nowfound

Life & fun · May 6, 2026

Free tool to mark points and polygon regions

For a game I'm developing I needed an easy way to create hotspot areas on images. So I hacked together a small tool to do so and before I knew it, I had created an entire app :-) It allows you to generate JSON or YAML from the coordinates you tack on the image. tack runs entirely in your browser, there is no server side component to it, so good in terms of privacy. Hope this is helpful.

Free tool to mark points and polygon regions launched on May 6, 2026 with 21 votes, #896 of 20,538 launches that month and more than 90% of that year's launches.

Visit tack.pics ↗Alternativestop 4% of May 2026

In plain words

Tack is a browser-based tool for game developers and designers to mark points and polygon regions on images. Users place markers to define hotspot areas, then export the coordinates as JSON or YAML data. The application runs entirely in the browser with no server component, keeping all data private. It's designed to streamline the process of creating interactive area definitions for game development.

written from the facts on this page · September 2026

From the sources

Mark points and polygon areas on any image. Export to JSON or YAML. Free, in your browser, no upload.

Marking pixel-precise points and pulling bezier handles needs more room than a phone gives. Open tack.pics on a tablet or desktop browser to use the tool. A precision tool for marking points and polygon regions on images. Free, runs entirely in your browser — your images never leave your device. tack. is built for game developers, level designers, UI engineers, ML data labelers, and anyone who needs to translate a picture into a structured set of coordinates. Drop in an image, click to drop points, drag to draw bezier curves, and export clean JSON, YAML, or an HTML image map you can paste straight into your code. Choose where the origin sits — top-left for screen space, bottom-left for math…from tack.pics

Does a similar job

all alternatives →
  • Pictogon2017 · ▲583

    The fastest and easiest way to create interactive images

  • IB
    I built an indie, browser-based MMORPG2024 · alpha.reconquer.online · ▲340

    I've been working on an MMORPG that is now in alpha as a solo developer. Here are the major open source technologies that I use: Blender - 3D modeling software for creating the overall environment and every game object. I've gotten a lot of CC and Public Domain assets from https://poly.pizza GLTF - I export assets from blender to the GLTF asset format JSON - I write a JSON config for every game object that describes things like its name, its interactions, its collisions, etc. Node.js exporter - I iterate over the environment and every asset to create a scene hierarchy. I use…

  • TerrainVer – Generate Worms-Style Cartoon Terrain in JavaScript2018 · juliango202.com · ▲198

    Explore advanced web development for online casinos at Juliango 202. Learn about programming languages, RNG algorithms, and secure platform architecture.

  • LW
    Learn where countries are on the world map with Spaced Repetition2025 · map.koljapluemer.com · ▲217

    Hi HN, I made a web game to practice country locations a while ago and HN liked it, so I thought I'd post my updated version as well. As for how the game works and feels, I'd really recommend you checking it out for yourself, it's free, no signup, no ads. The tech stack is Vue + ts + Tailwind/Daisy for the looks. The learning algorithm is a slight modification of the ts version of FSRS. If you have anything to add, it's open source as well (https://github.com/koljapluemer/learn-worldmap), although not well documented yet. In the end it's just a little sideproject,…

  • Flatmap – a new tool to make vector tiles from OpenStreetMap data fast2021 · github.com · ▲158

    Flexible tool to build planet-scale vector tilesets from OpenStreetMap data fast - onthegomap/planetiler

  • IM
    I made a WebGL-based app that traces images using circles2022 · phqb.github.io · ▲93

    I was fascinated by this [0] and this video [1]. After many struggles, I finally built this app that traces images using circles similar to what these videos had shown. The most challenging part (to me) is to find a way to convert images to vector lines. I had tried Potrace, but its output is not suitable for my use case: too many small elements share the same border. Potrace's goal is to represent the original image faithfully using vector lines. But I want to trace the image edges. After searching and trying some Potrace alternatives in vain, I finally found my keyword. Surprisingly (to…

More life & fun this month

the category →

Source: Show HN post ↗

Launched alongside, May 2026

the whole month →
  • Brew ▲900

    Like Claude design for email marketing

    AI · May 2026 · brew.new

  • Kilo Code for VS Code▲896

    Parallel agents, diff reviewer, and multi-model comparisons

    Dev tools · May 2026 · kilo.ai

  • StoreClaw▲806

    Grow your store profits with agents that know how to sell

    AI · May 2026 · storeclaw.ai

  • PollyReach▲795

    Give your agent a real number and voice to make calls.

    AI · May 2026 · pollyreach.ai

  • Needle: We Distilled Gemini Tool Calling into a 26M Model▲776

    Hey HN, Henry here from Cactus. We open-sourced Needle, a 26M parameter function-calling (tool use) model. It runs at 6000 tok/s prefill and 1200 tok/s decode on consumer devices. We were always frustrated by the little effort made towards building agentic models that run on budget phones, so we conducted investigations that led to an observation: agentic experiences are built upon tool calling, and massive models are overkill for it. Tool calling is fundamentally retrieval-and-assembly (match query to tool name, extract argument values, emit JSON), not reasoning. Cross-attention…

    Life & fun · May 2026 · github.com

  • Files.md – Open-source alternative to Obsidian▲730

    🌱 Private, quiet space for thinking. Simple app for .md files. - zakirullin/files.md

    Dev tools · May 2026 · github.com