines for producing more noise across more channels. And people are starting to see this in the form of emails in their inboxes as spam filters are struggling. There used to be a useful signal in email: the effort a sender put into customizing a message was a rough proxy for how relevant it actually was. AI killed that. Now it's customized slop with the appearance of effort with none of the cost. It is painful that the open internet / open channels…

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