No moat. Still in business.

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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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Watches your app's Claude API calls and points out waste, such as repeated prompts or oversized models, with suggested fixes.

Uptime and monitoring · Developers

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Watches your DNS for dangling records, subdomain takeover risks, SPF limits and expiring certificates.

Free plan · Uptime and monitoring · Developers

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A desktop and web app that finds resources across AWS, GCP, Azure and other clouds and lets infra teams work on them in one place.

Since 2026

Free plan · Uptime and monitoring · Developers

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Monitors website speed using real visitor data, Chrome field data and scheduled page tests.

Since 2017

Free trial · Website analytics · Online sellers

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Monitors website uptime from several countries, tries automatic recovery, and calls or texts you if the problem stays.

Subscription · 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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Catches errors in live software, shows session replays and deploys, and can open a tested pull request with a fix for you to review.

Free plan · Uptime and monitoring · Developers

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Cookieless website analytics that reports human and bot traffic apart and checks whether your site is up.

Free plan · Website analytics

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Finds hosts under your domains from certificate logs, watches their SSL certificates and warns you before they expire.

Free trial · Uptime and monitoring · Developers

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Ties logs and traces from iOS and Android apps to backend services so app teams can trace a user problem to its cause.

Uptime and monitoring · Developers

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Lets engineers reach, reboot, monitor and move files to remote Linux IoT devices from the cloud.

Uptime and monitoring · Developers

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Shows PHP, MySQL and server stats in the WordPress admin, with labels for staging and live sites.

Free plan · Uptime and monitoring · Agencies

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

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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Discovers, renews and deploys SSL certificates across servers and appliances for IT teams and MSPs, then watches for expiry.

Subscription · Uptime and monitoring · Developers

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Watches your own or third-party web pages and alerts you to changes that matter.

Since 2019

Free trial · Uptime and monitoring

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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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Scans a domain's DNS and email setup, including SPF, DKIM and DMARC, and explains what failed and how to fix it.

Free plan · Uptime and monitoring

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Traces AI agent runs in production, flags silent failures and lets teams test changes in simulation before release.

Since 2025

Free plan · Uptime and monitoring · Developers

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Checks websites and APIs from several regions, alerts whoever is on call and runs a public status page.

Free plan · Uptime and monitoring · Agencies

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A free status page and uptime monitor you run in Docker, with incident updates, maintenance plans and subscriber notices.

Free · Uptime and monitoring · Developers

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Checks your websites, SSL, ports and cron jobs, confirms outages from other regions and runs status pages on your domain.

Since 2024

Free plan · Uptime and monitoring · Online sellers

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AI agents use your live web app like a real user, following set flows or exploring, and email you when something breaks.

Free plan · Uptime and monitoring · Developers

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Watches SSL certificate expiry and site uptime every day and only emails you when something changes, free for up to five sites.

Free plan · Uptime and monitoring

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Gathers status updates from thousands of cloud services you depend on, warns you about outages and shows them on one page.

Uptime and monitoring · Software companies

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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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Checks SSL certificates for expiry, trust and chain problems, and emails you before a certificate runs out.

Free plan · Uptime and monitoring · Developers

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Dashboard for email sent through Amazon SES showing bounces, deliveries, complaints, opens and clicks, run yourself or hosted.

Free · Transactional email · Developers

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Observability built on OpenTelemetry for software teams, covering logs, traces, dashboards and alerts with cost control.

Since 2024

Free trial · Uptime and monitoring · Developers

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Checks your website, APIs, TCP services, background jobs, SSL and domain renewal, and alerts you when something fails.

Free plan · Uptime and monitoring · Developers

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Open source tracing, evals, guardrails and prompt management for AI agents, built on OpenTelemetry and free to self-host.

Free · Uptime and monitoring · Developers

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Watches MySQL, PHP-FPM, Varnish and NGINX servers in one dashboard with alerts, as a swap in replacement for NGINX Amplify.

Free plan · Uptime and monitoring · Developers

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A proxy that watches AI agent calls, spots runaway loops and blocks requests once a spending limit is hit.

Free plan · Uptime and monitoring · Developers

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Checks lists of up to 100,000 URLs in the cloud, retries links that block bots, and can run scheduled broken link checks.

Subscription · 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.

Free · Uptime and monitoring · Developers

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Tracks errors in your web apps and passes stack traces to AI coding agents over MCP so developers can fix them faster.

Free plan · Uptime and monitoring · Developers

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Schedules timed tasks, watches that your jobs and sites stay up, and checks email addresses, for apps on serverless hosts and AI agents.

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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Scans your network and keeps diagrams and a device inventory up to date for IT teams, with a free self-hosted edition.

Free plan · Uptime and monitoring · Software companies

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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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Manage ESP32 and nRF91 device fleets: push config and firmware updates, graph readings and get email alerts.

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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Sends you an email when a cron job, backup or background worker misses its expected check-in or reports failure.

Uptime and monitoring · Developers

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Finds wasteful logs and telemetry in your source code and opens pull requests to cut observability bills for engineering teams.

Uptime and monitoring · Developers

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Gives each scheduled task a URL to call when it runs and alerts you if the call never arrives.

Free trial · Uptime and monitoring · Developers

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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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Server monitoring for teams with cloud or dedicated machines. Install with one command, and get alerts only when a person needs to act.

Free plan · Uptime and monitoring · Developers