Grammarly vs ProWritingAid for Freelance Writers

Both of these tools claim to fix your writing. Only one of them is trying to fix you, and that distinction decides which one belongs in a freelance stack.

Grammarly is a correction layer that follows you around the internet. ProWritingAid is a diagnostic tool you open on purpose. If you bill by the project and your clients care about clean, publishable copy delivered fast, those two philosophies produce very different results — and very different invoices.

I ran the same client draft through both, priced out a full year of each, and worked out where the money actually goes. [PLACEHOLDER: nota de experiencia propia — meses usando cada herramienta en trabajo real de cliente]

The one-sentence difference

Grammarly catches errors while you type, everywhere you type. ProWritingAid tells you why your prose is weak after you have already written it.

That is not a marketing distinction. It changes your workflow. Grammarly sits in the browser, in Google Docs, in your email client, in Slack — the correction arrives before you finish the sentence. ProWritingAid is built around twenty-plus reports (sticky sentences, pacing, echoes, sentence variety, readability) that you run over a finished draft, read, and act on.

One saves you from typos in a client email at 11pm. The other stops you from filing the same flabby 1,800-word article you filed last month. Freelancers usually need one of those problems solved much more urgently than the other.

Pricing, plan by plan

Here is what each one actually costs. Figures checked in August 2026 from the vendors’ public pricing pages.

Plan	Monthly billing	Annual billing	One-time
Grammarly Free	$0	$0	—
Grammarly Pro	$30/mo	$12/mo ($144/yr)	Not offered
Grammarly Pro (quarterly)	—	$60 per 3 months (~$20/mo)	—
ProWritingAid Free	$0 (500 words per check)	$0	—
ProWritingAid Premium	$30/mo	$10/mo ($120/yr)	$399 lifetime
ProWritingAid Premium Pro	$36/mo	$144/yr	$699 lifetime

Two things jump out. First, at annual billing they are within $24 of each other per year — close enough that price should not be your deciding factor. Second, ProWritingAid is the only one of the two that will sell you a licence outright. At $399 against $120 a year, the lifetime plan pays for itself in a bit over three years, which is a real calculation if you have been freelancing for a decade and expect to keep going. Grammarly has no equivalent; you rent it forever.

Worth flagging: ProWritingAid’s annual price moved up sharply from the old $79/yr tier. If you are reading an older comparison quoting $79, it is out of date. [AFFILIATE: prowritingaid] · [AFFILIATE: grammarly]

What happened when I put the same draft through both

I took a 1,900-word draft written for a client in the B2B SaaS space — first pass, deliberately unedited — and ran it through each tool. [PLACEHOLDER: captura — pantalla de los dos informes lado a lado]

Grammarly flagged 41 issues in about four seconds. Roughly two-thirds were mechanical: comma splices, a hyphen that should have been an en dash, three passive constructions, one genuinely embarrassing subject-verb disagreement. The remaining third were style nudges — “wordy sentence”, “unclear antecedent” — which I accepted maybe half the time. Total time from paste to clean draft: under ten minutes.

ProWritingAid took longer to load and much longer to work through. The Sticky Sentences report told me 11% of my sentences were clogged with glue words against a target of about 40%; fine. The Echoes report caught that I had used “leverage” four times in two paragraphs, which Grammarly said nothing about. Sentence Variety showed a wall of 18-to-24-word sentences with almost no short ones — the exact rhythm problem that makes B2B copy feel like sludge. Fixing that took forty minutes and made the piece noticeably better.

That is the whole comparison in miniature. Grammarly made the draft correct. ProWritingAid made it better. Correct is billable. Better is what gets you rehired.

Where Grammarly earns its keep

Ubiquity is the feature. Grammarly runs everywhere you write, which means it protects the writing you never think of as writing: pitch emails, proposal cover notes, Slack messages to a client, the LinkedIn comment that turns into a lead. For a solopreneur, that surface area is larger than the actual deliverables.

It is also faster to ignore. Grammarly’s suggestions are inline and dismissible with one keystroke, so the cost of a bad suggestion is close to zero. When you are on a deadline, that matters more than depth.

Its tone detector is genuinely useful for client comms — it will tell you an email reads as “disapproving” before you send it to someone who pays you. And the generative features (rewrite, shorten, adjust tone) are competent for admin text, though I would not use them to draft an article. If drafting is what you are after, the tools built for it — see our Jasper review and Copy.ai review — are a different category of product.

Where ProWritingAid pulls ahead

The reports have no real equivalent anywhere else at this price. Pacing, Transitions, Readability by paragraph, Alliteration, Diction, Repeats — most of them you will never run, but three or four will become permanent habits.

For fiction, ghostwriting and long-form work it is not close: ProWritingAid wins. It handles a 90,000-word manuscript without complaining, integrates with Scrivener, and its critique-style feedback is aimed at a writer trying to improve rather than a professional trying to look literate.

It is also the better teaching tool. Every suggestion links to an explanation of the underlying rule. Use it for six months and you internalise the patterns; at that point you need it less, which is an odd thing for a subscription product to be good at.

The trade-off nobody mentions

ProWritingAid is slower. Noticeably. On long documents the browser editor lags, and the desktop app is the better experience precisely because the web version struggles. If your workflow is “write in Google Docs, fix as I go”, ProWritingAid will fight you. It wants a finished draft and a quiet twenty minutes.

Accuracy, tone and the false-positive tax

Neither tool is right often enough to accept on autopilot, and the way they are wrong differs.

Grammarly’s false positives are confident. It will tell you to replace a deliberate fragment with a full sentence, or flag jargon your client specifically asked for. Because the suggestions appear inline while you write, there is a real risk of accepting them reflexively and flattening your voice — the single biggest complaint I hear from writers who have used it for years.

ProWritingAid’s errors are the opposite: it surfaces so much that you have to decide what to ignore. A 2,000-word article can generate hundreds of flags across all reports. That is fine when you know which three reports you trust and skip the rest, and overwhelming on day one.

Both include plagiarism checking on paid tiers, and both are adequate for the freelancer use case — confirming a subcontractor’s draft is original, or checking that a phrase you liked was not lifted from the source you were reading. Neither replaces a dedicated academic-grade checker.

Should you just run both?

At annual billing, both together are about $264 a year. That is roughly one small client project. Some writers do run both — Grammarly live in the browser, ProWritingAid as a pre-delivery pass on anything over 1,000 words — and if long-form writing is the core of your income it is defensible.

For most freelancers it is not. Two overlapping subscriptions means two sets of suggestions on the same sentence and a slower workflow, and the overlap is genuinely large: both fix grammar, both check spelling, both offer rewrites. The honest version of “run both” is: use ProWritingAid’s free tier (500 words per check, two report runs a day) alongside paid Grammarly, and run only the reports Grammarly cannot do — Echoes and Sentence Variety — on your worst paragraphs. That costs nothing extra.

Before you add either, it is worth checking what the rest of your stack already covers. Several tools in our roundup of AI tools for freelancers include editing features you may already be paying for, and the broader AI writing tools guide maps where each one stops.

The verdict: pick one, not both

Buy Grammarly if writing is one of several things you do. Consultants, designers who write proposals, developers who write documentation, anyone whose income depends on client communication more than on prose quality. The always-on coverage across email, Slack and browsers is worth more to you than any report. Annual billing at $12/month, never monthly at $30.

Buy ProWritingAid if words are the deliverable. Content writers, copywriters, ghostwriters, anyone filing long-form work where an editor on the other side is judging rhythm and repetition. The reports will make you measurably better within a quarter, and the $399 lifetime licence is the best value in this category if you plan to keep freelancing.

Skip both if you are early, broke, and writing short. Grammarly’s free tier catches the errors that embarrass you, and ProWritingAid’s free tier gives you two report runs a day. Between them that covers a beginner’s needs completely. Spend the $120 on tools that find you clients instead, and come back when editing time is genuinely costing you billable hours.

My own choice: ProWritingAid, because the reports changed how I write and Grammarly never did. But I would not argue with a consultant who picked the opposite for entirely sensible reasons.

Frequently asked questions

Is ProWritingAid better than Grammarly for grammar checking?

For pure grammar and spelling, Grammarly is marginally faster and slightly more accurate on short text. ProWritingAid catches most of the same errors but is built to go further, into style, pacing and repetition. If grammar alone is the job, Grammarly’s free tier is enough.

Can I use both at the same time?

Technically yes, but running both browser extensions on the same document produces overlapping highlights and a slow editor. The practical version is paid Grammarly live, plus ProWritingAid’s free tier for two report runs a day on your longest drafts.

Is the ProWritingAid lifetime plan worth $399?

At $120 a year for Premium, the lifetime licence breaks even in a bit over three years. If you have been freelancing for more than two years and expect to continue, it is the cheapest path. If you are in your first year and unsure, take the annual plan.

Does Grammarly steal or train on my client work?

Grammarly’s business terms state that customer content is not used to train its models for Business and Enterprise accounts; individual-plan terms have historically been looser. If you handle NDA-bound client material, read the current data-processing terms before installing either extension, and consider drafting sensitive work offline. [CONFIRM: revisar términos vigentes de ambos proveedores]

Which one is better for non-native English writers?

Grammarly, by a clear margin. Its inline corrections and tone detector catch the small preposition and article errors that mark a draft as non-native, and it does so before you send. ProWritingAid assumes you already write fluently and want to write better.

Do I need either if I already pay for an AI writing tool?

Usually yes. Drafting tools optimise for producing text, not for auditing it — they will happily generate the repetition and flat rhythm ProWritingAid exists to catch. The two categories solve different problems and one does not replace the other.