Activity Feeds & Chat Messaging
PubNub
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
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) Pricing page (Activity Feeds)
Free tier: 2k MAU on Chat / 9 million feed updates/month for Feeds with the 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.
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