Grammarly or ChatGPT?

A year or two ago, I compared both these AI tools.

Now, ChatGPT has changed a lot since 2023, and so has Grammarly. In this updated comparison, I’m putting both to the test so you can see what’s best for fixing your work and pressing publish.

Let’s start with pricing. You can use Grammarly for free, but to access its AI tools for grammar checking and content generation, you’ll soon upgrade to Grammarly Pro (previously Premium). That costs $12 per month if you pay annually, or $30 monthly for short-term projects.

With Grammarly Pro, you can rewrite full sentences at a click, adjust writing tone, get personalized suggestions, detect plagiarism, and generate text with AI.

Similarly, while ChatGPT offers a free version, you’ll need ChatGPT Plus ($20 monthly) to access its latest reasoning models. Interestingly, Grammarly Pro connects to OpenAI and ChatGPT models, so you’re getting some ChatGPT capabilities with your Grammarly subscription.

For this comparison, I used ChatGPT–4.0 — it’s fastest for written content and questions. I’ve found ChatGPT–4.5 quickly hits usage caps, which is why I focused on 4.0.

I write and send a daily email to my list, around 500–600 words, which I create quickly. For testing, I copied my daily email into both tools —…