Serlo.org Serlo – Die freie Lernplattform

Serlo.org Overview

Serlo is a non-profit free educational website that provides learning materials in German and English languages. It aims to enhance individual learning and promotes the distribution of knowledge using a free open-source platform. The website caters to students, teachers, and life-long learners alike.

Serlo.org's homepage is clean with a simple design and high usability. The primary navigation menu divides the website into the following categories: Math, Science, Languages, Humanities, and more. Upon clicking the category, there is a drop-down menu that shows a clear organization of the site's content. Additionally, there is a search bar for users to directly search for learning materials.

The homepage also features an explanatory video that briefly introduces Serlo's mission and values. Below the video, several banners show the latest learning materials added to the website, along with additional links to resources focused for elementary and middle-school students.

Furthermore, the website contains a blog where educational and industry leaders share their ideas and insights on various topics. The blog is neatly categorized under Business, EdTech, Policy, Research & Development, and Teacher & Students.

Apart from the blog, the website has a community forum as a platform for users to ask questions, engage with other learners, and contribute to the development of the educational content. The forum is moderated to ensure quality and friendly interactions among users, ensuring Serlo is a family-friendly website.

Regarding the website's performance, the loading speed is moderate, with a PageSpeed Insights score of 54, which can potentially be improved. Nevertheless, it is still considered an acceptable score.

In conclusion, Serlo.org is an excellent educational resource for students, teachers, and lifelong learners. The website's design, navigation, and functionalities are user-friendly to provide an exceptional learning experience. Its various categories and resources are versatile, catering to different learners' needs and align with its mission to promote the distribution of knowledge freely.

Serlo.org Rank Summary

Global Rank

59,025

Average Load Time

1.96sec

Links In Count

Website Value

$201,681

Audience Geography. Where are serlo.org visitors located?

Country	Visitors
Germany DE	85.4%
Austria AT	6.3%
Switzerland CH	5.1%
Other	3.2%

Country	Pageviews
Germany DE	87.1%
Austria AT	6.3%
Switzerland CH	4.5%
Other	2.2%

Country	Rank
Germany DE	2378
Austria AT	4458
Switzerland CH	5307

Where do visitors go on serlo.org?

Subdomain	Pageviews
de.serlo.org	99.74%
other	0.26%

Subdomain	Pageviews per User
de.serlo.org	1.6

Subdomain	Reach
de.serlo.org	99.8%

How popular is serlo.org?

Period	Global Rank	Global Rank Delta
past 3 months	59025	-43259
past month	52843	-6977
past week	50145	-7072
yesterday	55093	4086

Days	Pageviews Rank	Pageviews Rank Delta	Pageviews per Million	Pageviews per Million Delta	Pageviews per User	Pageviews per User Delta
90	89404	-58102	63	93%	1.6	-1.25%
30	81958	-10240	71	20%	1.6	1%
7	73622	-22958	81	40%	1.8	30%
1	88122	14095	69	-19.34%	2	-22.5%

Days	Reach Rank	Reach Rank Delta	Reach per Million	Reach per Million Delta
90	51170	-38379	148	95%
30	45474	-6046	17	20%
7	45161	-2115	17	5%
1	47251	-546	18	4%

Serlo.org Website Safety

Overview

Last Updated: 09/18/2024

Overall result - serlo.org is safe.

We gather website safety and reputation data and compare it with available third-party sources so we calculate own safety and trustworthiness rate based on information that we get.

Norton Connect Safe

Last Updated: 03/24/2024

serlo.org is safe.

Norton ConnectSafe evaluates serlo.org for any unsafe and insecure content. The results are critical for families with young children.

Google Safe Search

Last Updated: 02/22/2019

serlo.org is safe.

SafeSearch is used as a parental control tool to filter out any inappropriate for your children search results on your devices: phones, tablets or personal computers.

Google Safe Browsing

Last Updated: 01/09/2019

serlo.org is safe.
Malware: not found.
Phishing: not detected.
Unwanted software: not found.
Harmfull applications: not found.

Google Safe Browsing notifies when websites are compromised by malicious actors. These protections work across Google products and provide a safer online experience.

Site Advisor

Last Updated: 02/24/2021

serlo.org is safe.

McAfee assesses serlo.org for a meaningful set of security threats. Featured dangers from annoying pop-ups to hidden Trojans, that can steal your identity, will be revealed. McAfee does not analyze serlo.org for mature or inappropriate content, only security checks are evaluated.

Web of Trust

Last Updated: 01/10/2019

serlo.org child safety is very good.

The WOT calculates reputation of the serlo.org. This reputation system receives ratings from users and information from third-party sources, assesses the serlo.org for safety features and confirms, whether serlo.org is suitable for children.

SSL Information

SSL Checker Tool

Domain	ssl389400.cloudflaressl.com
Issuer Organization	COMODO CA Limited
Issuer	COMODO ECC Domain Validation Secure Server CA 2
Algorithm	ecdsa-with-SHA256
Valid form	11/04/2019
Expiration	05/12/2020
Signed	Certificate is not self signed
Additional Domains	ssl389400.cloudflaressl.com .chargepanel.com .creativemusthaves.nl .dyfliving.nl .feetofftheground.nl .nocashstickers.com .plukweide.nl .pockazy.nl .repayal.com .serlo.org .tapasclub.eu .vegansweetsamsterdam.nl .vlasgraankoffie.nl .winkelvanpapier.nl .woodandwork.nl *.yvonnehakkert.nl chargepanel.com creativemusthaves.nl dyfliving.nl feetofftheground.nl nocashstickers.com plukweide.nl pockazy.nl repayal.com serlo.org tapasclub.eu vegansweetsamsterdam.nl vlasgraankoffie.nl winkelvanpapier.nl woodandwork.nl yvonnehakkert.nl

Serlo.org Rank History

Alexa Rank shows how popular serlo.org is in comparison with other sites. The most popular site has Alexa Rank equals 1. If serlo.org has Alexa Rank equals 100,000, then it is in TOP 100,000 popular sites in the world. The rank is calculated using a combination of average daily visitors to serlo.org and pageviews on serlo.org over the past 3 months.

Serlo.org Hosting Information

Server Location

Geolocation Tool

ASN Information

ASN Lookup Tool

ASN ID: 13335

ASN Title: CLOUDFLARENET - Cloudflare, Inc., US

Last Update: 07/29/2024

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

ASNumber: 13335
ASName: CLOUDFLARENET
ASHandle: AS13335
RegDate: 2010-07-14
Updated: 2017-02-17
Comment: All Cloudflare abuse reporting can be done via https://www.cloudflare.com/abuse
Ref: https://rdap.arin.net/registry/autnum/13335

OrgName: Cloudflare, Inc.
OrgId: CLOUD14
Address: 101 Townsend Street
City: San Francisco
StateProv: CA
PostalCode: 94107
Country: US
RegDate: 2010-07-09
Updated: 2017-02-17
Comment: All Cloudflare abuse reporting can be done via https://www.cloudflare.com/abuse
Ref: https://rdap.arin.net/registry/entity/CLOUD14

OrgTechHandle: ADMIN2521-ARIN
OrgTechName: Admin
OrgTechPhone: +1-650-319-8930
OrgTechEmail: rir@cloudflare.com
OrgTechRef: https://rdap.arin.net/registry/entity/ADMIN2521-ARIN

OrgAbuseHandle: ABUSE2916-ARIN
OrgAbuseName: Abuse
OrgAbusePhone: +1-650-319-8930
OrgAbuseEmail: abuse@cloudflare.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/ABUSE2916-ARIN

OrgNOCHandle: NOC11962-ARIN
OrgNOCName: NOC
OrgNOCPhone: +1-650-319-8930
OrgNOCEmail: noc@cloudflare.com
OrgNOCRef: https://rdap.arin.net/registry/entity/NOC11962-ARIN

RNOCHandle: NOC11962-ARIN
RNOCName: NOC
RNOCPhone: +1-650-319-8930
RNOCEmail: noc@cloudflare.com
RNOCRef: https://rdap.arin.net/registry/entity/NOC11962-ARIN

RTechHandle: ADMIN2521-ARIN
RTechName: Admin
RTechPhone: +1-650-319-8930
RTechEmail: rir@cloudflare.com
RTechRef: https://rdap.arin.net/registry/entity/ADMIN2521-ARIN

RAbuseHandle: ABUSE2916-ARIN
RAbuseName: Abuse
RAbusePhone: +1-650-319-8930
RAbuseEmail: abuse@cloudflare.com
RAbuseRef: https://rdap.arin.net/registry/entity/ABUSE2916-ARIN

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

Serlo.org Domain Registration and Settings

WHOIS

WHOIS Lookup Tool

Domain Name: SERLO.ORG
Registry Domain ID: D88493893-LROR
Registrar WHOIS Server: whois.ovh.com
Registrar URL: http://www.ovh.com
Updated Date: 2019-05-26T09:48:14Z
Creation Date: 2002-07-17T20:45:08Z
Registry Expiry Date: 2026-07-17T20:45:08Z
Registrar Registration Expiration Date:
Registrar: OVH
Registrar IANA ID: 433
Registrar Abuse Contact Email: abuse@ovh.net
Registrar Abuse Contact Phone: +33.972101007
Reseller:
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Registrant Organization: Serlo e.V.
Registrant State/Province:
Registrant Country: DE
Name Server: KARA.NS.CLOUDFLARE.COM
Name Server: NORM.NS.CLOUDFLARE.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form https://www.icann.org/wicf/)
>>> Last update of WHOIS database: 2021-05-22T09:33:14Z

DNS Records

DNS Lookup Tool

Host	A Record	TTL

Host	MX Record	Priority	TTL

Host	NS Record	TTL

Host	TXT Record	TTL

Serlo.org HTML Check

HTML Validation Tool

Warnings

The “navigation” role is unnecessary for element “nav”.

Empty heading.

The first occurrence of ID “Layer_1” was here.

Errors

Duplicate attribute “class”.

Heading cannot be a child of another heading.

End tag “div” seen, but there were open elements.

Unclosed element “h2”.

An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

Stray doctype.

Duplicate ID “Layer_1”.

Bad value “” for attribute “aria-labelledby” on element “div”: An IDREFS value must contain at least one non-whitespace character.

The “aria-labelledby” attribute must point to an element in the same document.

Serlo.org Desktop Performance

Last tested: 11/12/2018

Desktop Speed

74%

Eliminate render-blocking JavaScript and CSS in above-the-fold content

Enable compression

Leverage browser caching

Minify JavaScript

Desktop Resource Breakdown

Total Resources	37
Number of Hosts	14
Static Resources	27
JavaScript Resources	15
CSS Resources	2

Serlo.org Mobile Insights

Last tested: 11/12/2018

Mobile Usability

96%

Size tap targets appropriately

Mobile Speed

54%

Eliminate render-blocking JavaScript and CSS in above-the-fold content

Leverage browser caching

Enable compression

Minify JavaScript

Mobile Resource Breakdown

Total Resources	36
Number of Hosts	14
Static Resources	26
JavaScript Resources	15
CSS Resources	2

Serlo.org Common Typos

www.serlo.com
www.serlo.net
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www.serlop.org

Serlo.org Serlo – Die freie Lernplattform

Serlo.org Overview

Serlo.org Rank Summary

Serlo.org Website Safety

Serlo.org Rank History

Serlo.org Hosting Information

Serlo.org Domain Registration and Settings

Serlo.org HTML Check

Serlo.org Desktop Performance

Serlo.org Mobile Insights

Serlo.org Similar Audits

Serlo.org Common Typos