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. On Mac, Premium works in the same places as the free plan - the browser extension and the Grammarly for Mac app, which covers desktop apps such as Apple Mail, Word and Slack - and every fix is still a suggestion you accept.
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.
What Premium does not change is the workflow. If most of your writing is quick emails and messages, the extra Premium suggestions are more things to review, not fewer mistakes left behind.
Who is Grammarly Premium actually worth it for on Mac?
Grammarly Premium delivers genuine value for a specific user type: someone who edits longer pieces carefully 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 - Grammarly Premium provides that feedback and Charm does not.
The question to ask yourself: what kind of writing fills your day? If it is long documents you edit carefully, Grammarly Premium is worth evaluating. If it is quick emails, messages and notes, where you want mistakes fixed without stopping, a $144 yearly subscription for suggestions you have to accept is 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: spelling correction (Spells, under 200ms), grammar correction at punctuation boundaries (Polish), and word prediction with Tab-to-accept (Oracle), all on-device with zero cloud transmission. These run automatically as you type.
On the specific advantages Grammarly Premium has over Charm: style coaching, tone analysis, clarity scoring, plagiarism checking. These are real features, delivered as suggestions you review. If you mainly want mistakes fixed while you write, they add review work rather than removing it.
The privacy dimension is also relevant: Grammarly transmits all your text to its servers for analysis. Every word you type 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 ($19.99 once) | Grammarly Free | Grammarly Premium ($144/yr) |
|---|---|---|---|
| Works in Slack, VS Code, Notion | Yes | Slack yes, VS Code no | Slack yes, VS Code no |
| Works in Mail, Notes, Pages | Yes | Yes (Mac app) | Yes (Mac app) |
| Works in browsers | Yes | Yes | Yes |
| Real-time spelling correction | Yes | Suggestions | Suggestions |
| Grammar correction | Yes | Basic suggestions | Advanced suggestions |
| Style coaching / clarity scoring | No | No | Yes |
| Tone detection | No | No | Yes |
| 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 corrects as you type, from Mail, Notes, Pages, and Obsidian to your browser and web apps like Slack. Grammarly Premium adds a style-coaching layer on top, as suggestions you review. The two tools can be used together without conflict.
The combined cost is $19.99 (Charm, once) plus $144/year (Grammarly Premium). If the style coaching 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 edit longer pieces carefully, Premium adds real value over Free.
Does Grammarly Premium work in Slack or VS Code?
Premium does not change where Grammarly works. On Mac, both plans run through the browser extension and the Grammarly for Mac app, which covers desktop apps such as Apple Mail, Word and Slack. Premium unlocks more features, but every fix is still a suggestion you accept.
Is Grammarly Premium worth $144 a year?
For writers who want detailed editorial feedback - bloggers, content marketers, students polishing long documents - Premium's style coaching adds real value. For people who mostly want typos and grammar fixed while they write quick emails and messages, reviewing every suggestion is extra work, and Charm's $19.99 one-time payment is the better fit.
Can Charm replace Grammarly Premium?
For spelling, grammar, and word prediction across your Mac, 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 your Mac, 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.