Yubook

What it does

Paste a draft. Yubook scores it against X's published ranking signals before it goes out: reply, share, or mute. Then it ranks fresh posts from accounts you follow, so a reply can still land in front of someone else's readers. No follow-for-follow. Does not post to X for you. You get a seven-day plan, a watch list from accounts you follow, follower tracking, AI rewrites, and Threads when you press publish. Free: search-visibility check and best hours. Korean & English. $7.9/week or $69.9/year.

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  Copydue2019 · ▲141

  Top writers, on-demand for as low as $150/mo

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  Winnow18d ago · winnowapp.app · ▲13

  Grow on X by replying to the right posts

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  PostKingFeb 2026 · ▲37

  Stop sounding like ChatGPT. Start sounding like your brand.

• FD
  First Draft (beta) – distraction-free writing for first drafts2014 · beta.firstdraft.io · ▲11
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  Prose Coach19d ago · prose.coach · ▲14

  Write with AI. Just don't sound like it.

• RM
  Review my startup : Risely – Filtering your social news2013 · ▲10

  Link: www.rise.ly Hey guys, We just finished building our site, and would be very grateful if some of you guys could test it out. Basically, Risely is curation platform that filters the noise from your social stream and only shows you stories on topics you care about. You just need to connect your social networks and select your topics. Trending stories get bigger as they get more popular. We are in private beta right now, but I have made arrangements and you will receive an invite 5 or 10 minutes after you signup. Thanks

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  AstraPixels▲267

  ​​A pixel-art solar system at its real current positions.​

  Growth · 29d ago · astrapixels.com

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  WorldMap.lol▲197

  Put your startup on the map. Literally.

  Growth · 13d ago · worldmap.lol

• TL
  The load-bearing vocabulary of Claude▲703

  Life & fun · 10d ago · louisabraham.github.io

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  Hey Noah▲641

  A proactive AI executive assistant for founders

  AI · Aug 2026 · heynoah.io

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  Clipto MCP▲640

  Let agents source clips from terabytes of your local video

  Work · 18d ago · clipto.com

• SA
  Simple algorithm and color space to generate diverse skin tones▲627

  Hello HN! I found that picking out plausible but diverse skin tones for my digital art and game development projects was kind of difficult, and I got curious about if there was a way to define a color space that made it easy. I've built a color picker and procedural generation algorithm based on the space as well as a bunch of other fun js features and demos throughout the page that use the equations. If you find it interesting, I have lots of explanations of how I built it and what properties the space has. The methodology might be a bit shaky, but hopefully the result is as helpful for…

  Life & fun · Aug 2026 · toneyalexander.github.io

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  AdAnt AI▲608

  Claude for viral, high-converting social ads

  AI · Aug 2026

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  I trained a 125M model to autocomplete piano on-device▲598

  I trained a 125M-parameter transformer to autocomplete piano performances in real time (~108 notes/sec on an iPhone 15). The idea is basically GitHub Copilot or Tabnine, except instead of prompting it with code, you prompt it by playing a few notes on a MIDI piano. The model then continues what you played, entirely on-device. The app is free if anyone wants to try it. Happy to answer questions about the model, training, Core ML, or the many things that didn't work.

  AI · 16d ago · simedw.com