Grammarly
Catch grammar and clarity issues as you write, then let built-in AI agents draft, rewrite, and complete tasks across your apps. Grammarly's parent company rebranded to Superhuman in October 2025.
Best For
Catching grammar and clarity issues in real time as you write anywhere online
Standout Feature
Built-in AI agents now draft and rewrite across your apps, not just proofread
Verdict
The baseline writing check most people should already have running.
Alternatives
Overview
Grammarly is a widely deployed AI writing assistant for real-time clarity and correctness improvements, active across email clients, browsers, document editors, and development environments through browser extensions and native integrations. Its core product has evolved well beyond spell-check: the AI analyzes writing for clarity, conciseness, tone, engagement, and delivery effectiveness, offering specific rewrites rather than vague suggestions. The Tone Detector identifies how a piece is likely to land with readers, formal, friendly, apologetic, confident, enabling intentional adjustments before sending.
Grammarly Business adds a centralized Style Guide that enforces organization-specific vocabulary, banned phrases, and formatting rules across all team communications, ensuring consistency at scale. The premium tier ($12/month) adds the full suite of tone, clarity, and engagement suggestions beyond basic grammar correction. For professionals who write extensively, client-facing emails, reports, proposals, support communications, Grammarly's browser-level integration means these improvements apply everywhere you write without changing your workflow.
Its primary limitation is that it excels at polishing existing writing rather than generating new content, which keeps it complementary to rather than competitive with generation-focused AI tools.
Key Features
- Grammar and spelling checks
- Tone detection
- Plagiarism checker
- Generative AI co-creator
- Browser extension
- • Works everywhere you write
- • Highly accurate suggestions
- • Improves overall writing quality
- • Generative features are helpful
- • Premium plan is somewhat pricey
- • Can be overly pedantic
- • Generative features are basic compared to ChatGPT
People Also Use
Other Writing tools builders reach for alongside Grammarly.
QuillBot
Paraphrase text in unlimited style modes while checking it for grammar errors, plagiarism, and AI-detection risk in one pass. AI Detector and AI Humanizer are now bundled into every premium plan.
DeepL
Translate text and documents that actually read naturally, not like they came out of a machine.
Grok
Get real-time answers pulled from X posts, strong reasoning, and a direct tone that doesn't hedge. The AI built for people who live on the platform.
Claude
The model serious writers and researchers reach for when accuracy matters more than speed. Exceptional at long documents and nuanced reasoning.
Wordtune
Rewrite an awkward sentence into multiple tone-adjusted alternatives instantly, and compress long documents into digestible summaries.
Hemingway App
Score the readability of your writing and flag wordy sentences, passive voice, and complex words, with an optional AI-assisted Plus tier for grammar fixes and rewrites.