Klaxon Hub
Alerts from your own servers
Free
Hear it before your users do. Anything that can call a URL can ring your iPhone, iPad or Mac: from your own server, or none at all.
Klaxon turns anything that can call a URL into an alert on your iPhone or iPad.
Point it at a hub you run yourself and every service you operate can reach you: a failed deploy, a crashed worker, a backup that didn't finish, a disk filling up. No server? Klaxon can give you a hosted webhook URL that rings your phone with nothing to install.
• ONE WEBHOOK URL. Paste it into anything: Grafana, Discord, cron, a shell script. JSON, plain text or a bare GET.
• FIVE LEVELS THAT MEAN SOMETHING. From a quiet note in the feed to a critical page that breaks through Focus.
• SEE WHO'S ON IT. I'm on it, take over, add a note, mark it fixed. Every alert keeps its story, from the moment it went down to how it ended.
• HEARS WHAT STOPS TALKING. Heartbeats tell you when a job goes quiet: the alert nothing else can send.
• THE LOG COMES WITH THE ALERT. Attach a crash log or stack trace and read it right on your phone.
• DECLARE IT DOWN. Planned work or waiting on parts: say so, say when it's back, and Klaxon checks in instead of ringing.
• TEAMS. Join your team by invitation and everyone sees who has what.
• A NEW PHONE GETS EVERYTHING BACK. A locked backup under 24 words, kept in a file or in an optional, free Klaxon account with a passkey.
• YOUR DATA, YOUR BOX. Alert history lives on your own hardware.
The hub runs with one command on any machine with Docker, and the guide walks you through it: https://klaxonalerts.com/docs
Ratings & Reviews
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New: the Makers layout, for one person with many projects. In Settings › Layout, choose Makers and Klaxon opens on your projects: what needs you, what went quiet, what's paused and what's fine. The fix sits on the project's card, a long press pauses a whole project while you deploy, and your week is three numbers at the foot. Stock stays exactly as it was.
The developer, Christopher Radtke, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- User Content
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Christopher Radtke
- Size
- 10.5 MB
- Category
- Developer Tools
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Christopher Radtke