Our take

The everywhere writing assistant — sits in every textbox you use, catching what your eye misses.

What it is

Grammarly is an AI writing assistant that works across browsers, desktop apps, and mobile. It started with grammar and spelling, and has expanded into tone adjustment, clarity rewrites, generative writing, and 2026 productivity agents that help with writing-heavy workflows. It is the most ubiquitous writing tool on the web.

Best for

Catch grammar and clarity issues anywhere you type
Adjust tone for different audiences
AI-assisted drafting and rewriting

Pros

Works in virtually every app and browser
Mature, reliable grammar engine
Useful free tier

Cons

Best features need Premium
Suggestions can feel prescriptive for strong writers

Quick start

Install the Grammarly extension (Chrome, Edge, Safari, Firefox) or the desktop app — sign in with Google or email.
Free tier: grammar, spelling, tone; basic generative rewrites.
Premium $12/mo (annual) / $14.99 month-to-month: full-sentence rewrites, tone adjustments, plagiarism detection, advanced AI generation.
Business $15/user/mo (annual): brand tone, style guide, admin analytics, team usage reporting.
GrammarlyGO: type in any textbox → click the Grammarly icon → prompt "make this clearer" or "summarize this email thread" → output appears inline.
2026 productivity agents: link Gmail / Outlook / Slack → set rules ("rewrite all customer emails into friendly tone") → agent fires automatically.

Sample input / output

Input

Email draft (in Gmail):

  "Per my previouse email, I am writing to follow up on the status of our Q3 engagment. As discussed, please find the relevent documentation attatched. I would appreciate if you could revert back at your earliest convinience."

Grammarly suggestions:
  - spelling: "previouse" → "previous"; "engagment" → "engagement"; "relevent" → "relevant"
  - attatched → attached
  - tone: Formal — a bit stiff
Prompt: "Make this clearer and friendlier, keep it under 80 words"

Output

"Following up on my previous email — could you share where we are with the Q3 engagement? I've attached the relevant docs (and fixed a couple of typos, thanks auto-correct). Happy to jump on a quick call if it's easier. — Sam"

Grammarly checks completed in ~2 seconds:
  - Spelling: 5 fixed (already had them queued from realtime)
  - Tone shift: Formal → Friendly (suggestion applied)
  - Sentence clarity: removed "Per my previous email" opener (per Grammarly's corporate-tone guidance)
  - Plagiarism scan: clean (Premium feature)
Time saved: ~6 minutes per status email × 12 emails/week ≈ 70 min/week.

Benchmarks

Plans Free; Premium $12/mo; Business $15/user/mo (annual) — Grammarly pricing 2026

Platforms Browser extension (4), desktop app (Mac/Win), iOS/Android keyboards, MS Office add-in — Grammarly products

Active users 40M+ DAU on Grammarly Editor; 30M+ on browser extension — Grammarly company

Languages supported English (premium); Spanish, French, German, Portuguese, Italian (basic AI) — Grammarly docs

Tone detection 8 tones (formal, friendly, confident, etc.) — Grammarly product

Brand tone Business plan: upload a brand voice guide — Grammarly Business

Pricing

Free; Premium ~$12/mo

Underlying models

Proprietary (multi-provider)

Should you pick this?

Pick it if You write a lot in tools where Grammarly's extension naturally lives (Gmail, Docs, Slack, Notion) and you want both grammar and tone/coherence in one place.

Skip it if You only need generative writing or ChatGPT-style Q&A — that's not Grammarly's core. For technical / programming writing, use GitHub Copilot Chat in your IDE.

Grammarly