JavaScript Live Tester - Online Run & Debug Snippets
Write JavaScript code and see the output or console.log results immediately. Safe iframe sandbox. For quick experiments.
UD5 Toolkit
Write JavaScript code and see the output or console.log results immediately. Safe iframe sandbox. For quick experiments.
Enter a URL and see a waterfall of external scripts with their download size and execution time estimate. Identify performance culprits.
Evaluate the strength of your passwords with a visual meter and detailed feedback. Check for length, complexity, and breached passwords. All analysis is client-side.
Tune your guitar using the browser microphone. Detects pitch and shows deviation from standard tuning. No installation, pure client-side audio processing.
Paste text to see a live letter frequency bar chart. Helps break substitution ciphers. All local analysis.
Convert numbers between binary, octal, decimal, and hexadecimal bases. See real-time conversion as you type. Clean and simple programmer utility.
Convert decimal numbers to their hexadecimal equivalents. Support for large integers. Fast and handy for low-level programming reference.
Rotate and view the 3D shapes of s, p, d, and f orbitals. Great for teaching quantum mechanics. WebGL‑based.
Drag a virtual mineral across common items to understand scratch hardness. Interactive learning for jewelers.
Enter a MIDI note number (0–127) or a musical note name and get the exact frequency in Hz. Piano keyboard picker.
Transform English text into pseudolocalized text with accents, expansion, and brackets. Test your UI's readiness for translation.
Convert between Base32 encoded strings and hexadecimal. Work with low‑level data representations. All local.
Enter a CDN URL for a script or style and generate the integrity attribute with sha384 or sha512. Protect your site.
Press keys on your physical keyboard and see them highlighted on a virtual keyboard. Detects multi-key rollover. Quick hardware check.
Create a humorous fake GitHub profile screenshot with custom name, stars, and languages. Pure canvas prank.
Enter a hex color and hear a tone mapped to its hue. Explore the connection between color and sound. Fun perceptual experiment.
Build a Vite configuration file by selecting plugins (Vue, React, etc.), aliases, and build options. Copy the final code.
Select item rarity and consumable state to get a price range based on Dungeon Master's Guide tables. Quick reference.
Encode or decode data to/from Base58 (Bitcoin alphabet). Useful for cryptocurrency address generation testing. Fully local, no data sent.
Analyze letter/symbol frequency with an interactive bar chart and heatmap. Useful for breaking simple ciphers, linguistics, and SEO keyword analysis. Local processing.
Generate strong random strings for API tokens, session secrets, or encryption keys. Uses crypto.getRandomValues().
Derive a strong cryptographic key from a password using PBKDF2 with SHA‑256. Adjust iterations and salt. Educational and test tool.
Paste a Bitcoin, Ethereum, or other crypto wallet address and quickly verify its format and checksum. No connection to blockchain.