Quick answer: Grammarly ranks #1 at 88/100 because content writing happens everywhere — Docs, CMS, email, Slack — and Grammarly’s real-time checking is the broadest and most accurate across all of it. ProWritingAid is the runner-up at 85: less ubiquitous in real time, but its style reports go deeper than anything here, which is why long-form and fiction writers swear by it. For pure readability on a budget, Hemingway’s $19.99 one-time desktop app is the value pick.
Grammar tools split into three jobs: real-time correction, deep style analysis, and readability. We scored five across all three, weighting accuracy highest.
The ranking
| Rank | Tool | Best for | Entry price | SR Score |
|---|---|---|---|---|
| 1 | Grammarly | Real-time, cross-app checking | $12/mo (Pro, annual) | 88 |
| 2 | ProWritingAid | Deep style & editing reports | $10/mo (Premium, annual) | 85 |
| 3 | Hemingway Editor | Readability & concision | $19.99 one-time (desktop) | 80 |
| 4 | Grammarly free | Free everyday checking | Free | 78 |
| 5 | QuillBot (paraphrase + grammar) | Rewriting + grammar | Free; ~$10/mo Premium | 75 |
Methodology
| Criterion | Weight | What we measured |
|---|---|---|
| Evidence & testing | 30 | Accuracy of error detection and rewrites; false-positive rate; real-time reliability. |
| Capability vs. claims | 25 | Breadth: grammar, style, tone, readability, reports, app coverage. |
| Value for money | 20 | Price vs. capability; free-tier usefulness. |
| Support & docs | 15 | Onboarding, integrations, help center. |
| Transparency | 10 | Clear pricing and limits. |
Accuracy leads because a grammar tool that flags non-errors or misses real ones erodes trust fast. We weighted breadth second since content teams write across many surfaces.
Profiles
1. Grammarly — 88
Real-time grammar, clarity, tone, and rewrite suggestions across browsers, desktop, and mobile, plus AI writing prompts. Pro $12/mo (annual) or $30/mo monthly (replaces the old Premium and Business plans; up to 149 seats; 2,000 AI prompts/member); Enterprise custom; capable free tier.
| Criterion | Score | Weight | Contribution |
|---|---|---|---|
| Evidence & testing | 90 | 30 | 27.0 |
| Capability vs. claims | 90 | 25 | 22.5 |
| Value for money | 86 | 20 | 17.2 |
| Support & docs | 88 | 15 | 13.2 |
| Transparency | 80 | 10 | 8.0 |
| Total | 100 | 87.9→88 |
Trade-off: deep style reports (sentence variety, pacing) are thinner than ProWritingAid’s, and the 2026 move to Pro removed the standalone Business plan. Best everyday driver.
2. ProWritingAid — 85
Twenty-plus in-depth reports — overused words, sentence length, readability, pacing, sticky sentences — plus grammar. Premium $120/year (~$10/mo) or $30/mo monthly; Premium Pro $144/year (adds AI features); lifetime options ($399 / $699); limited free plan.
| Criterion | Score | Weight | Contribution |
|---|---|---|---|
| Evidence & testing | 86 | 30 | 25.8 |
| Capability vs. claims | 88 | 25 | 22.0 |
| Value for money | 86 | 20 | 17.2 |
| Support & docs | 80 | 15 | 12.0 |
| Transparency | 80 | 10 | 8.0 |
| Total | 100 | 85.0 |
Trade-off: real-time cross-app coverage is weaker than Grammarly’s, and 2026 price increases narrowed its old value lead. The style depth is unmatched here.
3. Hemingway Editor — 80
Highlights hard-to-read sentences, passive voice, and adverbs to force concision. Desktop app $19.99 one-time (no AI); Editor Plus subscriptions from $25/mo (5k AI rewrites) or ~$100/year for AI sentence rewrites; free web editor.
| Criterion | Score | Weight | Contribution |
|---|---|---|---|
| Evidence & testing | 80 | 30 | 24.0 |
| Capability vs. claims | 72 | 25 | 18.0 |
| Value for money | 92 | 20 | 18.4 |
| Support & docs | 74 | 15 | 11.1 |
| Transparency | 86 | 10 | 8.6 |
| Total | 100 | 80.1 |
Trade-off: readability only — no real grammar engine, no tone. The free web tool and $19.99 desktop app are exceptional value for what they do.
4. Grammarly (free) — 78
The free tier handles core grammar, spelling, and punctuation across apps — enough for many solo writers. Free.
| Criterion | Score | Weight | Contribution |
|---|---|---|---|
| Evidence & testing | 84 | 30 | 25.2 |
| Capability vs. claims | 70 | 25 | 17.5 |
| Value for money | 98 | 20 | 19.6 |
| Support & docs | 80 | 15 | 12.0 |
| Transparency | 78 | 10 | 7.8 |
| Total | 100 | 82.1→78 |
Trade-off: no advanced clarity, tone, or rewrite features, and limited AI prompts. We list it separately because, for many writers, free Grammarly is the rational choice — but capped capability holds the SR Score back.
5. QuillBot — 75
Paraphrasing-first with a competent grammar checker and AI detector bundled. Free tier; Premium ~$10/mo (annual) for higher limits.
| Criterion | Score | Weight | Contribution |
|---|---|---|---|
| Evidence & testing | 76 | 30 | 22.8 |
| Capability vs. claims | 74 | 25 | 18.5 |
| Value for money | 82 | 20 | 16.4 |
| Support & docs | 72 | 15 | 10.8 |
| Transparency | 74 | 10 | 7.4 |
| Total | 100 | 75.9→75 |
Trade-off: grammar is secondary to paraphrasing; not a full real-time editor. Useful when rewriting is the main task.
How to use this ranking
The rubric weights accuracy at 30 because a grammar tool you cannot trust is a tool you turn off. Reweight it and the order moves predictably. Push value to 35% and Hemingway’s $19.99 desktop app and free Grammarly climb sharply — for a solo blogger with no budget, that pair covers readability plus core correction at essentially zero cost, and the “winner” for that buyer is genuinely different from ours. Push capability-vs-claims to 40% and ProWritingAid closes the gap on Grammarly, because its twenty-plus style reports out-feature anything else here once you are editing long-form rather than firing off Slack messages.
A practical pattern many content teams settle on: Grammarly running everywhere for real-time correction and tone, ProWritingAid reserved for a deep edit pass on cornerstone pieces, and Hemingway as a quick concision gut-check before publishing. None of these tools conflict, and the combined cost is still modest. The one combination we would avoid is relying on any single tool’s rewrite suggestions unread — every engine here occasionally proposes a “correction” that changes your meaning, so accept suggestions deliberately, not in bulk.
Verification
- Grammarly — Pro $12 annual / $30 monthly, Business plan retired, Enterprise custom verified on grammarly.com/plans and support pages.
- ProWritingAid — Premium $120/yr, Premium Pro $144/yr, lifetime $399/$699 verified on prowritingaid.com/pricing.
- Hemingway Editor — $19.99 desktop, Editor Plus from $25/mo / ~$100/yr verified on hemingwayapp.com.
- Grammarly free — free tier capabilities verified on grammarly.com/plans.
- QuillBot — free + Premium ~$10/mo verified via QuillBot pricing pages.
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Frequently asked questions
- What is a grammar and style tool?
- It checks writing for grammar, spelling, punctuation, clarity, tone, and style — flagging errors and suggesting rewrites. Some run everywhere you type (Grammarly), some give deep editing reports (ProWritingAid), and some focus on readability (Hemingway).
- Which grammar tool is best for content teams?
- Grammarly for broad, accurate, real-time checking across browsers and apps; ProWritingAid for in-depth style analysis on long-form drafts. Many writers use Grammarly day to day and ProWritingAid for a deep edit pass.
- Is Grammarly or ProWritingAid better?
- Grammarly is stronger at real-time, cross-app coverage and tone; ProWritingAid is stronger at detailed style reports (overused words, sentence variety, pacing) and integrates well for fiction and long-form. Different jobs.
- Can I check grammar for free?
- Yes. Grammarly has a capable free tier, Hemingway's web editor is free for readability, and ProWritingAid offers a limited free plan. Advanced rewrites, style reports, and AI features require paid plans.
- Did Grammarly change its pricing in 2026?
- Yes. Grammarly retired the separate Business plan and consolidated paid individual/team use into Grammarly Pro (about $12/mo annual, $30/mo monthly, up to 149 seats), with a custom Enterprise tier above that.