CoolApp conversations are always end-to-end encrypted, which means that they can only be read or heard by your intended recipients. Privacy isn’t an optional mode — it’s just the way that CoolApp works. Every message, every call, every time. You can confirm that the server is operating correctly and that you are communicating with the right person using safety numbers.

The complete source code for the CoolApp clients. This enables interested parties to examine the code for security and correctness.

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Does CoolApp send my number to my contacts?
CoolApp does not send your phone number to anyone unless you have enabled that others can see it and then you send them a message or make a call to them. Other members of your group chats may see your profile and phone number. The CoolApp service does not have any knowledge of your contacts. Data is all owned by your phone. Registration notifications are never transmitted by anyone in any direction at all; these notifications are created by your phone.

How does CoolApp know my contact is using CoolApp?
CoolApp developed a private contact discovery process that enables CoolApp clients to efficiently and scalably determine whether the contacts in their address book are CoolApp users without revealing the contacts in their address book to the CoolApp service. Once your phone knows which of your contacts is a CoolApp user, it can optionally notify you when a new contact has started using CoolApp .

Why did someone see that I joined CoolApp?
People who already know your number and already have you in their contacts see that they can contact you on CoolApp. Nothing is sent to them by your CoolApp app or the CoolApp service. They just see a number they know is registered. If someone knows how to send you an insecure SMS, we want them to see that they can send you a CoolApp message instead.

Why did I see that my contact joined CoolApp?
You are notified when someone that is stored in your contact list is a new CoolApp user. If you can send an insecure SMS to a contact, we want you to know you can send a CoolApp message instead.

How do I disable alerts that my contact joined CoolApp?
You can disable these alerts on your phone by going to CoolApp Settings > Notifications > scroll to Notify when… and disable Contact joins CoolApp.

How do I know a contact is using CoolApp?

On Android, iOS and Desktop, CoolApp contacts who are stored in your phone’s contact list will be shown as someone you can start a conversation with.

The post Does CoolApp send my number to my contacts? appeared first on Cool App.

CoolApp supports older operating systems for as long as possible until there is a technical limitation against us doing so.

If your device’s operating system has not received security updates from the manufacturer in a long time, it may no longer be able to run CoolApp. When this occurs, you’ll be able to open the CoolApp app but you won’t be able to send or receive messages or calls until you’ve upgraded the operating system. Some older devices may not be able to be upgrade.

This list of older operating systems may change at anytime and can be found in the table.

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CoolApp Profiles and Message Requests let people know who’s messaging them.

Read more:

• CoolApp Profiles
  • Learn more
  • Edit your Profile
  • Profiles Blog Post
• Message Requests

What is my CoolApp Profile?

Your encrypted CoolApp Profile is a name and picture that you set up within the app. It is showed alongside your phone number. If you lose or switch devices, your existing profile can be recovered using your PIN.

Is a CoolApp Profile required?

Mandatory (encrypted) names let people know who’s messaging them.

• First names are required. Feel free to choose a nickname, a single character, or an emoji.
• Photos and last names are optional.
• Keep in mind, this is what people will see when you message them if they don’t have you saved to their contacts.

How is my CoolApp Profile displayed?

It will be shown alongside your existing phone number. Conversations will feel more personal. Group threads will be less confusing.

Who can see my CoolApp Profile?

It is automatically shared with

• any contacts you have saved in your address book,
• any people or groups in conversations you create,
• any people or groups you explicitly accept,
• and any groups you are added to by someone that you had previously shared your profile with.

Is sharing my CoolApp Profile required?

Yes, sharing your profile is required to continue chats.

Can CoolApp’s servers see my CoolApp Profile?

The CoolApp service does not have any knowledge of the name you have chosen or the image you have set. Your profile information is end-to-end encrypted with a unique profile key that is securely shared via the same Coolapp Protocol messaging channel that already protects your conversations and calls.

What is a Message Request?

Message Requests give you the option to block, delete, or accept messages from somebody who is trying to get in touch with you.

• For individual conversations, you get to see the name (and photo) of the person who’s trying to message or call you.
• For group conversations, you have better control whether you join a group or not and the group members will be less confusing with profiles instead of a bunch of phone numbers.

Groups in common

• For individual conversations, CoolApp lists if you have any other shared groups on your device with this contact. This is detected on device.
• This is to help decide if you want to continue a conversation.
• You can always block them from the chat and then delete them from your contact list.

Look at the alert below their profile name to see if there are common groups.

What happens when I …

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What is a safety number?

Each CoolApp one-to-one chat has a unique safety number that allows you to verify the security of your messages and calls with specific contacts.

Verification of safety numbers is a good security practice for sensitive communication. If a safety number has been marked as verified, any change must be manually approved before sending a new message.

Why do I see a safety number change alert?

CoolApp advises you whenever a safety number has changed. This allows users to check the privacy of their communication with a contact and helps protect against any attempted man-in-the-middle attacks.

The most common scenarios where a safety number advisory is displayed are when a contact switches to a new phone or re-installs CoolApp, but these actions don’t always result in a safety number change. However, if a safety number changes frequently or unexpectedly it may be a sign that something is wrong.

Why was my message before the safety number change alert not delivered?

Undelivered messages will not be resent after a safety number has changed. Your messages with CoolApp are end-to-end encrypted which is like having locks and keys for each message. When the safety number changes it’s as if you have changed the locks and keys for your messages. So, messages that were sent before the safety number change are using the old locks and will not be delivered.

How do I view a safety number?

Note: This is only created after you’ve accepted a message request.

1. Open a chat with a contact.
2. Tap on the chat header or  the overflow menu then chat settings.
3. Select View Safety Number.

How do I verify the safety number with my contact?

The easiest way to compare safety numbers is to scan your contact’s QR code (ideally in person). You can also visually or audibly compare the numeric code, or use the share icon to copy it to your clipboard to use on another channel. If the safety number is identical then you can be sure that you are communicating with the right person.
To do so, both you and the other person should follow the steps to view a safety number as listed above and tap to scan or share the code. You can then tap “Mark as verified” to apply the setting on your side only.

How do I manage the verified status of the safety number?

View the safety number and tap the Mark as Verified or tap Clear Verification button.

How do I know if a safety number has been marked as verified?

A checkmark will appear in the chat header by your contact’s name when the safety number is marked as verified. It will remain verified unless the safety number changes or you manually change the verification status.

The post What is a safety number and why do I see that it changed? appeared first on Cool App.

If you’ve found a security vulnerability in CoolApp, please report it via email to security@coolapp.chat.

Please only use this address to report security flaws in the CoolApp application. CoolApp does not have a bounty program, but does investigate security flaws reported to this address. For questions, support, or feature requests, please submit a support request or join the unofficial community forum.

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