California can stop the spread

Add your phone today to California's exposure notification system

You have the power to help your friends, family and community

Add your phone to California’s exposure notification system to get COVID-19 exposure alerts and to protect those around you.

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How does it work?

Once you activate CA Notify, it does all the work. All you do is keep your Bluetooth on. You will only receive alerts if you were in close contact with someone who tests positive for COVID-19. Your privacy is protected as your identity is not known and your location is not tracked.

Imagine that two people have Exposure Notifications turned on. If they come within six feet of each other for 15 minutes or more within a day, their phones will exchange keys (randomly generated, anonymous numbers) that log that close interaction.

If one person later tests positive for COVID-19 and agrees to share that information with CA Notify, then the other will receive an alert that they have been exposed. That notification will include instructions on who to contact and what to do next.

Serious about protecting privacy

CA Notify does not gather:
Your name
Your contact information
Your location or movements
The identity of the people you meet
Learn more about how California is protecting your privacy here.

How will I help?

CA Notify is an added layer of protection for you and your community. In addition to wearing a face covering, physically distancing, and washing your hands, adding your phone will help to keep you and others safe.
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Add your phone today


Android users can download CA Notify on the Google Play Store here.

Download CA Notify from the Google Play Store

If you require technical support,
contact the Help Desk
1 (888) 421-9457

Join your community

People across California are coming together to save lives. Join them by adding your phone today.

Frequently asked questions

CA Notify uses Bluetooth Low Energy (BLE) technology to exchange random codes with the phones of others who have opted in without revealing any information about the users. If another CA Notify user you've been near in the last two weeks tests positive for COVID-19 and adds their unique, anonymous verification code to the app, you’ll get an anonymous notification that you have potentially been exposed. You will be referred to COVID-19 resources so you can quickly get the testing and care you need to prevent exposing others in your community.

The system never collects or shares any location data or personal information with Google, Apple, California Health and Human Services (CHHS), or other users. Participation is entirely voluntary. Users can opt in or out at any time. CA Notify is designed to protect user privacy and security – it does not collect device location to detect exposures and does not share your identity to other users. The random keys are exchanged using Bluetooth and are not linked to your identity or location. The keys will change every fifteen minutes to protect you.

The identifiers exchanged with other phones and the keys shared with the system when you are positive are randomly generated numbers that don’t contain any personally identifiable information. The identifiers exchanged with other phones are stored securely on your phone by the operating system in a way that no other software application can access them, nor do they ever leave the phone.

Starting December 10, Android users can download CA Notify through the Google Play store and follow the prompts to activate.

iPhone users can enable notifications directly in their settings:

iPhone users can enable Exposure Notification directly from Settings. Open the Setting App > Exposure Notifications > Turn On > Select United States / California and complete the onboarding

You will be notified once the COVID positive individual authorizes Exposure Notifications to send out an alert. How quickly you receive the notification will depend on when that person received a positive result and how quickly they consented to activate notifications. You can be notified of any exposure that happened within the last 14 days.

Quickly becoming aware of COVID-19 exposure is key to stopping the spread. CA Notify complements other prevention measures including masking, physical distancing reduced mixing, and hand washing. By alerting individuals of possible exposure to the virus, they can make decisions around isolating to reduce the spread and keep themselves and others safe. This information is especially helpful for asymptomatic people who may not have symptoms but can still spread the virus. Reports from the UC system pilot show that using the CA Notify technology reduces infections. Just like wearing masks, physical distancing, handwashing and avoiding gatherings, CA Notify is another tool to help prevent the spread of COVID-19.

Your positive test result will only result in Exposure Notifications if you consent to notify others. Even then, your personal information is not collected, stored or shared by the exposure notification system.

No. If you test positive, you will receive a verification code from the California Department of Public Health that allows you to activate the notification process. The code allows your phone to transmit your random keys to other CA Notify users. When you choose to activate this function, any phones that you were within 6 feet of for 15 minutes or more during your infectious period can receive a notice of a possible exposure. The notification will tell the other users the date of their exposure, but does not include information about location, time, or identity.

Nearly 20 states and territories have launched apps based on Google and Apple’s Exposure Notification technology. In California, CA Notify has been piloted at seven different University of California campuses. Just like wearing masks, physical distancing, handwashing and avoiding gatherings, CA Notify is another tool to help prevent the spread of COVID-19.

No, the service does not use or store personally identifiable information and is designed to protect your privacy. The technology does not record your location or use your GPS. It uses the Bluetooth feature of your phone to exchange randomly generated random “keys” (example: ABC123DGG67) that are not associated with your phone number, your name, your location, or your IP address. These random keys change approximately every 15 minutes to protect your identity. The system uses a secure, decentralized design to determine if you have been in contact with a positive individual. Keys are only stored on a user’s devices, until such time a user who tests positive decides to share those keys with other users. After 14 days, or once an alert is triggered, the keys are permanently erased from the user’s device.

CA Notify will be available in 15 different languages – Arabic, Cambodian, Chinese, English, Farsi, Hindi, Japanese, Korean, Pashto, Russian, Spanish, Tagalog, Thai, Vietnamese and Western Armenian.

An exposure notification will be sent to your phone after your phone detects an exposure event based on a key/token match with someone who has reported positive in CA Notify. It takes less than a day to be notified if someone you’ve been exposed to submits their positive result in CA Notify. You can be notified of any exposure that happened within the last 14 days.

It depends on how many people you interact with, how many individuals use Exposure Notifications on their phones, and how many of them have a positive diagnosis.

If your phone has exchanged the randomly generated keys with the phone of someone who has reported a positive diagnosis, you will receive notification of possible exposure. This notification will include instructions on self-isolation and testing.

You will receive the code via text message from CDPH. The text from CDPH will come from 1-855-976-8462.

All iPhones released starting in 2015 support iOS 12.5: iPhone 12, 12 Mini, 12 Pro, 12 Pro Max, 11, 11 Pro, 11 Pro Max, XR, XS, XS Max, X, SE (2nd generation), 8, 8 Plus, 7, 7 Plus, 6s, 6s Plus, 5s, 5s Plus, SE (1st generation).

Android users can use CA Notify if their phone supports Bluetooth Low Energy, Android Version 6 (API 23) or above, and can access the Google Play Store. For further questions concerning Exposure Notifications, please visit

The service was designed to use Bluetooth and data minimally and should not have a noticeable impact on battery life or data usage.

CA Notify uses Bluetooth Low Energy, so Bluetooth must always be active for the system to exchange keys with other users nearby.

No. CA Notify is not a contact tracing app. Contact tracing identifies the close contacts of someone who has tested positive for COVID-19, and contact tracers reach those individuals by phone, email and text. CA Notify does not track or trace information about the people you are in contact with and the app doesn’t collect or exchange any personal information, so it isn’t possible for any entity to know who you have been in contact with. CA Notify augments the contact tracing process by issuing exposure notifications to people you may not even know.

No, CA Notify is a free tool and available to all Californians who choose to use it.

CA Notify is not intended for children under the age of 13. Users between the ages of 13 and 17 can only use the system after the parent or legal guardian has reviewed and provided consent.

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Need technical support?
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1 (888) 421-9457