Grammarly vs ProWritingAid vs Hemingway (2026)

Three tools that look like competitors and mostly aren’t. Grammarly is a correctness layer that follows you around the internet. ProWritingAid is an analysis tool that tells you things about your manuscript you can’t see yourself. Hemingway is a single-purpose clarity meter that happens to be free.

This comparison is built from each vendor’s published plans and documentation plus third-party pricing coverage, checked September 2026. It is not based on a hands-on trial of all three, and where sources disagree on a number we say so rather than inventing precision we don’t have.

The Quick Answer

Grammarly if you write professionally across lots of surfaces — Gmail, Slack, Docs, LinkedIn, your CMS. The value is ubiquity, not depth.

ProWritingAid if you’re writing something substantial — a novel, a thesis, a long report — and you want to be shown your own patterns: the word you lean on, the sentence rhythm that’s gone flat, the dialogue tags repeating.

Hemingway as a free second opinion. Paste, read the highlighting, shorten the red sentences, move on.

Pricing, September 2026

GBP figures are converted at roughly $1.355 to the pound (the rate sat near 1.356 in early September 2026) and rounded. Vendors bill in USD unless noted, so your card rate will differ slightly.

Three things in that table matter more than the rest.

The monthly-billing penalty is brutal on both paid tools. Grammarly and ProWritingAid both list $30/month monthly against $10–12/month annually. Paying monthly costs roughly two and a half times as much. If you’re going to use either for more than a quarter, annual is the only sensible choice.

Grammarly’s free tier is now metered on AI. 100 prompts a month on Free, 2,000 per member on Pro, unlimited only on Enterprise. If what you want from Grammarly is rewriting rather than proofreading, the free tier will run out.

ProWritingAid’s lifetime licence is the outlier. $399 once for Premium, $699 for Premium Pro. Against Grammarly Pro at $144/year, Premium Lifetime breaks even in under three years. If you expect to still be writing in 2030, that’s a different calculation to a subscription.

What Each One Actually Does

Grammarly — the correctness layer

Grammarly’s real product is the extension. It sits in the text field and flags problems while you’re typing, in Gmail, Slack, Docs, LinkedIn, your CMS, wherever. That’s the thing competitors haven’t matched, and it’s why Grammarly is the default recommendation for people whose writing is spread across a dozen apps.

It handles grammar, spelling, punctuation and tone detection, with AI rewriting on top. Plagiarism checking is on Pro. Business tiers add team style guides and admin controls at $25/user/month.

Where it disappoints: its suggestions pull toward a generic corporate register. It will push you to replace perfectly good informal phrasing in contexts where informality was the point, and UK English handling has historically been weaker than US. For a comparison site run out of London, that’s worth knowing: check the language setting before you accept a run of suggestions.

ProWritingAid — the analysis tool

ProWritingAid’s differentiator is its reports — more than twenty of them, covering readability, sentence-length variation, overused words, clichés, echoes, pacing, dialogue tags, sticky sentences. It isn’t trying to fix your document in one pass. It’s trying to show you the shape of it.

Premium covers the checker, the reports and the integrations including Word. Premium Pro adds plagiarism checking. Both are available as lifetime licences.

Where it disappoints: the interface is busier than Grammarly’s and there’s a genuine learning curve. Running twenty reports on a 200-word email is absurd, and the tool doesn’t stop you doing it. Its browser coverage is real but thinner than Grammarly’s, and Google Docs support has long been the weak spot.

Hemingway — the clarity meter

Hemingway highlights hard-to-read sentences, passive voice, adverbs and complex words, and gives you a readability grade. The web editor is free with no word cap. That’s the whole pitch and it’s a good one.

Editor Plus is a paid tier, but what you’re buying is an AI sentence-rewrite allowance — 5,000 rewrites a month at $100/year, 10,000 at $150/year, with team seats at the same $150/user/year. You are not buying a better grammar checker. If you don’t want AI rewrites, the free version is the product.

Where it disappoints: it misses grammar errors the other two catch, has no style library, and has opinions it applies regardless of context. Long sentences aren’t always bad. Passive voice is sometimes correct. Hemingway doesn’t know the difference.

The Decision

Using two isn’t unreasonable. Hemingway free for a clarity pass, then Grammarly in the browser for mechanics, is a workable stack costing $144 a year. Adding ProWritingAid on top only makes sense if you’re regularly working at length.

FAQ

Is Grammarly’s free plan still worth using? Yes, for proofreading. You get grammar and spelling checks and the extension. What’s capped is AI — 100 prompts a month. If you mostly want error-catching rather than rewriting, Free covers it.

Which is cheaper over five years? ProWritingAid Premium Lifetime at $399 once. Grammarly Pro at $144/year reaches $720 over five years; ProWritingAid Premium annual reaches $600. Lifetime wins clearly if you keep writing, and it’s the single strongest value argument in this comparison.

Can I run Grammarly and ProWritingAid together? Technically yes, and plenty of people do — different strengths, and the extensions don’t normally fight. Whether you want to pay roughly $264 a year for both is another matter. For most people the answer is one paid tool plus Hemingway’s free editor.

Does either handle plagiarism checking? Grammarly includes it on Pro. ProWritingAid puts it on Premium Pro ($144/yr or $699 lifetime), not standard Premium. If originality checking is a requirement, price that tier specifically rather than the headline one.

Is Hemingway Plus worth $100 a year? Only if you want the AI sentence rewrites. The readability highlighting that Hemingway is famous for is free and uncapped in the web editor. Don’t pay for Plus expecting a stronger editor — you’re buying a rewrite allowance.

Which is best for UK English? Both paid tools support British English, and both default to US unless told otherwise. This is a settings problem rather than a product difference, but it’s the single most common complaint from UK users, so check it first.

Do they work on mobile? Grammarly has the strongest mobile story, including a keyboard. ProWritingAid is effectively desktop and browser. Hemingway works in a mobile browser. If you draft on a phone, Grammarly.

Will any of these make me a better writer? ProWritingAid has the best claim, because its reports describe your habits rather than just correcting instances — you start noticing the crutch word before the tool does. Grammarly fixes the document in front of you. Hemingway teaches exactly one lesson, which is that your sentences are too long.

The Verdict

Grammarly wins on reach and it’s the right default for professional writing spread across lots of apps. ProWritingAid wins on depth and on cost-over-time, and for anyone working on something long it’s the better purchase — the lifetime licence in particular is hard to argue against. Hemingway should be open in a tab regardless, because it’s free and it takes ten seconds.

If you only buy one: Grammarly Pro at $144/year for general professional writing, ProWritingAid Premium for long-form work, and Premium Lifetime at $399 if you’re confident you’ll still be writing in five years.

Pricing checked September 2026 against each vendor’s published plans and third-party pricing coverage. Plans and AI allowances on all three have changed repeatedly through 2026 — confirm the current number on the vendor’s own pricing page before you buy.

Further reading: Best AI writing tools | Free AI tools worth using in 2026 | The freelance writer’s stack