Pendulum Wave 3D vs Keyclack

Eighteen pendulums, released at the same instant. A perfect line for a moment — then a wave, a fold, then no pattern at all. Sixty seconds later, a perfect line again. None of that is luck. Every pendulum is given a length that makes it swing an exact whole number of times per cycle, so the scattered part was never really a mess. It was the middle of a return. It is not a looping video, and not an animation faked to look about right. It is a live physics simulation, computed frame by frame while you watch. NOBODY WROTE THE MUSIC Turn the sound on, and each pendulum rings a note once per full swing, as it crosses the bottom — higher for the short ones, lower for the long ones. Only five notes of the scale are used (do, re, mi, so, la), spread across octaves, so they stay clear no matter how many sound at once. There is no composer here. The lengths are the melody. The moment everything lines up is the quietest one — all eighteen are at the far end of their arc, none of them crossing the bottom. A breath later, eighteen notes come down in a run, high to low, in under a fifth of a second. You are hearing exactly what you are watching. ANY ANGLE YOU LIKE Drag to put the camera anywhere. From an angle, a row of swinging pendulums. From directly above, a wave running along the row. The motion never changes. The angle does all the work. Four layouts: a straight Line; a Circle, where the wave travels around the ring; a Spiral winding outward; and a Grid, where the swing spreads like woven mesh — the more pendulums you add, the clearer the weave. Four color themes — Cool, Neon, Mono, Sunset. The bobs glow softly. Turn on Light trails in the Display panel, and each one leaves a line of light hanging in the air behind it. CINEMA MODE One tap: the controls disappear, the camera begins a slow orbit, and the ad goes with them. A waiting room screen, a tablet on the edge of a desk, a dark room late at night. It becomes something to look at, and nothing else. ALSO INSIDE • Set the number of pendulums, the cycle length, the swing angle and the speed • Save any setup you like as a preset • A data panel listing every pendulum's swings, length and period • "How it works" — the real explanation, in plain words, no equations • Available in 33 languages • No account, no sign-in. iPhone and iPad ABOUT THE ADS The app is free. There is one small banner at the bottom of the screen — no full-screen ads, no video ads — and in Cinema mode even that banner disappears. Before the first ad, the app asks you — on iPhone and iPad for permission to track; in Europe, a consent screen comes first. Accept, and ads may be matched to your interests; decline, and the banner still appears, simply unmatched. You can change your answer later: the consent in the app's settings, the tracking permission in iOS Settings. The app itself never asks for your name or email. To show the banner, Google AdMob uses standard advertising data (an advertising identifier and approximate location derived from your IP). See our Privacy Policy for details. Don't stop watching while it is scattered. Stay until it lines up again.

Press a keycap on screen and hear a real mechanical keyboard. The cap sinks, your phone taps back, and the sound lands — a toy you play with your ears. This is a keycap, not a keyboard. Build small clusters — one cap, or two, four, nine, sixteen — the way keycap keyrings and desk accessories actually come. ■ Who it's for · Anyone who loves typing sounds and keyboard ASMR · People stuck somewhere they can't actually type — a meeting room, a library, a quiet office · Keycap keyring collectors and custom keyboard fans · Anyone winding down with calm background noise before sleep · Restless hands that need something to press (a fidget toy that isn't silent) ■ 1. Twenty typing sounds Each sound was sampled from a different physical keyboard and analysed acoustically. Names describe the **measured timbre**, never a trademark — low centre frequencies are a "Thock", and as they climb you get "Clack" and "Click", while long decays become a "Ring" or a "Tail". Deep Resonance sits at 2382 Hz with a 29.3 ms decay; Dry Tail rings out the longest at 38.7 ms; Firm Click is short and sharp at 8198 Hz and 9.4 ms. The collection screen plots the full frequency response for every one. ■ 2. Twenty-three keycap sets — two-tone, plus novelty silhouettes PBT Beige, Charcoal, Paper White, Deep Teal, Dusk, Clay, Moss, Honey, Rose, Frost, Smoke, Graphite, Coral, Mint, Lavender, Sky, Bubblegum, Lime, Tangerine, Ice. Matte, glossy and translucent finishes, with centred, front-printed or blank legends. Every cluster gets one "hero cap" in its own colour, so a set reads as base + accent the way a real keycap set does, and the housing colour follows the caps. Three pastel sets go further and drop the square: Cream Cat, Peach Cat and Grape Cat. Cat-ear, heart, cloud and star caps sit in one tray in five pastel colours, and the case turns into translucent acrylic — the keycap keyring toy, moved onto the screen. ■ 3. Five clusters — 1, 2, 4, 9 and 16 caps The fewer the caps, the bigger each one gets: a single cap fills the screen, sixteen sit in a 4×4 grid. The hero cap isn't just a different colour — it plays its own stabiliser-weighted sample, the way a big key does on a real board. ■ 4. Two thousand three hundred builds 20 sounds × 23 caps × 5 clusters = 2,300 combinations. In the Craft tab you pick all three axes, watch the preview update, then commit with "Make this combo" — the board itself stays untouched while you experiment. The dice button picks one at random. ■ 5. A collection and 29 badges Every build you commit is filed in your collection. Twenty-nine badges track total presses, your longest unbroken run, your daily streak, and full sweeps of each axis, so there is always a next target within reach. Play at 3 a.m. and you earn Night Owl; play at dawn and you earn Early Bird. ■ 6. Tune it Independent control over volume, haptic strength (off, light, medium, strong) and the softer key-up sound. Repeat a key and the app rotates through alternate samples with slight pitch jitter, so it never sounds like one recording on loop. Light and dark themes, English and Korean, and your whole collection can be exported to a file and restored later. ■ Light and safe · This is not a keyboard app. It never replaces your system keyboard and cannot see anything you type · No account, no sign-in · Works fully offline · Asks for exactly one permission: vibration · Every sound was measured and processed from CC0-licensed source audio Go press a keycap. Privacy policy: https://reactiveworks.blogspot.com/2026/08/keyclack-privacy-policy.html