Grammarly is the better tool for most people, and I’ll say that up front. If you write across Gmail, Slack, Google Docs, Notion, and whatever client portal you’re stuck in this week, Grammarly’s browser extension makes it the only real option. ProWritingAid earns a different kind of loyalty — from novelists, newsletter writers, and long-form creators who want structural analysis that Grammarly genuinely cannot provide. I’ve been running both tools across client work since late 2024. Here’s what actually matters for your buying decision.
Quick Verdict
Winner — Grammarly Premium ($12/month annual): Real-time suggestions everywhere you write, solid tone detection, and a plagiarism checker included at no extra cost. The browser extension is the entire argument.
Runner-up — ProWritingAid Annual ($79/year): Twenty-five structural report types that surface problems Grammarly misses entirely. Best for focused long-form sessions.
Budget pick — ProWritingAid Annual: At $6.58/month effective, you get a capable editing tool for less than half what Grammarly charges annually.
Comparison Table
| Feature | Grammarly Free | Grammarly Premium | ProWritingAid Free | ProWritingAid Annual |
|---|---|---|---|---|
| Price | $0 | $12/mo (annual) | $0 (500-word cap) | $79/year |
| Month-to-month | — | $30/month | — | $20/month |
| Lifetime option | No | No | No | $399 one-time |
| Browser extension | Yes | Yes | No | No |
| Real-time suggestions | Yes | Yes | Paste-and-edit only | Paste-and-edit only |
| Tone detection | Basic | Yes | No | No |
| Style reports | No | Basic | No | 25+ report types |
| Plagiarism check | No | Yes (included) | No | Add-on cost |
| Word processor support | Google Docs, Word | Google Docs, Word | Word, Scrivener | Word, Scrivener, Google Docs |
Grammarly Premium
Best for: Anyone who writes across multiple apps and surfaces every day
Grammarly’s pricing is straightforward: free for basic grammar and spelling, $12/month billed annually ($144/year) for Premium, or $30/month on a rolling monthly plan — a significant gap that punishes short-term commitments. Business starts at $15/user/month annually with team style guides and usage analytics.
The browser extension is the whole product. On Chrome and Arc (my daily driver on an M2 MacBook Air), suggestions appear within about half a second of pausing mid-sentence. That’s fast enough to feel ambient rather than interruptive. It follows you into Gmail, Google Docs, Notion, Slack, and most CMSs without any configuration.
Tone detection is the sleeper feature at the Premium tier. I set domain, audience, and formality in the goals sidebar before drafting a sensitive client email last quarter — Grammarly flagged my opener as “formal but slightly cold” and offered two rewrites. One was better than what I’d written.
Specific UX observation: The goals sidebar (the document icon in the lower right of the editor) is where most of the personalization lives — and most users completely ignore it. When I switched domain from “Business” to “Creative” for identical copy, I got substantively different suggestions, including a structural rewrite of my opening sentence. Without setting goals, you’re using a fraction of what you paid for.
Pros:
- Browser extension covers 95% of surfaces where you actually write, with zero context-switching
- Suggestions appear inline with no modal interruptions
- Tone detection catches register mismatches before clients notice them
- Plagiarism check covers 16 billion web pages, included at the Premium tier
- First-party Google Docs integration, not a workaround
Cons:
- Suggestions are sometimes confidently wrong. In a 1,500-word draft, Grammarly flagged “which” vs “that” in relative clauses five times — four were incorrect per Chicago style. Each required manual verification that cost more time than just proofreading myself.
- No meaningful document-level structural analysis — it sees sentences, not shape
- The plagiarism report returns match percentages without source excerpts, requiring manual click-throughs to verify anything
- Month-to-month at $30/month is punishing for occasional or seasonal use
A failure I actually hit: While reviewing a 3,200-word Google Doc, I used the “Accept All” batch option on a suggestion category. It rewrote three sentences into passive voice — the opposite direction I wanted. There’s no undo within the Grammarly extension itself. Rolling back in Google Docs with Cmd+Z wiped 20 minutes of other edits. Batch acceptance has no preview and no recovery path. That was a bad afternoon.
Score: 8.2/10
ProWritingAid
Best for: Fiction writers and long-form creators who draft in focused, dedicated sessions
ProWritingAid’s free tier limits you to 500 words per processing session — enough to evaluate the interface, not enough to do real work. Premium runs $20/month or $79/year ($6.58/month effective). The $399 lifetime license is the most compelling pricing in this category: it pays for itself against the annual plan at month 60, and you never deal with a renewal cycle again.
Here’s the thing: ProWritingAid is built around a fundamentally different workflow. Where Grammarly interrupts as you write, ProWritingAid wants you to finish drafting and then analyze. Its 25+ report types — Readability, Sticky Sentences, Echoes, Pacing, Dialogue Balance — surface structural problems that real-time suggestions simply cannot catch.
The Sticky Sentences report is a good example. On a 4,000-word client piece I was editing, it flagged that 13% of sentences used passive or “sticky” constructions at a density that would visibly slow reader pacing. I wouldn’t have caught that on a readthrough. Grammarly wouldn’t have flagged it at all.
Specific UX observation: Opening a 5,000-word document in the Mac desktop app on my M2 MacBook Air takes about 4-5 seconds before the first report populates. Subsequent edits within the session are faster, but that initial load consistently breaks my focus. (Weirdly, the web editor loads faster than the native app — worth knowing before you download anything.)
Pros:
- 25+ structural reports surface problems no inline tool can see
- Annual ($79/year) and lifetime ($399) pricing beats Grammarly on pure cost math
- Scrivener integration works well — the only major writing tool that supports it
- No aggressive upsell inside the interface once you’re subscribed
- Pacing and readability analysis is genuinely useful for anything over 2,000 words
Cons:
- No real browser extension. If you write in Notion, Gmail, or Slack, ProWritingAid has no presence there. You’re copying and pasting into its editor, which kills any flow state immediately.
- Mobile experience is poor — the iOS app in early 2026 still lacks the full report suite. On my iPad Pro, I got basic grammar checks only, no structural reports at all.
- The interface feels dated — switching between report types requires navigating sidebar menus that clearly predate modern UX patterns
- Plagiarism checking costs extra above the base Premium plan, which isn’t disclosed prominently during signup
A failure I actually hit: ProWritingAid’s Google Docs add-on exists, but it’s buried three levels deep in the Extensions menu. During a client editing session, it stopped loading mid-document with a generic “Something went wrong” error — no error code, no recovery path. I had to close the sidebar, reopen the document, and reload from Extensions. This happened twice across a two-week period, costing about 8 minutes each time. For a paid tool, that’s an unacceptable failure loop.
Score: 6.5/10
The Verdict
Buy Grammarly Premium if you write across multiple apps. The browser extension is the entire argument. When your writing happens in Gmail, Google Docs, Notion, Slack, and a client CMS all in the same day, ProWritingAid cannot compete — it lives in its own editor while you’re everywhere else.
Buy ProWritingAid Annual if you write long-form in focused sessions. Novelists, newsletter writers, and long-form bloggers who sit down for 2-hour drafting blocks will extract more value from 25 structural reports than from real-time inline suggestions that interrupt their flow.
Buy ProWritingAid Lifetime ($399) if you have a 3-plus year horizon. It pays for itself against the annual plan in 5 years and never needs renewal. For working writers who plan to still be doing this in 2030, it’s the best deal in writing software right now.
If budget is the deciding factor, ProWritingAid wins clearly — $79/year vs Grammarly’s $144/year saves you $65 annually for a tool that handles long-form editing better than anything at that price.
I keep Grammarly Premium active because I write across too many surfaces to live without the extension. ProWritingAid gets opened for structural editing passes on longer client projects. The $223/year dual subscription is worth it for my volume. For most writers, pick based on where and how you write — not which tool has the better marketing page.
FAQ
Can you use Grammarly and ProWritingAid at the same time? Yes. They don’t conflict technically — Grammarly handles real-time coverage everywhere; ProWritingAid handles deep structural editing after a draft is done. The question is whether the combined cost of roughly $223/year is justified for your writing volume and workflow.
Is ProWritingAid’s $399 lifetime deal actually worth it? At $79/year on the annual plan, the lifetime option pays for itself at month 60 — just under 5 years. If you’re a working writer who will still need editing software in 2030, it’s a smart purchase. If you’re not sure you’ll use it consistently, start with the annual plan. No lock-in, easy to upgrade later.
Does Grammarly work in Microsoft Word? Yes, via the desktop add-in on both Windows and Mac. It works, though I noticed suggestion lag in longer Word documents — anything over 10,000 words on my M2 MacBook Air sometimes takes 2-3 seconds for suggestions to appear after a pause. Not a dealbreaker, but noticeable.
Is Grammarly’s free tier actually useful? For catching typos and obvious grammar errors before you send something, yes. For tone, clarity, or structural improvement — no. The free tier is effectively a demo with enough functionality to show you what you’re missing. ProWritingAid’s free tier is even more constrained at 500 words per session.
Which is better for non-native English speakers? Grammarly, by a meaningful margin. Its real-time inline corrections with brief explanations help build pattern recognition as you write. ProWritingAid’s report-based approach flags issues without consistently explaining them in context — it assumes you already know why something is wrong, which isn’t always a fair assumption.