Reputation trusted by more than 1.4 million companies.
I want that too

corma GmbH

Corporate Investigations, Ermittlungen, OSINT-Trainings, Maltego-Trainings

corma GmbH
4.90 out of 5
Excellent
41 Reviews
Authenticity of reviews
Submit a review
Get in touch
Contact information
Professional OSINT Investigations since 1999
Corma GmbH conducts forensic online investigations for corporations and government agencies. Founded in 1999 by Jörn Weber, who previously spent nearly 20 years as Criminal Chief Inspector.
What we do:...
View full description

Contact information

corma GmbH
Hammer Str. 19
40219 Düsseldorf
Germany
Directions

Contact person
Jörn Weber

Images, Videos & Audio

Opening hours

Websites

Social Media

100% Recommended
5 stars 32
3 stars 0
2 stars 0
1 star 0
Quality
Value
Services
Realization
Consulting
Customer service
Excellent (4.92)
Cost-performance ratio
Excellent (4.75)
Top competencies

Customer loyalty

5.00 out of 5
11 Reviews

Customer satisfaction

5.00 out of 5
11 Reviews

Project success

5.00 out of 5
11 Reviews

36 Reviews on ProvenExpert.com

4.89 out of 5
Excellent
5.00 out of 5
Excellent
Recommendation
We are extremely satisfied with the outstanding support provided by Corma GmbH. Their full-service approach—from creating insightful clusters to uncover connections between entities, to conducting large-scale offline investigations including 24/7 surveillance—has been invaluable to our enforcement work.
Jörn Weber’s deep expertise has been particularly helpful in crafting well-founded criminal complaints, and the investigation reports delivered by the team are both thorough and professionally designed.
Corma has proven to be a reliable, knowledgeable, and solution-oriented partner. We truly appreciate their dedication and look forward to continued collaboration.
Customer review & rating for:
corma GmbH
09/03/2025Juliana F.
5.00 out of 5
Excellent
Recommendation
Very nice and helpful contact. The online training courses are very good and the content is very good. I can only recommend corma GmbH.
Show original
Customer review & rating for:
corma.training "Online Video Training"
08/02/2024Armin B.
5.00 out of 5
Excellent
Recommendation
Jörn Weber offers well-founded and well-prepared knowledge in the field of Internet Investigations. From my point of view, a clear recommendation if you want to get better in the collection area of OSINT.
Show original
Customer review & rating for:
corma.training "Online Video Training"
09/26/2023Ole D.
5.00 out of 5
Excellent
Recommendation
Very good and understandable courses (I have booked all available courses in 2023). The instructor shows the different techniques and procedures in a practical way and is always available for a personal exchange. Questions are answered very quickly. Everything TOP!!!
Show original
Customer review & rating for:
corma.training "Online Video Training"
08/28/2023A.
corma GmbH Comment from corma GmbH:
Thanks for this great review! Updates on the courses are already in the "pipeline".
5.00 out of 5
Excellent
Recommendation
Mr. Weber is very experienced in the field of OSINT and passes on the knowledge in his courses in a way that is easy to understand. If you have any questions, Mr. Weber is always available to help. The online meetings are very valuable and are adapted to the individual learning situation. Mr. Weber is helping me set up the Kindersuche.net project to find missing children through public sources.
Show original
Customer review & rating for:
corma.training "Online Video Training"
08/09/2023Daniel T.
corma GmbH Comment from corma GmbH:
Thank you very much for your positive evaluation! I am already looking forward to our further individual trainings as part of the overall package.
5.00 out of 5
Excellent
Recommendation
I am a working OSINT analyst, I would strongly recommend the corma GmbH courses, specifically the Maltego training courses. Jörn is a Maltego SME, no doubt about that. Thanks for the awesome training provided. [Name Redacted], France.
Customer review & rating for:
corma.training "Online Video Training"
02/06/2023Anonymously
5.00 out of 5
Excellent
Recommendation
Corma delivered a program that exactly matched the outcomes we asked for. The teaching was informative, discursive and flexible to the individuals too. Excellent. Thank you.
Show original
Customer review & rating for:
corma.training "Online Video Training"
02/06/2023Anonymously
5.00 out of 5
Excellent
Recommendation
Excellent services provided by an experienced and competent team of experts.
Show original
Customer review & rating for:
corma GmbH
01/23/2023K.
corma GmbH Comment from corma GmbH:
Thank you for your very kind review!
We look forward to continuing to support your corporate security team.
5.00 out of 5
Excellent
Recommendation
Very professional service, super responsive, has opened my eyes to what everything on the Internet is buzzing around about you without you having the slightest idea. I can only recommend!
Show original
Customer review & rating for:
corma GmbH
01/20/2023Anonymously
5.00 out of 5
Excellent
Recommendation
Reliability, high trust, dependability, very good cooperation
Show original
Customer review & rating for:
corma GmbH
01/19/2023Anonymously
corma GmbH Comment from corma GmbH:
Thank you for your positive feedback on our service. We are pleased that you enjoyed our services and look forward to supporting you in the future.
5.00 out of 5
Excellent
Recommendation
The professional advice and wealth of experience is second to none. I can't think of anything I could find fault with. I came with little knowledge and a new world was opened to me. Everything builds structurally on each other and you can see that a lot of time was invested in all systems.
Show original
Customer review & rating for:
corma GmbH
01/10/2023D.
corma GmbH Comment from corma GmbH:
Thank you very much for the great evaluation.
This is a very good motivation for us to expand the trainings on internet investigations even further.
Never wonder, always know :-)
5.00 out of 5
Excellent
Recommendation
Mr. Weber offers individual advice and competently addresses very specific questions. Thank you very much and best regards from Switzerland.
Show original
Customer review & rating for:
corma.training "Online Video Training"
01/10/2023W.
corma GmbH Comment from corma GmbH:
Thank you for your review of the Internet Investigations & OSINT Basic Training course! I am already looking forward to our upcoming individual trainings as a supplement to the online courses.
And many greetings to Switzerland.
3.75 out of 5
Good
Recommendation
some videos missing in the course, still in progress
Customer review & rating for:
corma.training "Online Video Training"
01/06/2022Anonymously
corma GmbH Comment from corma GmbH:
Thank you for your feedback. You have access to the course for 12 months and within this time you will see the lasted updated and final new videos. The videos which are currently in production are clearly marked as "in production" on the sales page, so I believe you don't miss a video from this point of view.
Again, thanks for your feedback and enjoy the course!
5.00 out of 5
Excellent
Recommendation
Thank you again for this course. I have found that it does not hurt after some time to make a second run. Everything you don't use often is quickly forgotten. I especially liked the opportunity to continue using the course until the end of the year. It is a pity that in the bonus videos, Social Net could not be introduced yet. I have been using Sozial Links Pro for some time, and I would have been interested to know if it was possible to do without Sozial Links when using Sozial Net. I thank Mr. Weber for the good explanations. I have of course recommended the course to others, and it has already been attended by some of my colleagues.
Show original
Customer review & rating for:
corma.training "Online Video Training"
08/14/2021Anonymously
5.00 out of 5
Excellent
Recommendation
From the initial contact to the conclusion of the matter, corma GmbH worked very professionally and adeptly. Thanks to the highly specialized team, the matter was brought to a positive conclusion quickly. Many thanks for the outstanding work.
Show original
Customer review & rating for:
corma GmbH
05/29/2021Anonymously
5.00 out of 5
Excellent
Recommendation
I liked the method of practical teaching and having tasks during training related to different topics.
Customer review & rating for:
corma.training "Online Video Training"
04/30/2021T.
4.80 out of 5
Excellent
Recommendation
We needed expert analysis of PDF documents and other related material. We received very personalized attention to our requirements and the professionals at corma worked diligently with us to achieve the sought outcome. We highly recommend their expertise and personalized service.
Customer review & rating for:
corma GmbH
03/02/2021A.
corma GmbH Comment from corma GmbH:
Thank you very much for your feedback!
4.98 out of 5
Excellent
Recommendation
Corma are very experienced, professional and competent -the personal service provided is outstanding. It is a pleasure to work with them and the outcomes have always been good.
Show original
Customer review & rating for:
corma GmbH
02/23/2021Anonymously
corma GmbH Comment from corma GmbH:
Thank you for your order and the trust you have placed in us. We are looking forward to new challenges from you.
And thank you for the great review!
5.00 out of 5
Excellent
Recommendation
We have been commissioning corma GmbH for over 10 years. Confidentiality has always been maintained, the technical competence is convincing and the cooperation works perfectly at all times.
corma GmbH regularly provides us with highly specialized data evaluations that can only be generated with the help of profound professional knowledge and technical expertise. In addition, we use corma for ad-hoc orders, which are always handled with great sensitivity. We highly appreciate the professionalism of this service and can recommend corma as a trustworthy partner.
Show original
Customer review & rating for:
corma GmbH
02/22/2021Anonymously
corma GmbH Comment from corma GmbH:
Thank you so much for this great review!
5.00 out of 5
Excellent
Recommendation
Fast and competent realization, complete documentation, pleasant contact
Show original
Customer review & rating for:
corma GmbH
02/08/2021Anonymously
corma GmbH Comment from corma GmbH:
Thank you for your trust and this review.
5 Reviews from
1 other source
5.00 out of 5
Excellent
5.00 out of 5
Excellent
5 reviews on Google Maps
 
12/11/2021
Submit a review

Your message to corma GmbH

Please complete the field highlighted in red.
Please complete the field highlighted in red.
Invalid email address
* required fields
Invalid characters. Only numbers and space characters are possible.
Send message

I accept the privacy policy.

All reviews and experiences about corma GmbH are the subjective opinions of those who compose and submit them  |  The profile owner is responsible for the contents of this page  |   Profile active since 05/20/2020  |  Last update: 11/23/2025   |  Report profile

More transparency and security while looking for competent professionals

Authentic customer opinions
Take advantage of other customers' experiences: ProvenExpert's authenticated customer reviews can help you choose the right product or service.
Effective customer feedback
ProvenExpert allows the entire service spectrum of a company (e.g. customer service, consulting) to be reviewed. This way you get a detailed overview of your service quality in all areas.
Independent reviews
ProvenExpert is free, independent, and neutral. Customers make reviews of their own accord — their opinions are not for sale. And the content of reviews cannot be influenced by money or by any other means.

A good reputation is the world's
best form of advertising!

85% of all consumers trust online reviews just as much as they do personal recommendations.

Let ProvenExpert give your business a boost with the best advertising in the world: the opinions of satisfied customers.
Join now for free!
Review Guidelines  |  Quality Assurance  |  Privacy Policy  |  Legal Notice  © 2011 - 2025 Expert Systems GmbH