Development tools
Web developer tools for making your dev tasks that litte bit easier.
8-Bit Chiptunes Creator
Create authentic 8-bit chiptunes music. Pattern sequencer, NES/C64/Game Boy sound chips, tracker interface, arpeggiator, effects, and WAV export. 30-300 second compositions.
Open tool →Assembly Instruction Visualiser (8086)
Type simple 8086 assembly, see the opcodes, step through execution, and watch registers and flags update in real time. Share links and export bytes.
Open tool →Binary Code Converter
Convert between binary, decimal, hexadecimal and text. Clean UK-friendly tool with live updates, spacing options, and shareable links.
Open tool →Color Contrast Checker - WCAG Compliance
Check color contrast ratios for WCAG AA and AAA compliance. Test accessibility, preview text samples, simulate color blindness, and generate accessibility reports.
Open tool →CSS Grid System Calculator
Generate responsive CSS grid systems with custom columns, gutters, and breakpoints. Visual preview, CSS code export, and flexible layout calculations for web design.
Open tool →Custom Stylesheet Generator - Build Your CSS
Generate custom CSS stylesheets by selecting only the components you need. Perfect for beginners - choose buttons, forms, typography, and more from popular frameworks.
Open tool →Dial-Up + ZX Loader Generator Pro
Generate epic 90s dial-up modem sounds with 80s ZX-style loading visuals. Extended durations up to 90 seconds. Play, customise, export WAV, and share. All in your browser.
Open tool →DOS 8.3 Filename Generator & Validator
Convert long filenames to DOS 8.3. Validate, normalise, and resolve collisions with a tilde suffix. Batch mode, copy link and CSV export.
Open tool →IP Subnet Calculator
Calculate IPv4 subnets from a CIDR or IP and subnet mask. Get network, broadcast, usable range, wildcard and host counts. Shareable links and CSV export.
Open tool →JWT Debugger - Decode & Inspect JSON Web Tokens
Debug and decode JWT tokens online. Inspect headers, payloads, claims, and validate token structure. Educational JWT tool for developers.
Open tool →Regex Tester - Test & Debug Regular Expressions
Test and debug regular expressions with real-time matching, visual explanations, and code generation. Supports JavaScript, PHP, Python regex flavors with pattern library.
Open tool →SFV / CRC32 Checker
Calculate CRC32 checksums and create or verify SFV files. Multi-file, drag-and-drop, copyable results and export, all client-side.
Open tool →SQL Query Builder - Visual Database Query Generator
Build SQL queries visually with our interactive query builder. Supports SELECT, INSERT, UPDATE, DELETE with JOIN operations, subqueries, and multiple SQL dialects.
Open tool →ZX Spectrum Tape Loader Pro
Ultimate ZX Spectrum tape loader simulator. Multiple games, authentic loading screens, pilot tones, data blocks, loading errors, and turbo loaders. 30-300 second sequences with WAV export.
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