DeepL vs Grammarly

DeepL is a machine translation service from DeepL, a company based in Cologne, Germany, that grew out of the Linguee online dictionary and launched its translator in 2017. It is known for output that reads more naturally and keeps nuance better than many competitors, especially for European languages, and it supports Turkish among its 30+ languages.

Users translate text in the browser, desktop and mobile apps, or whole documents such as Word, PowerPoint and PDF files while keeping their formatting. Glossaries enforce company terminology, formality settings switch between formal and informal tone in languages that distinguish them, and DeepL Write rephrases and corrects text to improve grammar and style. DeepL Voice brings real-time speech translation to conversations and meetings. Businesses integrate the DeepL API into websites, apps, CMSs and support tools, and many localization platforms such as Crowdin, Lokalise and Weglot use DeepL as a translation engine. A free tier has character and document limits, while the per-user Individual, Team and Business plans raise character and file limits and add CAT tool integration and data security guarantees.

DeepL fits professionals, translators and companies that need high-quality drafts quickly, particularly in Europe where its German base and data handling help with compliance. Its language coverage remains narrower than Google Translate, which is better for rare languages and free large-scale use. Large language models are now a serious alternative for context-aware translation.

Grammarly is an AI writing assistant founded in 2009 in Kyiv, Ukraine, by Max Lytvyn, Alex Shevchenko and Dmytro Lider, now headquartered in San Francisco. It works wherever people write, through browser extensions, desktop apps for Windows and Mac, mobile keyboards and integrations with tools such as Google Docs, Microsoft Word and Outlook, checking text in real time as you type.

Beyond spelling and grammar, Grammarly flags clarity, conciseness, tone and engagement issues, rewrites whole sentences, adjusts formality, checks plagiarism and citations, and generates or edits text with AI prompts and agents. Business plans add company style guides, brand tones, snippets for reusable text, analytics and SSO. The free plan covers core corrections and a limited number of AI prompts; Pro adds full rewrites and more AI usage; Enterprise adds admin controls and security reviews.

After acquiring Coda in late 2024 and the email client Superhuman in 2025, the company began building a broader AI productivity suite, and in late 2025 it adopted the Superhuman name for the company while keeping Grammarly as a product brand. Grammarly remains strongest in English; in September 2025 it added beta support for Spanish, French, German, Italian and Portuguese, but Turkish is not among the supported writing languages. AI features built into Google Docs and Microsoft 365 cover basics for many users, and QuillBot is a popular, cheaper option for paraphrasing.