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Pricing & Payment
Explore How-To's and learn best practices from our knowledge base.
Can my PubNub account support multiple environments?
Can I add users to my account?
Can I delete or disable Free plans in my account?
How do I downgrade a paid plan to a free plan?
Can I delete my PubNub account to create a main new account for my company?
Why do I get the error, "[XYZ] is not enabled for this subscribe key"?
How do I enable add-on features for my keys?
Usage & Metrics
Where is PubNub's service status reported?
How are Messages Counted?
How are Active Devices Counted?
Pricing and Payment
Does PubNub provide a premium SLA?
Can I use PubNub for free?
How much does PubNub cost?
Do you count concurrent users?
When is upgrade to Pro Plan required?
See all 8 articles
What happens if usage exceeds my plan's limit?
Can you handle spike usage?
How do I change my credit card on file?
What payment methods are accepted?
Account Upgrades & Downgrades
Do I need to get new keys when upgrading plans?
What is PubNub?
How do I set the UUID?
Does PubNub use WebSockets or some other protocol?
Where do I get started learning PubNub?
How does PubNub work?
See all 6 articles
What is a channel?
What are valid channel names?
How many channels can I use?
What happens to messages published when no one is listening?
Can PubNub support millions of users and millions of channels?
Can I whitelist IPs for PubNub traffic?
Can I hide my application keys?
Can I Use PubNub with SSL (HTTPS)?
Is PubNub blocked by firewalls or antivirus software?
Can I use PubNub with AES?
See all 12 articles
Speed, Throughput & Latency
What is PubNub's average response time?
How fast can I publish messages?
How do I monitor latency from my location?
How many concurrent connections can I use?
What is PubNub response time in China?
Does PubNub support the UDP protocol?
Why use PubNub rather than push notifications?
Does PubNub use a lot of battery power?
How do I check network connectivity?
What is the subscribe cycle?
See all 23 articles
Publish & Subscribe
Can I use catchup to retrieve older messages?
Do I need to create a PubNub object to send each message?
How to use PubNub's scalable MQTT Interface
What add-on features are available in PubNub?
Does PubNub support HTTP Streaming & Pipelining?
See all 9 articles
Why am I receiving "execution calls exceeds" error when I run my Function event handler?
How do I create a Function that keeps an accurate count using some increment functionality?
How do I prevent a published message from actually being published?
Why do my Functions pause or stop running?
What if UUID is not specified or undefined?
How do I disable leave events?
What SDK versions support channel presence?
Does a subscribe trigger a join event immediately?
Is a join event triggered twice on the same UUID?
See all 26 articles
What SDK versions support message history?
Can I retrieve prior presence events?
What is detailedHistory()?
Which SDKs support the message history feature?
How many stored messages can be retrieved?
See all 18 articles
Can channels of different keys be multiplexed?
How do I change a list of subscribed channels?
Does channel multiplexing support multiple callbacks?
How many channels does multiplexing support?
Channel Groups *
Can I subscribe to a channel group with no channels?
How do I add a channel to a channel group?
How do I remove a channel from a channel group?
How do I subscribe to a channel group?
What are channel groups?
See all 11 articles
How do I enable wildcard subscribe for my PubNub keys?
How do I subscribe to a wildcard channel?
How many channel segments are supported with wildcard subscribe?
Mobile Push *
Can I send large messages via APN?
Can I use APNS and PubNub together?
Can I push to sandbox and production with the same key?
How do I register a device with a channel?
Can I set a time limit for a push notification?
See all 27 articles
Access Manager *
Can I make bulk access permission changes?
Does PubNub Access Manager apply to multiplexing?
Can I change a subscriber's auth key?
Does PubNub Access Manager apply to stored messages?
How long do granted access permissions last?
See all 20 articles
Publish & Subscribe *
Can I subscribe to multiple channels at the same time?
Should I use the restore setting?
What response is expected when publishing a message?
Can users receive messages on all pages of my site?
How do you retain received messages upon page reload?
See all 11 articles
How do I access messages published prior to subscribing?
How many messages can a channel contain?
How long are messages available?
How do I connect to multiple channels simultaneously?
Is a connection closed if I shutdown the PubNub object?
See all 7 articles
Message Payloads *
Can I publish in Unicode or Ascii?
How do I test the message size limit?
Can my account be configured for different message size limits?
Can I stream binary data through PubNub?
Can I send large messages with PubNub?
See all 12 articles
Design Patterns *
Does PubNub provide WebRTC and video chat?
How do I synchronize multiple devices?
Can I use PubNub to stream financial data?
Can I use PubNub to track moving objects?
How do I create device interaction on a geo grid?
See all 13 articles
When should I upgrade to a newer SDK version?
What client libraries (SDKs) are currently supported?
How can I create a new PubNub client SDK?
How are PubNub SDKs licensed?
User & Device Identity
How do I identify a device?
How do I detect dropped connections?
Does PubNub provide Webhooks?
What are messages and how are they counted?
What are Monthly Active Users?
Can I try PubNub Chat for free?
What is PubNub Chat?