Messaging & Streaming

Ably

Realtime messaging service with presence, persistence and guaranteed delivery. The free plan includes 3m messages per month, 100 peak connections, and 100 peak channels.

https://www.ably.com/

cloudamqp.com

RabbitMQ as a Service. Little Lemur plan: max 1 million messages/month, max 20 concurrent connections, max 100 queues, max 10,000 queued messages, multiple nodes in different AZ's

https://www.cloudamqp.com/

courier.com

Single API for push, in-app, email, chat, SMS, and other messaging channels with template management and other features. The free plan includes 10,000 messages/mo.

https://www.courier.com/

EMQX Serverless

Scalable and secure serverless MQTT broker you can get in seconds. 1M session minutes/month free forever (no credit card required).

https://www.emqx.com/en/cloud/serverless-mqtt

Engage

All-in-one Customer Engagement and Automation Tool (email, push, SMS, product tours, banners and more) for SaaS. Free for up to 1,000 active users per month.

https://engage.so/

engagespot.co

Multi-channel notification infrastructure for developers with a prebuilt in-app inbox and no-code template editor. Free plan includes 10,000 messages/mo.

https://engagespot.co/

HiveMQ

Connect your MQTT devices to the Cloud Native IoT Messaging Broker. Free to connect up to 100 devices (no credit card required) forever.

https://www.hivemq.com/mqtt-cloud-broker/

httpSMS

Send and receive text messages using your Android phone as an SMS Gateway. Free to send and receive up to 200 messages per month.

https://httpsms.com

knock.app

Notifications infrastructure for developers. Send to multiple channels like in-app, email, SMS, Slack, and push with a single API call. The free plan includes 10,000 messages/mo.

https://knock.app

Novu.co

The open-source notification infrastructure for developers. Simple components and APIs for managing all communication channels in one place: Email, SMS, Direct, In-App and Push. The free plan includes 30,000 notifications/month with 90 days of retention.

https://novu.co

Pingram.io

Communication infrastructure in 5 minutes. Free tier includes: 100 SMS and calls, 3000 Emails, Push, Slack, MS Teams, WhatsApp, and more.

https://www.pingram.io/

Pocket Alert

Send push notifications to your iOS and Android devices. Effortlessly integrate via API or Webhooks and maintain full control over your alerts. Free plan: 50 messages per day to 1 device and 1 application.

https://pocketalert.app

pusher.com

Realtime messaging service. Free for up to 100 simultaneous connections and 200,000 messages/day

https://pusher.com/

scaledrone.com

Realtime messaging service. Free for up to 20 simultaneous connections and 100,000 events/day

https://www.scaledrone.com/

SMSGate

SMS Gateway for Android™ enables sending and receiving SMS messages through your devices using cloud routing. Completely free cloud service (with recommended notification for usage above 10,000 messages/day to maintain quality for all users).

https://sms-gate.app

SuprSend

SuprSend is a notification infrastructure that streamlines your product notifications with an API-first approach. Create and deliver transactional, crons, and engagement notifications on multiple channels with a single notification API. In free plan you get 10,000 notifications per month, including different workflow nodes such as digests, batches, multi-channels, preferences, tenants, broadcasts and more.

https://www.suprsend.com/

synadia.com

NATS.io as a service. Global, AWS, GCP, and Azure. Free forever with 4k msg size, 50 active connections, and 5GB of data per month.

https://synadia.com/ngs

webpushr

Web Push Notifications - Free for upto 10k subscribers, unlimited push notifications, in-browser messaging

https://www.webpushr.com/

vask

Realtime messaging service, Pusher-compatible. Dev tier is limited to local development only and free with 100 concurrent connections, 1,000,000 broadcasts/month, unlimited client events, 32kb message size.

https://vask.dev