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Show HN: OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity
A lightweight, open-source, zero-install IDE clone of Google Antigravity, built with pure Vanilla JS and WebContainer API, offering BYOK for AI agents and custom agent workflows. Addresses usage limits and errors of the original.
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AI Executive Synthesis
A lightweight, open-source, zero-install IDE clone of Google Antigravity, built with pure Vanilla JS and WebContainer API, offering BYOK for AI agents and custom agent workflows. Addresses usage limits and errors of the original.
OpenGravity targets developers seeking a lightweight, customizable, and open-source in-browser IDE, specifically addressing limitations of proprietary tools like Google Antigravity. Its "zero-install" and "BYOK" (Bring Your Own Key) model reduces friction and enhances user control over API costs and data. The use of WebContainer API for a real in-browser Linux environment is a significant technical differentiator, enabling complex agent workflows not possible with simulated terminals. This product taps into the demand for flexible, transparent development environments and the burgeoning market for AI-assisted coding tools. As an alpha, its potential lies in community contributions to refine the agent loop and UI, offering a foundational platform for innovative developer tooling.
Hi. I’m a high school student studying for my GCSEs. I was using Google Antigravity heavily for my side projects, but I kept hitting the usage limits, and getting random "agent terminated" errors. So I decided to try build my own version of the IDE. I love the UI, so I copied it as accurately as possible, and then hooked up some logic into it, including the INCREDIBLY finicky webcontainer api.I tried to keep it super lightweight, no build steps, or dependencies, and now that its open source, I'm hoping people can build things on top of it that arent possible with closed source tools, like complex custom agent workflows.Some screenshots: - https://github.com/ab-613/OpenGravity/blob/main/examples/scr... - https://github.com/ab-613/OpenGravity/blob/main/examples/htm...What it's made from:- Pure Vanilla JS: no react, vue, or build step. Built entirely in plain HTML/CSS/JS to keep it super lightweight.- WebContainer API and xterm.js: Instead of faking a terminal, I (after much pain) hooked up the WebContainer API so the AI agent has a real, in browser linux environment to run shell commands, install dependencies, and edit local files.- BYOK (Bring Your Own Key): API key ALWAYS stays in localStorage.Whats currently happening:- It works, but it's an alpha. The AI can proactively start projects going properly and edit files, but because I built this over a few days before my exams, a lot of the UI dropdowns and buttons are currently just hardcoded placeholders.- I’m open sourcing it early because I think the foundation of a Vanilla JS + WebContainer IDE is really strong, and I'd love to see where the community takes it while I'm doing my exams.- Live demo: https://opengravity.pages.dev (Zoom out to 80% if not full screen. It will prompt for a gemini api key on load). Start by uploading a folder, then you can fiddle with the terminal and agent, and see how it goes!Would love to hear feedback on the code, the WebContainer integration, or how to improve the agent loop!
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Deep-Dive FAQs
What is OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity?
OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity is analyzed by our AI as: A lightweight, open-source, zero-install IDE clone of Google Antigravity, built with pure Vanilla JS and WebContainer API, offering BYOK for AI agents and custom agent workflows. Addresses usage limits and errors of the original.. It focuses on OpenGravity targets developers seeking a lightweight, customizable, and open-source in-browser IDE, specifically addressing limitations of propriet...
Where did OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity originate?
Data for OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity was aggregated directly from the Hacker News community ecosystem, representing raw developer and early-adopter sentiment.
When was OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity publicly launched?
The initial public indexing or launch date for OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity within our tracked developer communities was recorded on May 12, 2026.
How popular is OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity?
OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity has achieved measurable traction, logging over 62 traction score and facilitating 19 recorded discussions or engagements.
Which technical categories define OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity?
Based on metadata extraction, OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity is categorized under topics such as: Zero-install, BYOK (Bring Your Own Key), vanilla JS, Antigravity clone.
Is OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity recognized by media or academic researchers?
Yes. It has been covered by media outlets like Github.com. This indicates the concept has reached a level of mainstream or scientific viability beyond just developer forums.
What are some commercial alternatives to OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity?
Our semantic intelligence engine identifies potential commercial alternatives in the SaaS space, such as Ferrari Luce, which offers overlapping value propositions.
How does the creator describe OpenGravity – A zero-install, BYOK vanilla JS clone of Antigravity?
The original author or development team describes the product as follows: "Hi. I’m a high school student studying for my GCSEs. I was using Google Antigravity heavily for my side projects, but I kept hitting the usage limits, and getting random "agent terminated" errors. ..."
Community Voice & Feedback
Is there any other editor that comes close to JetBrain's Git integration? All I see is forks of forks of VSCode, and I'm wondering what the incremental gain of yet another does-the-basic-text-editing editors we need. This is in no way directed at OP, but it seems like a lot of wheels spinning around the world and surprisingly little progress at the Pareto limit.
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But... does it clone Antigravity's commitment to storing keys at well known locations on disk in plain text?
I personally don't like antigravity very much, because in some hallucinations the AI ends up removing important parts of your code. It doesn't have a continuous learning engine for your project; if you switch users you may experience problems due to loss of context when reloading the session.
Wow, I can't believe this hit the front page! Its past midnight here in the UK and I have to be up early for GCSEs, so I'm heading to sleep. I'll read and reply to all your comments and questions first thing in the morning! Thank you all so much for the amazing feedback and stars so far.
I wish this could work with your monthly subscription where you get a flat quota in Antigravity with a free account / $20.edit:Is this not built out of VSCode? Isn't Antigravity based on VSCode? VSCodium has a Web build https://github.com/VSCodium/vscodiumUI wise it might be good to make it clearer you don't need to put in an API key to try it.
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Edit: A mod suggested I add in how I actually use this! Right now, its honestly just a massive side project that serves as a fun distraction from my GCSE revision. But I mainly use it to test out quick HTML/CSS/JS ideas in my browser when I get an idea, without needing to boot up a full dev environment or worry about rate limits.
Should've named it ZeroGravity to stay true to its design goals.
Discovery Source
Hacker News Aggregated via automated community intelligence tracking.
Tech Stack Dependencies
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Deep Research & Science
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