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    Kolkata Gold PriceWeb app · Recorded 18K, 22K and 24K gold rates for Kolkata, in English and Bengali.
  • FeedKeeperBrowser extension · Hides the YouTube videos you don't want. Keeps the ones you came for.
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    A Napoleonic cipher and Grad's conjecture: what AI actually didGPT-6 Astra helped decode an 1809 cipher letter to General Marmont and find counterexamples to Grad's 1967 plasma conjecture. What happened, and what it means.
  • How to stop AI-built websites looking the sameWhy sites built by AI coding agents look alike, and the tools that help: Hallmark, Impeccable, the 21st.dev MCP, Archify for diagrams, and asking for variants.
  • FeedKeeper: a YouTube feed filter that works by categoryWhy we built FeedKeeper, a Chrome extension that hides the kinds of YouTube videos you choose from your home feed and Up next, and how its three modes work.
  • Free AI tools worth trying: job search, video, browsing and moreEight open-source AI tools from this month's GitHub trends, checked against their own docs: what each does, what it costs, how to install it, and the catch.
  • Gemini 4 Argon vs GPT-6.1 Sol vs Claude Sonnet 5.5Three frontier models launched in three days. Prices, limits, benchmarks, cost per task and availability for Gemini 4 Argon, GPT-6.1 Sol and Claude Sonnet 5.5.
  • Installing Claude Code skills and MCP servers safely: a checklistAgent skills and MCP servers run with your permissions. Real incidents, what to check before you install one, and how to limit what it can reach.
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blog · engineering

How our tools work, under the hood

How our products are built: architecture, trade-offs, performance work and lessons learned.

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