Amazon SNS vs Gotify

Amazon SNS is a managed publish/subscribe service for sending messages between applications and reaching people. It can deliver notifications to application endpoints and send SMS, mobile push, and email. Standard topics support nearly unlimited messages per second with best-effort ordering and deduplication; FIFO topics preserve order and prevent duplicate delivery within five minutes, with limits of 3,000 messages per second or 10 MB per second per topic. Publishers can batch 1 to 10 messages per request, while subscribers can filter notifications. Integrations include AWS event sources and destinations such as SQS, Data Firehose, Lambda, and HTTPS. Each message can contain up to 256 KB; the Extended Client Library can store payloads up to 2 GB in S3 and publish an object reference. SNS retries delivery and supports dead-letter queues. The free tier includes 1 million requests, 100,000 HTTP notifications, and 1,000 email notifications each month. Listed paid rates include $0.50 per month for API requests, $0.06 for HTTP deliveries, and $2.00 for email deliveries; charges depend on usage.

Gotify is free, open-source software for sending and receiving messages through a self-hosted server. The server includes a WebUI for managing users, clients, and applications. Messages can be sent through a REST API and received over a WebSocket connection; each includes content, a title, creation date, application ID, and priority. Priority can affect how clients present a message, including whether the Android app plays a notification sound. The Android client subscribes to the server’s message stream and displays push notifications. Optional plugins can add webhook reception, feed polling, WebUI extensions, or alarm notifications, but plugins are currently supported only on Linux and macOS due to a Go limitation. Gotify supports OpenID Connect single sign-on when the identity provider supports PKCE, as well as TLS configuration, secure session cookies, and bcrypt password hashing. Sensitive actions require session elevation. The server can run in Docker or from a platform-specific binary; Docker images support amd64, i386, arm64, armv7, and riscv64. An optional command-line client can push messages, though any HTTP client can do so. Its listed plan is free.