Free hands-on security training: lock picking, RFID, Hak5, Flipper Zero and IoT hardware courses, plus a non-exclusive marketplace where instructors keep 75 to 90% of sales.
A startup from London, the United Kingdom, founded by Kai Castledine.
This page is designed to help you find out whether OnlySecurity is good and if it is the right choice for you.
OnlySecurity is a practical security training platform built around four things: compete, train, learn and share.
For learners - Take hands-on courses in offensive, defensive and physical security, taught by working practitioners and by the companies that make the hardware. Topics include lock picking and covert entry, RFID and access control with the Proxmark, Flipper Zero and its add-ons, Hak5 tools such as the WiFi Pineapple and Shark Jack, IoT radio (LoRa, BLE, Zigbee, Sub-GHz), magstripe and EMV. Follow a learning path for the role you want, earn a badge for each course you finish, collect points on the leaderboard and build a portfolio recruiters can verify. Joining is free.
For trainers. - Join, teach, mark and earn. Publish your course on a non-exclusive licence: you keep ownership, you can sell it elsewhere and you can withdraw it at any time. Trainers keep 75% to 90% of net sales depending on plan, and the platform pays the processing fees.
OnlySecurity has 38,000+ members in 100 countries and is run by KSEC, which has been in security for 8 years
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Hands-on course catalogue
50+ practical courses on security, RFID and access control, Flipper Zero, Hak5 tools, IoT radio, wireless, magstripe and EMV.
Learning paths
Short courses in a set order for a role such as physical pentester or RFID assessor. Finishing a course earns its badge.
Verifiable portfolio
Badges and certificates build a learner profile that recruiters can check.
Free to join
Membership is free, and much of the catalogue is free to start.
Non-exclusive trainer marketplace
Instructors keep ownership of their courses, can also sell them elsewhere, and can withdraw them at any time.
Trainer revenue share
Trainers keep 75% to 90% of net sales depending on plan, and processing fees are paid by the platform.
It specialises in hands-on hardware and physical security (locks, RFID, Flipper Zero, Hak5, IoT radio), which most training platforms barely cover, and many of its courses are taught by the companies that make the tools.
Learners can start for free and learn skills they can show, through badges, a leaderboard and a portfolio recruiters can verify. Trainers get a non-exclusive licence and keep 75% to 90% of net sales with processing fees absorbed, where larger marketplaces can pay instructors far less after fees.
Penetration testers, red teamers, physical security assessors, RFID and IoT researchers, and hobbyists learning hardware hacking, plus security practitioners who want to teach and earn from their own courses.
OnlySecurity grew out of KSEC, a UK supplier of security research hardware. Customers kept asking how to get the most out of tools like the Proxmark, Flipper Zero and Hak5 gear, so KSEC started building practical courses alongside the hardware. That became an open platform where practitioners and hardware vendors teach, and where learners compete, train, learn and share.
We have collected here some useful links to help you find out if OnlySecurity is good.
Check the traffic stats of OnlySecurity on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of OnlySecurity on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of OnlySecurity's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of OnlySecurity on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
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