The operator's
training ground.
Solve CTF challenges, launch isolated live targets and sharpen your method. Offensive skills, trained where they belong: in our labs.
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One account, three surfaces
Built like a real engagement.
One flag per instance
Hosted challenges spawn a private instance with its own flag. Sharing flags gets nobody anywhere.
Isolated by design
Each instance runs sandboxed on a separate domain, with no outbound network and strict limits, then gets destroyed.
Eight ranks to Ghost
Points come from solves only. From Recruit to Ghost, the leaderboard stays honest.
- Recruit
- Operative
- Agent
- Operator
- Specialist
- Vanguard
- Phantom
- Ghost
Method over tricks
Sourced briefs, and a writeup that unlocks once you capture the flag.
Lab access.
One subscription unlocks every paid challenge, hosted instances, writeups and hints. Shown in USD, paid in crypto. No automatic renewal.
- Guided tutorial
- Free challenges
- Global leaderboard
- Every paid challenge
- Hosted live instances
- Writeups and hints
- Monthly exclusive challenge
- Profile perks
- Every paid challenge
- Hosted live instances
- Writeups and hints
- Monthly exclusive challenge
- Profile perks
- Every paid challenge
- Hosted live instances
- Writeups and hints
- Monthly exclusive challenge
- Profile perks
› Subscriptions open with the lab. Create your account now to be ready.
› Crypto payments are final. Prices in USD, converted at checkout.
Questions.
Do I need to pay to start?
No. A free account gets the guided tutorial and a set of free challenges. The subscription unlocks the rest.
What is a hosted instance?
Some challenges run as a live target launched just for you, on its own address, with a flag unique to that instance. It stays up for an hour and can be extended.
Which cryptocurrencies are accepted?
Checkout runs through a crypto payment processor that supports the major coins, including BTC, ETH, USDT and LTC.
Does the subscription renew automatically?
No. It simply ends after 30, 90 or 365 days. We email you three days before.
Which languages are supported?
The interface is available in English, French, Ukrainian, Chinese and Korean. Challenge content is published in English first.
What does stackd not do?
Everything offensive stays inside the training targets we build. No real-world targets, no stolen data, no ready-made weapons.
Your first flag is minutes away.
Create an account, follow the guided tutorial, capture your first flag.