| Overview |
A realtime messaging infrastructure platform providing pub/sub, presence, and stream processing for applications at scale. |
Square's free invoicing tool for sending professional estimates and invoices with online payment acceptance. |
| Pricing |
Freemium (Free-$99/month) |
Freemium (Free + payment processing fees) |
| Key Features |
- Pub/sub messaging
- Presence
- Stream processing
- Webhooks
- MQTT support
- Message queuing
- History
- Global edge network
|
- Invoice creation
- Estimates
- Online payments
- Recurring invoices
- Progress invoicing
- Team management
- Reporting
- Mobile invoicing
|
| Pros |
- Enterprise-grade reliability
- Global edge network
- Protocol support
- Good documentation
|
- Free to use
- Easy setup
- Professional templates
- Square ecosystem
|
| Cons |
- Can be expensive
- Complex pricing
- Smaller community
- Learning curve
|
- Payment processing fees
- Limited customization
- Square ecosystem dependency
- Basic features
|
