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.

Development

Gray Code and Thermometer BCD Encoder Visualizer

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.

Development

Game Save Viewer

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.

Development

Windows PE / Linux ELF / Mach-O Binary Header, Section, Import & Export Inspector

Upload a PE-COFF (.exe/.dll), ELF or Mach-O binary and parse its headers end to end: DOS/PE signature, COFF machine, optional header (entry point, image base, subsystem, ASLR/NX/CFG), section table with RVA↔offset mapping, import/export directories, ELF program headers and PIE detection, dynamic symbols and DT_NEEDED, Mach-O load commands and dylibs — with cross-architecture annotations and a hex preview.

Network

HTTP Link Header RFC 8288 Parser and Pagination Crawler Preview

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.

Network

DNSSEC Chain & RDAP Trust Auditor

Audit a domain end to end: IANA RDAP bootstrap referral, registry/registrar WHOIS data, and the DNSSEC chain of trust from the root KSK through the TLD DS to the apex DNSKEY — with DS digest verification and RRSIG expiry flags.

Development

Java Regex Tester

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.

Network

Request Replay & Clock Skew Correction for Distributed Systems

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).

Development

Responsive Picture / srcset Art Direction Builder

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.

Development

HTTP Cache-Control CDN Edge TTL Budget Optimizer

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.

Development

Responsive Breakpoint Visual Diff

Render a URL at multiple viewport widths and inspect screenshots, pixel-difference heatmaps, and layout metrics in the page.

Development

JSON Diff Visualizer

Compare two JSON payloads and render a visual HTML diff with path-level additions, removals, changes, and statistics