1. What Grammarly Does
Grammarly is a writing assistant that follows you across your entire digital life — Gmail, Google Docs, Slack, browsers, and 500,000+ apps and sites. It checks grammar, spelling, and punctuation in real time, detects tone, rewrites full sentences, runs plagiarism checks, and now includes generative AI (2,000 prompts/month on Pro). After its 2024 rebrand, the old Premium and Business plans merged into a single Pro plan; in 2025 the parent company rebranded to Superhuman, with Enterprise delivered through Superhuman Go.
2. Pros
- Works everywhere. Unlike ChatGPT or QuillBot, you don’t copy-paste — it lives inside your existing apps.
- The free tier is genuinely useful: unlimited core checks plus 100 AI prompts/month.
- Pro bundles a lot: sentence rewrites, tone adjustment, plagiarism detection, AI detection, style guides, and team analytics.
- Tone detection catches “this email sounds annoyed” before you hit send — the feature users cite most.
- 7-day Pro trial with a reminder email two days before it ends.
3. Cons
- The pricing gap is brutal. Pro costs $30/month monthly versus $12/month annual — a 150% markup, far above industry norm. The annual plan charges $144 upfront, and subscriptions are non-refundable.
- Generative AI quality trails ChatGPT/Claude for anything beyond short emails and posts.
- AI-first direction annoys longtime users — some report basic grammar checking getting noisier without upgrading.
- Multilingual support (launched 2026 for Spanish, French, German, Italian, Portuguese) doesn’t yet match the English experience.
4. Pricing: Free vs Pro (Verified October 2026)
|
Plan |
Price |
AI Prompts |
Best For |
|---|---|---|---|
|
Free |
$0 |
100/mo |
Grammar, spelling, tone checks |
|
Pro Monthly |
$30/member/mo |
2,000/mo |
Short-term projects (a thesis, one heavy quarter) |
|
Pro Annual |
12/member/mo (144 upfront) |
2,000/mo |
Daily writers — saves $216/yr vs monthly |
|
Pro Quarterly |
60/quarter (~20/mo) |
2,000/mo |
Middle ground |
|
Enterprise |
Custom |
Unlimited |
150+ seats, SSO/SCIM, DLP |
No student discount directly; institutions license Grammarly for Education instead.
5. Who Is Grammarly For?
Daily writers — professionals, students, and non-native English speakers — will get full value from Pro. Occasional writers should stay on Free, which covers the essentials. If you only need heavy editing for one season (thesis, job hunt), pay one $30 month rather than the annual commitment.
6. Verdict
Grammarly Pro remains the best ambient writing assistant: it corrects you where you already write, which is a different job than ChatGPT. At $12/month annual it’s fair value for daily writers — just never, ever pay the $30 monthly rate unless it’s a one-off month.