Hark vs Grammarly: which one should you use?
Grammarly makes what you write better. Hark reads what you received and writes the first draft. They overlap in the reply box and almost nowhere else — and they work well together.
Choose Grammarly if your problem is the quality of your own writing: grammar, clarity and tone in every text field. Choose Hark if your problem is the volume of email: understanding threads fast, getting a draft reply and not missing what they ask of you.
At a glance
Hark and Grammarly, side by side.
| Hark | Grammarly | |
|---|---|---|
| What it is | Chrome extension — an AI agent in the side panel | AI writing assistant for grammar, clarity and tone |
| Where it runs | Google Chrome on Windows, macOS, Linux and ChromeOS | Browser extensions, desktop and mobile apps |
| Acts on websites | Yes — clicks, types and fills forms in your current tab | No — suggestions and rewrites in text fields |
| Approval before final steps | Always, before send, submit, book, pay or delete | Not applicable |
| Email help | Summaries, reply drafts and deadlines in Gmail & Outlook on the web | Polishes and rewrites what you write |
| Tracker for orders & deadlines | Built-in Tracker for orders, bookings, bills and deadlines | No |
| Account needed | No account — install and use | Account required |
| Free plan | 1 AI request per day, all modes | Basic grammar and clarity checks |
| Paid plans | $5.99/week (2-day trial), $14.99/month or $39.99/year | Pro about $12/month billed annually |
| AI models | OpenAI models, in Fast and Smart modes | Grammarly’s own AI |
Choose Hark if…
- You want the incoming thread summarized first
- You want a full draft reply, in the email’s language
- You want tasks and dates extracted and tracked
- You also want an agent for tasks on websites
Choose Grammarly if…
- You write a lot and want every sentence checked
- You need tone and style consistency across apps
- You want writing help outside the browser too
Different ends of the same email
Email has two halves: reading and writing. Grammarly lives in the writing half and is the best-known tool there. Hark starts in the reading half — it tells you what the thread says and what it needs — and then hands you a draft. Many people will happily let Hark draft and Grammarly polish.
Beyond email
Outside the inbox the products diverge completely. Grammarly follows your cursor into every text field. Hark follows your tasks onto every website, as a browser agent that fills forms and books things with your approval.
FAQ
Hark vs Grammarly: common questions
Can I use Hark and Grammarly together?
Yes. Hark inserts a draft into the reply box and Grammarly can then check it like any other text.
Does Hark check grammar as I type?
No. Hark does not watch what you type. You can ask it to rewrite or improve a text you paste or select.
Does Grammarly summarize email threads?
Grammarly’s focus is writing assistance. Check Grammarly’s site for its current AI features.
More comparisons
Hand your next task to Hark.
Add it to Chrome, open the side panel and say what you need. It takes about ten seconds.
Free plan included · No account needed · Works in Chrome on Windows, Mac, Linux and ChromeOS