#1 in Grammar & EditingUpdated 2026-08

Grammarly

by Grammarly · AI writing assistant for grammar, tone and rewriting across apps

48.1 — BenchRank score out of 100

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Overview

Grammarly is an AI writing assistant that checks spelling, grammar and tone, rewrites sentences and paragraphs, and generates text from prompts. It runs inside other apps and websites via desktop apps, browser extensions, MS Office and Google Docs add-ins, and mobile keyboards. Paid plans add plagiarism and AI-text detection, a shared style guide, brand tones, snippets and analytics.

Best for: Individuals and teams who want grammar, tone and rewriting help inside the apps they already use
Pricing: Free tier, then Pro at £10 per member per month billed annually (£25 billed monthly); Enterprise is contact sales
Runs on: WebAndroid

Strengths and trade-offs

Strengths

Free tier covers proofreading, tone detection and 100 AI prompts
Apps for Windows, Mac, browsers, MS Office, Google Docs and mobile
Style guide and brand tones to keep team writing consistent
States user content is not sold or used to train third-party models

Trade-offs

Pro costs £25/month monthly; the £10 rate requires annual billing
AI prompts are capped: 100/month on Free, 2,000/member/month on Pro
SSO, DLP, audit logs and BYOK encryption are Enterprise-only
Enterprise pricing is not published — contact sales required

Pricing

Published plans from Grammarly’s own pricing page, in GBP. Usage charges and add-ons may apply on top.

Grammarly pricing tiers, monthly and annual rates in GBP
Plan	Monthly	Annual (per month)	Includes
Free	—per member	—	Write without mistakes See your writing tone Generate text with 100 AI prompts
Pro	£25per member	£10	Rewrite full sentences and adjust tone Detect plagiarism and AI generated text 2,000 AI prompts per member per month 7-day free trial, no payment upfront
Enterprise	Contact sales	—	Unlimited AI prompts and members BYOK encryption and data loss prevention Custom roles, permissions and cost centre visibility Dedicated support

How this score is made up

Each dimension is scored out of 100 and combined into the headline score using fixed weights.

MCP support: 0 out of 100
API quality: 10 out of 100
Documentation: 55 out of 100
Agent friendliness: 68 out of 100
Pricing transparency: 85 out of 100
Customer sentiment: 79 out of 100
Changelog: 40 out of 100
Marketing site structure: 75 out of 100
Operational trust: 85 out of 100

Measured, but not part of the score

Useful to know, but not a mark for or against the product — so these do not affect the ranking.

Openness: 40 out of 100
Maintenance: 15 out of 100

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