Grammarly vs LanguageTool: English Depth or 30-Language Coverage?

For a team whose most consequential writing is in English, Grammarly is the stronger first candidate for advanced grammar, tone and rewriting tools. For a team publishing directly in a wider mix of languages, LanguageTool is the stronger first candidate: its business offering covers more than 30 languages and includes shared terminology and style rules. Neither choice should rest on language count alone; the deciding questions are which corrections staff need, where they write and which controls their plan includes.

Grammarly is also multilingual. Its language guide distinguishes basic corrections from advanced suggestions: spelling and basic grammar support extends across its supported languages, while advanced grammar, clarity, fluency, tone and paragraph rewrites are available in English, Spanish, French, German, Portuguese and Italian. A team writing mainly in English and French may value that depth. A team publishing in many other languages should check the assistance available in each one.

Match language coverage to where people write

The relevant unit of comparison is a language in a particular workflow, not a product-wide language total. A support team may need quick corrections inside email, while regional marketers may need consistent terminology in longer documents. A language can be supported for spelling without offering the same help with tone, clarity or paragraph structure. That distinction matters when a manager expects one subscription to produce a consistent editorial standard across markets.

Both products reach beyond their own editors, but their routes differ. Grammarly offers browser and desktop tools, Google Docs, Microsoft Office and mobile options. LanguageTool offers browser and email add-ons, Google Docs, Word, LibreOffice and desktop apps. A team should map its main writing surfaces to the specific features available there: a shared rule that works in an editor is less useful if writers do most customer-facing work in an add-on where it is unavailable.

Mobile work deserves separate attention. The availability and depth of language support can vary by device, so a team that sends customer replies from phones should include those messages in its comparison. The same applies to mixed-language documents: automatic language detection is convenient, but the useful question is whether suggestions remain appropriate as writers switch languages or use local names and specialist terms.

What the published correction figures can tell you

In a 2020 comparison using 500 erroneous English sentences, Grammarly’s free web interface had the highest overall accuracy at 44.4%, while LanguageTool’s free web interface led the tested tools on sentence-structure errors at 11%. Those figures describe older free versions in a controlled English exercise, not current paid team plans or multilingual performance.

The scoring method was stricter than merely noticing an error. A suggestion counted as correct when accepting it produced a sentence matching an approved correction. The test sentences came from grammar and learning materials, with error types deliberately distributed across the set. That makes the results useful for seeing how sharply performance varied by error type, but a poor forecast for a team’s own emails, policy copy or regional campaigns.

A current buying decision needs matched passages from the work the team actually produces. Give both paid configurations the same English passages, then add passages originally written in each publishing language. Include simple errors, difficult sentence structure, approved product names and sentences where an apparently smoother rewrite changes the intended meaning. Proficient reviewers can record useful corrections, missed errors and harmful suggestions separately; this is an evaluation design, not a claim that either current product has been newly tested here.

Policy matrix: editorial rules and administrative control

Correction quality is only part of team governance. Grammarly’s plan comparison assigns one style guide and one brand tone to Pro and unlimited versions to Enterprise; it also lists SAML single sign-on, SCIM provisioning, application controls and data loss prevention among its security features. LanguageTool’s business offering includes a Team Dictionary, shared Style Guide, user roles and a business data-processing agreement. The exact plan entitlement matters more than the mere presence of a feature on a product page.

• Dictionary: LanguageTool’s shared dictionary is designed to stop approved names and specialist terms being flagged as errors. For either product, establish who can add entries and whether the same vocabulary reaches everyone who writes for the brand.
• Style guide: Both products offer shared writing rules. If several brands or regions need different policies, check how rules are separated, assigned and maintained; Grammarly Pro’s guide allocation may become a constraint before seat count does.
• SSO and provisioning: User roles, single sign-on and automated account removal solve different problems. Confirm the SAML and SCIM entitlements in the proposed contract and test what happens when a writer joins, changes teams or leaves.
• Data handling: Review which text is sent for checking, how long it is retained, who can administer the service and whether sensitive applications or domains can be excluded. A data-processing agreement and security feature list are starting points for reviewing the actual deployment terms.

This matrix prevents an editorial feature from standing in for an IT requirement. A shared style guide helps writers follow approved wording; it does not establish how accounts are provisioned or what happens to sensitive text. Conversely, identity controls do not tell an editor whether the assistant can enforce a regional term in the language where it is needed.

Compare the cost of the plan you would deploy

Grammarly’s Pro pricing page lists $144 per member per year on an annual subscription and allows up to 149 seats. Extra seats are charged separately on a prorated basis, while Enterprise requires a sales conversation. The published Pro rate is a useful budget input only if that plan contains the controls the team requires.

For LanguageTool, obtain a team quote covering the same seats, billing period, currencies, integrations and administration requirements before comparing totals. A lower apparent seat price loses its meaning if the needed governance sits in a different agreement. Choose Grammarly first when advanced editing in English and its other supported advanced languages carries the most weight; choose LanguageTool first when broad multilingual correction and shared terminology carry more weight. Keep human review for consequential copy, and let matched passages and the actual contract settle the close cases.