First up is Samwell AI, which is designed to help students write academic essays quickly while preserving academic integrity. It's got a range of features, including the ability to generate essays of varying lengths, support for multiple citation styles, and citation checking for errors. It also has tools for non-plagiarized content, guided papers and personalized research connections. With a free tier and flexible pricing, Samwell AI is a good option for whatever academic writing needs you might have.
Another good option is Paperpal, which is geared more toward improving language, grammar and writing clarity. It's got context-sensitive language suggestions, a plagiarism detector that's designed to be more accurate than traditional algorithms, grammar checking as you type, and a paraphraser that's designed to maintain a formal tone. Paperpal works online or offline through MS Word integration, so you can use it at any stage of writing, and it's got ISO/IEC 27001:2013 certification for data security.
For a more general-purpose writing assistant, you might like Trinka. It's designed to improve academic and technical writing with editing and proofreading designed to improve clarity, concision and impact. It's got a grammar checker, paraphraser, plagiarism checker and citation checker, as well as a proofread file function and a LaTeX proofreader. Trinka also has enterprise-level options and integration with browsers and word processors like Google Docs, MS Word and LibreOffice.
Last is Yomu, which promises intelligent help with academic writing with tools like AI autocomplete, editing, citation tools, plagiarism detection and grammar improvements. It's geared for students and researchers, covering all aspects of academic writing and with pricing tiers for different levels of use. Yomu's product roadmap includes multilingual support and better grammar correction, so it's a good option for those who need to write in multiple languages and want to improve their writing abilities.