Reviewers have praised Grammarly for its ease of use and helpful suggestions, considering it worthwhile despite its relatively high price and lack of offline functionality. The software can generate and re-write content based on prompts. In April 2023, Grammarly launched a beta-stage product using generative AI called Grammarly GO, built on the GPT-3 large language models. It also provided free access to Ukrainian media, which reported on the war in English. The company also announced that it would donate the net revenue earned in Russia and Belarus since 2014 to Ukraine. Grammarly effectively severed all business relations with users in Russia and Belarus in response to the 2022 Russian invasion of Ukraine.

Later in December, Grammarly launched a bug bounty program on HackerOne, offering a US$100,000 reward to the first white hat hacker to access a specific document on the company's server.

Within a few hours, the company released a hotfix and reported that it found no evidence of compromised user data.

In early 2018, a security researcher at Google discovered a vulnerability in Grammarly's browser extension beta version, which exposed authentication tokens to websites and potentially allowed them to access the users' documents and other data. It was later offered to the end customers who use English in everyday life. Grammarly was initially designed as an educational app to help university students improve their English skills. Grammarly was founded by Max Lytvyn, Alex Shevchenko, and Dmytro Lider, the creators of My Dropbox, an app that checks essays for plagiarism. Grammarly is developed by Grammarly Inc., with hubs in San Francisco, California, and offices in Kyiv, New York City, Vancouver, and Berlin. Grammarly is available as a standalone application for use with desktop programs, a browser extension optimized for Google Docs, and a smartphone keyboard. Grammarly was launched in 2009 by Alex Shevchenko, Max Lytvyn, and Dmytro Lider. It also allows users to customize their style, tone, and context-specific language. It reviews spelling, grammar, punctuation, clarity, engagement, and delivery mistakes in English texts, detects plagiarism, and suggests replacements for the identified errors. Grammarly is an American cloud-based typing assistant. Online text editor, browser extension, and mobile app with grammar checker, spell checker, and plagiarism detector

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