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Open source alert notification tools in 2026

Push, chat and messaging services that deliver an alert to a phone or a channel. This list has 11 alert notification tools. Of these, 11 are open source, 11 have a free plan and 11 can be self-hosted. Checked by hand on 30 September 2026.

  1. 1

    Apprise

    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
  2. 2

    Bark

    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
  3. 3

    Botkube

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

    Free Open source (MIT) Self-hosted maintenance ChatOpsKubernetesNotifications
  4. 4

    Gotify

    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
  5. 5

    Kubewatch

    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
  6. 6

    Mailrise

    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
  7. 7

    ntfy

    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
  8. 8

    Prometheus Alertmanager

    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
  9. 9

    prometheus-msteams

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

    Free Open source (MIT) Self-hosted Notifications
  10. 10

    PushBits

    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
  11. 11

    Shoutrrr

    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

Side by side

Tool Pricing Free plan Open source Self-hosted Mobile pushSMSVoice callsEmailChat appsHTTP API or webhook ingestBypass silent modeAcknowledgement
Apprise Free Yes Yes Yes YesYesYesYesYesYesYesNo
Bark Free Yes Yes Yes YesNoNoNoNoYesYesNo
Botkube Free Yes Yes Yes NoNoNoNoYes-NoNo
Gotify Free Yes Yes Yes YesNoNoNoNoYes-No
Kubewatch Free Yes Yes Yes NoNoNoYesYesNoNoNo
Mailrise Free Yes Yes Yes YesYesYesYesYesNoYesNo
ntfy Free plan Public server usable without sign-up Yes Yes Yes-YesYes-YesYes-
Prometheus Alertmanager Free Yes Yes Yes YesYes-YesYesYesYesNo
prometheus-msteams Free Yes Yes Yes NoNoNoNoYesYesNoNo
PushBits Free Yes Yes Yes -NoNoNoYesYes-No
Shoutrrr Free Yes Yes Yes YesNoNoYesYesNo-No

Yes: confirmed in the tool's documentation. No: documented as not offered. -: not confirmed. Plans and prices change; check each tool's own site before you decide.

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