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Alert notification tools with a free plan in 2026

Push, chat and messaging services that deliver an alert to a phone or a channel. This list has 13 alert notification tools. Of these, 11 are open source, 13 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

    Pocket Alert

    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
  9. 9

    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
  10. 10

    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
  11. 11

    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
  12. 12

    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
  13. 13

    SIGNL4

    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

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-
Pocket Alert Free plan 50 messages a day, 1 device No No Yes----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
SIGNL4 Free plan Up to 5 users, push alerts No No YesYesYesYesYesYesYesYes

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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