Grammarly vs ProWritingAid: pricing, features and which to choose

Grammarly is a writing-assistance product made by Superhuman, the company formerly known as Grammarly. The company says Grammarly was founded in 2009 and serves more than 40 million people and 50,000 organizations. On October 29, 2025, it announced a name change to Superhuman while retaining Grammarly, Coda, Mail, and Superhuman Go as products in the broader suite. Grammarly therefore remains focused on writing support rather than becoming a separate foundation-model vendor. In May 2025, the company announced $1 billion in growth financing from General Catalyst and said revenue had exceeded $700 million. It also announced Coda’s acquisition in January 2025 and an agreement to acquire Superhuman in July 2025, placing Grammarly inside a larger product family.

Grammarly works inside supported applications, websites, browsers, and documents. A typical session involves writing text, reviewing inline spelling and grammar suggestions, and applying recommendations for tone, clarity, fluency, inclusive language, or citation consistency when the plan supports those capabilities. Pro adds full-sentence rewrites, tone adjustment, plagiarism detection, and AI-generated-text detection. Team features include style guides, brand tones, knowledge sharing, snippets, and analytics, helping organizations make writing more consistent. Grammarly says the product works across more than 1 million applications and websites. Docs provides a dedicated writing space, while newer agents can help users draft, revise, research, and receive audience feedback without opening a separate application. This broad coverage is central to its everyday writing-assistance approach.

The main limitation is the need to allow an AI service into many writing contexts. For individual accounts, Product Improvement and Training is enabled by default, although users can opt out. Microsoft Editor and Copilot fit organizations centered on Microsoft 365, while Google Docs with Gemini fits teams working mainly in Google Workspace. LanguageTool and ProWritingAid focus more narrowly on correction and style assistance. Grammarly is a strong choice for people who want correction, rewriting, tone guidance, detection features, and broad application coverage in one service. However, organizations should review account controls and content policies before using it for confidential work. Users seeking an open-source or self-hosted checker may also find Grammarly unsuitable, since the profile identifies it as neither.

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.