LanguageTool vs ProWritingAid: pricing, features and which to choose

LanguageTool is a grammar, spelling, punctuation, style, and paraphrasing service that began as Daniel Naber’s computational-linguistics diploma project in 2003. It later became commercial and Learneo acquired it on April 5, 2023, for undisclosed financial terms. LanguageTool says its browser add-on has more than 2 million active installations, serves more than 150 companies, and improves more than 20 million texts daily. These figures are company claims. The product supports more than 30 languages and remains separate from Learneo’s other writing brands. Its open-source core can run locally or in the cloud. Hosted Premium and AI features are commercial services, giving users a choice between self-managed checking and expanded hosted capabilities for writing, editing, and paraphrasing.

A typical LanguageTool workflow begins in a browser extension, desktop application, mobile application, supported word processor, or the LanguageTool editor. The service identifies spelling, grammar, punctuation, word choice, style, typography, and some contextual issues, then offers suggestions users may accept or reject. Premium adds more than 20,000 additional checks for several major languages, a personal style guide, text statistics, larger fields, and unlimited sentence paraphrasing. Teams add user management, shared style guidance, and a shared dictionary. Developers can submit text through the HTTP API, while organizations can request a commercial API or run the server themselves. This range makes the product applicable to individual writing, managed team workflows, and developer integrations requiring programmatic checking.

LanguageTool suits multilingual checking, open-source deployment, and writing through browsers or word processors. Grammarly is the closer consumer comparison, emphasizing English rewriting and business administration, while QuillBot focuses more heavily on paraphrasing. Microsoft Editor is convenient for Microsoft 365 users, but LanguageTool provides a self-hostable core and public checking API. The public API permits 20 requests per IP per minute, 75 KB of text per IP per minute, and 20 KB per request, while automated requests are prohibited. LanguageTool is therefore most suitable when language coverage, deployment control, or local hosting matters more than a larger proprietary suite. Users needing heavy automated traffic should note the public limits and consider the commercial API or self-hosting instead.

ProWritingAid began in London in 2013 after founder Chris Banks built software to help with a novel. The company says it remains independent and has taken no venture capital. It now says the service helps millions of creative and business writers around the world. Its stated audience includes novelists, business writers, teachers, students, and English-language learners. The product has expanded beyond spelling and grammar into a writer’s toolkit covering planning, drafting, line editing, story critique, and publishing preparation. Its central identity is a writing assistant that combines detailed diagnostics with story-focused feedback, while leaving decisions about revisions to the writer. The company presents storytelling, practice, and feedback as central to its approach.

A typical workflow can begin in the Web Editor, where users upload or paste a document, or through Desktop Everywhere for Windows or Mac. Browser extensions for Chrome, Edge, and Firefox provide access on websites and webpages, while integrations include Microsoft Word, Google Docs, Scrivener, Apple Notes, Notion, Apple Pages, and Atticus. Reports cover grammar, spelling, punctuation, style, readability, sentence structure, sentence length, repetition, consistency, clichés, dialogue, pacing, sensory detail, and word choice. Rephrase offers alternative wording, Word Explorer and Thesaurus support word selection, and customizable settings let users manage terminology and preferred rules. Story tools include Story Canvas, Chapter Critique, Manuscript Analysis, Plot Analysis, Character Analysis, Virtual Beta Reader, and Marketability Analysis.

ProWritingAid suits writers who want extensive manuscript diagnostics and story feedback, though its many reports can require time, interpretation, and editorial judgment. It is less suitable for people wanting only a minimal correction layer, a general-purpose text generator, or primary support for languages other than English. Grammarly is a closer editorial fit for everyday workplace correction, LanguageTool for multilingual checking, and AutoCrit for fiction-focused manuscript work. ProWritingAid says analyzed text is deleted after processing, except documents explicitly saved in its encrypted Web Editor, and says customer writing is not used to train its models. Its AI documentation also says users retain rights to their writing, while publishers, schools, contests, and clients may set their own AI-use rules. Pick it when report depth and story-level feedback matter most.