Online Calculators & Tools

What it does

Explore free online calculators for games, school, finance, engineering, and everyday tasks, plus useful generators, converters, and other tools.

Practical calculators for students, engineers, gamers, and finance or tax planning—with transparent formulas and verifiable sources. Use this AP Biology score calculator to combine multiple-choice and free-response practice points into a weighted composite and predicted AP Bio score. Use this AP Calc AB score calculator to combine multiple-choice and free-response practice points into a weighted composite and AP score prediction. Try this AP Calc BC score calculator to combine multiple-choice and free-response practice points into a weighted composite and predicted BC score. Try this AP Chemistry score calculator to combine 60 MCQs and free-response rubric points into a weighted composite…from onlinetool.me

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  Free Online Calculators25d ago · calculatorpath.com · ▲3

  Free Online Calculators - Math, Finance, Fitness & More

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  Online Calculator Tools20d ago · onlinecalculatortools.com · ▲1

  150+ free calculators for everyday decisions

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  CalculatorNinjas2024 · ▲117

  Ultimate online calculator for finance, health, stats & Math

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  Utility Tools — Free Online Calculators5d ago · orangescar03.github.io · ▲1

  Free online calculators and useful tools, all in one place

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  ToolSunny27d ago · toolsunny.com · ▲2

  Free calculators, converters, generators and templates

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  Fine Calculators6d ago · finecalculators.com · ▲1

  Fine Calculators online tools for quick,simple,and everyday

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  Dograh▲592

  The open source VAPI alternative

  Dev tools · 25d ago · dograh.com

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  Meridian▲530

  Don't let your work go unnoticed. Get promoted!

  Dev tools · 20d ago · meridiona.com

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  x1▲516

  Lovable for iPhone apps go from idea to App Store

  Dev tools · 11d ago · x1.new

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  The GTM Co-Founder▲402

  Open-source GTM skills for technical founders

  Dev tools · 29d ago · gtmcofounder.com

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  Open-Source eInk Bike Computer▲389

  OpenTrailPaper is open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO. It supports offline maps, GPX routes, FIT recording and Bluetooth sensors.

  Dev tools · 1d ago · opentrailpaper.com

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  Nuphos▲380

  The AI-Native DevOps Workspace.

  Dev tools · 24d ago · nuphos.ai

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  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 · adant.ai

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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 · 17d ago · simedw.com