Grammarly vs ProWritingAid vs Free Checkers: What You Actually Get for the Money
Grammar checking is a solved problem. Spelling, agreement, obvious punctuation: every serious tool catches these now, including the free ones. So when Grammarly and ProWritingAid ask for real money, they are not selling grammar. They are selling depth, convenience, and increasingly, AI quotas, and the honest question is whether your writing life needs any of the three.
Here is what each tier actually buys as of mid 2026, based on the vendors' published pricing, and where a free checker genuinely covers you.
What your money actually buys
Strip the marketing and paid writing tools charge for four things. Coverage: working inside your email, browser, and documents rather than in one tab. Depth: analysis that goes past correctness into style, structure, and repetition. Volume: AI rewriting and drafting quotas. And assurance: plagiarism checks and team features. Every pricing decision below is one of those four dressed up.
Grammarly in 2026: everywhere, and polished
Grammarly's free plan checks spelling, grammar, and punctuation on unlimited text, shows basic tone signals, and includes a small monthly allowance of AI prompts. The paid Pro plan works out to roughly $12 a month billed annually, about $30 month to month, and adds full-sentence rewrites, tone adjustment, plagiarism checking, and much larger AI limits.
Grammarly's real product is ubiquity. The browser extension, desktop apps, and mobile keyboard mean it edits where you already type: email, docs, forms, chat. As an always-on safety net for professional correspondence, nothing else is as frictionless. Its weakness is depth. Suggestions optimize for smooth, inoffensive prose, and it has little to say about the structure of a long document. It polishes sentences; it does not diagnose manuscripts.
ProWritingAid in 2026: depth over gloss
ProWritingAid inverts those tradeoffs. The free plan is deliberately cramped, analyzing only around 500 words at a time, which works for emails and fails for chapters. Premium runs about $10 a month billed annually, around $30 monthly, with a higher tier for bigger AI allowances. Uniquely among the majors, the company also sells a one-time lifetime license, typically priced in the hundreds of dollars and discounted during sales, which quietly changes the whole comparison for anyone who will still be writing in three years.
The paid product's core is its report library: twenty-plus analyses covering repeated sentence starts, overused words, pacing, dialogue tags, readability by paragraph, and more. Run against a full manuscript, those reports find patterns no sentence-level checker will ever surface. That is why novelists and long-form writers cluster here despite an interface that feels more like an instrument panel than a companion. If your writing lives in one long document rather than fifty short ones, this is the paid tool that earns its fee.
The free tier reality check
The free landscape is better than most people assume, provided you match tool to job.
Our own readability checker scores sentence length, filler, and reading ease instantly, with no signup, because readability is arithmetic and arithmetic should be free. The Hemingway web editor grades prose for density and highlights hard-to-read sentences at no cost. LanguageTool offers a capable free grammar tier across dozens of languages, a real advantage for multilingual writers. And the free plans from Grammarly and ProWritingAid themselves cover baseline correctness.
What free tiers consistently withhold: plagiarism checking, the deepest style reports, big AI quotas, and team features. If none of those four appear in your actual workflow, you are not the customer the paid plans were built for, and that is fine.
Side by side
| Grammarly | ProWritingAid | Free checkers | |
|---|---|---|---|
| Entry price, mid 2026 | Free plan; Pro roughly $12/mo billed annually | Free plan; Premium roughly $10/mo billed annually | $0 |
| Free tier limit | Unlimited length, basics plus small AI allowance | About 500 words at a time | Varies; GramMachine and Hemingway are uncapped for readability |
| Lifetime option | No | Yes, one-time license | Not applicable |
| Core strength | Works everywhere you type | Manuscript-depth reports | Instant, no account, no tracking of your budget |
| Weak spot | Shallow on long-document structure | Cramped free tier, busier interface | No plagiarism, limited AI |
| Best for | Email, docs, everyday professional writing | Fiction, theses, long-form editing | Readability, style habits, quick checks |
A spending rule that holds up
Prices drift and features shuffle, so anchor on the decision rather than this month's price tag:
- Start free, deliberately. Run a month with free tiers plus a readability checker and note what you actually missed. Absence of pain is your answer.
- Pay for ProWritingAid when your problem is one long document: a novel, a thesis, a report series. The reports justify the fee, and if you will use it for years, price out the lifetime license against the subscription.
- Pay for Grammarly when your problem is volume across surfaces: client emails, proposals, docs, chat, all day. The everywhere-ness is the feature; nothing free replicates it.
- Do not pay for readability. Sentence length, filler density, and reading-ease scores are computed the same way everywhere, and free tools report them honestly.
One quieter consideration: privacy. Whatever you feed a cloud checker transits someone's servers, so check retention policies before pasting anything confidential into any tool, paid or free.
Frequently asked questions
Is Grammarly or ProWritingAid cheaper in 2026?
Billed annually they are close: as of mid 2026 Grammarly Pro works out to roughly 12 dollars a month while ProWritingAid Premium runs about 10, with both near 30 dollars on month-to-month billing. ProWritingAid also sells a one-time lifetime license, which changes the math entirely if you will still be writing in three years.
What do the free plans actually include?
Grammarly Free checks spelling, grammar, and punctuation on unlimited text and shows basic tone signals. ProWritingAid Free offers its analysis on a limited chunk of text at a time, around 500 words, which suits short pieces but not manuscripts. Free readability tools like GramMachine and the Hemingway web editor have no account requirement at all.
Which is better for fiction and long documents?
ProWritingAid, in most cases. Its report library digs into repetition, pacing, dialogue tags, and style patterns across a full manuscript, and it integrates with the tools long-form writers already use. Grammarly is stronger as an everywhere-you-type companion for email, docs, and the browser.
Do I need a paid checker at all?
Plenty of writers do not. Free tiers now cover the mistakes that embarrass you, and free readability checkers handle sentence length, filler, and clarity. Pay when you need depth: manuscript-scale reports, plagiarism checks, team features, or heavy AI drafting quotas.
Before you spend anything, see what the free math says about your writing: paste a page into our free readability checker and you will know in ten seconds whether your problem is grammar, style, or sentences that simply run too long.