SEO.ai vs Grammarly: Which writing assistant is right for you?

It feels like a new AI writing tool pops up every other day. The market is crowded, and it's hard to tell what's genuinely new and what's just a rebrand.

Two names you'll see a lot are SEO.ai and Grammarly, but they're built for completely different tasks. Think of it like this: SEO.ai is made to help you create and optimize brand new content from the ground up, with a sharp focus on ranking in search engines. Grammarly, on the other hand, is all about polishing and perfecting the words you've already written.

We're going to break down their features, who they're for, and what they cost so you can pick the right one for your workflow. We’ll also touch on a third option: an AI teammate like the eesel AI blog writer, which can take you from a single keyword all the way to a finished, publish-ready post.

What is SEO.ai?

SEO.ai is an AI platform designed for one main purpose: creating content that ranks high on search engines like Google. It’s more than just a writer; it's a full toolkit for researching, drafting, and optimizing long-form articles from a single dashboard.

The whole point is to give you a real shot at climbing the search engine results page (SERP). It achieves this by mixing content generation with SEO insights.

Here are its key features:

• AI writer: You can feed it a target keyword, and it will generate outlines, drafts, or even complete articles to get you started.
• Keyword research tools: It has built-in functions to help you find relevant keywords and see what’s already ranking, so you know the competitive landscape.
• Content optimization: While you write, it provides real-time tips on how to improve your on-page SEO. It’s a bit like having a tool like SurferSEO built directly into your editor.
• Collaboration: It includes workflow features for content teams and agencies, letting multiple people work on the same piece of content.

SEO.ai is really for SEO specialists, content marketers, and agencies whose main goal is to grow organic traffic by consistently publishing high-ranking blogs.

What is Grammarly?

You've probably heard of Grammarly. It’s one of the most well-known AI writing assistants available, and its job is to improve the quality, clarity, and correctness of your writing. It’s less of a content creator and more of a super-smart proofreader and style coach.

A big part of its appeal is that it works almost everywhere you write.

Here’s what it does best:

• Real-time checks: It’s always looking over your shoulder (in a helpful way), catching typos, grammar mistakes, and punctuation errors as you type.
• Style and tone suggestions: It goes beyond just being correct. Grammarly can help you tweak your writing to sound more confident, formal, or friendly, depending on your goal.
• Plagiarism checker: This is a useful feature for ensuring your work is original, which is a big deal for students and professional writers.
• Clarity prompts: With its generative AI feature, GrammarlyGO, it can suggest different ways to phrase sentences to make them more concise and easier for your audience to read.

Grammarly is a flexible tool for pretty much anyone who writes: students, professionals, authors, you name it. It's available as a browser extension, a desktop app, and even a mobile keyboard, so it can slide into just about any workflow.

Core feature comparison: SEO.ai vs Grammarly

While these tools have different primary objectives, comparing them side-by-side makes it very clear what each one offers.

Content creation

• SEO.ai: This is its core function. It can take one keyword and generate a full article draft, complete with an outline and all the necessary headings. It’s built to handle the heavy lifting of that first draft.
• Grammarly: Grammarly doesn't really generate long-form content. Its AI feature, GrammarlyGO, is better for quick, short-form tasks like writing a fast email reply, brainstorming ideas, or rephrasing a clunky sentence. Its main purpose is still editing, not creating from scratch.

SEO optimization

• SEO.ai: This is its specialty. The platform gives you data-driven advice on keyword usage, heading structure, article length, and other on-page factors. It looks at the top-ranking pages for your keyword and tells you what you need to do to compete.
• Grammarly: It has no native SEO features. Any suggestions it provides are based on grammar and style rules, not search engine algorithms. It will help you write a clean sentence, but it won't help you rank it.

Editing and proofreading

• SEO.ai: It includes some basic spelling and grammar checks, but it's not a specialized editing tool. You'll likely want to run its output through a dedicated proofreader.
• Grammarly: This is where it excels. Grammarly’s analysis of grammar, tone, style, and clarity is much more advanced than the basic checks in most content generators. It’s a proper editor.

Here’s a quick summary of how they compare:

The quality concern: Does 'perfect' AI writing affect SEO?

With all the recent Google updates, a lot of content creators are becoming cautious about using AI tools. There’s a rising concern that AI-generated or even heavily AI-edited content might get flagged. Some SEOs even have a theory that over-editing with a tool like Grammarly can make human writing seem 'too perfect' and robotic.

Grammarly has completely changed in the last year and now, it's trying to rewrite everything to conform to its uniform application of language. If you let it modify all your sentences, your copy will read like it's written by AI, end of story.

Reddit

For instance, one user on a popular Reddit SEO forum shared that after running their 100% human-written content through Grammarly, it started getting high scores on AI detection tools.

A lot of my content, that I wrote with zero AI (but with grammarly) got a high 'AI score' on Originality AI

Reddit

So, should you be worried?

Google's official stance has been consistent: they reward helpful, high-quality content that answers a user's question, no matter how it was created. The issue isn't the tool you use; it's the quality of what you produce.

Generic, cookie-cutter writing that just rehashes what everyone else is saying is what gets ignored. This type of content usually lacks genuine experience, expertise, authority, and trustworthiness (E-E-A-T). Whether you use an AI writer or an AI editor, if you lean on it too much without adding your own unique insights, you can end up with shallow content that doesn't resonate with readers or impress search engines.

This really brings up the need for a solution that can combine AI's efficiency with the authentic depth that only comes from real human experience.

An alternative approach: The eesel AI blog writer

This is where the conversation shifts. While SEO.ai helps create a draft and Grammarly helps polish it, the eesel AI blog writer offers a comprehensive approach, managing the entire workflow from beginning to end. You provide a keyword, and it delivers a complete, media-rich, and publish-ready blog post.

It’s designed to address common concerns about AI-generated tone by using deep brand context and a writing style that’s been fine-tuned for over a year to sound genuinely human. In fact, this is the same tool we used to grow our own blog from 700 to 750,000 impressions in just three months.

It also has a bunch of features that neither SEO.ai nor Grammarly offer in one place:

• Automatic asset generation: It doesn't just write text. It creates tables, charts, and AI-generated images right within the article, saving you a ton of time.
• Social media integration: To add a layer of authenticity and social proof, it can pull in real quotes from Reddit threads and embed relevant YouTube videos.
• Context-aware research: It digs deeper than shallow AI filler. If you're writing a comparison post, it automatically finds pricing data. For a product review, it finds technical specs.
• AEO optimization: The content is structured not just for traditional SEO but also for AI answer engines like Google AI Overviews and Perplexity, which is becoming more and more important.

  

You can generate your first blog post completely free to see the quality for yourself.

Pricing and plans: SEO.ai vs Grammarly

Cost can be a big factor, so let's see how each tool is priced. For the latest information, it's always smart to check their official websites.

SEO.ai pricing

SEO.ai follows a subscription model with different tiers based on how many articles you need and which features you want.

• Plans are typically set up for different user types, from individuals up to agency or enterprise packages that include more advanced collaboration and optimization tools.

Grammarly pricing

Grammarly has a few different plans, which makes it accessible to a wide audience.

• Free plan: This covers the basics, like checks for grammar, spelling, and punctuation.
• Premium plan: For a monthly or annual fee, you get everything in the free plan plus advanced features for style, tone, clarity, and plagiarism detection.
• Business plan: This plan is for teams and adds a centralized style guide, user analytics, and unified billing.

eesel AI blog writer pricing

The eesel AI blog writer has a simple, credit-based system, so you only pay for what you actually use.

• Credit-based: There are no recurring monthly subscriptions. You just buy credits when you need them.
• Pricing: A package of 50 blog posts costs $99.
• Free trial: You can generate your first blog post completely free to try it out.

For a more visual breakdown of how these tools can impact your SEO, check out the video below, which explores whether using a tool like Grammarly can directly influence your search rankings.

This video explores whether using a tool like Grammarly can directly influence your search rankings.

Which tool should you choose?

The right tool for you really comes down to what problem you're trying to solve in your content creation process.

• Choose Grammarly if: You're a confident writer who already handles the research and drafting. You just need a powerful proofreader to catch errors, improve clarity, and make sure your tone is right. Think of it as your final-pass editor.

• Choose SEO.ai if: Your main job is creating content specifically to rank in search results. You need a tool to help with keyword research, SERP analysis, and on-page optimization as you write. It’s your SEO assistant.

• Try the eesel AI blog writer if: You need to scale up your content production without letting quality slide. It acts as an AI content teammate, handling everything from initial research and writing to generating assets and optimizing the final post for both SEO and AEO.

Ready to see what it's like to go from a single keyword to a complete, optimized article in minutes? Generate your first blog for free with the eesel AI blog writer and see the difference for yourself.