Author
Jelle De Laender
Jelle founded Coding Mammoth in 2007, to work on his own ideas and projects like Semonto, QuickScale, MijnLijn and more. He also helps other companies to reach their objectives and goals, like Sketch. In his spare time, he is also interested in security research, AWS cloud hosting, macro photography, running, 3D printing and more. Get in touch with him!
Tips and Tricks
AI is flooding the web with content. But who is keeping it clean?
Are you pushing out content at scale? Then, you might leave behind a trail of error messages. Find out how to keep your site clean, fast, and reliable as AI floods the web.
Jelle De Laender - 4 September 2025
New
Reactive website monitoring is dead (Here’s what to do instead)
If you build websites, your clients expect them to perform well. Monitoring the websites you build is a must. But if you want a clear edge over the competition, you need to be even smarter about it.
Jelle De Laender - 20 August 2025
New
Localized pricing in Semonto
When you buy a digital product, you want to know the price in your own currency. That is why we are introducing local pricing in Semonto.
Jelle De Laender - 4 July 2025
Tips and Tricks
How to choose the best website monitoring tool for your company (7 questions to help you decide)
With so many website monitoring tools on the market, it can be hard to know how to pick the best one for you. In this guide, we’ll walk you through the most critical factors to consider when choosing a website monitoring tool.
Jelle De Laender - 19 June 2025
Use Case
NEW in Semonto: link team members to notifications
In Semonto, you can select which team members must receive an e-mail when a website or server has issues. The way to do this just got easier.
Jelle De Laender - 24 April 2025
Tips and Tricks
News: Why TLS/SSL certificates get shorter lifespans — and how to prepare for them
Each TLS/SSL certificate has an expiration date: the date when the certificate is no longer valid. At the CA/Browser Forum, a group of certification authorities and web browser vendors voted to reduce the maximum lifetime of certificates to 47 days by March 2029. Let’s dive into this and see how Semonto can help you stay in control.
Jelle De Laender - 18 April 2025
Use Case
What problems can you solve with the Semonto website audit?
“Let’s improve the website.” It’s a demand you might get from your clients or your superiors. But how do you get started? The most efficient way to improve the health of your website is by first performing a website audit.
Jelle De Laender - 5 March 2025
Tips and Tricks
How to monitor your Let’s Encrypt certificates
On June 4, 2025, Let's Encrypt will stop sending emails when a certificate is about to expire. Here's what you should know about it and what you can do to stay on top of your website.
Jelle De Laender - 23 January 2025
Use Case
How Semonto helps you meet website accessibility guidelines (EAA)
The EAA Accessibility Act is a European directive that will come into force in June 2025. By then, European websites must be accessible to everyone, including people with disabilities. Find out how you can check and improve your website now to avoid penalties later.
Jelle De Laender - 28 November 2024
Tips and Tricks
4 ways to reduce notifications when monitoring your website
If you receive too many notifications, you will start to ignore them. Here are 4 strategies to help you receive fewer—but better—notifications when monitoring your website.
Jelle De Laender - 31 October 2024
New
Stop manually testing your website's Lighthouse Score - do this instead
Are you still performing Lighthouse checks manually? Then, you will be happy to know that Semonto can now take this task off your hands. Introducing: Lighthouse monitoring.
Jelle De Laender - 3 October 2024
Use Case
Why every agency should offer a website performance report
Every web developer and digital agency can benefit from performing website audits and offering performance reports. But when and how should you use them? Here’s the answer in a nutshell.
Jelle De Laender - 19 September 2024
New
How to keep Craft CMS websites healthy with the Semonto Plugin
We are proud to announce that today, we released our plugin for CraftCMS.
Jelle De Laender - 1 August 2024
New
WordPress plugin: Monitor disks and more
We recently released our server health monitoring plugin for WordPress. We added new tests to monitor more health aspects of your web server.
Jelle De Laender - 30 July 2024
Tips and Tricks
The ultimate guide to 404 pages
This article contains everything you ever wanted to know about 404 pages: what the 404 error means, how to improve your 404 page, and how to avoid 404 errors on your website.
Jelle De Laender - 16 July 2024
Tips and Tricks
How to prevent 404 errors on your website
It’s not enough to improve your 404 page. Real website professionals care the most about preventing these 404 errors on your website altogether. In this article, we show you how to do just that.
Jelle De Laender - 15 July 2024
Tips and Tricks
Improve your 404 page: 6 things you can do right now
Website visitors will bump into a 404 page when the page they are trying to access does not exist. That’s not a pleasant experience. Discover 6 ways to turn this frustration around with useful and clever ways to improve your 404 page.
Jelle De Laender - 12 July 2024
Tips and Tricks
A 404 error: what is it, and why is it called that way?
Have you ever wondered what the numbers in a 404 error message mean? In this article, we explain in plain language what a 404 error is and what it tells you about the status of the website you are trying to visit.
Jelle De Laender - 11 July 2024
New
View IP addresses of monitored websites in Semonto
Semonto now shows you the IP address of your server in the test results. This allows you to quickly identify which server is in trouble.
Jelle De Laender - 27 June 2024
New
How to control the crawling speed when checking for broken links
In some cases, you may want to decrease the crawling speed of your website monitor. In Semonto, you can now adjust this setting.
Jelle De Laender - 6 June 2024
New
Our WordPress plugin is live!
As of today, you can install the Semonto plugin to monitor your WordPress website and configure server health tests from within the WordPress dashboard.
Jelle De Laender - 2 May 2024
New
Bye bye PulseChecks, Hello Cron job monitoring
Do you know our Pulsecheck feature?
Jelle De Laender - 23 April 2024
New
How to get alerted when your domain is about to expire
We have recently released a new feature in Semonto: domain monitoring. In this article, we explain what domain monitoring is, why you need it and how it works. Let’s dive in!
Jelle De Laender - 21 March 2024
New
We changed our pricing. Here’s what’s new.
No, this is not another announcement by a SaaS tool to announce a pricing increase. In fact, most customers will notice a slight price reduction. Find out why we changed our pricing and what it means for your subscription.
Jelle De Laender - 12 February 2024
Use Case
PandaPanda: “Our products are built to last. With Semonto, we can prove it.”
These days, creating beautiful websites and apps is not enough. You also have to keep them up and running. We asked digital agency PandaPanda how they use monitoring to make sure that their products stand the test of time.
Jelle De Laender - 17 January 2024
New
RSS Feeds of Semonto
Still into RSS Feeds? We added RSS Feeds at Semonto.
Jelle De Laender - 15 January 2024
Life at Semonto
Semonto's 2023 wrap-up
In the last week of 2023, we love to take a moment to look back at everything that happened this year.
Jelle De Laender - 29 December 2023
New
How to proactively monitor the health of your server
We've just added Server Health Monitoring as a standalone feature in Semonto! In short: it is now easier than ever to test your server's health independently of your website monitoring.
Jelle De Laender - 3 October 2023
New
Get notified of all SSL certificate changes
We don’t need to tell you how important it is for your website health to have a valid SSL certificate. That is why, by default, Semonto lets you know when a certificate is in trouble or about to expire. But today, we are taking it one step further.
Jelle De Laender - 13 July 2023
Use Case
Semonto use case: GPS tracker Mindme locates people in need
What would you do if you needed help and no one was around? That question led to the creation of Mindme - a UK-based company producing wearable personal alarm devices that allow users to get help quickly when they are alone. In this interview, co-owner Simon Wolf explains why he uses Semonto.
Jelle De Laender - 17 May 2023
Use Case
Should I use Google Search Console to find broken links on my website?
Can you use Google Search Console to find broken links on your website? Yes and no. In this article, we explain why Google Search Console is not sufficient to keep your website free from broken links and what you should do instead.
Jelle De Laender - 22 March 2023
Tips and Tricks
How to create an escalation process in Semonto
Did you know that Semonto can help you to automate your incident escalation? In this article, we show you how.
Jelle De Laender - 23 January 2023
Life at Semonto
Semonto's 2022 wrap-up
Time flies, it’s already 2023. Time to look back at 2022 and all the things that happened at Semonto.
Jelle De Laender - 02 January 2023
New
How to set allowed downtime thresholds when monitoring a website
In Semonto, you can define how long an issue is allowed to persist before you want to be alerted. You can also create an escalation system, so that different people get notified depending on the duration of the issue.
Jelle De Laender - 23 December 2022
Tips and Tricks
What is web hosting, and why should I care?
What is hosting? Who is responsible for your hosting? And how can you measure the quality? In this article, we answer all hosting-related questions.
Jelle De Laender - 20 October 2022
New
How to track your website’s broken links over time
We have added a chart that shows you the evolution of the number of broken links on your website in the last 30 days.
Jelle De Laender - 14 October 2022
Tips and Tricks
HTTPS and TLS/SSL Monitoring Explained
Attracting new clients is more important than ever. So companies invest more in sales, SEO and marketing. But what if the visitors you attract leave your website immediately? Find out what you should be checking instead.
Jelle De Laender - 19 August 2022
New
How to create a website audit report
What if you could perform a website audit and receive the performance results in a PDF report? In this article, we'll show you how it's done.
Jelle De Laender - 17 June 2022
Tips and Tricks
Why you should care about your website’s uptime
Your uptime percentage indicates how long your website was available without any interruption. Find out in this article why you should care.
Jelle De Laender - modified 5 May 2022
New
How to receive website monitoring alerts in a Slack channel
As of today, you can receive Semonto notifications straight in your favourite Slack channel.
Jelle De Laender - 9 March 2022
New
New Search Bar: Find Anything Within Semonto
We have added a search function to the top navigation. This way, you can find anything in Semonto, from a URL to a phone number. Give it a try!
Jelle De Laender - 29 December 2021
New
Using default notification settings when monitoring a website or server
In Semonto, you can now choose how you want to be alerted of detected issues, and then reuse those settings by marking them as default.
Jelle De Laender - 20 December 2021
Use Case
Monitoring MijnLijn API and servers
Semonto is great for monitoring websites and webshops' availability and reachability and for locating mixed content and broken links. But Semonto can also be used to deeply monitor custom web applications like MijnLijn.
Jelle De Laender - 7 April 2021
New
How to get a voicemail message when your website is down
We have added a new alert option to Semonto. You can now get notified by voice message whenever something is wrong with your website or server.
Jelle De Laender - 2 November 2020
New
Looking for a website monitoring app for Android?
Good news for Android users! Our Semonto uptime notification app is now available in Google Play for you to download.
Jelle De Laender - 19 October 2020
Tips and Tricks
We will watch your website for free while you are fighting the corona crisis
We want to support other companies that are affected by the coronacrisis by offering Semonto for free for 4 months. Together we are stronger.
Jelle De Laender - 24 March 2020
Tips and Tricks
What to do if your website is down
Is your website down? There are some things you can do to figure out what is going on. In this blog, we will take you through the process step by step.
Jelle De Laender - 10 December 2019
Tips and Tricks
The World Wide Web is 30 years old
The World Wide Web is 30 years old today and has become indispensable by most people.
Jelle De Laender - 12 March 2019
Tips and Tricks
9 ways to prepare your website for Black Friday and Cyber Monday
Can your website handle the Black Friday and Cyber Monday madness? With this checklist, your website is ready for a possible peak in traffic.
Jelle De Laender - modified 11 November 2022
Use Case
5 Reasons Web Developers Use Semonto to Find Broken Links
Semonto started out as an uptime monitoring tool. But, at the request of the web developers in our community, we recently added broken link monitoring to our features. Find out why this matters to web developers and why Semonto is better than other broken link checkers out there.
Jelle De Laender - 14 October 2021
Use Case
3 Monitoring Hacks for Website developers
We asked Ivo, a web developer who frequently uses Semonto, to explain how he monitors the websites he builds for his clients and whether he can share some helpful monitoring hacks for other website developers like himself.
Jelle De Laender - 19 May 2021
Tips and Tricks
4 Free Tools to Check The Health of Your Website
Every website will run pretty smoothly for the first year or so. But just like a car, it will start to fall apart over time if you do not give it a regular check-up. At Coding Mammoth, we have created 4 free tools to check the health of your website. In the following sections, we will explain what these checks are, why they are important and how you can use them for free.
Jelle De Laender - 19 April 2021
Life at Semonto
Semonto's 2020 wrap-up
2020 was a weird and unique year for everyone, for sure. The COVID-19 pandemic affected everyone in one way or another, including us. Luckily, at Coding Mammoth, the company behind Semonto, we were already working fully remotely and distributed, and our sector was not that affected. Still, we felt the impact of the COVID-19 pandemic.
Jelle De Laender - 21 December 2020
New
New: Improved Subscription Model
As you might have noticed, we are continually working on Semonto to give you the best possible experience. Today, we are proud to announce our latest improvement: our new subscription model.
Jelle De Laender - 10 November 2020
Tips and Tricks
How to monitor a server that is not publicly accessible
Monitoring a server that is not publicly accessible? Easy! Instead of calling your server, your server pings us. In this article, we explain exactly how that works
Jelle De Laender - 25 August 2020
New
HTTPS, SSL & TLS Monitoring
Securing your website via HTTPS is a must. It increases the security and trust level for your customers and website visitors. But because HTTPS uses SSL certificates, your website becomes more sensitive to configuration errors that can bring your entire site down. With Semonto HTTPS monitoring, you will never miss an expired or revoked certificate or a broken SSL chain again.
Jelle De Laender - 23 June 2020
Tips and Tricks
Does your website need HTTPS?
What is HTTPS and why is it important? A lot of people think that HTTPS only adds value if your website is a bank tool or if it contains sensitive data. Don't be fooled. HTTPS should be enabled on all websites. That means that you need it, too. Why? Read all about it in this article.
Jelle De Laender - 31 March 2020
Tips and Tricks
Wij waken gratis over je website tot de coronacrisis voorbij is
Om ondernemingen die getroffen zijn door de coronacrisis te ondersteunen bieden we Semonto gratis 4 maanden aan. We houden de webshop nauwlettend in de gaten en verwittigen bij de eerste problemen, zodat de ondernemer zich kan focussen op zijn bedrijf.
Jelle De Laender - 24 March 2020
Life at Semonto
Digital Marketer & Copywriter Wanted
Are you a native Dutch speaking freelancer, your English is fluent and you have an affinity with ICT? You might be the Copywriter/Digital Marketeer we are looking for to apply your expertise for our Semonto service.
Jelle De Laender - 13 September 2019
Tips and Tricks
12★apps Christmas Special
Semonto takes part in the 12★apps Christmas Special.
Jelle De Laender - 26 December 2018
Tips and Tricks
Black Friday / Cyber Monday!
Black Friday / Cyber Monday! 20% discount on Semonto.com until 29 November 2018!
Jelle De Laender - 22 November 2018