No moat. Still in business.

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Runs automated tests against your APIs and websites after each deploy and on a schedule, with alerts on failure.

Since 2016

Uptime and monitoring · Developers

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Watches web pages for changes and sends alerts or scraped data to Slack, Discord, Telegram or Google Sheets without code.

Since 2019

Free plan · Uptime and monitoring

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Sends engineering teams a daily summary of AWS and Azure spending changes by Slack, Teams or email.

Since 2018

Subscription · Uptime and monitoring · Developers

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Sends alerts to on-call staff, handles their rotas and runs status pages so tech teams can respond to outages quickly.

Since 2020

Free trial · Uptime and monitoring · Developers

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Watches your sites, certificates, DNS records and scheduled tasks around the clock and tells your team as soon as something fails.

Since 2024Updated 4 months ago

Subscription · Uptime and monitoring · Developers

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Open-source error tracker that ranks frontend bugs from errors and session replays and opens fix pull requests on GitHub.

Since 2024

Uptime and monitoring · Developers

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Monitors websites, servers, cron jobs, DNS records and SSL certificates, with alerts and public status pages.

Since 2024

Free plan · Uptime and monitoring · Developers

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Hosted status pages with built-in uptime checks, so you can keep customers informed during outages and cut support tickets.

Free plan · Uptime and monitoring · Software companies

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Tracks domain renewals, SSL certificates and DNS records for many sites and alerts you before something lapses or breaks.

Since 2024

Subscription · Uptime and monitoring · Agencies

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Posts a Slack alert when Apple or Google approves or rejects your app, or a TestFlight build is ready.

Since 2023

Subscription · Uptime and monitoring · Developers

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Logs errors from .NET and JavaScript apps, checks site uptime and scheduled jobs, and notifies your team in chat or email.

Free trial · Uptime and monitoring · Developers

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WordPress plugin that alerts you in Slack, Discord or email when posts change, users sign up or plugins update.

Free plan · Uptime and monitoring

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Sends messages from your scripts, servers or webhooks straight to the Pocket Alert app on your iPhone or Android phone.

Since 2024

Free plan · Uptime and monitoring · Developers

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Watches your SSL certificates and sends alerts well before they expire, with automatic host discovery.

Since 2022

Free plan · Uptime and monitoring · Developers

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Alerts you when a cron job misses its ping or a site, certificate or domain has a problem, with status pages included.

Free plan · Uptime and monitoring · Agencies

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Watches Linux and Windows servers and website uptime from many locations, finds running services itself and sends alerts.

Free plan · Uptime and monitoring · Developers

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Checks your websites for downtime and slow responses and sends alerts by email, SMS or Slack, with uptime logs.

Free plan · Uptime and monitoring

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Records user sessions and catches front end errors in web and mobile apps so product and dev teams can fix bugs faster.

Since 2022

Free trial · Website analytics · Developers

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Watches web pages for you and sends an alert when content, prices or stock levels change.

Subscription · Uptime and monitoring

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Checks websites, APIs and cron jobs every 30 seconds and confirms an outage before alerting your team.

Subscription · Uptime and monitoring · Developers

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Monitors websites and Linux servers, sends alerts by email, SMS or call, and hosts branded status pages on your domain.

Free plan · Uptime and monitoring · Developers

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Platform for AI teams to trace, simulate and evaluate their LLM agents and keep track of model spend.

Uptime and monitoring · Developers

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Tells developers when scheduled jobs, agents, websites or APIs fail or run late, and hosts status pages for customers.

Free plan · Uptime and monitoring · Developers

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Watches any web page and alerts you by email, phone or chat when it changes, such as a price drop or a new job post.

Free plan · Uptime and monitoring

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Records what happens on your WordPress sites in a hosted log and sends alerts by email or Slack, built for agencies.

Free trial · Uptime and monitoring · Agencies

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Shows where GitHub Actions minutes and money go by repo, workflow and step, and flags slow or failing runs to fix.

Since 2025

Free plan · Uptime and monitoring · Developers

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An AI on-call helper that looks through logs, metrics and code to find why production broke and suggest fixes.

Since 2026

Free plan · Uptime and monitoring · Developers

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Self-hosted tool that uses AI to look into each Kubernetes alert and sends a root cause report to Slack.

Since 2026

Uptime and monitoring · Developers

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Watches dead letter queues in RabbitMQ and Kafka, alerts on stuck consumers or spikes, and lets engineers replay failed messages.

Since 2026

Uptime and monitoring · Developers

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Log monitor that runs in your own cloud, spots incidents and sends alerts with likely causes to Slack or PagerDuty.

Since 2026

Free plan · Uptime and monitoring · Developers

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Runs incidents from alert to postmortem for engineering teams, with on-call rotas, escalations and status pages included.

Free plan · Uptime and monitoring · Developers

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Sends you an alert by email, Slack, Discord, Teams, Pushover or webhook soon after Apple releases an iOS or macOS update.

Since 2025

Free · Uptime and monitoring

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Runs ping, traceroute, DNS, MTR and HTTP checks from probes around the world, for network and web engineers.

Since 2026

Free · Uptime and monitoring · Developers

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Get an alert by email, Slack or SMS when your WordPress site throws an error, with the plugin, page and backtrace that caused it.

Free plan · Uptime and monitoring · Agencies

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Self-hosted on-call paging that pulls commits, logs and metrics when an alert fires and explains the likely cause.

Free · Uptime and monitoring · Developers

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Open source uptime checks, alerts and public status pages that you or an AI agent can manage, with no charge per monitor.

Free plan · Uptime and monitoring · Developers

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Uptime checks for sites, APIs, databases and queues you run on your own server, with alerts and public status pages.

Free · Uptime and monitoring · Developers

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An AI agent for on-call engineers that triages alerts, finds the root cause and proposes code fixes with reproduction tests.

Since 2026

Uptime and monitoring · Developers

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Alerts you by email, Slack or a ticket when a cron job, backup or pipeline misses its expected check-in.

Since 2026

Free plan · Uptime and monitoring · Developers

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Watches your Supabase project for stale, changed or wrong data, explains the cause and suggests a fix.

Since 2026

Uptime and monitoring · Developers

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Spots DDoS attacks on your servers within a second and triggers firewall, BGP or scrubbing responses.

Since 2026

Subscription · Uptime and monitoring · Developers

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Mac app that pulls builds, deploys, pull requests and errors into one small inbox and hands fixes to a coding agent.

Since 2026

Free plan · Uptime and monitoring · Developers

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Product analytics for web and mobile apps with session replay, funnels, heatmaps and crash tracking from a small SDK.

Since 2026

Free plan · Website analytics · Developers

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Checks whether your website can be reached from 43 countries and alerts you by Telegram, Slack or email when it is blocked.

Since 2025

Subscription · Uptime and monitoring

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Watches scheduled jobs and websites by waiting for a ping from each run, then alerts you on Telegram or Slack when one is late.

Free plan · Uptime and monitoring · Developers

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An AI agent that looks into production alerts, finds the likely root cause and prepares fixes for engineering teams.

Since 2026

Free plan · Uptime and monitoring · Developers

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Error tracking and product analytics that works with your current Sentry SDK and lets coding agents read issues to fix them.

Free plan · Uptime and monitoring · Developers

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Watches your AI agent's real traffic, finds where it fails customers and opens tested pull requests with fixes.

Since 2026

Subscription · Uptime and monitoring · Developers