Written by Rithere's developer. The small numbers link to the official source for each fact, checked October 2026. Spot something out of date? Tell us.
In short
Grammarly underlines mistakes while you type, across many apps and websites, and adds AI rewriting in a sidebar.1 Rithere doesn't check as you type. You save instructions as prompts, give each one a shortcut, and it rewrites the text you highlight, right where it is.2
Pick Rithere if you…
- want AI to do whole jobs: notes into an email, a paragraph made simpler
- reuse the same instructions and want each on its own key
- want every feature free, with no monthly AI allowance
Pick Grammarly if you…
- want mistakes caught as you type, without asking
- also write on a Mac, a phone or in several browsers
- need plagiarism checks, or to spot AI-written text
One rewrite, step by step
Same job in both: make a rough paragraph clearer.
Side by side
| Feature | Rithere |
Grammarly |
|---|---|---|
| Checks grammar as you type | NoOnly when you ask. | YesIts main feature.1 |
| AI rewrite of highlighted text | YesOne key, in place.2 | YesSidebar, then Accept.1 |
| Saved prompt on its own shortcut | YesOne key per prompt.2 | NoShortcuts open the assistant or sidebar.3 |
| Ask about text without changing it | YesPopup beside your cursor.4 | YesIn its AI Chat panel.5 |
| Mac, phone, browser extensions | NoWindows 10 or later only.6 | YesAll of them.7,8 |
| Plagiarism and AI-writing checks | No | ProNot on Free.8 |
| Company sign-in and admin | No | EnterpriseCompany sign-in (SSO), unlimited style guides.8 |
| Free plan | EverythingDaily fair-use limit. | Limited100 AI prompts a month.8 |
| Works offline | NoNeeds internet. | NoNeeds internet.9 |
Pros and cons
Tick what you need
The count only adds up your own ticks. It isn't a score.
Tick the lines that describe what you need.
Price
Privacy
- Grammarly uses what it collects to train its AI.11 For individual accounts this is on by default, and you can turn it off.10
- Rithere's servers don't store your text. It goes to Google's Gemini AI on a paid plan, which Google doesn't use to improve its products; Google keeps it 55 days only to check for abuse. A History of your runs stays on your PC, and you can clear it.12
Our take
Want someone checking your typing on every device? Grammarly does that better, and Rithere doesn't try to. Keep copying text into an AI chat to fix it up? Rithere puts that on a key, in the app you're already in, for free. They run fine side by side.
For the technically curious
- Grammarly's documented Windows shortcuts are Shift+Ctrl+Alt+G (assistant) and Shift+Ctrl+G (sidebar).3 Custom instructions for its agent are saved as preferences, not as named prompts.13
- The company behind Grammarly renamed itself Superhuman in 2025; the product kept its name.14 It's retiring its Office add-in in favour of the desktop app.15
- Rithere pastes the result back over your selection and keeps bold and other formatting.16 Your clipboard is saved before each run and put back after.16
- Both can show something when you select text: Grammarly's blue bar,1 Rithere's Action Dot. Rithere's dot can be switched off, and its shortcuts keep working.16
FAQ
For AI rewriting, yes. For grammar checks as you type, no: Rithere only acts when you highlight text and press a key or click. It does come with a Proofread prompt that fixes grammar when you ask.2
Grammarly's plans page lists 100 a month on Free and 2,000 a month per member on Pro.8 Rithere has no monthly allowance; it's free with a daily fair-use limit.
Not yet. It runs on Windows 10 or later (64-bit).6
Sources
Official pages, accessed 16 October 2026.
- Grammarly for Windows and Mac user guide
- Rithere Prompts
- Grammarly keyboard shortcuts
- Rithere Ask
- AI Chat in Grammarly for Windows and Mac
- Rithere FAQ
- Grammarly browser extensions
- Grammarly plans
- Get started with Grammarly
- Grammarly: product improvement and training
- Superhuman (Grammarly) privacy policy
- Where your text goes (Rithere)
- Customize the Grammarly agent
- Grammarly: company rebrand to Superhuman
- Grammarly for Microsoft Office is being retired
- Rithere changelog
