No moat. Still in business.

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Crawls your website to spot dead, mistyped and harmful links, and reports which ones need fixing.

Since 2011

Uptime and monitoring

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Buys, installs and renews SSL certificates automatically and watches for certificates issued for your domains.

Since 2016

Subscription · Uptime and monitoring · Developers

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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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Always-on profiling of CPU, GPU and memory in production so engineers can find slow code and cut server costs.

Since 2021

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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Tracks Core Web Vitals and Lighthouse scores across many sites and URLs so teams can find and fix slow pages.

Since 2020

Uptime and monitoring · Online sellers

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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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Runs browser and API checks against your app from many regions and alerts you when they fail, set up as code.

Since 2021

Free plan · 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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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 servers, containers and cloud services from one agent, with dashboards, alerts and logs for teams without ops staff.

Free trial · Uptime and monitoring · Online sellers

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Watches your analytics and ad tags, catching missing events, broken conversions and consent breaches for marketing and data teams.

Website analytics · Online sellers

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WordPress plugin that times your server's processor, RAM, database, disk and network to rate your host, on demand or on a schedule.

Uptime and monitoring

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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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Shows Rails teams which requests are slow, flags N+1 queries and SQL timings, and tracks errors in one dashboard.

Free plan · Uptime and monitoring · Developers

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Tracks website uptime, speed and Core Web Vitals, and helps you find out why a page slowed down or failed.

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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AI agents for engineering teams that look into alerts across logs, metrics and code to find why systems broke.

Since 2023

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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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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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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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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Web and desktop interface for browsing, troubleshooting, monitoring and governing Apache Kafka data streams.

Since 2023

Free plan · Uptime and monitoring · Developers

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Runs regular speed tests on your connection and keeps a history so you can check your ISP delivers what it promised.

Free · Uptime and monitoring · Individuals and families

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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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Checks your websites, SSL certificates, DNS and domains every 30 seconds and alerts you when something breaks or expires.

Free plan · Uptime and monitoring · Agencies

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A free personal URL that emails you when a script, cron job or build calls it, for developers who want simple alerts.

Free · 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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A free status page you host yourself to tell customers about outages, incidents and planned maintenance.

Free · Uptime and monitoring · Software companies

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Collects traces, metrics and logs through OpenTelemetry for engineering teams, hosted or on your own servers.

Since 2022

Free trial · 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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Hosted service that runs scripted HTTP API tests on a schedule or in CI so teams know their endpoints still work.

Since 2024

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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A WordPress plugin that takes daily screenshots of chosen pages and flags visual changes after core or plugin updates.

Free plan · Uptime and monitoring · Agencies

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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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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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Watches any web page for changes, such as competitor prices or policy updates, and tells you in plain words what changed.

Free plan · Uptime and monitoring

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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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Notifies you when backups, reports or other scheduled tasks stop pinging their unique URL on time.

Free plan · Uptime and monitoring · Developers

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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 the status pages of thousands of outside services and alerts you when the ones you depend on go down.

Since 2024

Free plan · 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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Runs your UniFi network controller in the cloud with backups, updates, monitoring and support, for IT teams and installers.

Since 2023

Free plan · Uptime and monitoring