KittyHome vs Grammarly, Wordtune and QuillBot: AI writing extensions compared

The short answer

Competitors' plans are as listed on their sites or widely reported in October 2026. They change often, so check before you buy.

Accuracy: does the answer fit what you're replying to?

A fluent reply that misses the point is still a wrong answer. Most AI writing tools only see your prompt, or the sentence you selected, so you end up pasting in the email you're answering and explaining the situation. KittyHome reads the situation itself, and only the parts that matter:

• Email: the thread you're replying to, who wrote what, and the subject. Signatures, footers and the quoted history are left out, so it answers the latest message, not the oldest one.
• Chats (WhatsApp Web, Telegram Web, Discord, LinkedIn messages): the last few messages, so a reply follows the conversation, in its language and its tone.
• Comments and replies: the post you're answering, its author and its code blocks, even on sites that don't mark up their posts. Ask for "reply in the same style" and it answers the post's point and matches its tone, length and look.
• Google Docs and long editors: the text around your cursor or your selection, so an insert fits the paragraph it lands in.

It doesn't make facts up. A draft uses what's on the page, what you wrote and what you asked for. When you need facts it doesn't have, Look it up (Pro and Ultimate) searches the web first and shows the sources it used, so you can check them before you send anything.

What KittyHome does

• Write from a prompt in any text box: press Alt+K on any site, say what you want ("say yes, but not before Friday"), and insert the draft. A marker shows exactly where it will go.
• Suggestions while you type in Gmail, Outlook, LinkedIn messages, WhatsApp Web, Telegram Web and Discord. It steps back when Gmail or Outlook is already suggesting, and every hint is marked as KittyHome's so you know where it came from.
• Rewrite what you wrote: select text or use your whole draft, and ask to fix the grammar, shorten it, make it friendlier and so on.
• Translate and explain anything you select, with a language picker, highlighted right on the page.
• Email helpers: a summary of a long email and one-click reply ideas. Pro adds subject lines and an inbox digest.
• Sounds like you, not like AI: answers are cleaned of stock phrases and AI habits. On Pro, Sound like me rewrites a draft toward how a person writes and gives it a score. On Ultimate, Your voice learns your style from your own samples and writes that way everywhere.
• Job applications too: the same extension fills application forms from your profile and drafts the open questions. See how it compares with job autofill tools.

Grammarly

Grammarly checks your spelling, grammar, clarity and tone as you type, in the browser, in its desktop app and in Word and Google Docs. Its AI can write and rewrite from a prompt too.

• Pros: the best grammar and spelling checker of the group; works almost everywhere, including desktop apps; plagiarism and AI-text detection on Pro; team and enterprise plans.
• Cons: the free plan has 100 AI prompts a month, about three a day; Pro is $30 if you pay month to month; it's built to correct and polish what you wrote, so for a reply you still explain the situation yourself.

Wordtune

Wordtune rewrites the sentence you select: several alternatives, shorter or longer, more casual or more formal. It also summarizes articles and checks spelling and grammar.

• Pros: great alternatives when a sentence doesn't sound right; low prices; simple to use.
• Cons: 10 rewrites a day on the free plan; it improves your wording rather than deciding what to say; no typing suggestions in chats.

QuillBot

QuillBot is a set of tools for rewording and studying: a paraphraser with several modes, a grammar checker, a summarizer, a citation generator and, on Premium, a plagiarism checker.

• Pros: strong paraphrasing; useful for essays and research; citation and plagiarism tools that writing assistants usually don't have.
• Cons: paraphrasing is limited to 125 words at a time on the free plan; it's made for documents more than for replying to emails and messages.

Where KittyHome is ahead

1. 1It knows what you're answering. The thread, the chat or the post comes with every request, so a two-word prompt ("politely decline") gives a reply that fits.
2. 2It works in the box you're in. No copying into another tab and back. Alt+K works in text boxes on any site, Google Docs included.
3. 3Suggestions that are usually right: one to three words at a time, written from your draft and the conversation.
4. 4More free use: 25 requests every day, against Grammarly's 100 AI prompts a month and Wordtune's 10 rewrites a day.
5. 5It writes like a person. Stock phrases are cleaned out, and on the paid plans it can learn and match how you write.
6. 6Writing and job applications in one extension, with one profile and one plan.

Where KittyHome is behind

To be fair to the others, here's what KittyHome doesn't do, so you can decide whether it matters to you:

• No grammar underlines as you type. It fixes grammar when you ask, but it doesn't mark mistakes like Grammarly, Wordtune or QuillBot do.
• Chrome on a computer only. No desktop app, no Word add-in, no phone keyboard.
• No plagiarism checker, AI detector or citation generator.
• Typing suggestions only on six sites (Gmail, Outlook, LinkedIn messages, WhatsApp Web, Telegram Web and Discord). Alt+K works everywhere.
• No team admin plans yet.

Which should you pick?

They also work side by side: plenty of people keep a grammar checker on and use KittyHome to write the reply in the first place.

KittyHome plans

Compare the plans or install the extension and try every feature on its guide page first.