WhatSync
WhatsApp for Gemini
Add WhatSync to an eligible Gemini account and ask about saved WhatsApp messages alongside the Google apps you choose to connect.
How do you connect WhatsApp to Gemini?
Eligible users can add WhatSync in Gemini on the web under Settings, Connected Apps, then Custom apps. Google currently requires a personal Google Account, age 18 or over, US location, English and Keep Activity turned on. After connecting on the web, custom apps are available on web and mobile.
- Works in
- Gemini web and mobile; initial setup is on the web
- You need
- Age 18 or over and located in the US. A personal Google Account, English and Keep Activity turned on. WhatsApp on your phone, or a WhatsApp Business API number.
- WhatSync server
- Hosted for you. Nothing to run yourself.
What Gemini can do with your WhatsApp
WhatsApp next to your inbox
Ask one question that covers Gmail and WhatsApp, like what a client said this week.
Plans into your calendar
Find the date agreed in a group, then ask Gemini to add it to Calendar.
Catch up on groups
Get what you missed in a busy group in a few lines.
Add WhatSync to Gemini
You sign in to WhatSync once. No API keys to paste. Check what you need above first.
Open Connected Apps
Go to gemini.google.com, open Settings, then Connected Apps. If you do not see it, open Personal Intelligence first.
Add a custom app
Under Custom apps, select Add a custom app and paste the server URL. Click Next and follow the sign-in steps.
https://whatsync.app/api/mcpSign in to WhatSync
Sign in with Google or your email and allow access. You land back in Gemini.
Link your WhatsApp
Open your WhatSync dashboard and link your personal WhatsApp from Linked devices on your phone, or connect the WhatsApp Business API. If you ask your agent something first, it replies with a sign-in link that works for 15 minutes.
Choose what it can see
On the What's saved page, enable message saving, pick the groups to include and keep any person out. Groups stay off until you tick them. The agent can read permitted messages saved since you enabled saving; linking does not import your entire WhatsApp history.
Things to ask Gemini
Copy one, change the names, and try it.
Use WhatSync. Who is waiting on a WhatsApp reply from me?
What did the school parents group decide about Friday?
Find the date we agreed on in the Goa trip group and add it to my calendar.
Summarise what Karan said on WhatsApp and in email about the contract.
Good to know
You choose which chats are saved, and you can unlink WhatsApp from your phone at any time. How we handle your data.
- Google currently limits custom apps to users aged 18 or over in the US, in English, with Keep Activity on. This setup is not currently available to users in India.
- Work and school Google Accounts cannot use this Gemini Apps setup. Gemini Enterprise is a separate product with different configuration.
- Sends are real WhatsApp messages and run when your AI app allows the tool call. Keep send tools on manual approval and review the recipient and text. Asking the agent to wait is not an enforced approval setting.
- Use the Business API for campaigns to customers who opted in. The Business API does not permit unsolicited messages. Linked personal accounts can be restricted for violating WhatsApp's rules.
- Search covers saved message text, file names and captions. WhatSync does not index document contents, transcribe voice notes or read text inside images. A download link is available only when WhatSync saved the file.
- Group searches and replies require a linked personal WhatsApp. WhatsApp Business API tools work with customer conversations, templates and campaigns.
- An unanswered conversation means its latest saved message in the checked period is incoming. It is a follow-up signal, not proof that a question is unanswered or that you owe a reply.
Personal WhatsApp or the Business API
Gemini can tell which one you have and uses the right tools for it.
Your personal WhatsApp
- Link the WhatsApp you already use, like WhatsApp Web
- Chats, groups, files, polls and reactions
- For normal one-to-one use, not bulk sending
WhatsApp Business API
- Templates and campaigns your agent can send
- Meta reviews templates and charges per message
- Only for customers who opted in
Questions
Something else? Ask us.
Can Gemini read my WhatsApp messages?
Why can't I find Custom apps in Gemini?
Does it work in the Gemini phone app?
Do I need to install anything?
Does it work with the WhatsApp Business API?
Is WhatSync made by Google?
How much does it cost?
Sources
- Gemini Apps Help: connect and manage custom apps
- Gemini Apps Help: built-in WhatsApp actions and history limits
We checked these steps against Gemini's own docs on October 13, 2026. Menus change, so a screen may look a little different. WhatSync is not made or endorsed by Google.
Use it in your other AI apps too
One WhatSync account works in all of them. Each guide says what you need.
Put your WhatsApp to work in Gemini
Your WhatsApp keeps working on your phone as normal. Unlink it whenever you like.