Development
Price a throwaway sandbox across AWS, GCP, Azure, Vercel, Fly.io, Railway, Replit, Codespaces and Gitpod, then audit what forgetting to tear it down actually costs per forgotten day.
ephemeral-cloud-sandbox-cost-calculator-teardown-auditor-aws-gcp-azure-vercel-flyDevelopment
Convert an N-bit value to binary, Gray, one-hot and thermometer codes with a counting truth table, Hamming-distance chart and Verilog/VHDL encoder stubs.
gray-code-and-thermometer-bcd-encoder-visualizerDevelopment
Drop any game save file — Minecraft NBT, Unreal Engine GVAS, Palworld containers, JSON/XML/INI/Lua text saves, SQLite profiles — and get the detected format, engine versions, key progress fields and a bounded structural tree.
game-save-viewerDevelopment
Statically analyze a pytest conftest.py chain: render the fixture dependency graph across all five scopes (function/class/module/package/session), detect deeper-conftest overrides, ScopeMismatch edges, and cross-test state pollution — mock.patch().start() without .stop(), monkeypatch leaking from broad-scope fixtures, and with mock.patch held open across yield.
pytest-conftest-fixture-dependency-graph-and-mock-patch-leak-detectorDevelopment
Simulate the Authorization Code flow with PKCE end to end: verifier/challenge generation, authorization URL, token exchange, ID Token validation checklist and an interception-attack demo.
oauth-oidc-authorization-code-pkce-flow-visualizerNetwork
Parse RFC 8288 Link headers with the spec appendix-B algorithm, resolve relative URI-references against a base URL, classify rel types against the IANA registry, validate preload/prefetch hints, and simulate how a rel="next" pagination crawler walks your responses — including cycle detection.
http-link-header-rfc8288-parser-and-pagination-crawler-previewDevelopment
Test java.util.regex patterns online: (?<name>…) named groups, possessive quantifiers and atomic groups, Pattern flags, ASCII vs UNICODE_CHARACTER_CLASS \d semantics, and ready-to-paste Java code.
java-regex-testerDevelopment
Test Python re patterns online: (?P<name>…) named groups, (?P=name) backreferences, VERBOSE patterns, findall behavior, and \g<name> replace templates — plus ready-to-paste Python code.
python-regex-testerNetwork
Parse a raw HTTP request or curl command, estimate client↔server clock skew from the response Date header (NTP-style midpoint formula), inspect timestamp credentials (X-Amz-Date, x-ms-date, X-Timestamp, JWT iat/nbf), replay with ±skew offsets and diff the results against real tolerance windows (AWS SigV4 ±15 min, Azure, OAuth, JWT leeway).
request-replay-clock-skew-correction-distributed-systemsDevelopment
Build complete <picture> markup with art-directed crops: per-breakpoint <source media> elements, 1x/2x density candidates or {w}-template width descriptors, optional AVIF/WebP format layers, sizes handling, CLS-safe width/height, plus HTML and JSX flavors with spec-based lint notes.
responsive-picture-srcset-art-direction-builderDevelopment
Analyze Cache-Control directives, calculate browser/shared-cache TTL and stale budgets, detect directive conflicts, and compare static behavior notes for generic HTTP, Fastly, Cloudflare, and Akamai.
http-cache-control-cdn-edge-ttl-budget-optimizerDevelopment
Render a URL at multiple viewport widths and inspect screenshots, pixel-difference heatmaps, and layout metrics in the page.
responsive-breakpoint-diff