Gemini in Gmail vs AI Reply Writer: built-in AI or one reply tool everywhere?
Google's Gemini in Gmail ("Help me write", suggested replies) compared with AI Reply Writer: availability, where each works beyond Gmail, and when to use which.
Gemini in Gmail is Google's own AI built into Gmail: it can draft emails with "Help me write", suggest replies and summarise threads, with availability depending on your Google account, plan, region and language. AI Reply Writer works in Gmail too, and in 23 sites in total — Outlook, LinkedIn, WhatsApp Web, Instagram, Slack, review sites and more — with the same button and the same voice. Use Gemini if you live in Google's apps and have it on your plan; use AI Reply Writer if your replies are spread across many apps.
At a glance
| Gemini in Gmail | AI Reply Writer | |
|---|---|---|
| What it is | Google's AI features built into Gmail and Google Workspace | An AI reply writer: a ✦ AI Reply button inside the reply box |
| Where it works | Gmail and other Google apps | 23 sites, including Gmail, Outlook, LinkedIn, WhatsApp Web, Instagram, Facebook, Slack and Teams |
| Reads the conversation | Yes, within Gmail | Yes — the thread you have open, plus photos and PDFs in Gmail, Outlook and WhatsApp Web |
| Review replies | Not part of Gmail | Yes — Google Business Profile and Trustpilot, reading the star rating |
| Free plan | Some features on some personal accounts; varies by region and language | 20 replies a month |
| Paid plans | Fuller access with Google's AI plans and eligible Workspace plans | Starter $7, Elite $14, Ultra $29 a month |
| Browsers and phone | Gmail on the web and in Gmail's mobile app | Chrome, Edge, Brave, Opera, Vivaldi and Firefox; a web app on phones |
| Sends anything for you? | No — you review and send | Never — it fills the box, you press Send |
What Gemini in Gmail is
Google has built its Gemini AI into Gmail. Depending on your account, you may see "Help me write" for drafting an email from a prompt, suggested replies under a message, and summaries of long threads. Because it is part of Gmail, it also works in Gmail's mobile app, and it needs nothing installed.
Which features you get depends on your Google account type, your plan (personal, Google's paid AI plans or Workspace), your region and your language, and Google rolls features out in stages. Check the Gemini settings in your own Gmail to see what is available to you.
What AI Reply Writer is
AI Reply Writer adds a ✦ AI Reply button to Gmail's reply box — and to the reply boxes of 23 sites in total. In Gmail it reads the whole thread and its attachments (photos and PDFs), and needs no access to your Google account: it reads only the email open on your screen, when you press the button.
- The same tool everywhere: Gmail, Outlook, LinkedIn, WhatsApp Web, Instagram, Facebook, Slack, Teams and more.
- Review replies on Google Business Profile — which is not part of Gmail — and Trustpilot.
- A choice of AI models, with advanced models on paid plans.
The main differences
One app vs many
Gemini in Gmail is excellent where it is available, but it lives in Google's apps. If you also answer customers on WhatsApp, clients in Outlook, and comments on LinkedIn and Instagram, a single reply tool across all of them is simpler than a different AI in each.
Availability
Gemini's features vary by plan, region and language. AI Reply Writer works the same way for every account on the sites it supports, in any language your Gmail is set to.
Phone
Gemini works inside Gmail's mobile app. AI Reply Writer is a desktop browser extension; on a phone, its web app writes replies you copy.
Pricing
Gemini's Gmail features come with Google accounts and plans as Google decides; see Google's own pages for what your plan includes.
AI Reply Writer has a free plan with 20 replies a month, no card needed. Paid plans are Starter ($7 a month), Elite ($14) and Ultra ($29); higher plans unlock more advanced AI models and larger allowances, and teams can buy the same plans per member. See pricing.
Which should you choose?
- Use Gemini in Gmail if you work mainly in Gmail and Google Workspace and it is available on your plan — especially if you want AI on your phone.
- Use AI Reply Writer if your replies are spread across email, social media, chat apps and review sites, or Gemini is not available for your account or language.
- Use both: they work side by side in Gmail.
About this comparison: it is based on each product's public information as of October 2026, and both products change often — check the other product's own website for its current features and prices before you decide. Product names are trademarks of their owners; AI Reply Writer is not affiliated with them.
Frequently asked questions
Is Gemini in Gmail free?
Some Gemini features in Gmail are available on some personal accounts, while fuller access comes with Google's paid AI plans and eligible Workspace plans. Availability also depends on region and language — check your own Gmail settings.
What is the difference between Gemini in Gmail and AI Reply Writer?
Gemini is Google's AI built into Gmail and Google apps. AI Reply Writer is a browser extension that adds a reply button to Gmail and many other sites, including Outlook, LinkedIn, WhatsApp Web and review sites.
Does AI Reply Writer need access to my Gmail account?
No. There is no Google sign-in and no Gmail API access. It reads only the email open on your screen, when you press the button.
Can I use Gemini and AI Reply Writer together?
Yes. They do not interfere with each other in Gmail.
