Question: Is there an offline grammar and spell checker that doesn't require a subscription or internet connection?

If you want an offline grammar and spell checker that doesn't need a subscription or network connection, GrammarBot is a good choice. The AI-powered app downloads a copy of a large language model that you can use to check grammar and spelling even when you're not connected to a network. It runs on MacOS machines with M1, M2 or M3 processors and requires 8GB or more of RAM. The Personal License costs $12, including lifetime use, one year of updates and email support. The company plans to add support for Windows and Linux in the future.

Another tool worth considering is Paperpal, which offers more features than just grammar and spell checking. It also offers context-sensitive language suggestions, plagiarism detection and real-time grammar checking. Paperpal works well with MS Word, both online and offline, so it's a good choice for academic writing. Although it offers a free version with some limits, its full feature set and data security certifications make it a good choice for power users.

For a broader range of writing tasks, GrammarBot offers other tools like message rewriting and style changes. It supports multiple languages and has a translation feature, too, so it's good for personal and professional use. The tool can help you communicate more clearly and effectively, adapting the tone of your messages for different audiences.