# Built by a developer and a sysadmin

Oh Dear started in 2018 with two people. One builds websites; the other keeps servers running. Put those two views together and you cover the whole site, not just the half you think about.

The Dev

## Freek Van der Herten

Agency owner and prolific open-source developer. He cares about what visitors see: every feature, link, and page.

[freek.dev](https://freek.dev)

The Ops

## Mattias Geniar

Sysadmin with fifteen years in infrastructure and security. He thinks about what breaks a site with no code involved: servers, certificates, DNS.

[ma.ttias.be](https://ma.ttias.be)

We build every feature together. These two instincts just shape what we reach for next. Here's how it grew.

Dev-focused

Ops-focused

2018

[### Uptime monitoring

Checked from multiple locations, so you know the second your site goes down.

](https://ohdear.app/features/website-uptime-monitoring) [### Broken links

We crawl every page and flag the links that lead nowhere.

](https://ohdear.app/features/broken-page-and-mixed-content-detection)

[### Certificate monitoring

We warn you long before an SSL certificate expires.

](https://ohdear.app/features/continuous-certificate-monitoring) [### Mixed content

We catch assets loading over HTTP, so your padlock stays intact.

](https://ohdear.app/features/broken-page-and-mixed-content-detection)

2019

[### Status pages

Hosted pages that keep users in the loop when something breaks.

](https://ohdear.app/features/status-pages)

2020

[### Scheduled task monitoring

Know when a cron job runs late, fails, or stops running.

](https://ohdear.app/features/scheduled-task-monitoring)

[### Performance monitoring

Track how fast pages load and catch slowdowns early.

](https://ohdear.app/features/performance-monitoring)

2021

[### Monthly site reports

A clean monthly summary, delivered to your inbox.

](https://ohdear.app/docs/features/what-checks-does-oh-dear-perform)

[### DNS record monitoring

Get notified the moment a DNS record changes.

](https://ohdear.app/features/dns-monitoring) [### Application health monitoring

Watch CPU, memory, disk, and custom metrics from inside your app.

](https://ohdear.app/features/application-health-monitoring)

2022

[### Domain expiry monitoring

We watch your domain's expiry date so it never slips by.

](https://ohdear.app/features/domain-monitoring)

2023

[### Lighthouse & SEO monitoring

Automated audits track performance, accessibility, and SEO over time.

](https://ohdear.app/features/lighthouse-seo-monitoring)

2024

[### Sitemap monitoring

We read your sitemap and check every page in it is reachable.

](https://ohdear.app/features/sitemap-monitoring)

2025

[### Ping monitoring

Check any host answers a ping, from locations worldwide.

](https://ohdear.app/features/ping-monitoring) [### TCP port monitoring

Monitor any TCP port to confirm your services are reachable.

](https://ohdear.app/features/tcp-port-monitoring)

2026

[### AI-powered monitoring

Describe what working looks like in plain English; AI verifies it.

](https://ohdear.app/features/ai-monitoring)

[### DNS blocklist monitoring

We check whether your domain or IP lands on major blocklists.

](https://ohdear.app/features/dns-blocklist-monitoring)

••• More to come

These are the highlights, the milestones we're proudest of. We ship smaller features and fixes all the time; you'll find those in our [changelog](https://ohdear.app/changelog) and on the [blog](https://ohdear.app/news-and-updates).

## Two perspectives, one tool that watches everything

Monitor your site the way both a developer and a sysadmin would.