Contact

What is worth sending

• Wrong results. The most valuable message anyone can send. Include the exact input you used, what the tool returned, and what you expected — with the input, a bug can usually be reproduced immediately.
• Accessibility problems. If something is unreachable by keyboard, unclear to a screen reader, or a colour pair is hard to read, that counts as a bug here and is treated as one.
• Corrections to the explanations. Each tool carries a fair amount of reference material about cron syntax, WCAG thresholds, timezone handling and the like. If any of it is wrong, misleading or out of date, please say so — ideally with a pointer to the specification or source.
• Missing presets or pages. If there is an obvious schedule, aspect ratio, platform or recurring date that ought to be covered and is not, suggestions are welcome.
• Rendering problems. A layout that breaks in a particular browser or at a particular width is useful to know about. Mentioning the browser, version and screen width helps a lot.

What to expect

This is an independent project rather than a supported product, so there is no guaranteed response time and no ticketing system. Clear bug reports get the most attention, because they are the ones that can be acted on.

A few things this address is not for: there is no paid support, no newsletter and no mailing list to join. Guest posts, link exchanges, sponsored content and SEO offers are not accepted and will not receive a reply.

Anything you send is used only to answer you and to fix the problem you describe. It is not added to any list, not shared with anyone, and not used for anything else. See the privacy page for the rest.

Before you write

If your question is about how a particular tool works, its own page probably answers it already — each one includes a detailed explanation of the underlying method, worked examples and a FAQ covering the mistakes people make most often.

• JSON Formatter & ValidatorFormatting, validation errors with line and column, and the tree view.
• Cron Expression GeneratorCron field syntax, step and range values, and what the next runs will be.
• Aspect Ratio CalculatorSolving for width, height or ratio, and the standard resolutions.
• Unix Timestamp ConverterSeconds versus milliseconds, timezones, and batch conversion.
• Days UntilDate differences, live countdowns and recurring events.
• WCAG Contrast CheckerContrast ratios, AA and AAA thresholds, and large-text rules.
• Regex Cookbook & TesterCopy-paste patterns, a plain-English explainer, and a live tester with match highlighting.
• SMPTE Timecode ConverterTimecode, frames and real time at every broadcast rate, drop-frame included.
• Prometheus Cardinality EstimatorActive series from your labels, and the disk that needs over a retention window.
• Diff Checker & Text CompareLine-by-line differences between two blocks of text, with ignore options.
• Mic TestLive input level meter, device picker, and why a mic can read as silent.
• Webcam TestLive preview, actual resolution and frame rate, and why a camera can be black.
• Keyboard TesterKey highlighting, rollover and ghosting, and key/code/keyCode values.
• Monitor & Dead Pixel TestFullscreen patterns, the stuck-pixel flasher, and dead vs stuck pixels.
• Reaction Time TestMeasuring reaction time in the browser, and what the number depends on.
• CPS TestClicks per second over a chosen window, and what limits the rate.
• Spacebar CounterCounting presses and timed speed mode, with auto-repeat filtered out.
• Grade CalculatorWeighted averages and the final-exam formula, and how scales vary.
• GPA CalculatorThe 4.0 scale, weighted vs unweighted, and cumulative GPA.
• Case ConverterThe case styles, how words are split, and acronym/non-ASCII limits.
• Remove Line BreaksThe cleanup options, and the paragraph-preserving join.
• Text RepeaterSeparators, numbering, and the output length cap.
• Lorem Ipsum GeneratorParagraph/sentence/word counts and the plain vs HTML output.
• UUID GeneratorUUID v4 vs v7, the bit layout, and bulk formatting options.
• Wheel SpinnerHow the random pick works and how the wheel lands on it.
• Random Team GeneratorBalanced team splitting by count or size, and the shuffle.
• Image CompressorBrowser-side JPEG/PNG/WebP re-encoding, and format trade-offs.
• Image ResizerExact dimensions or percentage, aspect lock, and export formats.
• Favicon GeneratorThe favicon sizes, the multi-resolution .ico, and the link snippet.
• Tier List MakerPlacing tiles by click/tap/keyboard, and exporting the board as a PNG.
• Tone GeneratorFrequencies, waveforms, and the nearest-note and cents readout.
• Hearing TestThe high-frequency ladder, and why it is not a medical test.
• CSS Gradient GeneratorLinear, radial and conic gradients and the CSS they produce.
• CSS Box-Shadow GeneratorOffset, blur, spread, inset and layering multiple shadows.
• Gamepad TesterButtons, sticks, triggers, rumble, and stick-drift/deadzone.
• Mouse TesterButtons, scroll, double-click chatter and polling rate.
• Mouse Sensitivity ConverterYaw-based conversion, eDPI and cm/360, and the yaw table.
• Aim TrainerFlick/grid modes, accuracy and speed, and the best score.
• Pixel Circle GeneratorCircle/oval rasterisation, block counts, thin vs thick.
• Fancy Text GeneratorThe Unicode styles, where they work, and accessibility.
• Discord Font GeneratorWhat works in Discord names/bios vs the username field.
• Invisible CharacterWhich blank characters survive on which platforms.
• Symbol & Emoji Copy-PasteCategories, search, and cross-platform glyph rendering.
• Zalgo / Cursed TextCombining marks, intensity, and stripping them back off.
• Word UnscramblerWildcards, grouping by length, and the dictionary used.
• Anagram SolverExact vs sub-anagrams, and the shared word list.
• Wordle SolverThe green/yellow/grey filter and the duplicate-letter rule.
• Tile Word FinderThe two scoring systems, blanks, and board-hook filters.
• Would You RatherThe categories, the pick tally, and the question bank.
• Truth or DareThe two games, the categories, and the family-friendly bank.
• Band Name GeneratorGenres, name patterns, and seeding with your own word.
• Username GeneratorStyles, numbers/separators, and why it can't check availability.
• Bingo Card Generator75/90-ball and word modes, unique cards, and printing/PDF.
• TeleprompterScroll speed, mirror mode, and the optional local recording.
• Screen RecorderScreen/tab capture, mic audio, formats and browser support.
• Virtual PianoThe keyboard mapping, octaves, sustain and how notes are made.
• Guitar TunerThe tunings, the cents needle, and honest accuracy limits.
• EXIF Viewer & RemoverWhich tags are read, GPS privacy, and how stripping works.
• JWT DecoderDecoding vs verifying, the claims, and the expiry check.