Alternatives to Discontinued Cloud9 IDE

historical guide · 4 editor-selected alternatives · Cloud9 IDE overview →

source: tools.alternatives · stored order · active records only; review scores are annotations and never change membership or order

A directional evidence panel appears only when the substitute rationale, trade-offs, sources, and verification date have been recorded. Older selections without that panel remain visible but are unclassified under the new evidence contract.

discontinued Cloud9’s standalone c9.io era ended after the AWS acquisition, and AWS Cloud9 itself is now a legacy service. AWS documentation states that Cloud9 is no longer available to new customers, while existing customers can continue to use it as normal. The practical replacement path is migration to current AWS developer tools or modern cloud IDEs rather than a revived Cloud9 product.

GitHub Codespaces

85/100freemiumexplicit relation

GitHub Codespaces is a cloud-hosted development environment that spins up a full VS Code workspace in a dev container directly from any GitHub repo. Configurable via devcontainer.json, prebuilt for fast cold starts, and accessible through the browser or local VS Code. Used by teams that want zero-setup onboarding, consistent environments, and reproducible builds across platforms.

Freemium cloud-hosted development environment platform. Free tier provides 60 core-hours of compute and 15 GB of storage per month for GitHub Free accounts ($0/mo), and 90 core-hours + 20 GB storage for GitHub Pro accounts. Overage and pay-as-you-go compute is billed per core-hour: 2-core ($0.18/hr), 4-core ($0.36/hr), 8-core ($0.72/hr), 16-core ($1.44/hr), and 32-core ($2.88/hr). Storage is billed at $0.07/GB/month for active and stopped environments. Spending limits can be set to $0 to prevent accidental billing.Review →

Gitpod

82/100freemiumexplicit relation

Ona (formerly Gitpod, acquired by OpenAI) is an agentic software development and cloud development environment platform that orchestrates projects, ephemeral workspaces, and autonomous engineering agents.

Freemium cloud development environment (CDE) platform offering 50 free workspace hours per month on the Free plan ($0/mo). Pay-as-you-go compute is billed at ~$0.36/hour for standard 4-core/8GB workspaces with automated scale-to-zero idle timeouts. Enterprise Dedicated tier provides single-tenant hosting inside private customer VPCs (AWS, GCP, Azure), SAML/SSO authentication, custom SLAs, and organization-wide governance via custom quotes.Review →

StackBlitz

85/100freemiumexplicit relation

StackBlitz is a browser-based development environment powered by WebContainers — a WebAssembly micro-OS that runs Node.js natively inside the browser. Boot full-stack Next.js, Vite, Angular, or Astro apps in milliseconds with no remote VM, share live via URL, and embed interactive code examples in docs. Also the home of Bolt.new, StackBlitz's AI full-stack app builder.

Browser-based full-stack IDE powered by WebContainers. Personal Free plan provides $0/mo for unlimited public projects, instant Node.js execution, and GitHub integration. Pro tier ($8–$18/mo billed annually, or $25/mo monthly) unlocks unlimited private projects, unlimited file uploads, and local backend connectivity. Teams tier ($55–$60/member/month) adds private repo collaboration and private NPM registries. Enterprise tier offers custom quote-based pricing for self-hosted/VPC deployment, WebContainer API access, SAML SSO, SOC 2 Type II compliance, and dedicated 24/7 SLA support.Review →

Replit

81/100freemiumexplicit relation

Browser-based IDE and cloud platform with a built-in AI agent that builds full-stack applications from natural language prompts. Supports 50+ languages with instant hosting, multiplayer collaboration, built-in databases (PostgreSQL, key-value), secrets management, and one-click deployment. Used by 30M+ developers for prototyping, learning, and shipping apps. Features Ghostwriter AI for code completion. Popular for hackathons, education, and rapid MVP development.

Replit offers a free Starter tier with basic compute and daily AI agent credits. Replit Core starts at $25/month ($20/month billed annually) including $25 in monthly AI credits and autonomous agent builds. Replit Pro is priced at $100/month ($95/month billed annually) with $100 monthly credits, high-spec compute, and up to 15 team collaborators, while Enterprise offers custom pricing with SAML SSO, dedicated infrastructure, and advanced governance.Review →

Free Cloud9 IDE alternatives

GitHub Codespaces, Gitpod, StackBlitz, Replit offer a free plan or free tier.

More IDEs & Code Editors tools

same category, not editor-selected alternatives — see how Cloud9 IDE compares →

CursorAI-first code editor built as a VS Code fork that deeply integrates LLMs into every part of the development workflow. Features Tab autocomplete with multi-line predictions, Cmd+K inline editing, AI chat with full codebase awareness, and Agent mode for autonomous multi-file edits with terminal execution. Supports GPT-4, Claude, and more with automatic context from project files and docs. Includes privacy mode for SOC 2 compliance. The leading AI-native IDE with 100K+ paying users.VS CodeMicrosoft's free, open-source code editor that has become the most widely used development environment in the world. Lightweight but powerful, with built-in Git, integrated terminal, IntelliSense, debugger, and tens of thousands of extensions. Recent updates add Agent mode for delegating coding tasks to AI, Model Context Protocol (MCP) support, and Next Edit Suggestions. Native GitHub Copilot, remote development via SSH/containers/WSL, and a browser version at vscode.dev.Google AntigravityGoogle Antigravity is Google's AI-powered agentic development platform, announced in November 2025 and expanded with Antigravity 2.0 at I/O 2026, that places autonomous AI agents at the center of software development. Distributed as both a VS Code-based desktop app and the new Antigravity CLI, it runs planning, implementation, and verification agents — backed by Gemini 3.1 Pro/Flash, Claude Sonnet/Opus 4.6, and GPT-OSS 120B — across editor, terminal, and browser.JunieJunie is JetBrains’ AI coding agent for autonomous task execution inside JetBrains IDEs and Android Studio. It helps plan implementation steps, write and inspect code, run tests, and collaborate through code and ask modes. Current JetBrains AI positioning lists Claude, GPT, Gemini, Grok, local-model options, and provider-choice paths, with AI Ultimate recommended for regular Junie usage.TabbyTabby is an open-source, self-hosted AI coding assistant that serves as a privacy-focused alternative to GitHub Copilot. It provides code completion, chat-based coding assistance, and IDE integrations while running entirely on your own infrastructure with support for consumer-grade GPUs. Tabby supports multiple LLM backends and offers extensions for VS Code, JetBrains, Vim, and other editors, giving teams full control over their AI coding tools without sending code to external services.ZedHigh-performance code editor built entirely in Rust by the creators of Atom and Tree-sitter. GPU-accelerated rendering and a multicore architecture deliver 10x faster startup and 75% lower memory use than Electron editors like VS Code. Native real-time collaboration that works like Google Docs, deeply integrated AI with agentic editing (Claude and more), and Tree-sitter-powered syntax highlighting. Direct-to-display rendering on macOS. Available on macOS, Linux, and Windows.CodeSandboxCloud-based development environment providing instant sandboxes for web projects with live collaboration. Features branching like Git for dev environments, shareable previews, and deep integration with GitHub. Ideal for rapid prototyping, code reviews, and onboarding new team members who need a ready-to-go development environment without local setup or configuration delays.EmdashOpen-source agentic development environment for running multiple coding agents in parallel using isolated Git worktrees.KiroSpec-driven agentic AI IDE from AWS, built on Code OSS (the VS Code foundation), that transforms ad-hoc prompting into a structured workflow by auto-generating requirements documents, design specs, and implementation plans before writing code. Kiro keeps AI-written code tied to explicit acceptance criteria defined up front.

FAQ

Which Cloud9 IDE alternative is listed first?

GitHub Codespaces is first in the editor-selected list of 4 Cloud9 IDE alternatives and carries an editorial review score of 85/100. The stored order is editorial; review scores do not determine membership or position.

Are there free Cloud9 IDE alternatives?

Yes — GitHub Codespaces, Gitpod, StackBlitz, and more offer a free plan or free tier.

What should I use instead of Cloud9 IDE?

Cloud9 IDE has been discontinued — Cloud9’s standalone c9.io era ended after the AWS acquisition, and AWS Cloud9 itself is now a legacy service. AWS documentation states that Cloud9 is no longer available to new customers, while existing customers can continue to use it as normal. The practical replacement path is migration to current AWS developer tools or modern cloud IDEs rather than a revived Cloud9 product. The first editor-selected replacements are GitHub Codespaces, Gitpod, StackBlitz.