Voilà is a broad suite of creation, writing, brainstorming and research tools that can be embedded directly into your browser. It can generate professional content, draft and reply to emails and convert website content. It's free to try, and a basic plan costs $8 per month, making it useful for individuals and teams.
Another top contender is ChatGPT Writer. This tool is geared for drafting emails and messages, with features like grammar checking, rewriting, tone shifting, translation, summarization and brainstorming. It works in multiple languages and can be embedded into Gmail, and it's got strong security protections.
If you want a more general purpose writing assistant, try HIX. It's got more than 120 AI-powered writing tools, including BrowserGPT for integration into Google Docs and Gmail. It's designed to increase productivity and improve the quality of your writing, which makes it useful for writers, marketers and students. Its pricing is flexible, so you can pick the tools you need.