Grammarly Inc.’s AI writing assistant. Runs across a browser extension, desktop apps on Windows and Mac, mobile keyboards on iOS and Android, and a web editor. Covers grammar, spelling, clarity, tone detection, and generative rewrites through GrammarlyGO.
Reaches 40 million daily users and 50,000 organizations. Grammarly is now positioned as the writing assistant inside the broader Superhuman suite alongside Superhuman Go, Coda, and Superhuman Mail, while standalone Grammarly remains available.
System Verdict
Pick Grammarly if the writing happens inside the browser and you want a quality layer that never asks you to switch tabs. No other tool catches grammar, tone, and rewrite opportunities inline across 500,000+ web surfaces with the same latency.
Skip it if the job is zero-to-one drafting. GrammarlyGO rewrites are competent but not a substitute for Claude or ChatGPT on long-form content. Technical writers and developers also see aggressive false positives on code and jargon.
Who pays which tier: Free for casual users, Pro for individuals and teams up to 149 seats that need advanced writing and team features, Enterprise for larger or more controlled deployments needing SSO, data loss prevention, admin, and security controls.
Key Facts
| Daily active users | 40M+ (up from 30M in 2024) |
| Organizations | 50,000+ |
| Reach | 500,000+ websites and apps via browser extension |
| Parent platform | Superhuman suite · Grammarly remains available standalone |
| Generative layer | GrammarlyGO · rewrite, tone shift, reply drafts |
| Compliance | SOC 2 · GDPR · HIPAA |
| Developer API | No public general-purpose writing API for buyers |
| Recent strategic move | Superhuman suite positioning with Superhuman Go, Grammarly, Coda, and Superhuman Mail |
Every data point above was verified against official Grammarly and Superhuman documentation on 2026-05-13. See Sources.
What it actually is
One writing quality layer served through four surfaces: a browser extension, a desktop app, mobile keyboards, and a web editor. The same account and suggestions follow the user across Gmail, Google Docs, LinkedIn, Slack, Notion, and most text inputs.
GrammarlyGO adds generative rewrites, tone shifts, and reply drafts inside that same surface. Users select text, pick an action, and accept or discard the output without leaving their current app.
The moat is distribution. The browser extension sits inside the user’s existing workflow and processes text with low-latency suggestions that no external chat interface matches on context-switch cost. The Superhuman suite shift signals a future where that same writing layer sits alongside agents, docs, and mail rather than staying a pure grammar checker.
When to pick Grammarly
- Writing happens inside the browser. Gmail, Docs, LinkedIn, Slack, CMS drafts. Grammarly’s inline layer removes the copy-paste loop that kills momentum with chat-based tools.
- Non-native English writing at scale. The tone detector and rephrasing suggestions catch natural-speech errors rule-based checkers miss.
- Team style consistency. Pro and Enterprise-style features support custom terminology, capitalization, snippets, brand tones, and voice rules across seats.
- Volume email and doc output. Daily writers see the cost per fix collapse when the tool prevents hundreds of small errors per week.
- Compliance-sensitive orgs. SOC 2, GDPR, HIPAA coverage plus Enterprise data controls handle regulated industries.
When to pick something else
- Long-form drafting from scratch: Claude or ChatGPT. GrammarlyGO rewrites trail both on coherence past 2,000 words.
- Marketing team workflows with brand voice: Jasper. Jasper’s brand voice enforcement and campaign management ship features Grammarly lacks.
- Paraphrasing existing text: QuillBot for mode-based rewrites, Wordtune for voice-preserving sentence rewrites.
- Fiction and creative prose: Sudowrite. Fiction workflow and the Muse model specialize where Grammarly is generic.
- Developer API for embedded writing checks: No Grammarly option. Third-party grammar APIs or LLM-based tooling fill this gap.
Pricing
Subscription pricing via grammarly.com/plans:
| Plan | Price | Key Features | Who’s it for |
|---|---|---|---|
| Free | $0 | Grammar, spelling, punctuation, basic clarity | Casual users |
| Pro | $30/member/mo monthly, $60/member quarterly, or $144/member/year | Advanced writing features, tone suggestions, full-sentence rewrites, and team features that were previously Business | Most paying individuals and small teams land here |
| Enterprise | Custom | Advanced security and admin controls, SAML SSO, data loss prevention, and larger procurement needs | Larger teams or regulated industries |
Prices verified 2026-05-13 via Grammarly support and grammarly.com/plans. Grammarly support says Pro replaces the old Grammarly Business plan and allows up to 149 seats.
Against the alternatives
| Grammarly Pro | ChatGPT Plus | Wordtune Plus | |
|---|---|---|---|
| Inline browser coverage | 500,000+ sites | None native | Chrome extension only |
| Grammar and spelling | Strongest rule + AI hybrid | Weak without prompting | Mid |
| Tone detection | Yes, document-level | Prompt-driven only | Mode selection only |
| Generative drafting | GrammarlyGO (inline) | Strongest (full chat) | Rewrite only |
| Plagiarism scan | Yes, 16B+ sources | None | None |
| Team style guides | Pro/Enterprise | None | Teams tier |
| Best viewed as | Inline writing layer | Generalist assistant | Voice-preserving rewriter |
Failure modes
- GrammarlyGO rewrites hit a coherence ceiling. Works well inside a paragraph. Drift and generic phrasing show up past 1,000 words, where Claude and ChatGPT produce tighter output.
- False positives in technical contexts. Flags valid code, domain jargon, and proper nouns as errors. Dev tools, API docs, and scientific writing need frequent dismissals.
- No developer API. Teams that want Grammarly-quality checks embedded in internal apps or proprietary editors have no supported path.
- Cloud processing only. All text routes through Grammarly servers for analysis. Regulated orgs that need on-premise processing default to Enterprise data controls or avoid the product.
- Tone detection drifts on short text. Single sentences and bullet points surface misleading tone signals. The feature assumes a paragraph of context.
- Old Business plan assumptions are stale. Grammarly support now says Pro replaces Business, so teams should re-check seat, admin, and procurement requirements before renewing.
- Strategic uncertainty during the Superhuman suite pivot. The roadmap is expanding beyond pure grammar. Core users should track whether writing-assistant investment stays level as Superhuman Go, Coda, and Mail features ship.
Methodology
This page was produced by the aipedia.wiki editorial pipeline, an automated system that ingests vendor documentation, verifies pricing and model details against primary sources, and generates the editorial analysis you are reading. No individual human wrote this review. Scoring follows the four-dimension rubric at /about/scoring/ (Utility x Value x Moat x Longevity, unweighted average). Last verified 2026-05-13 against Grammarly Plans, Grammarly support pricing docs, Grammarly AI, and the Superhuman suite support page.
FAQ
Is Grammarly free? Yes. The free tier covers core writing help. Pro unlocks advanced writing and team features. Grammarly support lists Pro at $30/member/month, $60/member/quarter, or $144/member/year (Grammarly support).
Is Grammarly Pro worth it vs the free tier? Yes for daily English writers. Pro’s tone suggestions, full-sentence rewrites, advanced writing features, and team controls cover professional polish the free tier does not. Infrequent users may get enough from free.
What changed with Superhuman? Grammarly is now part of the Superhuman suite alongside Superhuman Go, Coda, and Superhuman Mail. Grammarly support says standalone Grammarly remains available for customers who prefer it.
Grammarly vs ChatGPT or Claude for writing? Grammarly checks and polishes text inline across the browser. ChatGPT and Claude draft and rewrite at higher quality but require copy-paste out of the source app. Most professional writers run both: Grammarly inline, a chat LLM for drafting and long-form rewrites.
Does Grammarly have a developer API? No public general-purpose writing API for buyers. Grammarly is primarily delivered through apps, extensions, and enterprise software.
Sources
- Grammarly Plans: Current Free, Pro, and Enterprise-facing plan surface
- Grammarly Pro pricing support: Pro monthly, quarterly, annual pricing and Business replacement note
- Grammarly AI: AI writing, tone, and in-workflow positioning
- Superhuman suite support: Suite packaging and standalone-product notes
Related
- Category: AI Writing
- Comparisons: ChatGPT vs Grammarly · Claude vs Grammarly · Grammarly vs QuillBot · Grammarly vs Wordtune · Grammarly vs Sudowrite
