powCAPTCHA

What it does

Next-gen Proof-of-Work Privacy-First CAPTCHA that stops bots and filter spam. Pure security, zero friction.

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  ZENCAPTCHA2023 · ▲115

  Privacy-first bot & spam defense, GDPR compliant CAPTCHA

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  adCAPTCHA2024 · ▲148

  Secure your site, elevate your brand, boost ad revenue

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  Cap2025 · ▲431

  A lightweight, modern open-source captcha

• CH
  CodeCaptcha - Hide web links behind coding challenges2022 · codecaptcha.io · ▲163

  Hello HN, I made this silly project over the long weekend. It’s pretty basic right now and the captchas are very easy. I plan to add captcha difficulty levels for link creators soon.

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  WeHateCaptchas2019 · ▲208

  Keep the bots out without annoying your users

• RC
  Replace CAPTCHAs with WebAuthn passkeys for bot prevention2024 · github.com · ▲71

  I built Nocaptcha after getting frustrated with traditional CAPTCHAs both as a user and developer. WebAuthn passkeys offered a promising alternative that's both more secure and user-friendly. What makes Nocaptcha different: - Uses WebAuthn standard instead of puzzle-solving - No need for users to remember passwords or solve puzzles - Open source Current limitation: Working with W3C WebAuthn Community Group on true passkey disposal for this use case. Looking for feedback particularly on: 1. Integration experience 2. User experience compared to traditional CAPTCHAs

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  Dograh▲592

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  Meridian▲530

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  Lettertrace▲375

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• IM
  I'm an airline pilot – I built interactive graphs/globes of my flights▲1,539

  Hey HN! Pilots everywhere are required to keep a logbook of all their flying hours, aircraft, airports, and so on. Since I track everything digitally (some people still just use paper logbooks!), I put together some data visualizations and a few 3D globes to show my flying history. This globe is probably my favourite so far: https://jameshard.ing/pilot/globes/all If you’ve got ideas for other graphs or ways to show this kind of data, I’d love to hear them!

  Life & fun · 2025 · jameshard.ing

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  Twenty▲991

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  Pally - AI Relationship Management▲949

  All your connections, across all your socials.

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• WC
  Workout.cool – Open-source fitness coaching platform▲827

  I was the main contributor to workout.lol, an open-source fitness app to easily build a workout routine. The project had traction (1.4k GitHub stars, 95 forks, ~20K visits/month), but was eventually sold due to video licensing hurdles. The new owner stopped maintaining it, and the repo went abandoned. Over the next 9 months, I sent 15 emails to try to save it : no replies. Feature requests & issues were ignored. The community was left with a "broken" tool let's say. I couldn't just let it die So I built the new version from scratch with the same open-source spirit, but a better…

  Dev tools · 2025 · github.com