最佳免费 AI 工具
您不需要花任何钱就可以开始使用强大的 AI 工具。以下是真正免费的最佳选择——不是附带细则的试用版，而是免费版确实可以持续使用的实用工具。
快速推荐
ChatGPT 和 Claude 是两款最好的免费通用 AI 助手。Grammarly 的免费版能很好地处理基本语法问题。Codeium 提供无限制的免费 AI 代码补全。Stable Diffusion 是完全免费的开源图像生成工具。
精选推荐
按免费版的实际实用程度排名——不仅仅是有没有免费版。
如何选择
对于日常 AI 辅助（写作、头脑风暴、回答问题），从 ChatGPT 或 Claude 开始——两者都有丰富的免费版。对于特定任务：Grammarly 用于提升写作质量，Codeium 用于代码补全，Stable Diffusion 用于图像生成，Semantic Scholar 用于学术研究。
免费版和付费版的主要区别通常是使用限制和对最强模型的访问权限。对于大多数个人用户来说，免费版已经足够。
常见问题
免费 AI 工具真的好用吗？ 是的。ChatGPT 和 Claude 的免费版使用的是性能出色的模型。Grammarly 的免费版能捕捉大多数常见错误。Codeium 提供无限制补全。免费不等于低质量。
免费版有什么限制？ 通常包括：较低的每日使用限额、只能使用稍旧的模型（而非最新旗舰版）、以及较少的高级功能（如文件上传或更长的对话）。
什么时候应该升级到付费方案？ 当您经常触达使用限制、需要在高峰期优先访问，或需要更大上下文窗口、文件分析或团队协作等高级功能时。
披露
本页面上的部分链接可能是联盟链接。我们特别推荐免费选项，因为它们无需付费即可提供真正的价值。
精选推荐
ChatGPT
OpenAI's flagship AI assistant for writing, analysis, coding, research, voice, images, and agent-style task execution across web and mobile.
- Strong balance of usability, reasoning, and multimodal features
- Mature product across web, desktop, and mobile
Claude
Anthropic's general AI assistant for writing, research, analysis, and coding, with a strong reputation for thoughtful long-form output.
- Excellent long-form writing and synthesis
- Strong product polish
Grammarly
优惠The most widely used AI writing assistant, offering real-time grammar, spelling, tone, and clarity suggestions across virtually any text field via browser extensions, desktop apps, and mobile keyboards. Its generative AI features now handle full rewrites and drafting.
- Works inline across Gmail, Google Docs, Slack, and hundreds of other apps
- Free tier is genuinely useful for catching basic errors
Codeium
Free AI code completion tool that provides fast inline suggestions, chat, and search across all major IDEs without requiring a paid subscription.
- Generous free tier with unlimited code completions for individuals
- Supports over 70 programming languages across 40+ IDEs
Stable Diffusion
Open-source AI image generation model that can be run locally or through hosted services, offering full control over the generation process with no per-image costs.
- Fully open-source with no vendor lock-in
- Massive community ecosystem of fine-tuned models, LoRAs, and extensions
Semantic Scholar
Free AI-powered academic search engine from the Allen Institute for AI that helps researchers find and understand scientific literature through semantic understanding and citation analysis.
- Entirely free with no paywalls or subscription required
- Indexes over 200 million papers across all scientific fields
快速对比
| 工具 | 定价 | 免费版 | 评分 | 最适合 |
|---|---|---|---|---|
| ChatGPT | Free plan available. Plus: $20/month. Pro: $200/month. Team starts at $25/user/month billed annually. | 是 | 91 | General users who want one assistant for writing, analysis, and research, Teams that need a polished chat interface plus higher-tier business controls |
| Claude | Free plan available. Pro is $20/month monthly or $17/month billed annually. Team starts at $25/user/month billed annually. | 是 | 89 | Users who value clean writing and strong reasoning, Teams wanting projects, knowledge bases, and connectors |
| Grammarly | Free plan with basic grammar and spelling checks. Premium at $12/month (annual) or $30/month (monthly) adds tone, clarity, full-sentence rewrites, and plagiarism detection. Business at $15/user/month with style guides, brand tones, and admin controls. | 是 | 80 | professionals writing emails and business documents, students improving academic writing |
| Codeium | Free plan with unlimited completions for individual developers. Teams plan at $12/user/month. Enterprise plan with custom pricing. | 是 | 76 | individual developers who want quality AI completions without paying, students and hobbyists learning to code with AI assistance |
| Stable Diffusion | Free to download and self-host. Stability AI API from $0.01 per image. Third-party hosted services like DreamStudio offer pay-as-you-go credits. | 是 | 80 | developers and researchers who want full control over the model, artists building custom fine-tuned models for specific styles |
| Semantic Scholar | Completely free to use. API access is also free with rate limits. | 是 | 78 | researchers exploring citation networks and paper influence, academics finding relevant papers using natural language queries |
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