Is Grammarly Premium Worth It on Mac? Compared to Charm
Grammarly Premium adds style coaching, tone analysis, and clarity scoring on top of the free spelling and grammar features. At $144 per year, it is a meaningful investment - but it remains a browser extension on Mac. Every additional Premium feature still only works in Chrome, Safari, and Firefox. If you write primarily in native Mac apps like Mail, Slack, Notes, VS Code, or Pages, Grammarly Premium adds zero additional coverage where you actually work.
What does Grammarly Premium add over Free?
Grammarly's free tier catches spelling errors and basic grammar mistakes - missing articles, obvious subject-verb disagreements, wrong punctuation at sentence boundaries. For casual writing, the free tier provides a meaningful baseline.
Premium adds a substantially richer layer of analysis, all still within the browser extension context:
Clarity and conciseness suggestions: Premium flags unnecessarily complex phrasing, wordy constructions, and passive voice where active voice would be clearer. These suggestions go beyond correctness into editorial quality.
Engagement and delivery scoring: Premium rates your writing on engagement and delivery scales, suggesting ways to make it more compelling or appropriately professional.
Tone detection: Premium identifies the emotional tone of your writing (confident, formal, friendly, cautious) and flags when tone seems mismatched with the likely context.
Full sentence rewrites: Where Free might flag an awkward sentence, Premium suggests a complete rewrite. This goes beyond correction into active editorial guidance.
Plagiarism checker: 25 checks per month via Turnitin's database, relevant primarily for students and academic writers.
Style guide customization: Teams can set organizational style rules that flag deviations consistently across all members. Relevant for enterprises with brand voice requirements.
Knowledge workers spend over 60% of their typing time in native desktop apps outside browsers. For these users, every one of Grammarly Premium's features is invisible - they never encounter a Premium suggestion in Slack, Mail, VS Code, or Notes.
Who is Grammarly Premium actually worth it for on Mac?
Grammarly Premium delivers genuine value for a specific user type: someone who writes primarily in browser-based tools and wants detailed editorial guidance beyond correctness.
This profile fits: bloggers publishing through WordPress web or similar CMS platforms, content marketers writing in Google Docs, students submitting papers through browser-based portals, and teams using Notion Web or similar browser-based collaboration tools.
For this user, Grammarly Premium offers something Charm does not: the style coaching layer. Charm corrects errors but does not evaluate clarity, engagement, or tone. If you want to know that your sentence is wordy, your tone is overly cautious, or your paragraph lacks engagement - and you are writing in a browser - Grammarly Premium provides that feedback and Charm does not.
The question to ask yourself: where do you do most of your writing on a typical work day? If the honest answer is primarily in browser tabs, Grammarly Premium is worth evaluating. If the honest answer is across Mail, Slack, VS Code, Notes, and other desktop apps, the browser-only limitation makes Premium a poor investment.
How Charm compares to Grammarly Premium in total value
For the core use case that most Mac users need - reliable spelling and grammar correction wherever they type - Charm is more effective than Grammarly Premium despite costing less than a single month of the Premium subscription.
Charm provides: real-time spelling correction (Spells, under 200ms), real-time grammar correction at punctuation boundaries (Polish), word prediction with Tab-to-accept (Oracle), on-device processing with zero cloud transmission of your text, and coverage in every Mac app including Electron apps like Slack, VS Code, Obsidian, Discord, and Notion.
On the specific advantages Grammarly Premium has over Charm: style coaching, tone analysis, clarity scoring, plagiarism checking. These are real features - but they only work in browsers. If you want style coaching in your daily desktop workflow, Grammarly Premium cannot deliver it where most of that workflow happens.
The privacy dimension is also relevant: Grammarly transmits all your text to its servers for analysis. Every word you type in a browser while Grammarly is active leaves your Mac. Charm processes everything on-device. For users handling confidential client communications, legal documents, or sensitive business information, this is a meaningful difference.
| Feature | Charm ($9.99 once) | Grammarly Free | Grammarly Premium ($144/yr) |
|---|---|---|---|
| Works in Slack, VS Code, Notion | Yes | No | No |
| Works in Mail, Notes, Pages | Yes | No | No |
| Works in browsers | Yes | Yes | Yes |
| Real-time spelling correction | Yes | Yes (browsers) | Yes (browsers) |
| Grammar correction | Yes | Basic (browsers) | Advanced (browsers) |
| Style coaching / clarity scoring | No | No | Yes (browsers) |
| Tone detection | No | No | Yes (browsers) |
| Word prediction | Yes - Oracle | No | No |
| On-device processing | Yes | No | No |
Can you use Grammarly Premium and Charm together?
Yes, and this is a reasonable combination for users who write both in browsers and across native Mac apps.
Charm handles the desktop layer: all of Mail, Slack, VS Code, Notes, Pages, Obsidian, and every other non-browser app. Grammarly Premium adds the style coaching layer inside browsers - Google Docs, Notion Web, WordPress editor, email web clients. The two tools cover different surfaces and do not conflict.
The combined cost is $9.99 (Charm, once) plus $144/year (Grammarly Premium). If the browser-based style coaching genuinely improves your output quality, the combination may be the best possible setup on Mac. For most users, Charm alone covers enough ground that the additional Grammarly Premium cost is hard to justify.
Frequently asked questions
Is Grammarly Premium better than the free version?
Yes, meaningfully so within its coverage area. Grammarly Premium adds clarity and conciseness suggestions, engagement scoring, tone detection, style guide customization, and 25 monthly plagiarism checks on top of the free spelling and grammar features. If you write primarily in browser-based tools, Premium adds genuine value over Free.
Does Grammarly Premium work in Slack or VS Code?
No. Even at the Premium tier, Grammarly on Mac is a browser extension only. The Slack desktop app, VS Code, Discord, Notion, Obsidian, and all other desktop applications receive no Grammarly coverage regardless of subscription level. Premium unlocks more features, but does not expand the coverage beyond browsers.
Is Grammarly Premium worth $144 a year?
For users who write primarily in browsers - bloggers using WordPress web, content marketers in Google Docs, students submitting via browser-based portals - Premium's style coaching adds real value. For users writing across multiple desktop apps (Mail, Slack, VS Code, Notes), the browser-only limitation makes it poor value compared to Charm's $9.99 one-time payment.
Can Charm replace Grammarly Premium?
For spelling, grammar, and word prediction across every Mac app, Charm fully replaces Grammarly Premium's correctness features. Charm does not replicate Grammarly Premium's style coaching, passive voice analysis, engagement scoring, or plagiarism checking. For real-time error correction across all apps, Charm is the stronger choice.
What does Grammarly Premium catch that Free misses?
Grammarly Premium adds clarity and conciseness suggestions, engagement and delivery scoring, tone detection and adjustment, full sentence rewrites for awkward phrasing, style guide customization for teams, and 25 plagiarism checks per month. The Free tier covers spelling and basic grammar errors only.
System-wide correction for $9.99. No renewal.
Charm corrects spelling, grammar, and predicts words across every Mac app - Slack, VS Code, Mail, Notes, everywhere. One payment, yours forever.