If you write for a living, you have probably tried both Grammarly and ProWritingAid at some point. Both promise to polish your prose, catch errors your eyes miss, and make you a better writer. But they take different approaches, and choosing the wrong one means either paying more than you need to or wrestling with a tool that does not match the way you work. I spent weeks testing both editors across blog posts, client emails, and long-form drafts to see which one actually delivers. Here is what I found.
At a glance
What it is: Two popular AI writing assistants that check grammar, style, and readability in real time. Best for: Grammarly suits business professionals and students who need fast, clear edits; ProWritingAid fits creative writers and novelists who want deep structural reports. Pricing: Grammarly offers monthly and annual premium plans; ProWritingAid has annual and lifetime purchase options at a lower price. Strength: Grammarly delivers unlimited AI suggestions and works seamlessly across apps; ProWritingAid provides in-depth reports on pacing, dialogue, and character development. Limitation: Grammarly costs more and lacks a lifetime option; ProWritingAid limits daily AI edits and charges extra for plagiarism checks.
What each editor actually does
Both tools catch typos, grammar mistakes, and awkward phrasing, but they diverge quickly after that. Grammarly focuses on making your writing clear and professional. It highlights passive voice, wordy sentences, and tone problems as you type. The suggestions appear in a sidebar or inline, and you click to accept or ignore them. The interface feels clean and fast. You get real-time feedback whether you are drafting an email in Gmail, writing a blog post in WordPress, or typing a Slack message.
ProWritingAid goes deeper. It offers the same grammar and style checks, but it also includes 20-plus detailed reports that analyze your entire document. You can run a report on sentence length variation, overused words, readability scores, and even how much dialogue versus narration you have. If you write fiction, the pacing report shows where your story drags or rushes. The sticky sentence report flags passages that are hard to follow. These reports are not instant. You run them one at a time, review the results, and make changes yourself.
Grammarly includes plagiarism checking in its premium plans, scanning your text against billions of web pages and academic databases. ProWritingAid charges separately for plagiarism checks. You buy credits in packs, and each scan costs one credit. That adds friction if you check every draft.
How they work in real use
I tested both editors on the same 2,500-word blog post draft. Grammarly flagged 34 issues: repeated words, unclear antecedents, missing commas, and a few tone suggestions. Every suggestion appeared inline, and I accepted or dismissed each one in about eight minutes. The AI suggestions were contextual and mostly on point. When I wrote “utilize,” Grammarly suggested “use.” When I buried the main point in the third paragraph, it flagged the sentence as hard to read and offered a rewrite. The experience felt like having an editor looking over my shoulder.
ProWritingAid flagged 42 issues in the same draft, including several Grammarly missed, like repeated sentence starts and vague words. But the real value showed up in the reports. The readability report told me my average sentence length was 18 words, which is fine, but 22 percent of my sentences were hard to read. The overused words report highlighted that I used “just” 11 times and “really” 8 times. The sticky sentence report showed three paragraphs where my sentences were too dense. I spent 25 minutes working through the reports and revising. The process took longer, but the final draft was tighter.
Grammarly works everywhere. The browser extension integrates with Gmail, Google Docs, WordPress, LinkedIn, Twitter, and almost any text field online. The desktop app works with Word, Outlook, and other native applications. I never had to copy and paste text into a separate editor. ProWritingAid has a browser extension and desktop app too, but the integration is less smooth. Some features only work in the web editor or the desktop app. If you want the full report suite, you often have to paste your text into ProWritingAid rather than working in your original document.
The AI rewriting tools differ as well. Grammarly offers unlimited AI-powered suggestions in its premium plans. You can ask it to rewrite a sentence for clarity, tone, or formality, and it generates options instantly. ProWritingAid limits your daily AI edits. Once you hit the cap, you have to wait until the next day or upgrade to a higher tier. For someone editing client work all day, that limit is a problem.
Who each tool fits best
Grammarly is the better choice if you write across multiple platforms and need speed. Business professionals who draft emails, proposals, and reports benefit from the instant feedback and seamless integrations. Students writing essays and research papers get the plagiarism checker and citation suggestions without extra charges. The tone detector is especially useful if you want to sound confident, friendly, or formal depending on your audience. You write, you see suggestions, you click, you move on. It does not slow you down.
ProWritingAid is the better choice if you write long-form content and want to improve your craft. Novelists and fiction writers love the dialogue report, which shows how much of your manuscript is conversation versus action. Bloggers and content writers benefit from the readability and SEO reports. If you are willing to spend time reviewing detailed feedback, ProWritingAid teaches you patterns in your writing that you can fix yourself. It is a writing coach, not just a spell checker.
The pricing also matters. Grammarly charges a monthly or annual subscription for its premium plan. ProWritingAid offers an annual plan that typically costs less than Grammarly’s annual rate, and it also has a lifetime purchase option. If you plan to use the tool for years, the lifetime deal saves money. Grammarly does not offer a lifetime option, so you pay every year.
Where it falls short
Grammarly costs more and locks you into subscriptions
Grammarly’s premium plan is more expensive than ProWritingAid’s annual option, and you have no way to buy it once and own it forever. If you use the tool for five years, you pay five years of fees. The monthly plan is even pricier per month than the annual rate, so you feel pushed into a longer commitment. For freelancers and writers on a budget, that ongoing cost adds up. ProWritingAid’s lifetime plan eliminates that recurring charge entirely.
ProWritingAid limits your daily AI edits
ProWritingAid caps how many AI rewrites and suggestions you can generate each day. Once you hit the limit, the feature disappears until tomorrow. If you are editing multiple client projects or revising a manuscript, you run out fast. Grammarly gives you unlimited AI suggestions in its premium plans, so you never hit a wall mid-edit. ProWritingAid’s cap feels like an artificial restriction that interrupts your workflow.
ProWritingAid charges separately for plagiarism checks
Unlike Grammarly, which includes plagiarism detection in its premium plans, ProWritingAid makes you buy plagiarism credits in packs. Each scan costs one credit, and if you check every draft, you spend extra money. For students and academics who need to verify originality before submitting work, this extra cost is frustrating. Grammarly’s all-in-one premium plan is simpler and more predictable.
FAQs
Can I use Grammarly and ProWritingAid together?
Yes, and some writers do. Grammarly handles real-time grammar and tone checks while you draft, and ProWritingAid provides the deep reports for revision. You can run your draft through Grammarly first, then paste it into ProWritingAid for a second pass. Just be aware you are paying for two tools instead of committing to one.
Does ProWritingAid work offline?
The desktop app for ProWritingAid offers some offline functionality for basic grammar and style checks, but the AI features and detailed reports require an internet connection. Grammarly also needs internet access for most of its advanced features. If you write in places with no Wi-Fi, both tools are less useful.
Which tool is better for academic writing?
Grammarly is stronger for academic work because its premium plan includes plagiarism checking at no extra cost and offers citation suggestions. ProWritingAid requires you to buy plagiarism credits separately, which is inconvenient if you check every essay or thesis chapter. Both handle formal tone and clarity well, but Grammarly’s included plagiarism scanner tips the balance for students and researchers.
Can ProWritingAid improve my fiction writing?
Yes. ProWritingAid is often favored by creative writers, including novelists, due to its in-depth reports on elements like pacing, dialogue, and character development. The sticky sentence report and echoes report help you spot repetitive phrasing and awkward constructions that bog down narrative flow. Grammarly does not offer these fiction-specific tools, so if you write novels or short stories, ProWritingAid gives you feedback Grammarly cannot match.
Is the free version of either tool enough?
Both offer free plans that catch basic grammar and spelling errors, but they are limited. Grammarly’s free plan flags obvious mistakes but skips tone, clarity, and plagiarism checks. ProWritingAid’s free plan restricts how much text you can check at once and does not include most reports. If you only need occasional proofreading, the free plans work. If you write professionally or want to improve your style, you will need a premium plan from either tool.
Bottom line: Choose Grammarly if you need fast, unlimited AI suggestions, seamless integration across apps, and built-in plagiarism checking. Pick ProWritingAid if you write long-form or fiction content, want deep structural reports, and prefer a one-time lifetime purchase over recurring subscriptions.
