# Activity Feeds & Chat Messaging

* [PubNub](#pubnub)
* [Pusher](#pusher)
* [Stream](#stream)

## PubNub

[Pricing page](https://www.pubnub.com/pricing/)

* *Free tier*: Unlimited channels, 100 max devices, 1 million messages/month, support
* *Pros*: Send and receive messages and signals to any device in under 0.25 seconds worldwide. 70+ Realtime SDKs. Wonderful docs, and dashboard. Add on features such as BLOCKS (Serverless compute for building and scaling realtime applications.), Presence, Storage, Push Notifications, Analytics, and Access Management.

## Pusher

[Pricing page](https://pusher.com/channels/pricing)

* *Free tier*: Unlimited channels, 100 max connections, 200,000 messages a day, support
* *Pros*: Send messages from your server and subscribe to them in real-time from any client (Android, iOS, JavaScript, etc.) at massive scale (Pub/Sub). Great documentation, intuitive client libraries, and a powerful dashboard for testing, debugging, and analytics. Libraries available for various languages.

## Stream

[Pricing page (Chat)](https://getstream.io/chat/pricing/) [Pricing page (Activity Feeds)](https://getstream.io/activity-feeds/pricing/)

* *Free tier*: 2k MAU on Chat / 9 million feed updates/month for Feeds with the [Maker Account](https://getstream.io/maker-account/)
* *Pros*: REST API + SDK Support for major languages and frameworks. Highly scalable infrastructure that powers experiences for over a billion users.
* *Limitations*: The Maker Account is limited to companies with five or less team members, less than $10k in monthly revenue and have taken less than $100k in funding.