Scope
Breathing: the on-screen cycle is a voluntary 4-4-4-4 pacing animation, not a measurement of respiration, autonomic tone, oxygen or cortisol. Browser scheduling may drift in background tabs.
Data and responsibilities
Diary: the illustrative emotional balance index combines self-entered mood, sleep and water quantities with arbitrary weights for visualization. It is not validated, normed, diagnostic or suitable for health decisions.
Limitations
Focus: the 25/5 timer counts elapsed time and completed intervals, not sustained attention or cognitive performance. The emotion wheel supplies vocabulary and general reframing prompts, not psychotherapy.
Updates and contact
Telemetry: browser performance timing measures software behavior only. It cannot infer anxiety, stress physiology or neurological state. No clinical dataset, validation study or external biometrics are used.