Grammarly

grammarly.com ↗

AI writing assistance for grammar, clarity, tone, and text generation.

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SI Score: 80/100
Pricing: Not confirmed
Free plan: Not confirmed
Sign-up required: Not confirmed

Ask SI about Grammarly

Answers use saved listing facts and recorded sources.

Homepage screenshot

SI REVIEWBased on the site's own pages, in a directory managed by people

What it does

Grammarly is an AI writing assistant that checks grammar, punctuation, spelling, clarity, and tone. It offers full sentence and paragraph rewrites, text generation, and AI agents for tasks such as proofreading and paraphrasing. It works in major browsers, desktop apps, mobile apps, and across many apps and websites. A free account is available, along with paid Pro and Enterprise plans.

The official site includes a free account signup page. The features page lists tools such as grammar checker, plagiarism checker, AI detector, AI humanizer, citation generator, essay checker, paraphrasing tool, translator, tone detector, word counter, and style guide. It states that Grammarly works across 1 million+ apps and websites and is available in major browsers, Windows and Mac desktop apps, and Android, iOS, and iPad apps. Pricing shown includes Free at $0 USD per month, Pro at $12 USD per member per month billed annually or $30 when billed monthly, and Enterprise through Contact Sales. The site also links to Docs, Help Center, Contact Sales, and plans.

Best for

Proofreading and grammar checksSentence and paragraph rewritingTone and clarity suggestionsWriting in many apps and websites

SI Score

80/100

#1 in Writing & Content

Based on published information. No hands-on task test.

Method 2.0 · Published source review Assessed Oct 28, 2026Score ceiling for this evidence: 84/100.

Product usefulness 80

Evidence

Grammarly's dated full homepage shows existing text revised through one-click paragraph rewrites, tone suggestions and proofreading inside a writing context. The plan descriptions distinguish Free's one hundred generation prompts from Pro's sentence rewriting, tone adjustment and two thousand prompts. These revision controls and explicit allowance scope support 80; AI-detection labels, security statements and claimed organization savings are not measured product outcomes here.

Limits: Source-researched AI assessment reviewed by a separate native AI worker. No hands-on product test or human verification is claimed.

Source links and check dates are in Sources and checks below.

Separate website checks

These checks do not add points to the SI Score. They inspect the website's HTML, not the product in use.

Basic website checks100/100

HTTPS: yes
Homepage answered with HTTP 200
Privacy policy link: found
Terms link: found
Contact or about page: found

We check that these pages exist, not what they say. Ownership and company details are not verified.

Checked Oct 18, 2026.

HTML accessibility checks90/100

Page language set: en-US
Mobile viewport: yes
Images with a text alternative: 40 of 57
Main heading (h1): yes

Automated checks on the homepage HTML only. This is not a full accessibility audit.

Checked Oct 18, 2026.

Homepage HTML response100/100

First byte after 228 ms
Homepage HTML loaded in 0.3 s
HTML size 530 KB

Measured once from our server. Images, scripts and your own connection are not included.

Checked Oct 18, 2026.

Trackers in homepage HTML88/100

Third-party trackers in the homepage code: Google Tag Manager

Only the homepage HTML is checked. Trackers loaded later by scripts, and what the service does with your data, are not covered.

Checked Oct 18, 2026.

Page date hintsunknown

No copyright year found on the page.

Unknown. The page gives no date we can rely on.

Checked Oct 18, 2026.

Policy links do not verify a company's conduct. An HTML response time is not application speed. Tracker and accessibility checks miss behavior after page load. Copyright dates do not prove product upkeep.

How the SI Score works →

Unconfirmed details may be unassessed, absent from the pages checked or temporarily unreadable. A missing price does not mean the service is free.

Sources and checks

Supporting pages for product usefulness, site facts, prices and separate website checks. Each record keeps its own date. Reading a page does not establish how well the product performs in use.

www.grammarly.com/
- Product usefulness evidence
- Basic website checks (separate check)Checked Oct 18, 2026
- HTML accessibility checks (separate check)Checked Oct 18, 2026
- Homepage HTML response (separate check)Checked Oct 18, 2026
- Trackers in homepage HTML (separate check)Checked Oct 18, 2026
- Page date hints (separate check)Checked Oct 18, 2026
www.grammarly.com/privacy-policy
- Basic website checks (separate check)Checked Oct 18, 2026
www.grammarly.com/terms
- Basic website checks (separate check)Checked Oct 18, 2026

Checks without a source link

PricingUnknownChecked Oct 18, 2026
Free planUnknownChecked Oct 18, 2026
Sign-up requiredUnknownChecked Oct 18, 2026
PlatformsUnknownChecked Oct 18, 2026
APIUnknownChecked Oct 18, 2026
Open sourceUnknownChecked Oct 18, 2026

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