Best for JavaScript

Aider

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Open-source terminal pair programmer with git-native workflows

Aider is an open-source AI pair programming tool that runs in the terminal and keeps your workflow inside git. It can automatically create commits, apply diff-based edits across multiple files, and map your repository for large projects. Aider is model-flexible: you can use current OpenAI, Anthropic, Google, DeepSeek, and local model stacks through direct APIs, OpenRouter, Ollama, or compatible endpoints.

• ●Automatic git commits with descriptive messages
• ●Diff-based, multi-file editing directly in the terminal
• ●Works with current frontier model families (OpenAI, Anthropic, Gemini) plus DeepSeek and local models

Amazon Q Developer

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Agentic AWS-aware coding assistant with IDE, CLI, and console coverage

Amazon Q Developer (formerly CodeWhisperer) is AWS’s generative AI assistant for coding, application upgrades, and cloud operations. It provides agentic chat in IDEs, the AWS Console, chat apps, and the CLI (upgradeable to the Kiro CLI) to accelerate coding, run secure code scans and tests, and transform Java/.NET applications with guided upgrade workflows. The perpetual Free tier includes 50 agentic requests and 1,000 lines of code transformations per month; Pro is $19/user/month with higher limits, pooled upgrade quotas, admin controls, and IP indemnity.

• ●Agentic chat and coding in IDEs with inline suggestions and repository-aware context
• ●CLI command completions and agentic workflows (Q Developer CLI users can upgrade to Kiro CLI)
• ●AWS Console assistant for troubleshooting, cost optimization, and architecture guidance

Bito AI

AI code completions, reviews, and chat for VS Code and JetBrains

Bito is an AI-powered coding assistant that provides code completions, agentic code reviews, and chat for developers. It offers intelligent autocompletions with multiple suggestions, codebase-aware reviews in pull requests and IDEs, and a versatile chat interface. Bito supports over 35 languages including Python, JavaScript, C++, Go, and SQL. It includes comment-driven coding where you describe functionality in comments and Bito generates code options. Bito is available as an extension for VS Code and JetBrains IDEs, with end-to-end encryption, no code storage or model training, and SOC 2 Type II certification.

• ●AI code completions with multiple suggestions
• ●Agentic code reviews in PRs and IDEs
• ●Codebase-aware review with custom rules

Blackbox AI

AI code completion and autonomous coding agent for developers

Blackbox AI is an AI coding assistant that provides code completion, generation, and autonomous agent capabilities. It integrates with VS Code and offers code autocomplete across many languages, code generation, explanation, and commit message suggestions. Blackbox can run as a coding agent that builds, tests, and deploys code, with support for browser, VS Code, CLI, IDE, and desktop interfaces. It provides access to many AI models for chat, code, and related tasks.

• ●Code completion and autocomplete across many languages
• ●Code generation, explanation, and improvement suggestions
• ●Commit message generation

Bolt.new

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AI web and app builder with tokens-based plans, hosting, and databases

Bolt.new is an AI-powered builder from StackBlitz that generates and edits production-grade web/apps in the browser. It provides hosted previews, databases, auth, custom domains, and team controls. Pricing is token-based: Free (300K/day, 1M/month), Pro (starts at 10M/month), Teams ($30/member/month), and Enterprise with SSO/audit/security. Built on WebContainers with live previews and deploys via Bolt Cloud.

• ●Generate and iteratively edit apps/sites with AI in the browser
• ●WebContainers-based workspace with live preview and package management
• ●Hosting, databases, auth, SEO, and custom domains via Bolt Cloud

Anthropic Claude API

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Build with Claude Opus 4.6, Sonnet 4.6, and Haiku via the Anthropic API with MCP and adaptive thinking

The Anthropic Claude API provides pay-per-use access to the full Claude model lineup: Opus 4.6 (released Feb 5, 2026) for highest-depth reasoning at $5/$25 per MTok, Sonnet 4.6 (Feb 17, 2026) as the balanced default at $3/$15, and Haiku 4.5 for speed-optimized budget workloads at $1/$5. The API supports the Model Context Protocol (MCP) with 75+ enterprise connectors, adaptive thinking for extended reasoning, context compaction for efficient long conversations, tool use, prompt caching (write/read discounts), batch processing (50% savings), and deployment across Anthropic, AWS Bedrock, Google Vertex AI, and Azure AI Foundry.

• ●Claude model lineup: Opus 4.6 ($5/$25), Sonnet 4.6 ($3/$15), Haiku 4.5 ($1/$5)
• ●Model Context Protocol (MCP): open standard with 75+ enterprise connectors
• ●Adaptive thinking: extended reasoning mode for complex problem-solving

Google Gemini API

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Access Gemini 3 Flash (~78% SWE-bench at $0.50/$3), 3.1 Pro, and the full Gemini model family

The Gemini API exposes Google's full model lineup including Gemini 3 Flash (~78% SWE-bench at $0.50/$3 per MTok, the best price-performance coding model available), Gemini 3.1 Pro Preview (released Feb 19, 2026, at $2/$12), Gemini 2.5 Pro ($1.25/$10), and Gemini 2.5 Flash ($0.30/$2.50). All models support 1M token context windows, multimodal inputs (text, image, audio, video), and tools including function calling, code execution, Google Search grounding ($14 per 1K queries), URL context, and computer use. Google AI Studio provides free prototyping with Build Mode for rapid app development.

• ●Gemini 3 Flash: ~78% SWE-bench at $0.50/$3 per MTok (best price-performance)
• ●Gemini 3.1 Pro Preview: latest flagship (Feb 19, 2026)
• ●1M token context windows across all models (largest in the industry)

GitHub Copilot

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AI pair programmer built into GitHub and popular IDEs

GitHub Copilot delivers inline completions, chat, and pull request assistance with GitHub-native context across VS Code, Visual Studio, JetBrains IDEs, Neovim, GitHub.com, and Copilot CLI. Current plans include a free tier plus premium-request allowances on paid plans, with access to newer model families based on subscription level.

• ●Inline code completion in supported IDEs
• ●Copilot Chat with codebase and repository context
• ●Pull request summaries and code review assistance

Gemini Code Assist

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Google's AI coding assistant with Agent Mode, 1M token context, MCP support, and free individual tier

Gemini Code Assist is Google's AI coding assistant for VS Code and JetBrains IDEs. It features Agent Mode (launched July 2025) for autonomous multi-step coding within the IDE, 1M token context for understanding entire codebases, and MCP support for connecting to external tools. The free individual tier offers 6,000 code requests and 240 chat requests per day. Individual Pro pricing is $19.99/month, with Enterprise plans at $19/user/month through Google Cloud for governance, customization, and IP indemnification.

• ●Agent Mode (July 2025): autonomous multi-step coding within the IDE
• ●1M token context window for understanding entire codebases
• ●MCP support for connecting to external tools and data sources

JetBrains AI Assistant

Integrated AI coding assistance for JetBrains IDEs and VS Code

JetBrains AI Assistant brings AI-powered code completion, chat, and editing to JetBrains IDEs and, in preview, to VS Code. It supports cloud models like GPT-4.1, Claude 3.7 Sonnet, and Gemini 2.5 Pro, with improved RAG-based context and multi-file editing from chat. A free tier includes unlimited completion and local model support with limited cloud quotas. JetBrains AI Assistant also supports the Agent Client Protocol for bringing your own AI agents, and offers image attachments in chat for supported models.

• ●Code completion with multiline support for Java and C++
• ●AI chat with codebase context and image attachments
• ●Multi-file editing directly from chat

LangChain

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Open-source framework for LLM apps with LangSmith observability

LangChain is an open-source framework for building LLM apps with composable chains, agents, tools, and RAG. It supports Python and TypeScript, integrates with major model providers and vector stores, and pairs with LangSmith for tracing, monitoring, and evals.

• ●Composable chains for multi-step workflows
• ●Agent framework with tool use
• ●RAG (Retrieval Augmented Generation)

Lovable

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Chat-based app builder with remixable templates and hosted previews

Lovable (formerly GPT Engineer) lets you build and remix web apps through chat and templates, then preview and deploy from the browser. A gallery of user-built projects showcases remix counts; pricing is not publicly listed, and users join via sign-in to start building.

• ●Build apps through chat with code generation
• ●Remixable templates and gallery
• ●Hosted previews and deployments

Firebase Studio (formerly Project IDX)

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Firebase Studio cloud IDE with Gemini-assisted development

Project IDX has been folded into Firebase Studio, an agentic browser IDE with Gemini in Firebase for coding, debugging, testing, and refactoring. The preview is no-cost with 3 workspaces per user; Google Developer Program members get 10 (Standard) or 30 (Premium). App Prototyping and Code Assist agents, built-in previews/emulators, Git imports, and App Hosting deployments are included; some Firebase services bill separately once linked to Cloud Billing.

• ●Agentic browser workspace with Gemini in Firebase chat and code actions
• ●App Prototyping agent to scaffold apps from text, sketches, or templates
• ●Import from GitHub/GitLab/Bitbucket or local; customize via Nix

Replit

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AI-first cloud IDE with Replit Agent, Core/Teams credits, and one-click app hosting

Replit is a browser-based IDE with Replit Agent for autonomous edits, chat, and code generation. Core and Teams plans bundle monthly credits for compute, databases, and AI. Build and deploy full-stack apps with connectors, auth, storage, and security scanning straight from the workspace—no setup required.

• ●Browser-based workspace with app hosting, DB, auth, storage, and security scanner
• ●Replit Agent for autonomous edits, chat, tests, and deploys
• ●One-click publish with bundled credits for compute and bandwidth

Sweep AI

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Open-source GitHub app that plans fixes and opens pull requests

Sweep AI reads your repo, plans changes from GitHub issues, and opens pull requests for review. It focuses on maintenance, bug fixes, refactors, and small feature requests, with self-hosting via the open-source repo and paid cloud options available through the vendor.

• ●Automated pull request generation from GitHub issues
• ●Plans changes and applies diffs
• ●Handles maintenance, bug fixes, and small features

Tabnine

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Private AI coding assistant with free, pro, enterprise, and agentic tiers

Tabnine is an AI coding platform focused on privacy-first enterprise adoption with IDE completions, chat agents, and private deployment options (SaaS, VPC, on-prem, and air-gapped). Current public plans include Basic (free), Pro, Enterprise, and Agentic Platform, with support for organization-level controls, secure model routing, and customer-selected model providers.

• ●AI code completions and chat across major IDEs
• ●Workflow agents for tests, Jira tasks, and code review
• ●Org-aware context from Git, docs, Jira, and Confluence

v0

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Generative UI builder with credits-based plans, Vercel deploys, and v0 Agent API

v0 by Vercel generates and edits React UIs from prompts with Tailwind/shadcn patterns, design mode, Figma import, GitHub sync, and one-click deploys to Vercel. Pricing is credits-based: Free ($5 monthly credits, 7 messages/day), Premium $20 with more credits and larger attachments, Team $30/user, Business $80/user with training opt-out, and Enterprise with SAML/SLAs. The v0 Agent API offers v0 Agent and v0-1.5 models with per-token pricing.

• ●Generate and refine React UIs from prompts
• ●Tailwind + shadcn patterns with responsive defaults
• ●Design Mode visual editing and GitHub sync

Vercel AI SDK

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Open-source TypeScript toolkit for streaming LLM apps with providers, tools, and generative UI

Vercel AI SDK (v6 beta) is a free, open-source toolkit for building streaming AI apps across Next.js, React, Vue/Nuxt, SvelteKit, and Node/Edge runtimes. It provides a unified provider API, tool calling, structured outputs (`generateObject`), server actions/RSC hooks, and generative UI helpers like `streamUI`, with adapters for OpenAI, Anthropic, Google, Mistral, Ollama, and more.

• ●Unified provider API with adapters for OpenAI/Anthropic/Google/Mistral/Ollama and more
• ●Streaming text, chat, and tool calls with React/Next server actions and RSC hooks
• ●Structured outputs via `generateObject` with schema validation

Windsurf

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AI-native IDE with Cascade agents and SWE model family

Windsurf is an AI-native IDE with Cascade agent workflows, Fast Context retrieval, and multi-file codebase operations. Following Cognition's 2025 acquisition of Windsurf/Codeium, the product remains focused on SWE-1.5/SWE-1 model-assisted development plus BYOK provider support (OpenAI, Anthropic, Google, xAI) for enterprise and individual teams.

• ●Cascade agentic chat for conversational coding
• ●Codebase indexing for personalized suggestions
• ●AI Codemaps for visual codebase exploration