Alerting

Notification delivery

Push, chat and messaging services that deliver an alert to a phone or a channel.

Lists: Alert notification tools in 2026 Best alert notification tools in 2026 Open source alert notification tools in 2026 Alert notification tools with a free plan in 2026 Self-hosted alert notification tools in 2026

14 of 14 tools Sort

Apprise github.com

Python library, CLI and API server that sends one notification to many services such as Telegram, Discord, Slack, email and SMS gateways using URL-style targets.

Free Open source (BSD-2-Clause) Self-hosted Notifications

Source code
Bark github.com

Open source iOS app for push notifications: send a request to a URL and it arrives as a push on your iPhone, through a server you can self-host.

Free Open source (MIT) Self-hosted NotificationsMobile app

Source code
Botkube botkube.io

Kubernetes ChatOps bot that posts cluster events and alerts to Slack, Discord or Mattermost and lets you run kubectl from chat.

Maintenance only Free Open source (MIT) Self-hosted ChatOpsKubernetesNotifications

Commercial Botkube Cloud ended 2024-11-05; open source edition continues but has had no commits since 2024-11-15. Source code
Gotify gotify.net

Self-hosted server for sending and receiving push messages over a REST API and websocket, with a web UI and an Android client.

Free Open source (MIT) Self-hosted NotificationsMobile app

Source code
Kubewatch github.com

Kubernetes watcher that reports resource changes in the cluster to Slack, Mattermost and other chat channels or to a webhook.

Free Open source (Apache-2.0) Self-hosted KubernetesNotifications

Source code
Mailrise github.com

SMTP gateway that turns incoming emails into Apprise notifications, so devices that can only send email alerts can reach push, chat and other services.

Free Open source (MIT) Self-hosted Notifications

Source code
ntfy ntfy.sh

HTTP-based pub-sub push service: POST a message to a topic URL and it arrives on phones and desktops through the ntfy apps. Use the public server, a paid plan, or self-host.

Free plan Free: Public server usable without sign-up Open source (Apache-2.0 OR GPL-2.0-only) Self-hosted NotificationsMobile app

Source code
Pocket Alert pocketalert.app

Push notifications to an iOS or Android app from a REST API, a webhook with JSON mapping, or integrations such as Grafana, Datadog and Prometheus.

Free plan Free: 50 messages a day, 1 device NotificationsMobile app
Prometheus Alertmanager prometheus.io

Receives alerts from Prometheus and compatible systems, then groups, deduplicates, silences and routes them to email, Slack, PagerDuty, webhooks and other receivers.

Free Open source (Apache-2.0) Self-hosted Alert routingNotifications

Source code
prometheus-msteams github.com

Small proxy that receives Alertmanager webhooks and forwards them as formatted cards to Microsoft Teams channels.

Free Open source (MIT) Self-hosted Notifications

Source code
PushBits pushbits.github.io

Self-hosted relay that delivers push notifications to you through Matrix, with an API similar to Gotify and Pushover.

Free Open source (ISC) Self-hosted Notifications

Source code
Pushover pushover.net

Push notification service with iOS, Android and desktop apps and a simple API supported by many monitoring tools, including an emergency priority that repeats until acknowledged.

Paid NotificationsMobile app
Shoutrrr containrrr.dev

Go library and CLI for sending notifications to services such as Slack, Discord, Telegram, email and Pushover through a single URL format.

Free Open source (MIT) Self-hosted Notifications

Source code
SIGNL4 signl4.com

Mobile alerting app that delivers alerts to the team on duty by push, SMS and voice call, with acknowledgements, duty scheduling and many monitoring integrations.

Free plan Free: Up to 5 users, push alerts NotificationsMobile appPhone and SMSOn-call schedules