# 消息与流处理 (Messaging and Streaming)

> 消息队列、事件流、推送通知和即时通讯服务的免费额度。
> 共 20 个免费服务。数据来源:https://github.com/ripienaar/free-for-dev(MIT)。更新时间:2026-09-10

- [Ably](https://www.ably.com/) — Realtime messaging service with presence, persistence and guaranteed delivery. The free plan includes 3m messages per month, 100 peak connections, and 100 peak channels.
- [cloudamqp.com](https://www.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
- [courier.com](https://www.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.
- [EMQX Serverless](https://www.emqx.com/en/cloud/serverless-mqtt) — Scalable and secure serverless MQTT broker you can get in seconds. 1M session minutes/month free forever (no credit card required).
- [Engage](https://engage.so/) — 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.
- [engagespot.co](https://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.
- [HiveMQ](https://www.hivemq.com/mqtt-cloud-broker/) — Connect your MQTT devices to the Cloud Native IoT Messaging Broker. Free to connect up to 100 devices (no credit card required) forever.
- [httpSMS](https://httpsms.com) — Send and receive text messages using your Android phone as an SMS Gateway. Free to send and receive up to 200 messages per month.
- [knock.app](https://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.
- [Novu.co](https://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.
- [Pingram.io](https://www.pingram.io/) — Communication infrastructure in 5 minutes. Free tier includes: 100 SMS and calls, 3000 Emails, Push, Slack, MS Teams, WhatsApp, and more.
- [Pocket Alert](https://pocketalert.app) — 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.
- [pubnub.com](https://www.pubnub.com/) — Swift, Kotlin, and React messaging at 1 million transactions each month. Transactions may contain multiple messages.
- [pusher.com](https://pusher.com/) — Realtime messaging service. Free for up to 100 simultaneous connections and 200,000 messages/day
- [scaledrone.com](https://www.scaledrone.com/) — Realtime messaging service. Free for up to 20 simultaneous connections and 100,000 events/day
- [SMSGate](https://sms-gate.app) — 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).
- [SuprSend](https://www.suprsend.com/) — 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.
- [synadia.com](https://synadia.com/ngs) — [NATS.io](https://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.
- [webpushr](https://www.webpushr.com/) — Web Push Notifications - Free for upto 10k subscribers, unlimited push notifications, in-browser messaging
- [vask](https://vask.dev) — 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.