HelvetiKit

25 developer utilities in one focused toolbox. HelvetiKit brings code, text, conversions, generators, and network diagnostics to iPhone, iPhone Duo, and iPad. Find tools by name or keyword, pin your favorites, and keep your input while switching tools during a session. SMART PASTE Use the system Paste button to recognize copied content and open a matching tool with your input ready. Recognition runs on your device. CODE AND TEXT - Format, minify, validate, sort, and convert JSON to YAML. - Decode JWT headers, payloads, and claims. Inspect expiry; signatures are not verified. - Test regular expressions with flags, capture groups, highlighting, and replacement. - Compare text line by line and highlight changed characters with Text Diff. - Count characters, words, lines, and bytes with Text Inspector. - Convert CSV to JSON and back with delimiter detection and table previews. - Sort, deduplicate, trim, quote, and join text with Line Tools. - Build and inspect Unix file permissions with Chmod. ENCODE AND HASH - Encode and decode Base64, including URL-safe and wrapped input. - Encode and decode URLs and escape or unescape strings. - Calculate text and file hashes, HMAC, and compare checksums. CONVERT AND GENERATE - Convert HEX, RGB, and HSL colors and check WCAG contrast ratios. - Convert large numbers between binary, octal, decimal, and hexadecimal. - Convert Unix timestamps and dates; follow a live Unix clock. - Change text case and inspect Cron schedules. - Generate UUID v4 and v7, passwords, and Lorem Ipsum. QR AND NETWORK TOOLS - Generate QR codes with selectable error correction, share images, and scan QR codes and barcodes with the camera or a photo. - Query DNS records using a choice of DNS-over-HTTPS resolvers. - View public IP information and local interface addresses. - Measure HTTP request latency with a timing breakdown. - Calculate IPv4 and IPv6 subnet details. A WORKSPACE THAT FITS Return to recent tools from Home. Use syntax-colored JSON and YAML, symbol input shortcuts, sample inputs, and regex presets. Choose your appearance and clear session data or recent tools in Settings. Compact navigation keeps tools close at hand. Wider layouts show the library beside your workspace and place input alongside results when space allows. Supports light and dark appearances, larger text, English, and Simplified Chinese. PRIVACY-MINDED BY DESIGN Local tools process input on your device. Recent tool input stays in memory during the app session. Network tools contact the selected resolver, lookup service, or host only when you run them. Camera and photo access are optional QR features. No separate app account is required. TRY IT, THEN GO PRO Try 10 tool runs for free. An optional one-time HelvetiKit Pro purchase unlocks unlimited runs. Restore Purchase is available in the Pro sheet.