Grammarly vs Keigo Mail
Side-by-side comparison of features, pricing, ratings, and alternatives.
Grammarly is an AI writing assistant that checks grammar, spelling, punctuation, and style in real time across browsers, desktop apps, and mobile keyboards. It integrates directly into Gmail, Google Docs, Microsoft Word, Slack, and thousands of other websites via a browser extension. Beyond basic correctness, Grammarly analyzes tone and clarity, suggesting rewrites to make writing more concise, confident, or friendly depending on the context and audience selected by the user. GrammarlyGO adds generative AI features for drafting emails, replying to messages, and rewriting passages on demand, while Grammarly Business adds brand style guides and analytics for teams that need consistent written communication across an organization.
Keigo Mail is a Japanese business email AI service that generates and proofreads polite keigo expressions. It offers multiple tone options, category-based templates, and specific correction feedback.
Free for basic corrections; Premium starts at $12/month, Business at $15/user/month.
- Works across almost every app via browser extension
- Good tone and clarity suggestions beyond basic grammar
- GrammarlyGO speeds up drafting
- Free tier is genuinely useful
- Saves time writing Japanese business emails
- Handles polite keigo automatically
- Provides clear correction reasons
- Customizable tone and templates
- Premium features behind a subscription
- Occasional over-aggressive suggestions
- Privacy concerns for some sensitive writing contexts
- No pricing information available
- No free trial details provided
What reviewers say
Grammarly Reviews
3.0 (2)Good, not great
Grammarly is solid overall, though it's not perfect. On the plus side, good tone and clarity suggestions beyond basic grammar. That said, premium features behind a subscription, which held us back from rating it higher.
Good, not great
Mixed feelings about Grammarly after using it for a while. On the plus side, free tier is genuinely useful. That said, privacy concerns for some sensitive writing contexts, which held us back from rating it higher.
Keigo Mail Reviews
No reviews yet.
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The Verdict
AI-generated from listing dataGrammarly offers a proven, multi‑platform writing assistant with a free tier and broad integrations; Keigo Mail is a niche Japanese‑email AI with no pricing info, suited only for Japanese keigo needs.
Key differences
- •Grammarly works across many apps and platforms; Keigo Mail is limited to Japanese email composition
- •Grammarly provides a free tier and clear pricing; Keigo Mail’s pricing is unknown
- •Grammarly includes grammar, tone, plagiarism, and team style tools; Keigo Mail focuses on keigo generation and proofreading
- •Grammarly offers extensive integrations (Gmail, Docs, Word, Slack); Keigo Mail lists no integrations
- •Grammarly supports collaboration and brand style guides; Keigo Mail has no collaboration features listed
Pricing & value
Grammarly has a free tier and disclosed Premium/Business pricing; Keigo Mail’s pricing is unknown.
Ease of use / learning curve
Grammarly works via browser extensions and apps across platforms; Keigo Mail’s interface details are not provided.
Features & depth
Grammarly offers grammar, tone, plagiarism, generative AI, and style guides; Keigo Mail provides only Japanese email generation, proofreading, templates.
Integrations & ecosystem
Grammarly lists integrations with Gmail, Google Docs, Word, Slack; Keigo Mail lists no integrations.
Collaboration
Grammarly includes brand style guides for teams; Keigo Mail has no collaboration features mentioned.
Security & privacy
Neither product’s security or privacy details are provided in the facts.
Choose Grammarly if…
Anyone needing a general writing assistant with grammar, tone, plagiarism checks, and cross‑app support.
Choose Keigo Mail if…
Japanese business users or non‑native speakers needing automatic keigo email drafting.
Common questions
What is the cost to start using each tool?
Grammarly offers a free tier; Premium starts at $12/month, Business at $15/user/month. Keigo Mail’s pricing is not specified.
Can the tools integrate with my existing email and document apps?
Grammarly integrates with Gmail, Google Docs, Microsoft Word, Slack, etc. Keigo Mail lists no integrations.
Is either tool specialized for Japanese business email etiquette?
Keigo Mail is designed specifically for Japanese keigo email generation and proofreading; Grammarly is not specialized for Japanese business etiquette.