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AI assistants are chat apps that answer questions, reason through problems and work with files, images and the web. This list gathers the ones GenGrades has written up, each page with its prices, limits and sourced facts.
我们在“AI 助手”下评过的所有工具和模型，按总分从高到低。
Character.AI 是 Character Technologies 开发的聊天应用，用户可以和其他人创建的角色对话。公司于 2026 年 10 月 12 日申请第 11 章破产保护，迪士尼出价 2000 万美元取得部分资产的授权；出售期间应用照常运行，如果没有出价能让它继续运营，平台将关闭。
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Duck.ai 是 DuckDuckGo 推出的隐私 AI 聊天，2024 年 6 月以 DuckDuckGo AI Chat 的名字上线。不用注册就能使用 OpenAI、Anthropic、Mistral 等公司的模型，DuckDuckGo 会在每次请求前去掉你的 IP 地址。6 个模型免费，更强的模型要订阅 DuckDuckGo 每月 9.99 或 19.99 美元的套餐。
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Gemini Notebook 是谷歌的研究笔记本，根据你添加的资料回答问题，并把资料做成音频、视频、报告和测验。谷歌在 2026 年 7 月 16 日把它从 NotebookLM 改名而来：仍是同一个独立产品，原有笔记本全部保留，notebooklm.google.com 现在会跳转到 notebook.google.com。
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Grok 是 SpaceXSI 的聊天机器人，这家马斯克旗下公司原名 xAI，后改名 SpaceXAI，2026 年 10 月 13 日起 Grok 并入 X Subscription 出售。2026 年 1 月以来，Grok 因性化深度伪造内容遭多国封锁、调查和起诉，加拿大隐私专员在 2026 年 6 月认定 X Corp. 和 xAI 违反联邦隐私法。
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小米 MiMo 是小米自研的 AI 大模型系列和开放平台：网页版 MiMo AI Studio 对话、兼容 OpenAI 和 Anthropic 的 API、语音模型，以及编程和桌面智能体。2026 年 9 月 22 日以 MIT 协议开源的 MiMo-V2.6-Pro，截至 10 月 17 日是 Artificial Analysis 智能指数上得分最高的开放权重模型。
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先给结论，再讲原因、例子、限制和下一步。
An AI assistant here is a general chat app or model platform people use day to day for questions, research and files, such as Grok, Duck.ai or Gemini Notebook. Coding agents and agents that act for you have their own lists.
Entries with a GenGrades score come first, highest total first; the rest follow in alphabetical order. Each one links to its full page.
Every fact on a tool page carries its source and the date it was checked: the maker's own pages and terms, public tests and user reports.
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VideoEnhancer is a web tool that upscales short MP4 clips to 1080p, 2K or 4K with the FlashVSR model and also compresses, face-swaps and generates video. After a 5-second free trial, 1080p costs 3 credits a second, $0.03 to $0.09 depending on how credits are bought. VideoEnhancer is our own product: it is made by the team behind GenGrades.
LayerGrab splits a flat image into up to 16 named, transparent layers over a filled-in background, on the web, in Figma or in Chrome, or pulls out only what you name. Each layer costs $0.10 on its $12 plan, $0.08 on Premium. No independent review exists yet. LayerGrab is our own product: it is made by the team behind GenGrades.
VideoTextRemover is a web tool that erases burned-in subtitles, captions and other on-screen text from MP4 and MOV videos and repaints what was behind them, up to 1080p. It bills per second processed, about $0.025 to $0.049, with 30 free seconds a month in some countries. VideoTextRemover is our own product: it is made by the team behind GenGrades.
MagicRemover is a browser tool that erases people, objects, text, logos and watermarks from photos, and subtitles from videos. Photos get 2 free removals a day, 2 more after sign-in, at about 1 megapixel; beyond that, credits start at $9.90 for 330. MagicRemover is our own product: it is made by the team behind GenGrades.