Pricing
Start free. Upgrade when you want every module and the full kata library.
Free
$0 forever
- TCP Connection Lifecycle simulator
- BGP Session Lifecycle simulator
- First 2 katas per module
- Diagnostic assessment
- All additional modules
- Full kata library
- Progress dashboard
Pro
$99 / year
Per engineer, billed annually
- Everything in Free
- Full kata library — every kata across all live modules
- Progress dashboard + weak-area analysis
- Every new module the day it ships
The library is complete: All 25 modules in the plan have shipped — each with its simulator, its kernel citations, its server-computed cascade and its katas. See the catalog →
Team pricing: $199/yr per seat. [email protected]
What you're paying for isn't videos. Every simulated behavior is validated against the real open-source source — the Linux kernel, FRR, BoringSSL — and a server-side correlation engine computes how one layer's state cascades into the next. You're buying a kernel-accurate mental model you can debug from.
Questions
- Refunds?
- 14 days, no questions asked — email [email protected] and we refund in full.
- Invoices & tax?
- Checkout is handled by Lemon Squeezy (our merchant of record), so VAT/sales tax is calculated for you and you get a proper invoice.
- Which modules do I get, and what happens to the roadmap?
- All 25 modules are live now: TCP, BGP, OSPF, NAT, DNS, TLS, HTTP/2, the URL Journey, HTML Parsing, the CSS Cascade, JavaScript Execution, the Render & Paint Pipeline, HAProxy load balancing, Nginx proxying, database connection pooling, CDN & edge caching, IPSec & IKEv2, PKI & Certificate Chains, Post-Quantum Cryptography, RPKI & BGP Security, Network Firewall & Netfilter and DDoS & Rate Limiting. Nothing is listed as coming later, because nothing is outstanding — the roadmap is finished rather than paused. Your subscription covers the full library today, and any module added after this point at no extra cost.