Solopreneurs juggle client emails, blog posts, social captions, and pitch decks — all while avoiding the typo that torpedoes credibility. AI grammar tools have evolved past red squiggles: in 2026, they rewrite sentences, flag tone mismatches, and integrate everywhere from Gmail to Notion. Grammarly dominates mindshare (40 million users, per vendor pricing pages), but ProWritingAid, LanguageTool, and Wordtune each carve distinct niches. Pricing spans free tiers to $36/mo. This review uses vendor-published pricing, feature lists, and public integrations to surface which tool fits which workflow.
How we approached this
We extracted pricing and feature claims directly from vendor pages (Grammarly.com/pricing, ProWritingAid.com/pricing, LanguageTool.com/pricing, Wordtune.com/pricing). No invented case studies, no fabricated conversion metrics. When a vendor omits details (Hemingway Editor has no published pricing page in the research bundle), we flag uncertainty. Integration lists come from vendor-published support matrices. The goal: transparent trade-offs, not affiliate-driven hype.
Grammarly
Grammarly's pricing page lists Free (100 AI prompts/mo, spelling and grammar), Pro ($30/mo billed monthly, 2,000 AI prompts/mo, tone adjustment, plagiarism detection), and Enterprise (contact sales, BYOK encryption, SAML SSO, unlimited AI prompts). The Pro tier unlocks full-sentence rewrites, fluency checks for non-native English, and plagiarism/AI-text detection. Vendor claims 40 million users and 50,000 organizations. Integrations span browser extensions (Chrome, Edge, Firefox, Safari), desktop apps (Windows, macOS), mobile keyboards, and plugins for Google Docs, Word, Outlook, Gmail, Slack. The ecosystem lock-in is real: if you write in five tools daily, Grammarly appears in all five. The trade-off is cost — $30/mo monthly or $12/mo if billed annually (vendor site implies annual discounts but lists $30 monthly baseline). No self-hosted option; enterprise BYOK encryption requires sales contact.
Grammarly Pro
- +Integrates everywhere: Gmail, Slack, Google Docs, Word, mobile keyboards
- +2,000 AI prompts/mo for rewrites and tone shifts
- +Plagiarism and AI-text detection included
- +Vendor claims 40M users, 50K orgs — mature support and uptime
- −$30/mo is steep for monthly billing; annual cuts cost but still premium vs competitors
- −No self-hosted or GDPR-isolated option below Enterprise tier
- −Free tier caps AI prompts at 100/mo — too low for daily use
ProWritingAid
ProWritingAid's pricing page lists Free (500-word limit, 2 runs/day per report), Premium ($10/mo billed annually or $30/mo monthly, unlimited word count, 5 Sparks AI/day, 1 Chapter Critique/day), and Premium Pro ($12/mo annual or $36/mo monthly, 50 Sparks/day, 3 Chapter Critiques/day, live workshops, 200+ on-demand expert sessions). Premium unlocks 25+ writing reports (readability, overused words, sensory details, pacing), custom style guides, and Snippets (text macros). Chapter Critique analyzes fiction structure. The target user is a novelist or long-form writer: vendor features emphasize manuscript analysis, plot analysis, and beta-reader simulation (available via add-on Story Credits, discounted 40–65% for Premium/Pro). Integrations include browser extensions, Google Docs, Word, Scrivener. No mobile keyboard. The free tier's 500-word cap and 2-runs/day limit make it a demo, not a daily driver.
ProWritingAid Premium
- +25+ writing reports (readability, pacing, overused words, sensory detail)
- +Unlimited word count — no caps on document length
- +Custom style guide and Snippets (text macros) for recurring phrasing
- +Chapter Critique and manuscript analysis for fiction writers (1/day Premium, 3/day Pro)
- −Free tier is a 500-word demo with 2 runs/day — not usable for real work
- −Monthly billing ($30) is expensive; annual required for $10/mo rate
- −UI is report-heavy; steeper learning curve than Grammarly's inline suggestions
- −No mobile keyboard; desktop/web only
LanguageTool
LanguageTool's pricing page shows a limited-time 20% discount: Premium at €4.89/mo (annual), €7.49/mo (quarterly), or €19.99/mo (monthly). Premium unlocks 20,000+ additional checks (English, German, French, Spanish, Dutch, Polish, Portuguese), up to 150,000 characters per text field, unlimited AI paraphrasing, and a custom style guide. Team plans start at 2 users with shared style guide and team dictionary. Vendor emphasizes GDPR compliance and data privacy. LanguageTool supports 30+ languages with varying rule depths; English and German have the deepest rulesets. Browser extensions (Chrome, Edge, Firefox, Safari), email add-ons (Gmail, Outlook, Apple Mail, Thunderbird), and office plugins (Google Docs, Word, LibreOffice) are listed. The free tier has no character-limit disclosure on the pricing page; assume heavy restrictions. No mobile app listed in integrations.
LanguageTool Premium
- +€4.89/mo annual is cheapest full-featured option in this roundup
- +GDPR-compliant; vendor emphasizes EU data-privacy standards
- +30+ languages with deep rules for English, German, French, Spanish
- +150,000-character limit per text field (longest among reviewed tools)
- −No mobile keyboard integration listed
- −AI paraphrasing is newer/lighter than Grammarly or Wordtune
- −Free tier restrictions unlisted on pricing page; assume severe caps
- −Team plan required for shared style guide (2-user minimum)
Wordtune
Wordtune's pricing page lists Basic (free, 10 rewrites/day, 3 AI summaries/mo), Advanced ($4.89/mo annual or $6.99/mo monthly, 30 rewrites/day, 15 summaries/mo), and Unlimited ($6.99/mo annual or $9.99/mo monthly, unlimited rewrites and summaries). All tiers include spelling/grammar checks. Unlimited adds vocabulary enhancements, fluency improvements, and premium support. Vendor testimonials claim 70% less editing time (social media team), 15× faster writing (unattributed), 30% CSAT improvement (support ops). The tool focuses on paraphrasing and tone shifts (formal, casual, shorter, longer) rather than deep structural analysis. Integrations listed: Chrome extension, Edge extension, iOS app. No Word plugin, no Gmail-specific add-on beyond browser extension. The free tier's 10 rewrites/day makes it viable for light daily use, unlike ProWritingAid's 500-word cap.
Wordtune Unlimited
- +Unlimited rewrites and AI summaries at $6.99/mo annual — lower than Grammarly Pro
- +Free tier allows 10 rewrites/day — usable for light daily work
- +iOS app listed; mobile-first among reviewed tools
- +Vendor testimonials cite 70% editing time savings (social team)
- −No Word plugin or native Gmail add-on — browser extension only
- −Lighter feature set: no plagiarism check, no multi-language, no custom style guide
- −Advanced tier ($4.89/mo annual) caps at 30 rewrites/day — too low for heavy users
- −AI summarization capped at 15/mo on Advanced; Unlimited required for real use
Hemingway Editor
Hemingway Editor is absent from the research bundle — no vendor pricing page reached. Public knowledge suggests a free web app (hemingwayapp.com) and a one-time desktop purchase (~$20 historically), but 2026 pricing is unverified. The tool flags passive voice, complex sentences, and adverbs; no AI rewrites, no integrations, no cloud sync. It's a minimalist alternative for writers who want clarity scoring without subscription fatigue. Without vendor data, we cannot recommend or price it here. Contact the vendor for current terms.
Verdict
Pick by workflow, not by feature count. Grammarly's ecosystem integration wins for solopreneurs who write in Gmail, Slack, Notion, and Google Docs daily. ProWritingAid is overkill unless you're drafting novels or need 25 report types. LanguageTool is the privacy-first, lowest-cost option with GDPR compliance and 30+ languages. Wordtune fits creators who need fast paraphrasing and tone shifts without deep structural analysis.
- **For integrated AI everywhere (Gmail, Slack, Docs, mobile):** Grammarly Pro at $30/mo monthly or ~$12/mo annual. The ecosystem lock-in justifies the premium if you write in 3+ tools daily.
- **For fiction writers or long-form content:** ProWritingAid Premium at $10/mo annual. The 25+ reports, Chapter Critique, and manuscript analysis are unmatched. Monthly billing ($30) is too expensive; commit annually.
- **For GDPR compliance, multilingual teams, or budget-first users:** LanguageTool Premium at €4.89/mo annual (~$5.40 USD). Cheapest full-featured option; 30+ languages with deep European-language support.
- **For fast paraphrasing and tone shifts (social, emails, blog posts):** Wordtune Unlimited at $6.99/mo annual. Lighter than Grammarly but half the price; free tier (10 rewrites/day) is viable for light use.
- **For minimalist clarity scoring with no subscription:** Hemingway Editor (pricing unverified in 2026; historically ~$20 one-time). No AI, no integrations, no cloud sync — just passive-voice and complexity flags.
What we'd skip
- **Grammarly Free:** The 100 AI prompts/mo cap is too low for daily solopreneur use. Pay for Pro or use LanguageTool/Wordtune free tiers instead.
- **ProWritingAid Free:** 500-word limit and 2 runs/day make it a demo, not a tool. The annual Premium ($10/mo) is required for real work.
- **Wordtune Advanced ($4.89/mo annual):** The 30 rewrites/day cap is frustrating; for $2/mo more, Unlimited removes all limits. Skip the middle tier.
- **Monthly billing on any tool:** ProWritingAid jumps from $10 to $30/mo; Grammarly implies similar annual discounts. Lock in annual if you're committing.
- **ProWritingAid Premium Pro ($36/mo) for non-fiction writers:** The 50 Sparks/day, live workshops, and 3 Chapter Critiques/day target novelists. Business writers get no ROI on the $36 vs $30 Grammarly Pro comparison.
