If you're looking for a powerful grammar and spellchecking tool that can help you as you write, LanguageTool is a great option. This AI-powered language checker works with more than 30 languages and offers features like grammar checking, tone suggestions and paraphrasing. It can be used in conjunction with a variety of writing tools like browser extensions, email extensions and office plugins. LanguageTool also offers a standalone app for macOS, Windows and iOS. It's available in a free version with limited features and a premium version with more advanced tools, making it useful for both solo writers and teams.
Another option is Trinka, which is geared specifically for academic and technical writing. Trinka checks grammar, but also word choice, usage and style. It also has tools for detecting plagiarism and paraphrasing that preserve the original meaning. Trinka is geared for academic writers, with features like a proofread file function, consistency check and citation checker. It can be used through integrations with MS Word, Google Chrome, Mozilla Firefox, Microsoft Edge and Safari Browser.
For a general-purpose writing assistant, you might want to try GrammarBot. In addition to grammar and spelling checks, it can rewrite messages and transform writing styles to match different tones and audiences. GrammarBot supports multiple languages and has a translation feature, so it can be used for personal and professional writing.
Last, PaperRater offers immediate feedback and suggestions to improve your writing. It's got a powerful proofreading engine, a plagiarism detector and writing tips. PaperRater offers immediate analysis and automated scoring, with both free and premium versions available. The free version covers the basics, but the premium version offers more tools, like the ability to upload files and faster processing.