Struggling with writer's block? There may be a perfect tool for you.

AI writing assistants are helping businesses thrive in today's competitive landscape.

As per a McKinsey global survey on AI, creating text documents using AI is one of the top three use cases for marketing, sales, product, development, and operations. Regardless of which team you work for, AI can help you write better content, such as marketing emails, technical documents, product designs, and more.

With the help of G2 data, we will take a deep dive into AI writing assistants to find which tool ranks best for two vital facets of writing and editing—grammar correction and formatting.

AI writing assistants can significantly reduce writing and editing time

AI writing assistant software helps to enhance the writing process by harnessing the power of artificial intelligence. These tools empower professionals across various sectors, from marketers crafting compelling emails to HR recruiters refining job descriptions. 

Top products in this space offer real-time grammar correction, tone refinement, and content creation. Users can write quickly and confidently as these AI assistants provide tailored recommendations based on different use cases.

How does AI writing assistant software benefit modern businesses?

• Enhanced efficiency: AI can automate tedious tasks like grammar checking and content research. This enables teams to produce more content in less time.
• Improved quality: With advanced natural language processing (NLP) algorithms, these tools offer insightful recommendations to refine tone, style, and structure. This often results in high-quality written materials that resonate with the target audiences. 
• Streamlined collaboration: Many AI writing tools today have collaborative features and integrate with existing tools. This facilitates smoother teamwork and ensures consistent messaging and branding.

However, not all AI writing assistants are created equally. The best grammar check assistant is not the best content generation assistant. In addition, the scale of adoption is now visible in G2’s own data. As of June 2026, the AI Writing Assistants category has 1,227 product listings, a monumental increase of 1,704% in under two years (Out of 68 AI writing assistant software listed on G2 at the time of this blog being published in 2024), showing that the vendor landscape has also changed drastically. Rounding up the top 5 in the AI Writing Assistants category includes Grammarly, Notion, Google Gemini, Microsoft Copilot, and Canva.

Top-ranked AI writing assistants in grammar correction

Although most people can get by grammar “by the ear,” writing correctly with confidence in the workplace requires knowing complex grammar rules. When was the last time you revisited grammar rules? Probably never for many working adults.

An AI writing assistant can check grammar, tone, and formatting for you. “Grammar Check” corrects grammatical errors like misspellings, sentence run-ons, etc. “Tone Check” evaluates the emotional tone of words written. “Sentence Formatting” ensures sentences are formatted properly. 

According to G2's Summer 2026 Grid Report for AI Writing Assistants, Grammarly and Microsoft Copilot lead on grammar check (both 94%), with Grammarly also topping tone check (92%) and Microsoft Copilot leading on sentence formatting (95%). Wordtune is a strong performer across all three metrics - 93% grammar check, 92% tone check, and 93% sentence formatting - making it one of the most consistent grammar-focused tools in the category. If grammar quality is your priority, these are the products the data points to.

Top-ranked AI writing assistants in formatting

On top of grammar correction, formatting is another important task that can be automated. AI writing assistants can check for plagiarism, guidelines on writing styles (MLA, APA, CMOS, etc.), and citations. 

This feature is especially helpful when you are writing for professional organizations such as colleges and medical schools. Here are the top five AI writing assistants with the best formatting features. 

According to G2's Summer 2026 Grid Report for AI Writing Assistants, within the top 10 vendors, Writesonic leads on formatting with the highest plagiarism check score (89%), tied with Grammarly on style editor (both 89%), and a citation finder score of 87%. Zoom Workplace stands out specifically in plagiarism check (88%) and citation finder (87%), while QuillBot delivers the most consistent formatting scores across all three metrics at 86% each.

Content generation is now the defining feature of AI writing assistants

Content generation is one of the most significant use cases for AI writing assistant software. When we first published this piece in 2024, content generation was the next frontier for AI writing assistants. Two years later, the numbers are clear: AI writing assistants are no longer a niche tool. With 1,227 products and 165,300+ reviews on G2, this is now one of the most adopted and most scrutinized software categories in the market. 

With 761 new reviews added in Q1 2026 alone, the pace of buyer feedback shows no signs of slowing - and the products that earn trust at scale today will be the ones that define the category tomorrow.

Learn more about voice mimicry features and how it impacts AI Writing Assistants.