XCOM.DEV

Tooling · zero install · runs in the tab

Tools

Browser utilities for hardware & payload work.

Small, self-contained utilities that use modern browser APIs directly — no native app to install, nothing sent to a server. Serial and BLE terminals for bring-up, and calculators for checksums, byte order, entropy and encoding. Every byte stays in your tab.

Bluetooth LE · Web Bluetooth

BLE Terminal

Connect over Bluetooth Low Energy to the Nordic UART Service (NUS), Microchip Transparent UART, TI SPS or Silicon Labs SPP-over-BLE and view/send ASCII or hex. Ideal for radio-only MCUs.

/ble-terminal.html → UART / USB · Web Serial

Serial Terminal

Connect to a USB/UART serial port at any baud rate, with configurable data bits, parity and stop bits. View ASCII or a hex dump and send text or raw hex. The classic firmware console.

/serial-terminal.html → Checksums · frame integrity

CRC Calculator

Compute CRC-8, CRC-16 (CCITT, MODBUS, XMODEM, ARC) and CRC-32/32C over text or hex, with the exact parameters shown. Verify a received CRC in one click.

/tools/crc.html → Numeric bases · byte order

Number & Endian Converter

One value across hex, decimal, binary, octal and ASCII — plus little- and big-endian byte layouts for 8/16/32/64-bit integers and IEEE-754 float decode.

/tools/number-converter.html → Payload triage · Shannon

Entropy Analyzer

Measure the Shannon entropy of text or hex to gauge randomness: near 8.0 means encrypted/compressed, mid range means text or packed code. Includes a byte-distribution histogram.

/tools/entropy.html → Encoding · base64/hex/URL

Payload Encoder / Decoder

Convert between plaintext, base64, hex, URL encoding and HTML entities — bidirectionally, with chaining to unwind nested encodings in suspicious strings.

/tools/encoder.html → Cryptography · CNSA / Suite B

Crypto Toolkit

SHA-2 hashing, HMAC, AES-GCM authenticated encryption and PBKDF2 key derivation built on the NSA CNSA / Suite B algorithm set — all via the Web Crypto API, with a reference table of the suite.

/tools/nsa-crypto.html → Embedded engineering · calculators

Embedded Tools →

The companion family: power, passives & filters, digital protocols and PCB calculators — Ohm's law, buck/boost, Sallen-Key, AWG, IPC track current, microstrip and more.

/embedded-tools.html →

The two terminals require a Chromium-based desktop browser (Chrome, Edge, Brave, Opera) over https:// and use secure-context APIs. The calculators, converter, entropy and encoder tools run in any modern browser and never send data anywhere.