Grammarly vs Lex

Grammarly

• People who write across many apps and want the same checks in each
• Teams of up to 149 that need a shared style guide and brand tone
• Students who want citation, plagiarism and AI-detection checks in one editor

Lex

• Writers who want AI feedback on a draft instead of generated text
• People looking for a simpler shared-document editor with AI built in
• Trying several AI models on the same piece without separate subscriptions

Grammarly

• The Free plan is capped at 100 AI prompts a month and leaves out full-sentence rewrites and tone adjustments.
• Pro costs $30 per member a month on monthly billing, against $12 a month when billed annually.
• Pro stops at 149 seats; larger organizations need Enterprise, which is priced through sales.
• Advanced grammar, clarity and tone suggestions cover six languages; the other supported languages get spelling and basic grammar only.

Lex

• Free accounts get 30 Ask Lex messages a day, 5 saved-prompt runs a month and a small daily AI budget; premium models need Lex Pro.
• Lex Pro's AI use is metered: the plan includes $30 of AI credits a month, and heavier use can be covered by overage credits sold at cost.
• Lex runs in a desktop or mobile browser. An iOS app is offered to Pro subscribers as early access, and no desktop app is listed.
• Track changes is marked as coming soon on the homepage.

Grammarly

Grammar, spelling and tone checks

Corrects spelling and grammar and shows the tone of a message on every plan. Full-sentence rewrites and one-click tone adjustments are part of Pro.

Works inside other apps

Desktop apps for Windows and Mac, extensions for Chrome, Safari, Firefox and Edge, and iPhone, iPad and Android apps bring suggestions into tools such as Gmail, Google Docs, Word and Slack.

Docs and AI agents

Docs is a browser-based document editor with agents including AI Grader, Citation Finder, Reader Reactions, Humanizer and Paraphraser. Some agents are limited to Pro.

Generative AI prompts

Drafts and reworks text from a prompt. The allowance is 100 prompts a month on Free, 2,000 per member on Pro and unlimited on Enterprise.

Plagiarism and AI detection

Scans a document for text that matches other sources and for passages likely to be AI-generated. The plans page lists both checks under Pro.

Team style controls

Pro team accounts get style guides, brand tones, knowledge share, snippets and usage analytics, so a group writes with the same terms and voice.

Lex

Ask Lex

A chat panel for feedback, rewrites and brainstorming on the open document. Highlighting text, or tagging @Lex in a comment, asks about one passage. The AI model can be switched.

Checks

Runs line edits for brevity, grammar, readability and more, shown as highlights in the document. Clicking one shows the suggested edit and the reason for it.

Custom prompts and context

Saved prompts can be reused in Ask Lex and Checks and shared with others. Style guides and knowledge bases give the AI a voice to follow and background to draw on.

Versions and Rewind

Versions are named save points for trying another approach. Rewind is a timeline at the top of a document for scrubbing through past changes and restoring an earlier state.

Live collaboration and comments

A shared link gives edit or view-only access, with co-editing in real time and comment threads. Lex Teams is a paid add-on for unlimited group use of shared folders.

Export and API

Documents export to Word, PDF, Markdown, HTML and LaTeX, and an API can create, list and update documents with a key generated in settings.

Grammarly

• Free$0

  Spelling and grammar corrections, tone detection and 100 AI prompts a month, for individuals.

• Pro$12

  per member / month, billed annually ($30 billed monthly)

  Full-sentence rewrites, tone adjustments, style guides and brand tones, and 2,000 AI prompts a month. Sold for 1 to 149 seats.

• EnterpriseCustom

  Unlimited members and AI prompts, dedicated support, confidential mode, granular roles and data loss prevention. Sold through Superhuman Go.

Lex

• Free$0

  Documents, sharing and live collaboration with 30 Ask Lex messages a day, 5 saved-prompt runs a month and a small daily AI budget.

• Lex Pro$14.99

  per month, billed yearly ($179.88); $24.99 billed monthly

  Premium AI models, $30 of included AI credits a month, much higher usage limits, priority support, early access to new features and a money-back guarantee.

Grammarly

• Annual discount

  Save up to 60% with yearly billing

  Pro is $12 per member a month when billed annually and $30 when billed monthly. The plan toggle advertises a saving of up to 60% on yearly billing.

• Education

  Discounts for educational institutions

  The plans page FAQ says Grammarly offers discounts for educational institutions. Grammarly for Education is quoted through its education sales team.

Lex

• Annual discount

  40% less with yearly billing

  Lex Pro billed yearly is $179.88, which works out to $14.99 a month against $24.99 when billed monthly.

• Education

  Discounted pricing for students and academics

  Lex says it offers discounted pricing for students and academics, arranged by emailing the company. The size of the discount is not published.

• Nonprofit

  Discounted pricing for nonprofits

  Lex says it offers discounted pricing for nonprofit organizations, arranged by emailing the company. The size of the discount is not published.