Grammarly Review
The Editing Layer That Belongs in Every Stack.
It follows you into every app you write in, catches what you'd have shipped, and now drafts too. The least exciting subscription you'll be glad you kept.
Quick facts
- Starting price
- Free — Pro $12/mo annual
- Free plan?
- Yes
- Best for
- Anyone who writes in more than one app and cares how it reads
- Platforms
- Chrome, Edge, Safari, Windows, macOS, iOS, Android, Word, Google Docs
BestStacked Score
The Verdict
Grammarly is the only tool here that works where you already are instead of asking you to come to it. That's the whole argument, and it's a strong one — a generative model you have to open is a tool, a correction layer that lives in your Gmail, Slack, LinkedIn, and Docs is infrastructure. The 2026 version added generative drafting and tone rewriting, which are fine but not why you'd buy it. You buy it because it stops you shipping the typo in the client email. Where it gets shakier is the AI detector and the enterprise style-guide features, which oversell what they can actually enforce.
Best for
Professionals writing across email, docs, and social all day, and teams that need consistent written quality.
Skip if
You draft everything inside one AI chat already and ship straight from there.
The Background
What Is Grammarly?
Grammarly is a writing assistant that runs as a browser extension, desktop app, keyboard, and native add-in for Word and Google Docs. It started as a grammar and spelling checker, added clarity, tone, and engagement suggestions, and in the last few years bolted on generative features: draft from a prompt, rewrite for tone, shorten, expand, reply to this email. The distribution is the product — over 40 million daily users and near-universal app coverage means it's active in the moment you write rather than in a separate tab. Business and Enterprise tiers add a shared style guide, brand tones, a snippets library, analytics on team writing, and admin controls. There's also an AI-detection feature aimed at educators and managers that we'd treat with real skepticism.
The Product
Grammarly Features: What You Actually Get
Universal correction layer
Real-time grammar, spelling, punctuation, and clarity suggestions inside effectively every app you write in — Gmail, Slack, LinkedIn, Notion, Word, Docs, and any browser text field.
The client email that would have gone out with a wrong name and a run-on sentence gets flagged in the compose window, not after send.
Tone detection and rewriting
Detects how a message will read — confident, apologetic, blunt — and rewrites to a target tone in place.
A frustrated Slack message to a vendor gets softened to firm-but-professional before anyone reads it.
Generative drafting and replies
Prompt-based drafting inside the app you're in, including one-click email replies that use the thread as context.
Twenty inbox replies in the time ten used to take, each edited rather than written from scratch.
Style guide and brand tones (Business)
Shared terminology rules, banned phrases, and brand tone profiles enforced across everyone's writing, with analytics on adoption.
A 60-person company finally stops writing its own product name three different ways in customer-facing email.
Snippets and knowledge share
Reusable text blocks triggered by shortcuts across apps, so approved answers and boilerplate stay identical everywhere.
Support and sales answer the same security question with the same approved paragraph, without hunting for the doc.
Feature recap
- Real-time editing in effectively every app
- Tone detection and one-click rewriting
- Generative drafting and email replies
- Shared style guide and brand tones (Business)
- Snippets library with shortcuts
- Plagiarism and citation checking (Pro)
- Team writing analytics and admin controls
- Native Word and Google Docs add-ins
The Numbers
Grammarly Pricing: Every Plan Explained
Grammarly's free tier is the best in this roundup and the paid tiers are priced to be an easy yes.
| Plan | Monthly | Annual | Included Features | Best For |
|---|---|---|---|---|
| Free | $0 | $0 | Grammar, spelling, punctuation, basic tone, limited AI prompts | Anyone who writes anywhere — genuinely worth installing |
| ProBest value | $30 | $12/mo | Full clarity and rewrite suggestions, higher AI limits, plagiarism, citations, tone profiles | Professionals writing all day across apps |
| Business | $25/user | $15/user/mo | Style guide, brand tones, snippets, analytics, admin roles, SSO on higher counts | Teams that need consistent external writing |
The annual gap is severe — $12/mo annual versus $30 monthly — so month-to-month is a bad deal by design. Pro at $144/year is easy to justify for anyone whose writing is client-facing; one avoided embarrassing email covers it. Business at $15/user/mo is only worth it if you'll actually configure the style guide; bought and left at defaults, it's Pro with extra admin screens. The free tier deserves the strongest recommendation here: install it regardless of what else you pay for.
The Tradeoffs
Grammarly Pros and Cons
What we love
- Works everywhere you write — no context switching
- Best free tier of any tool in this roundup
- Tone rewriting genuinely prevents bad sends
- Style guide keeps team language consistent
- Word and Google Docs add-ins are first-class
- Setup takes two minutes with no learning curve
What could be better
- Suggestions homogenize voice if you accept them all
- AI detection is unreliable and shouldn't be used punitively
- Monthly pricing is punitive versus annual
- Generative drafting is behind ChatGPT and Claude
- Occasional lag in heavy documents and browser conflicts
The Audience
Who Should Use Grammarly?
The client-facing professional
Sales, consulting, support, recruiting — anyone whose written output is the product surface. Errors cost credibility, and this catches them in the compose window.
The distributed team with mixed writing levels
Business tier with a configured style guide raises the floor across non-native speakers and junior staff faster than any training program.
The writer with a strong voice
Accept every suggestion and you'll sand off the edges that make the writing yours. Run it on free, ignore the clarity nags, and keep your semicolons.
The Methodology
How We Tested Grammarly
We ran Grammarly Pro across a working month of real output — roughly 400 emails, 30 documents, and daily Slack — logging which suggestions we accepted, which we rejected, and how many genuine errors it caught that a careful read missed. We also tested the AI detector against known human and known generated text.
The Field
Grammarly vs The Competition
Grammarly's competition isn't the chatbots — it's other editing layers and the built-in checkers that keep improving.
| Tool | Starting Price | Free plan | Best Feature | BS Score |
|---|---|---|---|---|
| Grammarly | Free — Pro $12/mo annual | Yes | Universal correction layer | 9/10 |
| ChatGPT | Free / $20 per mo | Yes | Best generation and rewriting depth | 9.5/10 |
| Claude | Free / $20 per mo | Yes | Best long-form editing judgment | 9.4/10 |
| Gemini | Free / $19.99 per mo | Yes | In-Workspace drafting with file context | 9/10 |
ChatGPT: Better at rewriting when you go to it. Grammarly wins because it's already in the box you're typing in.Read our ChatGPT review →
Claude: For a serious edit pass on a long piece, paste into Claude. For the other 95% of your daily writing, Grammarly is there already.Read our Claude review →
Gemini: Overlaps inside Google Docs and Gmail specifically. Grammarly still covers Slack, LinkedIn, and everywhere else Gemini doesn't reach.Read our Gemini review →
In The Wild
How People Actually Use Grammarly
Enterprise sales rep
Tone detection catches the outbound email that reads pushy and rewrites it firm-but-warm. Small effect per message, compounding across a few hundred a month.
Support team lead
Snippets plus style guide means twelve agents answer the same question with the same approved wording, and analytics show who's drifting.
Non-native English professional
Real-time correction across every app removes the second-guessing tax on writing in a second language. This is where the tool's value is highest and least discussed.
The Ecosystem
Grammarly Integrations
Integration coverage is Grammarly's actual moat and the reason it survived the chatbot wave.
- →Chrome, Edge, Safari, Firefox extensions
- →Microsoft Word and Outlook add-ins
- →Google Docs, Gmail, Slides
- →Slack, Notion, Jira, Salesforce, LinkedIn
- →Windows and macOS desktop apps
- →iOS and Android keyboards
- →SSO, SCIM, and admin console (Business/Enterprise)
The mobile keyboard is the most underused piece: for anyone who answers email on a phone, it catches the errors that thumb-typing guarantees.
Common Questions
Grammarly FAQ
The Final Word
Should You Use Grammarly?
Grammarly scores 9.0/10 and it's the easiest recommendation on this page: install the free tier today regardless of what else you use. Pro at $12/mo annual is worth it for anyone whose writing is client-facing, and Business earns its price only when someone actually configures the style guide. It is not a replacement for a frontier model — the generative side is competent and unremarkable — but as the layer that catches what you'd otherwise ship, nothing else comes close on coverage. The right 2026 stack for most professionals: Grammarly for the last mile, Claude or ChatGPT for the draft, Perplexity for the facts.
Yes, if
you write across multiple apps and your writing is client-facing
No, if
you draft and ship entirely from inside one AI chat window
Grammarly Is Part Of These Stack Packs
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