Tools to support writing

Tools for correction, paraphrasing, or translation are now a common part of both academic writing in a second language and everyday writing. This guide provides a list of tools categorized by their primary purposes selected based on quality and accessibility. Each tool listed has been evaluated using several criteria: main features, price, limitations, extensions, interface, and safety, with additional notes on other important functionalities.

Since language tools are continuously evolving, much of the information here may change in the future. However, everything provided is up-to-date (August 2025).

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What is this guide for, and how to use it?

This guide has three main sections grouped according to purpose of the tools:

Academic Writing: tools suited to the specific needs of students, scholars, and researchers.
Everyday Writing: tools that help with quick corrections (e.g., writing an email).
Multilingual Users: tools designed for writing in a second language; they usually let you choose from many different languages.

What is the difference between tools designed to enhance language and chatbots such as ChatGPT or Gemini?

Tools listed here were purposefully designed primarily to correct grammar and enhance language; suggested edits are precise and conservative. Many of these tools include an editor that flags issues as you type and clearly tracks all changes. These tools tend to be less “risky” than chatbots because they typically produce fewer hallucinations and unintended rewrites.

Research with artificial intelligence (AI) ↓

As artificial intelligence becomes more and more part of the writing process, some standards and processes should be followed when conducting research with AI. These depend on what you are researching, your audience, and which tools you used in your work. If you would like to learn more about how AI can be useful in the research process, refer to our guide.

Ethical aspects of writing with language grammar correctors and AI

Before you use such tools, always check your institution’s (or publisher’s) guidelines, which may specify various AI use policies. For example, some institutions allow students to use tools for grammar corrections without having to cite them, since they are considered common in formal text correction. If, however, the tool changes the content of a work, it is usually necessary to acknowledge you used the tool. In some cases, using such tools may even be prohibited.

Quillbot

Main features: grammar correction (in e.g., English, German, French, Spanish) is reliable, even in the free version.

Price: Basic features are free; advanced features require a subscription.

Limitations of the free version: limited number of corrections.

Advanced features: text summarizing, paraphrasing, translation to multiple languages, and AI Chat.

Extension: for Chrome, Edge, Safari, Word, application for Android, iOS, Windows, macOS.

Interface: user-friendly and clean interface. You can create an account to save your content.

Safety: regularly updated and data aren’t sold.

Other: suggests corrections depending on the type of text (e.g., research paper).

PaperRater

Main features: grammar corrections.

Price: freemium.

Limitations of the free version: limited number of characters.

Advanced features: explains grammar and stylistic mistakes, shows statistics, and offers tips for writing.

Extension: none.

Interface: clean English language interface. After uploading a text, users are redirected to an even more user-friendly page.

Safety: collects user data to provide and secure its services, sharing information across its platforms and with third parties to meet legal and business needs.

Other: users can upload entire documents.

Trinka

Main features: grammar correction; created exclusively for academic and technical writing focused on English and Spanish.

Price: freemium.

Limitations of the free version: limited number of credits are provided, renewable every month.

Advanced features: "Citation Formatter", "Plagiarism Checker", "AI Content Detector", "Citation Checker", "Journal Finder", "LaTeX Proofreader".

Extension: app for Windows – beta version, Word add-on, browser plugins.

Interface: you can create an account; very user-friendly; Grammarly's interface ads can be switched to Spanish, Simplified Chinese, and Japanese.

Safety: regular updates (including plugins), places great emphasis on data security and user privacy: declares that data aren’t used to train AI, doesn’t share data with third parties, has its own language model for grammar and spelling corrections. (Trinka doesn’t use generative AI as ChatGPT).

Other: you can create your own dictionary of words to create a personalized dictionary.

Grammarly

Main features: grammar correction, basic grammar and spelling checking, tone tracking (limited).

Price: freemium.

Limitations of the free version: does not include advanced features such as plagiarism check, advanced style suggestions, sentence variety, and a more detailed tone check. Does not detect all nuances and more complex stylistic errors.

Advanced features: advanced grammar, spelling, and punctuation checks; suggestions for improving vocabulary, tone correction, rewriting entire sentences; plagiarism detection and AI-generated text, genre-specific writing suggestions.

Extension: apps for Windows, macOS, free browser extensions (Chrome, Firefox, Edge, Safari) of great quality.

Interface: English interface. Users must register and log in using an email or Google/Facebook account for the free version; user-friendly, integration with browsers and desktop applications, suggestions are displayed directly in the text, and ads are not displayed in the free version.

Safety: strict privacy protocols: does not use text to train its AI models (unless user consents) and does not sell data to third parties, constantly updates and improves.

Other: generating text with AI prompts.

SentenceCheckup

Main features: English grammar correction.

Price: free.

Limitations of the free version: not suitable for long texts (i.e., website is not customized for these).

Advanced features: “Sentence Rewriter,” “Sentence Counter,” “Sentence Shortener,” and more.

Extension: none

Interface: only English language interface; sometimes pop-up ads.

Safety: doesn’t store inserted text and doesn’t share the data with third parties. Regularly updated.

Other: deep check feature, which redirects users to Grammarly.

Typli

Main features: online content creation and SEO optimization tool, text generation, text rewriting and expansion, plagiarism check, text proofreading, keyword analysis, competitor analysis, text optimization for SEO, and content structure suggestions.

Price: freemium.

Limitations of the free version: daily limit for suggestions/summarizations per day.

Advanced features: unlimited transcriptions and AI suggestions, unlimited summarization, vocabulary and clarity improvements, fluency, priority support, business plans, multiple languages, advanced SEO tools.

Extension: none.

Interface: no need to log in, intuitive and logically organized, no ads.

Safety: data encrypted during transmission, uses secure servers, is updated regularly.

Other: has a strong focus and optimization for Czech and Slovak languages/markets; is trained on Czech and Slovak data.

Scribbens

Main features: reliable grammar correction in many languages.

Price: freemium. The free version is sufficient for corrections. The paid subscription offers advanced features (i.e, paraphrasing tone).

Limitations of the free version: limited number of paraphrases and summaries.

Advanced features: paraphrasing, summarizing, and a dictionary connected to Wiktionary.

Extension: MS Office 365, search engines, desktop apps for Windows and macOS.

Interface: user-friendly, simple. You can choose the interface language.

Safety: data aren’t stored long-term.

Other: grammar correction offers not only the correct form, but also an explanation.

DeepL

Main features: DeepL Write provides grammar corrections (not only in English, but also in German, French, and more) and text summarization. DeepL Translate: translation up to 35 languages.

Price: freemium. The free version for both DeepL Write and Translate is limited. DeepL also offers a range of subscriptions.

Limitations of the free version: up to 2,000 characters altogether in the free version.

Advanced features: DeepL Write allows you to choose style and tone. The tool also offers a Glossary.

Extension: MS Office 365, search engines, desktop apps for Windows and macOS.

Interface: clean, simple; you can change the interface language.

Safety: regularly updated and has strong data policies.

CorrectorApp

Main features: grammar and spelling correction, multilingual support, allows you to check text in different languages, and no registration is required.

Price: free.

Limitations of the free version: 15,000 characters that can be corrected at once. CorrectorApp does not offer a subscription version since it focuses only on basic grammatical and spelling errors.

Advanced features: none.

Extension: offers extensions for web browsers (Chrome, Firefox).

Interface: the tool is free to use, and the interface is very user-friendly. However, because it's a free tool, ads are shown quite often. The interface is available in several languages (English, Spanish, French), and you can correct texts in more than 25 different languages.

Safety: updated regularly, but the exact date of the latest update is not available.

Other: the tool is suitable for users writing in different languages.

WordTune

Main features: grammar correction, rewriting, and improving text for a more natural sound. Not just a grammar corrector, but an assistant that helps formulate thoughts.

Price: freemium.

Limitations of the free version: a set daily limit applies to Rewrites and AI content generation suggestions and summaries; no limit: grammar and spelling corrections.

Advanced features: rewriting, style selection, text expansion, text narrowing, and synonyms.

Extension: Browser extensions (Google Chrome, Mozilla Firefox, and Microsoft Edge), online web app (Editor), add-in for Microsoft Office, and mobile applications.

Interface: must register and log in using email or Google/Facebook, an intuitive interface, no ads in the free version, can transcribe texts in other languages (over 20 languages), and the interface is in English.

Safety: the tool anonymizes user inputs and do not use them to train their AI models in a way that would violate privacy. Regularly updated.

Other: the tool is suitable for users writing in different languages.