Grammarly

Grammarly is an AI writing assistant that runs as a browser extension, desktop app and add-in across the apps people already write in. It flags spelling, grammar and clarity mistakes, shows how a message's tone comes across, and on paid plans rewrites full sentences, adjusts tone, checks for plagiarism and detects AI-generated text. Generative AI prompts let users draft, rewrite and summarize text, with monthly prompt caps that depend on the plan. Since late 2025 Grammarly has belonged to the company now called Superhuman. That company sells Grammarly alongside Superhuman Mail and Coda, and includes the Superhuman Go assistant, which connects to Google Workspace and Microsoft Outlook. Pricing has three main tiers. Free has 100 AI prompts a month. Pro costs about 12 USD per member per month billed annually, or 30 USD on monthly billing, and includes 2,000 prompts per member a month, one style guide, one brand tone and team analytics, for up to 149 members. Enterprise is custom-priced and adds SAML SSO, SCIM, data loss prevention, bring-your-own-key encryption, an audit logs API and unlimited style guides. Grammarly suits teams that mainly polish and standardize everyday writing such as email, documents and support replies. It is not a general-purpose chatbot or an automation platform. Its main limitations are billing friction, with annual prepayment, auto-renewal and limited refunds, along with suggestion pop-ups that some users find intrusive.