Register Size Calculator New

Find supply register, return grille, and filter grille sizes for any CFM, with face velocity checked against ACCA Manual D guidance.

Sound Level Meter New

Measure relative sound levels live from your microphone, with A/Z weighting and Fast/Slow response.

Rhythm Trainer New

Diagnose and train your sense of rhythm — beat, inner pulse, subdivision, and imitation — with millisecond timing feedback.

Voice Recorder New

Record from your microphone in the browser — trim, add echo or reverb, and download WAV, MP3, WebM, Opus, or M4A when available.

Breathing Timer Updated

Daily streaks: finish a session and the timer now remembers your run — come back tomorrow to grow a gentle streak badge (with your best run), stored only on your device. Plus a QR option in the share menu to send your exact breathing pattern to a phone.

Interval Timer Updated

Daily streaks: finish a workout and build a day-by-day streak badge with your best run — stored only on your device.

Visual Timer Updated

Daily streaks: complete a timer and build a day-by-day streak badge with your best run — stored only on your device, hidden in fullscreen and focus modes.

Image Watermark Updated

One-click rotation angle presets (-90° to 90°), plus two new guides, shareable settings links, and tooltips on every control

Velvet MD - Markdown Beautifier Updated

Color schemes now apply consistently across tables, code blocks, captions, task lists, and rendered Markdown elements

Online Tone Generator Updated

First-class waveform visualizer (now stable across sample rates), Signal engine dropdown, use-case hand-offs, tooltips

BMI

BMI Calculator Updated

7 new metrics, inline source citations