Best AI tools for grammar style

DeepL Write

Writing · DeepL proprietary LLM

AI writing assistant from the team behind DeepL Translator, tuned for fluent rewrites across 19 languages.

Grammarly

Writing · Proprietary + multi-model

Cross-app AI writing assistant that catches errors, rewrites paragraphs, and adjusts tone in the tools you already use.

HyperWrite

Writing · Multi-model (undisclosed)

Browser-based AI writing assistant with autocomplete, persona-matching, and integrated research citations.

Jetwriter AI

Writing · Multi-model (GPT-5, Claude Opus/Sonnet, Gemini Pro)

Multi-model AI writing assistant that lives inside Gmail, LinkedIn, WhatsApp Web, and any other tab.

Jetwriter AI

Writing · Multi-model (GPT-5, Claude Opus/Sonnet, Gemini Pro)

Browser-based AI writing assistant that lives in Gmail, WhatsApp, LinkedIn, and Outlook and learns your past replies.

ProWritingAid

Writing · Multi-model (proprietary + LLM-assisted features)

AI-powered writing coach and manuscript editor built for fiction authors and long-form writers.

QuillBot

Writing · Undisclosed (proprietary)

AI paraphrasing and grammar suite that grew into an all-in-one writing toolkit.

Rytr

Writing · Undisclosed

Budget AI writing assistant covering 40+ short-form copy use cases with a usable free tier.

STORM

Writing · Multi-model (via LiteLLM)

Stanford's open-source research agent that turns a topic into a Wikipedia-style article with citations.

ShyEditor

Writing

AI-native writing environment that bolts an assistant, citation manager, and knowledge base onto a distraction-free markdown editor.

Wordtune

Writing · AI21 Labs (Jurassic-family) + multi-model

AI rewriting and paraphrasing assistant from AI21 Labs that polishes tone, summarizes long content, and drafts in your voice.