Software Carbon Intensity Calculator

What it does

The world’s first open SCI Calculator, based on methodology from the Green Software Foundation and ISO 21031 standards. Enables GHG data tracking for all software types, helping developers, C-suites, and sustainability reporters measure, and report emissions.

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  Carbon Interface 1.02020 · carboninterface.com · ▲115

  Measure carbon emissions with an API

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  Website Carbon Calculator2019 · websitecarbon.com · ▲105

  Find out the how much CO2 your website emits

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  Carbon Neutral Website2023 · carbonneutralwebsite.org · ▲107

  Calculate and optimize web page carbon footprint

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  CarbonSutra2023 · carbonsutra.com · ▲70

  API for estimating carbon emissions of organizations

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  Bend2022 · ▲130

  1 click carbon accounting for startups

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  Climatiq Emission Tracking API2022 · climatiq.io · ▲182

  Convert activity data into carbon metrics, automatically

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  /dev/null▲484

  a social network for devs

  Dev tools · 3d ago · dev-null.sh

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  Whiteboard (YC W26) – an open-source IDE for thoughtful software design▲423

  open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.

  Dev tools · 28d ago · github.com

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  Reladraw – A diagram language where you decide where to place things▲411

  Contribute to reladraw/reladraw development by creating an account on GitHub.

  Dev tools · 26d ago · github.com

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  OpenBot▲362

  Grok Bot alternative: free, local, open-source, multiplayer

  Dev tools · 23d ago · openbot.run

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  Talanoa▲346

  Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…

  Dev tools · 21d ago · talanoa.email

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  CoreSpeed▲332

  One MCP for everything your agents need: apps, memory, tools

  Dev tools · 28d ago · corespeed.io

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  I made an open-source laptop from scratch▲3,237

  Hello! I'm Byran. I spent the past ~6 months engineering a laptop from scratch. It's fully open-source on GH at: https://github.com/Hello9999901/laptop

  Dev tools · 2025 · byran.ee

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  Tetris in a PDF▲1,289

  I realized that the PDF engines of modern desktop browsers (PDFium and PDF.js) support JavaScript with enough I/O primitives to make a basic game like Tetris. It was a bit tricky to find a union of features that work in both engines, but in the end it turns out that showing/hiding annotation "fields" works well to make monochrome pixels, and keyboard input can be achieved by typing in a text input box. All in all it's quite janky but a nice reminder of how general purpose PDF scripting can be. The linked PDF is all ASCII so you can just open it in a text editor, or have a look at…

  Life & fun · 2025 · th0mas.nl

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  21st.dev▲1,211

  I originally built this app to organize and reuse interesting React + Tailwind components I came across on Twitter, inspired by the shadcn/ui approach. Later, a friend started contributing their own components, and it got me thinking—this could grow into something bigger, like an NPM for design engineers to share and use components. Would love to hear your thoughts!

  Dev tools · 2025 · 21st.dev

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  JoggAI 2.0: AI Avatar Generator▲967

  Create lifelike, personalized AI avatars from text prompts

  AI · 2025 · jogg.ai

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  Lovable + Builder.io▲873

  Turn Figma designs into full stack apps with AI

  Dev tools · 2025 · figma.com

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  Cs16.css – CSS library based on Counter Strike 1.6 UI▲819

  CSS library based on Counter Strike 1.6 UI.

  Life & fun · 2025 · cs16.samke.me