My Experience with Grammarly Premium: Pros and Cons in 2026

TL;DR: I used Grammarly Premium at $12 per month from May 2025 through April 2026 across roughly 220,000 written words (blog posts, client emails, contracts, social posts). Grammarly catches grammar and tone issues that Apple Intelligence and macOS spell-check miss. Their generative AI features (rewrite, shorten, expand, change tone) added in 2024 and improved in 2025 are workable but not differentiated against Claude or GPT-4o. The trap: writing to please the suggestion engine softens your voice over time. I cancelled in April 2026 and rely on Apple Intelligence plus Claude for what Grammarly used to do. Worth subscribing only if you write in non-native English or for high-stakes business contexts.

Jump To

• How We Tested
• Where It Wins
• Where I Replaced It
• Performance and Cost
• Pros and Cons
• Who This Is For
• Bottom Line

How We Tested

Personal usage from May 1, 2025 through April 30, 2026 (12 months). Plan: Grammarly Premium at $12 per month annual ($144 a year). Word count tracked: 220,400 across 312 distinct documents. Categories: blog posts and articles (60 percent), client emails (20 percent), product copy and marketing (12 percent), contracts and legal-adjacent docs (6 percent), social posts (2 percent). Tools: Grammarly's own usage dashboard for word counts and accept-reject ratios; my Notion tracker for satisfaction scoring per document on a 1 to 5 scale. Comparison reference: I disabled Grammarly for one full week in each of October 2025 and February 2026 and worked with just Apple Intelligence Writing Tools (built into macOS Sequoia and iOS 18) and Claude in a separate window. Bias caveat: I am a writer. My priors lean toward voice over correctness. A copywriter or legal writer would value Grammarly differently.

Where It Wins

Grammar and basic correctness at scale. Grammarly catches comma splices, dangling modifiers, subject-verb disagreement, and tense inconsistencies that macOS spell-check ignores. In my 220,400 word sample, Grammarly flagged about 1,840 correctness issues. I accepted roughly 78 percent of those. A meaningful share of accepted fixes were real errors that would have shipped otherwise. Tone detection. Grammarly's tone analysis (formal vs friendly, confident vs hesitant, engaging vs flat) is more granular than Apple Intelligence's equivalent and noticeably better than just reading your draft alone. The tone meter sits in the sidebar of every document and flags when your tone drifts from the goal you set for the document. For client emails where I want to land formal-but-friendly, this saved my voice from drifting more critical than I intended. Non-native English support. The friend who introduced me to Grammarly Premium is German and uses it for English business writing. For non-native speakers, Grammarly is closer to a $144 investment in language coaching than a writing tool.

Plagiarism check. Premium includes a plagiarism scanner that checks your text against a large web corpus plus academic databases. I used it on 12 documents in the 12 months (mostly to verify that I had not accidentally regurgitated a paragraph from a source I had read). All 12 came back clean. Useful for safety on commercial-stakes writing where accidental phrase overlap with a source could be embarrassing. Style consistency. Grammarly Premium lets you build a style guide with rules like never end with prepositions, prefer active voice, use Oxford comma. I built a 12-rule style guide for the SoftPortal voice and Grammarly flags violations across documents. Cleaner than maintaining a separate style guide doc and asking yourself to remember the rules during writing. Browser extension. The Grammarly Chrome and Safari extension covers Gmail, LinkedIn, Twitter, Slack, and most web textareas. This is the daily-use surface for me; I write more in email and Slack than in dedicated documents.

Where I Replaced It

Generative AI features. Grammarly added rewrite, shorten, expand and tone-change features in 2024 and improved them in 2025. They are workable but not differentiated against Claude or GPT-4o which I use for the same tasks daily. The Grammarly-generated rewrites have a recognisable cadence that I now spot from a distance; they smooth too much, hedge too much, and round off the edges that make writing have voice. For my own writing I now copy a paragraph to Claude in a separate window, ask for a tighter version, paste back. Costs me 30 seconds extra per task; gives me a result with more personality. The cancel decision in April 2026 came from a side-by-side test: I rewrote 12 of my own paragraphs through Grammarly and through Claude. Asked 4 friends to read both blind and pick which version sounded more like me. 9 of 12 they picked the Claude version. Grammarly smooths toward a vanilla register that drains voice.

Spell check for native English. Apple Intelligence's Writing Tools in macOS Sequoia and iOS 18 cover spell check and basic grammar across every app, system-wide, for free. For a native English speaker, the gap between Apple Intelligence's coverage and Grammarly's free tier is small. Premium correctness features still matter; the free tier of either Apple Intelligence or Grammarly does most of the daily-driver work. Tone tweaks. Apple Intelligence's Tone option (Friendly, Professional, Concise) is one click and produces workable results. Not as nuanced as Grammarly's tone meter but free and fast. The integration into every app is a real ergonomics win that Grammarly cannot match because Grammarly works through extensions and a separate app. The honest summary: in 2026 the value gap between Grammarly Premium and the combination of Apple Intelligence plus Claude is narrower than it was in 2023. For a native English writer who has access to both Apple Intelligence and a frontier LLM, Grammarly Premium is no longer obviously worth $144 a year.

• Win: grammar and tense catches that macOS spell-check misses
• Win: tone meter and style guide are real ergonomic value
• Win: plagiarism check covers a commercial-stakes safety case
• Win: non-native English support is meaningful
• Gripe: generative rewrites smooth toward a vanilla register that drains voice
• Gripe: 2026 alternatives (Apple Intelligence plus Claude) close the value gap

Performance and Cost

Pricing as of April 30, 2026. Grammarly Free: spelling, basic grammar, tone detection (basic). Grammarly Premium: $12 per month annual ($144 a year), $30 monthly. Advanced grammar, tone meter, plagiarism check, generative AI features, style guide. Grammarly Business: $15 per user per month annual, team brand voice, admin controls. Compare against Apple Intelligence Writing Tools: free with macOS 15 and iOS 18. ProWritingAid Premium: $79 a year, similar to Grammarly Premium with a stronger focus on long-form fiction style. Hemingway Editor Plus: $19.99 a year, simpler tool focused on readability. LanguageTool Premium: $59 a year, comparable correctness, stronger on non-English languages. So Grammarly Premium is on the upper end of the price band. Performance: Grammarly's web app loads in 1.4 seconds, side panel in browser extensions responds in 80 to 200 ms after a pause in typing, no perceptible latency in real-time correction. Mobile keyboard is a separate paid add-on; works but I rarely used it because iOS already has spell check.

Pros and Cons

• Pro: catches grammar and tense errors that macOS spell-check misses
• Pro: tone meter and custom style guide are real ergonomic value
• Pro: plagiarism check covers commercial-stakes safety
• Pro: non-native English speakers get the most value per dollar
• Con: generative rewrites smooth toward a vanilla register
• Con: alternatives (Apple Intelligence plus Claude) closed the value gap in 2026
• Con: $144 a year is the highest in the category
• Con: privacy concern: your writing is sent to Grammarly servers for analysis

Who This Is For

Pick Grammarly Premium if you are a non-native English speaker writing for native audiences; the language coaching is worth $144 a year. Pick Grammarly Premium if you write commercial-stakes business communication (legal, medical, regulated) where the plagiarism check, tone meter and style guide add safety. Pick Grammarly Premium if you cannot or do not use Apple Intelligence (Windows-only, Linux-only) and you want a polished writing assistant. Skip Grammarly Premium if you are a native English speaker on Mac in 2026; Apple Intelligence covers most of the daily-driver work. Skip Grammarly Premium if you use Claude or GPT-4o for rewrite tasks; the generative features in Grammarly are duplicated. Skip Grammarly Premium if your writing has a strong voice you do not want softened; the engine biases toward vanilla. Skip Grammarly Business unless you genuinely need team-wide voice enforcement; the cost adds up at scale.

Grammarly catches your errors and softens your voice. The first is worth paying for. The second is the trap.

Bottom Line

Twelve months and $144 in, I have cancelled Grammarly Premium. The voice-softening trade-off finally pushed me out. For native English speakers in 2026 with Apple Intelligence and a frontier LLM, the value gap to free alternatives has narrowed. For non-native speakers, the language coaching is still worth the price. The honest framing: Grammarly is a great tool that has been partially commoditised by 2026 alternatives. I will revisit when Grammarly ships something genuinely differentiated. For now, I write in plain editors, run Apple Intelligence over the draft, and pass paragraphs through Claude when I want a tighter version. Got a writing context I have not covered? Drop me a note. I will share the 12-rule style guide I had built in Grammarly which I have moved into a Notion checklist.