Sorvelin is a quiet sensory app for iPhone and iPad. You drag a small probe across a dark, moving wave field. Buried in the noise are hidden resonance nodes — points where the waves stack into a stable peak. The field does not tell you where they are. Three feedback channels converge as you get closer: the particles align, the oscillators bend toward unison, and the haptic grain thickens under your finger. When all three lock, you have found one. A small bloom, a chord, a quiet pulse. The node leaves a ghost-mark, and the hunt continues. There is no score. No timer. No failure state. No language. No menus to navigate while you are in the field. Sorvelin teaches through feedback alone. DESIGNED WITH THE SPECTRUM IN MIND Sorvelin was built around things often missing from sensory and casual apps: • No win condition, no failure state, no comparison to others • No notifications, no advertising, no friend list, no chat • No reading required — the field is language-agnostic by design • Three Sensory Presets (Standard, Soft, Calm) re-tune motion, haptics, and audio together with one tap • Per-channel sliders if a single dimension needs to come down further The result is a space that rewards slow attention, repetition, and quiet focus — useful for self-regulation moments, transitions, or just a few minutes of low-stimulation play. THREE TIDAL REGIONS You don't unlock content. You drift between fields of increasing depth: • Shallows — two generators, slow dynamics, a strong gradient • Open Ocean — three or four generators, moderate dynamics • The Deep — four or five generators, drifting nodes, weak gradient BUILT ON REAL WAVE PHYSICS • Multiple sine wave generators sampled per frame under your finger • Resonance nodes are constructive-interference peaks discovered when the field loads, so the field stays smooth and immediate • Continuous Core Haptics grain on iPhone, modulated in real time • Live AVAudioEngine oscillator bank — no recorded audio, all sample accurate PRIVACY, RESPECT, SIMPLICITY Sorvelin contains no third-party analytics SDK, no advertising, no account system, no network code. Nothing leaves your device. The app runs in airplane mode exactly the same as online. It is free, with no in-app purchases and no subscriptions. iPhone (iPhone 8 and later for haptics) and iPad. iOS 26.5 or later. If you find Sorvelin useful — for yourself, for a child, for a classroom — get in touch. Quiet feedback is the kind that matters.