Grammarly
Free tierAI writing assistant that catches grammar errors and improves clarity in real time.
Free tier available·Non-technical·Powered by Grammarly
Key strengths
grammar + spellingtone detectionplagiarism checkbrowser extension
Free tier + paid plans · from $12 USD/mo
San Francisco, US
Founded 2009
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Grammarly offers a browser extension, desktop app, and API (enterprise). The real-time suggestions run a custom NLP pipeline trained on billions of sentences. The API (Grammarly Text Editor SDK) allows embedding Grammarly suggestions into any web textarea. GrammarlyGO (generative AI) uses an LLM for rewriting and tone adjustment.