When was LetsDefend founded?

LetsDefend was founded in 2020.

Where is LetsDefend located?

LetsDefend is headquartered in Sterling, United States.

How many employees does LetsDefend have?

As of Aug 31, 2026, the latest employee count at LetsDefend is 163.

Where does LetsDefend rank among its competitors?

LetsDefend ranks 2nd amongst 27 active competitors, only 1 of which is funded. Immersive Labs, which secured $66M in Oct, 2022.

Who are the top competitors of LetsDefend?

LetsDefend's top competitors include Immersive Labs, Bugthrive and Defend the Web. Among them, Immersive Labs secured the most recent funding round in October, 2022.

LetsDefend - 2026 Company Profile, Team & Competitors

LetsDefend is an acquired company based in Sterling (United States), founded in 2020 by Hasan E, Umut Tosun, Osman Cihat Isik and Omer Gunal. It operates as a Practical training for security analysts. The company has 27 active competitors, including 1 funded and 1 that has exited. Its top competitors include companies like Immersive Labs, Bugthrive and Defend the Web.

Company Details

Practical training for security analysts. It provides a cyber security platform that provides practical training for blue team members for assisting them in defending the simulated company from cyber attacks, It also provides solutions such as cyber attacks monitoring, incident response and investigation.

Website: letsdefend.io
Social
Email ID: *****@letsdefend.io
Phone Number: +1 **********

Key Metrics

Founded Year

2020

Location

Sterling, United States

Stage

Acquired

Ranked

2^nd among 27 active competitors

Employee Count

163 as on Aug 31, 2026

Similar Companies

Immersive Labs & 25 more

Exit Details

Acquired by Hack The Box (Sep 16, 2025)

View LetsDefend's full profile

LetsDefend got acquired by Hack The Box on Sep 16, 2025.

Click here to take a look at LetsDefend's acquisition in detail

LetsDefend has not raised any funding rounds yet.

The founders of LetsDefend are Hasan E, Umut Tosun, Osman Cihat Isik and Omer Gunal.

Here are the details of LetsDefend's key team members:

Hasan E: Co-Founder of LetsDefend.
Umut Tosun: Co-Founder of LetsDefend.
Contact Info: 1 email address
Osman Cihat Isik: Co-Founder of LetsDefend.
Contact Info: 1 email address
Omer Gunal: Co-Founder of LetsDefend.
Contact Info: 1 email address

View details of LetsDefend's Founder profiles and Board Members

LetsDefend's employee count trend

LetsDefend has 163 employees as of Aug 26. Here is LetsDefend's employee count trend over the years:

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Top competitors of LetsDefend include Immersive Labs, Bugthrive and Defend the Web. Here is the list of Top 10 competitors of LetsDefend, ranked by Tracxn score:

Rank	Company Details	Short Description	Total Funding	Investors	Tracxn Score
1st	Immersive Labs 2017, Bristol (United Kingdom), Series C	Provider of cybersecurity training platforms for technical skill development exercises	$189M	Goldman Sachs, Summit Partners & 36 others	66/100
2nd	LetsDefend 2020, Sterling (United States), Acquired	Practical training for security analysts	-	-	46/100
3rd	Bugthrive 2025, India, Unfunded	Provider of cybersecurity training modules for ethical hacking practice scenarios	-	-	27/100
4th	Defend the Web 2019, United Kingdom, Unfunded	Cybersecurity challenges and learning solutions provider	-	-	24/100
5th	CYBERWAVE 2024, France, Unfunded	Provider of offensive security assessments and cybersecurity skills training platform	-	-	24/100
6th	CanYouHack 2026, Unfunded	Provider of platforms for hosting cybersecurity challenges and training exercises	-	-	22/100
7th	The Cyber Security Speakers Agency 2023, London (United Kingdom), Unfunded	Platform offering wide range of cybersecurity speakers for events and conferences	-	-	22/100
8th	AI Security 2025, London (United Kingdom), Unfunded	Provider of hands-on training platforms for securing artificial intelligence systems	-	-	20/100
9th	Kernel 2026, Unfunded	Developer of platforms for validating cybersecurity skills through measurable execution	-	-	18/100
10th	Secure Coding Hub 2025, Newark (United States), Unfunded	Provider of interactive developer training for secure software coding practices	-	-	17/100