Grammarly vs ProWritingAid for Australians 2026: Everyday Writing or Deep Editing?

Pricing figures updated 6 September 2026: USD prices are converted at the current rate (1 USD ≈ 1.40 AUD, verified 5 September 2026) and shown ex-GST, replacing the retired 1.55 + GST basis. A GST-registered Australian business that supplies its ABN is not charged GST on an imported digital service; other buyers should allow ~10% on top (Methodology).

Winner: Grammarly for the typical Australian business writer — it follows you into every text box, fixes the email or the proposal as you type, drafts and re-tones with AI, and the free tier is worth installing today. Pick ProWritingAid if you write long-form — novels, screenplays, detailed reports — where its 25+ analysis reports and Scrivener support leave Grammarly behind, and its one-off lifetime licence beats paying forever. Grammarly scores 18/25, ProWritingAid 15/25. Both bill in US dollars, host data in the US and score Australian Fit 2/5, so neither clears our Australian Fit gate for a category Top Pick.

Last reviewed: 20 September 2026 by Adam.

ℹ Vendor note — 20 September 2026: Grammarly is now part of Superhuman. Grammarly's homepage says "Grammarly is now a part of Superhuman" and its footer reads "2026 © Superhuman Platform". The parent renamed itself from Grammarly to Superhuman on 29 October 2025. Nothing in this comparison changes — Grammarly's prices, plans and data hosting are unchanged at our 20 September check, and Pro is still US$12/month on annual billing and US$30 month to month. The name on your invoice is Superhuman Platform.

Sources: grammarly.com · grammarly.com/plans. Read 20 September 2026. Wayback: capture pending (archive.org unavailable 20 Sep 2026).

If you want one tool to clean up your writing, these are the two serious contenders most Australians weigh against each other. Grammarly is the in-line assistant that follows you across the web and fixes things as you type. ProWritingAid is the deep editor that pulls a long document apart report by report. They sound similar, but they're built for different writers, and the gap between an 18/25 and a 15/25 is mostly about who you are. Grammarly is the easy everyday choice; ProWritingAid is the specialist's tool. Here's how to pick.

At a glance

What both tools actually do

Both check and improve writing you've already produced. Both run inside the apps you work in, both flag grammar, style and clarity issues, and both have bolted a generative AI layer on top in recent years. Neither bills in Australian dollars, neither hosts data locally, and neither states plainly how it handles GST. From there they part ways on philosophy and reach.

Grammarly is the everywhere-assistant. Install the browser extension or desktop app and it works in the background across Gmail, Outlook, Google Docs, LinkedIn, your CRM, Slack and almost any text field you type into. It underlines the spelling slip, flags the clumsy sentence, reads your tone, and now rewrites full sentences, re-tones a message in one click and drafts from a prompt (up to 2,000 prompts per member each month on Pro). It also runs plagiarism and AI-content detection. Its defining trait is reach and ease: it comes to you, with near-zero setup, which is why non-technical people actually keep using it.

ProWritingAid is the deep editor. Made by UK firm Orpheus Technology and running since 2012, it targets writers producing long-form work. Where Grammarly flags a passive sentence and moves on, ProWritingAid runs 25+ analysis reports covering overused words, clichés, pacing, dialogue tags, readability and how your style compares to 90+ published authors. Its AI layer, Sparks, rewrites passages and suggests dialogue, and a Chapter Critique tool reads a chapter and reports on structure and pacing. It edits what you've written; it doesn't generate from scratch. Its standout is depth no consumer rival matches, plus Scrivener integration that Grammarly simply doesn't offer.

In short: Grammarly is broad and fast; ProWritingAid is deep and thorough. One follows you everywhere, the other goes deeper than anything else on a single document.

Pricing in Australia

Neither tool bills in Australian dollars. Grammarly offers regional pricing in Euros, pounds and rupees only; ProWritingAid is USD across the board. We convert at roughly 1.40 and show figures ex-GST (a GST-registered business quoting its ABN is not charged GST; other buyers add ~10%); treat the AUD figures as estimates that move with the exchange rate and any card conversion fee. Both vendors leave GST undocumented, so check your first invoice.

Grammarly opens at US$12/month for Pro billed annually — about A$17/month inclusive — or US$30/month (about A$42) if you pay month to month, with a quarterly option in between. That annual rate is fair for what you get: rewrites, one-click tone changes, 2,000 AI prompts a month, plagiarism and AI detection. Two things sting: you only get the cheap rate if you commit a year up front, and the casual monthly price is steep. The free tier, though, is genuinely useful and the right place to start.

ProWritingAid opens at US$30/month for Premium (about A$42) — but nobody should pay that. The annual plan is US$120/year (about A$168), which works out to roughly US$10/month, a third of the monthly price. Premium Pro is US$36/month or US$144/year (about A$202) and adds more daily Sparks. The differentiator is the lifetime licence: US$399 (about A$559) for permanent Premium access, or US$699 (about A$979) for Premium Pro. Grammarly has no equivalent. At the annual rate you break even on the lifetime plan in just over three years, so for a committed writer it's the standout-value option in this pair. ProWritingAid's free plan, by contrast, is near-useless: a 500-word cap, two report runs a day and three Sparks — enough to glimpse the tool, not to evaluate it.

The honest read: for a few dollars a month, Grammarly is the cheaper, lower-commitment everyday buy. But if you'll use the tool for years, ProWritingAid's one-off lifetime licence is the cheaper destination — pay once, never again.

Where Grammarly wins

• It works everywhere you type. Browser, desktop, mobile keyboard and Word — the same checking and rewriting follows you across nearly every app, with almost no setup. ProWritingAid integrates with fewer surfaces and has no mobile app at all.
• A free tier worth installing. Spelling, grammar, tone and 100 AI prompts at no cost — most people get real value without paying. ProWritingAid's 500-word free cap can't compete.
• Generative AI that helps day to day. One-click rewrites and tone changes are small, frequent wins across a working week. ProWritingAid's Sparks is useful but secondary to its analysis.
• Easiest to actually keep using. In-line suggestions and one-click fixes mean near-zero learning curve — exactly what a busy owner wants. ProWritingAid's report-heavy interface is cluttered and slower to learn.
• A mobile keyboard. Grammarly has had iOS and Android apps for years. ProWritingAid has none — a real gap if you write on a phone.

Where ProWritingAid wins

• Unmatched depth. 25+ reports in a single pass surface patterns you don't notice yourself — repeated sentence openings, overused words, passages where pacing stalls. No consumer writing tool gives you this much in one place.
• Scrivener support. If you write long-form in Scrivener, ProWritingAid is almost the only choice — Grammarly doesn't integrate with it at all. For many novelists and screenwriters, this alone decides it.
• A one-off lifetime licence. US$399 (about A$559) for permanent access has no Grammarly equivalent. For a writer using the tool for years, it's the cheapest long-run option in this pair.
• Manuscript-level feedback. Chapter Critique reads structure, pacing and characterisation across long work — a job Grammarly's sentence-level focus isn't built for.
• No training on your writing. ProWritingAid states plainly it doesn't use your text to train its models and deletes submitted text after processing. Grammarly also pledges not to sell your content, but turns its own product-improvement training on by default (you can opt out).

Australian fit: 2/5 vs 2/5 — and why neither is a Top Pick

Both tools score 2/5 on Australian Fit, and they get there for the same reasons. Neither bills in AUD. Neither documents GST. Both host data on US servers with no Australian region. Neither has an Australian office, local support line or AU-specific hours. And both default to US (or, for ProWritingAid, British) English conventions rather than Australian spelling out of the box. These are global products that reflect zero investment in the local market — they work fine here, but they weren't built with Australians in mind.

Under our Australian Fit gate, a five-star rating and a category Top Pick both require an Australian Fit of at least 4/5. At 2/5, neither Grammarly nor ProWritingAid can be named our category Top Pick — though at 18/25 and 15/25 their raw totals sit in the four- and three-star bands regardless. Both are honest, capable tools; neither is the locally-built champion this category still lacks.

This comparison is general information, not professional advice. If you're handling regulated, legal or financial material, confirm data-handling and compliance requirements for your circumstances before committing.

Which to pick — decision framework

• You write emails, proposals, social posts and short business copy → Grammarly. It fixes writing in every box you type into, and the free tier proves itself before you pay.
• You write novels, screenplays or long, detailed reports → ProWritingAid. The 25+ reports and Chapter Critique do work Grammarly can't, and Scrivener support seals it for fiction.
• You write in Scrivener → ProWritingAid. Grammarly doesn't integrate with it; ProWritingAid is almost the only serious option.
• You want the lowest commitment and lowest monthly cost → Grammarly. About A$17/month on the annual plan, with a genuinely useful free tier to start on.
• You'll use the tool for years and want to pay once → ProWritingAid. The lifetime licence (about A$559) breaks even in just over three years and never charges again.
• You write mostly on a phone or tablet → Grammarly. It has a mobile keyboard; ProWritingAid has no app at all.
• You're in a regulated industry handling client or patient text → weigh both carefully. Both host data in the US with unconfirmed GST — verify your compliance obligations before either.

The verdict

Winner: Grammarly, for the typical Australian business writer. It scores 18/25 to ProWritingAid's 15, and for most people the reasons are practical. Grammarly follows you into every app, fixes writing as you type, drafts and re-tones with AI, runs on your phone, and asks almost nothing of you to get started. The free tier alone earns its place on your machine, and Pro at the annual rate — about A$17/month inclusive — is fair value. For email, proposals, CRM notes and the everyday writing most small businesses do, it's the easy, correct choice.

But ProWritingAid is the better tool the moment your writing gets long. If you produce novels, screenplays or detailed reports, its 25+ reports and Chapter Critique surface problems Grammarly's sentence-level checking never will, and its Scrivener integration makes it the default for serious fiction. Its lifetime licence — about A$614, paid once — is the standout-value option in this pair for anyone who'll use a writing tool for years. The honest framing: most Australians should start with Grammarly and may never need more; long-form writers should head straight for ProWritingAid and buy the annual plan, or the lifetime licence if they're in it for the long haul. Two good tools, separated not by quality but by the kind of writer you are — and both still waiting for the local fit this category lacks.

Frequently asked questions

Are Grammarly and ProWritingAid available in Australia?

Yes — both work in Australia. Grammarly runs as a browser extension, desktop app, mobile keyboard and Word add-in; ProWritingAid runs via browser extensions, desktop apps and integrations with Word, Google Docs, Scrivener and others. Neither has an Australian office or local support line, and both default to US or British English rather than Australian spelling.

Do they charge in AUD?

No. Grammarly bills in US dollars, with regional pricing in Euros, pounds and rupees only — not AUD. ProWritingAid is USD across the board. AUD figures are estimates: Grammarly Pro from about A$17/month ex-GST (US$12 annual) and ProWritingAid Premium from about A$168/year ex-GST (US$120 annual). Neither documents GST, so check your first invoice.

Which is cheaper, Grammarly or ProWritingAid?

It depends on how long you'll use it. Grammarly is cheaper month to month and lower commitment — about A$17/month on the annual plan. ProWritingAid is the cheaper destination if you stay for years: its one-off lifetime licence (about A$559) has no Grammarly equivalent and breaks even in just over three years.

Does ProWritingAid really have a lifetime licence?

Yes — and it's the key differentiator. ProWritingAid sells a one-off Premium lifetime licence for US$399 (about A$559) and a Premium Pro lifetime for US$699 (about A$979). You pay once and never again. Grammarly has no lifetime option; it's subscription-only.

Which is better for Australians?

Grammarly scores 18/25, ProWritingAid 15/25, and both score Australian Fit 2/5 — so under our Australian Fit gate neither can be the category Top Pick. Grammarly wins for everyday business writing and mobile work; ProWritingAid wins for long-form writing, Scrivener users and anyone who wants to pay once with the lifetime licence.

Read next

• Full reviews: Grammarly (18/25) and ProWritingAid (15/25)
• Head-to-head: Grammarly vs QuillBot
• How we score: Methodology

Sources

This comparison draws on The AI Directory Australia's underlying reviews of Grammarly (18/25, AU Fit 2/5) and ProWritingAid (15/25, AU Fit 2/5), each scored against our five-criteria framework and verified against the vendors' own pricing, product and security pages on 3 June 2026 (Grammarly) and 20 June 2026 (ProWritingAid). Grammarly's USD figures and ProWritingAid's USD figures — including the lifetime licence — are carried from those verified reviews. GST treatment is undocumented by both vendors; confirm at checkout. Star ratings and Top Pick eligibility follow our Australian Fit gate. USD-to-AUD estimates use ~1.40 shown ex-GST (a GST-registered business quoting its ABN is not charged GST on an imported digital service; other buyers add ~10%); neither vendor documents Australian GST. Wayback Machine snapshots queued.

The AI Directory Australia is an independent editorial publication. Read our Methodology and Affiliate Disclosure.

Synthesised from The AI Directory's verified Grammarly (3 June 2026) and ProWritingAid (20 June 2026) reviews. GST treatment remains unconfirmed for both — confirm live pricing before purchase.