Tools
Things I have built: an open-source security testing platform, a cybersecurity course, and a few financial calculators that run entirely in your browser.
Security
ShakerScan
Open-source (AGPL-3.0) security testing platform for web apps, APIs, AI systems and connected devices: deterministic DAST scans, an AI-assisted Hunt driven by your own coding agent, continuous attack-surface monitoring, AI Gate tests for chat, RAG, agent and MCP endpoints, model-artifact intake and device posture checks. Self-hosted in Docker with a web UI, REST API and CLI.
shakerscan.com ↗SEC101
An interactive course on everyday cybersecurity: passwords, MFA, phishing, browser privacy, devices, safe tools, and networking basics. In Ukrainian.
sec101.a3sec.net ↗ УкраїнськаFinancial Tools
Typed into a form, your numbers never leave your browser. Opened from a prefilled link, they travel in the address (and are then removed from it). Sent through the API or MCP, they are processed and not stored, but appear in the access log like any request. AI agents and developers: see llms.txt for the JS engines and URL parameters.
Salary & Tax Calculator
Estimate take-home pay and your effective tax rate for a US or Canadian salary, with 2025 rates and CAD/USD conversion.
Open calculatorMortgage Calculator
US and Canada: monthly payment, PMI or CMHC insurance, property tax by state or province, land transfer tax, amortization, and extra payments, with charts and PDF export.
Open calculator English / УкраїнськаRetirement Calculator
Project your nest egg and monthly retirement income from savings, contributions, growth, and inflation, in nominal or real terms.
Open calculator