AI · alternatives · 2026
24 alternatives to CosmoDex
World's 1st AI-powered Gamified, competitive Coding Platform
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Prices are shown for the 1 we have checked on their own sites, 1 of them free or with a free tier.
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Hey HN, I'm building Plandex (https://plandex.ai), an open source, terminal-based AI coding engine for complex tasks. I built Plandex because I was tired of copying and pasting code back and forth between ChatGPT and my projects. It can complete tasks that span multiple files and require many steps. It uses the OpenAI API with your API key (support for other models, including Claude, Gemini, and open source models is on the roadmap). You can watch a 2 minute demo here: https://player.vimeo.com/video/926634577 Here's a prompt I used to build the AWS…
2024 · github.com · its alternatives →
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CodeSignal Learn▲148Practice the most in-demand skills with AI tutor, Cosmo
2024 · codesignal.com · its alternatives →
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Codédex v1.0▲272Codédex is a new way to learn to code for kids and adults alike. Journey through the fantasy land of Python, HTML, CSS, or JavaScript, earn experience points (XP) to unlock new regions, and collect all the badges at your own pace. Start your adventure today.
2025 · codedex.io · its alternatives →
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Codebay.ai▲332Learn Python easily with your personalized AI tutor
2024 · codebay.ai · its alternatives →
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Coframe▲367Let your website optimize itself with generative A/B testing
2023 · coframe.com · its alternatives →
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CodenQuest▲282Hello everyone, I've been working on a project called CodenQuest, a coding practice app inspired by platforms like LeetCode, but with a major twist: it's heavily gamified, similar to Duolingo. The main goal is to make coding practice more engaging, especially on mobile. Key Features: - Diverse coding questions with integrated hints and timers. - Code editor with code completion and fill in the blanks questions - Performance statistics (runtime, memory, CPU usage, and more). - Gamified elements: leagues, ranking systems, daily challenges, friends, and streak mechanisms. - Available on iOS and…
2024 · codenquest.com · its alternatives →
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Skillkit▲252It's an open-source project that lets you create, translate, and work with multiple agents at the same time, and more.
Feb 2026 · agenstskills.com · its alternatives →
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Playground▲198We build AI agents to find vulnerabilities in other AI agents. The playground started as an internal tool that we used to test our own offensive agent Nyx. But we realised that hacking an AI is about have as wide a distribution of attacks as possible, especially those which aren't in the distribution of the models. So we are launching playground as a platform to crowdsource agent jailbreaks. And although hacking AI is super fun and we are sure people will do it for free, we want to reward those who help us push forward the offensive frontier of AI. So we are committing $100K in prizes over…
Jul 2026 · playground.fabraix.com · its alternatives →
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robotgame.org is for sale on Spaceship. Secure checkout and quick transfer. See all purchase options. No hidden fees.
2013 · robotgame.org · its alternatives →
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100% free and interactive Python course for beginners - alexmojaki/futurecoder
2020 · github.com · its alternatives →
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CodinGame is a challenge-based training platform for programmers where you can play with the hottest programming topics. Solve games, code AI bots, learn from your peers, have fun.
2017 · tech.io · its alternatives →
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Boxes.devfree tier, from $19/mo▲112Hi HN, we’re Nick and Drew, and we’re building boxes.dev – the first cloud-only agentic dev environment (ADE) that gives every Codex and Claude Code agent its own cloud computer. We’re two engineers who previously built Gem (co-founder/CTO and first hire), and we spent the last year coding almost exclusively using Codex and Claude Code. It’s been a huge change to how we code, and it’s been exhilarating seeing the models keep getting better – but we eventually realized that developing on localhost was holding us back: - Git worktrees are clunky to set up and use for parallelizing work -…
Jun 2026 · boxes.dev · its alternatives →
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A free coding platform with AI assistance & gamification!
2025 · its alternatives →
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CodeBattle▲76Truly collaborative coding platform for the next Gen
2023 · codebattle.in · its alternatives →
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CodingCanvas▲13AI-powered challenges to ace your interviews
2025 · codingcanvas.io · its alternatives →
- 20IB
I created vibescaffold.dev. It is a wizard-style AI tool that will guide you from idea → vision → tech spec → implementation plan. It will generate all the documents necessary for AI coding agents to understand & iteratively execute on your vision. How it works: - Step 1: Define your product vision and MVP - Step 2: AI helps create technical architecture and data models - Step 3: Generate a staged development plan - Step 4: Create an AGENTS.md for automated workflows I've used AI coding tools for awhile. Before this workflow (and now, this tool), I kept getting "close but not quite" results…
Nov 2025 · vibescaffold.dev · its alternatives →
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Most games have limits. You can only use preset features, need coding for customization & adding mods, require expensive extra devices. We wanted to remove those barriers. That’s why we are building space zero—a browser based 3D world powered by AI. We plan to build players can freely mix items to generate unexpected creations with unique properties and sounds. Also the world itself is dynamically generated, evolving endlessly. I uploaded a demo version I’ve been working on for the past month! I hope to get any feedbacks or comments :)
2025 · 0.space · its alternatives →
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The Future of Learning - AI-Native Educational Platform!
2024 · codekidz.ai · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →