Best for JavaScript

Aider

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Open-source terminal pair programmer with git-native workflows

Aider (v0.86.1) is an open-source AI pair programming tool that runs in the terminal and keeps your workflow inside git. It can automatically create sensible commits, apply diff-based edits across multiple files, and map your repository to work on large projects. Aider works best with Claude 3.7 Sonnet, DeepSeek R1/V3, OpenAI GPT-4.1 and o3/o4-mini, and Gemini 2.5 Pro, while also supporting many other cloud and local models (via OpenRouter, Ollama, and direct API keys).

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.

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.

Anthropic Claude API

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Build with Claude Opus 4.5, Sonnet 4.5, and Haiku 4.5 via the Anthropic API

The Anthropic Claude API provides pay-per-use access to Claude’s latest models: Opus 4.5 ($5/$25 MTok), Sonnet 4.5 ($3/$15 MTok for ≤200K prompts; $6/$22.5 MTok for >200K prompts), and Haiku 4.5 ($1/$5 MTok). The API supports 200K-token contexts, tool use/function calling, prompt caching (write/read discounts), and batch processing (50% savings). Available through the Claude Developer Platform with official SDKs, plus partner access on Amazon Bedrock, Google Cloud Vertex AI, and Microsoft Foundry.

GitHub Copilot

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AI pair programmer built into GitHub and popular IDEs

GitHub Copilot delivers inline code completions, chat, and pull request assistance powered by OpenAI GPT-4-class models with GitHub-native context. It works in VS Code, Visual Studio, JetBrains IDEs, Neovim, GitHub.com, and the Copilot CLI. Individuals get a 30-day free trial, and verified students, teachers, and maintainers can use Copilot for free; paid plans cover individuals, businesses, and enterprises.

Gemini Code Assist

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Google Cloud's AI coding assistant with 1M-context and terminal agent

Gemini Code Assist (formerly Duet AI) is Google Cloud's AI coding assistant for teams. Standard and Enterprise licenses bring Gemini models with a 1M-token context window to IDEs and the terminal, plus optional agent mode. Enterprise adds private code customization, expanded Google Cloud integrations, and preview access to new Gemini models via release channels.

LangChain & LangGraph

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LangChain for LLM apps; LangGraph for stateful graph agents

LangChain provides provider-agnostic LLM tooling, while LangGraph adds a graph-based runtime for controllable, stateful agents with human-in-the-loop, persistence, and streaming. Both are open source with Python/JS SDKs and a growing ecosystem of integrations and middleware.

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.

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.

Project IDX (now Firebase Studio)

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Firebase Studio: agentic cloud IDE with Gemini in Firebase and free workspaces

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.

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.

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.

Tabnine

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Agentic AI coding platform with private deployment and org-native context

Tabnine is an enterprise AI coding platform that delivers completions, chat, and workflow agents with strict privacy. It supports SaaS, VPC, on-prem, and air-gapped deployments, plugs into MCP tools (Git, tests, Jira, Confluence, databases), and can run customer-selected LLMs. Pricing is $59/user/month on annual contracts, with Tabnine-provided LLM usage billed at provider rates plus a 5% handling fee.

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.

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.

Windsurf

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AI-native IDE from Codeium with SWE-1.5 and Fast Context

Windsurf is an AI IDE from Codeium (Exafunction) that combines the Windsurf Editor, Cascade agentic chat, and Fast Context retrieval to work across large codebases. It ships Codeium’s own SWE-1.5 fast agentic model and SWE-1, plus BYOK access to major providers (OpenAI, Anthropic Claude, Google Gemini, xAI) inside the editor. Features include AI Codemaps for visual navigation, deep multi-file understanding, and enterprise controls for teams.