Question: I'm looking for a writing assistant that can suggest contextual synonyms and rephrase text to maintain a formal tone.

If you're looking for a writing assistant that offers contextual synonyms and a formal tone, Paperpal is a top contender. This AI-based platform is designed to improve the language, grammar and clarity of your writing, with features like context-aware language suggestions, real-time grammar checks and a paraphraser that maintains a formal tone. It also offers high-quality translations in more than 25 languages and has data security certified under the ISO/IEC 27001:2013 standard.

Another strong contender is Wordvice AI. It offers a range of revision tools, including an AI Paraphraser, AI Translator and AI Plagiarism Checker. The service is geared for researchers, students and content writers, and can be used to improve academic papers, improve grades and accelerate projects. Wordvice AI offers free basic accounts and premium subscriptions, so you can choose the right level of service for your needs.

If you need a high-level paraphrasing and rewording tool, Rephrasely is a good option. It supports more than 100 languages and offers a variety of writing modes to generate paraphrases. Rephrasely also offers plagiarism checks in 50+ languages, making it a good option for people who want to increase productivity while maintaining originality. Rephrasely offers free and premium subscription options depending on your needs.

Last, Ginger is a general-purpose AI-powered writing assistant that also offers advanced grammar and spell checking, context-aware corrections and tools to rephrase and find synonyms. It can be integrated with services like Gmail, Facebook and Microsoft Word, so it can be a good writing tool for individuals and businesses.