标签：#hack

Marketplace sellers often discover image problems too late. A product photo may look fine in an editor, but after uploading it to a marketplace it can become: cropped in search thumbnails too small for zoom previews the wrong aspect ratio for a sales channel risky for Amazon-style main image requirements awkward when reused across Etsy, Amazon, TikTok Shop, Shopify, eBay, or Walmart I wanted a simple preflight step before publishing product images, so I built ListingPic : 👉 https://listingpic.com/ What it does ListingPic is a browser-based marketplace image checker and resizer. You upload a product photo, choose the marketplaces you care about, and get a readiness report covering things like: image dimensions aspect ratio file type file size thumbnail crop risk safe-area positioning marketplace-specific warnings The goal is not to replace manual review. It is to catch obvious image risks before sellers waste time uploading, previewing, deleting, resizing, and re-uploading. Why local-first? A lot of product photos are sensitive: unreleased SKUs private product photography branded assets client images images sellers do not want copied or stored elsewhere So ListingPic processes images locally in the browser. Your images are not uploaded to our server for analysis. That also makes the tool fast for quick checks: drop in an image, review the warnings, adjust before publishing. Current checkers The MVP includes marketplace-focused checks for: general marketplace readiness Etsy image checks Amazon product image checks TikTok Shop image checks There are also entry points for Shopify, eBay, and Walmart workflows. Example use case Imagine you have one product photo and want to reuse it across multiple channels. ListingPic can help answer: Is the image large enough? Will the product be cut off in thumbnails? Is the image close enough to square for a channel that prefers square previews? Is the product too close to the edge? Do I need a separate crop for Etsy or TikTok Shop? D

Finding grants means digging through 50 scattered Discords, blogs, websites, and Notion pages. So I built a fix. Meet Web3 Accelerator GrantHub (W3AGH). What is GrantHub? GrantHub is a web app that helps Web3 founders discover funding opportunities without digging through dozens of scattered websites. Grants are listed across ecosystems like Solana, Ethereum, Polygon, BNB Chain, Arbitrum, Base, and more. The idea is simple: instead of spending hours searching for funding opportunities, you should be able to find relevant grants in one place. GrantHub also has AI tools that sit on top of the grant database. You can describe your project once and instantly see which grants fit best. Why GrantHub? Funding is the lifeblood of Web3 startups, but finding grants today is painful. Scattered listings Every ecosystem publishes its own programs on its own website, blog, Discord, or other channels. There is no single source of truth. Stale information Grants expire, close, or change their requirements, while the listings founders rely on can remain outdated. Manual matching A founder has to read through each grant's requirements and figure out whether their project qualifies. With dozens of grants available, that can quickly turn into hours of work. No personal workflow There is no single place to save interesting grants, track applications, or ask questions about a specific program. GrantHub is built around solving these problems. It combines three things: One central catalog of grants stored in a real database. Personal tools: accounts, favorites, and a personal dashboard. AI assistance: a grant ranking engine, an AI assistant, a smart-contract auditor, and context-aware chat on every grant page. Who is this for? Solo builders and startups: looking for funding or ecosystem support. Beginners who don't yet know which ecosystems and grants are right for them. Anyone who would rather spend their time building than hunting for funding. The goal isn't to create another directory o

Hey HN, we're Advaith and Akash from Discovered Materials ( https://discoveredmaterials.com/ ). We build AI agents that discover new materials for the semiconductor industry. GPUs today have a heat problem. Nvidia & AMD are almost doubling the TDP (Thermal Design Power) in every chip they release - the H100 (released 2022) has a TDP of 700W, Blackwell (2024) gives out 1.2 kW and Rubin (2026) gives out at 2.3 kW of heat. This trend is expected to continue, and getting rid of this heat is one of t