For technical support, feedback, or bug reports, contact us via email:
goloubov@gmail.com
Support inquiries are typically reviewed and answered within 24–48 hours.
Never practice breath-holding (apnea) in or near water without certified, direct one-on-one supervision. Breath-holding in pools, lakes, oceans, or bathtubs without dedicated safety divers creates an extreme risk of Shallow Water Blackout (SWB), Loss of Motor Control (LMC), and fatal drowning.
All breath-hold routines and interval timers in EssentialTimer are intended strictly for dry, seated, or lying down practice on a soft, safe surface. EssentialTimer is an athletic training timer and does not provide medical advice. Consult a physician before undertaking rigorous interval training or hypoxia conditioning.
EssentialTimer is a high-performance, fully customizable interval timing and audio-guided companion designed for freedivers, breathwork practitioners, fitness athletes, and everyday timing.
Yes. EssentialTimer is 100% free. There are no in-app purchases, recurring subscription fees, auto-renewing charges, or locked features. No credit card or billing management is ever required.
In the main menu, select Voice Cues to choose your preferred studio voice coach (10 HD voices available in American and British accents). During active workout timers, you can toggle between Voice Prompts, Beep Mode, or Mute directly using the sound control button.
O₂ Table (Oxygen Tolerance): Increases hold duration by your selected increment every round while keeping rest constant to train hypoxia tolerance.
CO₂ Table (Carbon Dioxide Tolerance): Decreases rest duration by your selected decrement every round while keeping hold constant to train hypercapnia tolerance.
During hold phases, tap the diaphragm contraction button to record contractions directly into your session analytics.
Yes. EssentialTimer is built with native audio mixing. Voice cues and countdown beeps mix seamlessly over Spotify, Apple Music, podcasts, or audiobooks without stopping your playback.
100% of your workout history, timer configurations, personal bests, and custom photos reside strictly on your local device. We do not operate remote user accounts, databases, or cloud servers, and we never collect or sell personal data.
You can export a machine-readable JSON copy of your history by tapping Export JSON in the History tab. You can also permanently wipe all local history, photos, and settings instantly via Privacy Policy & Terms → Clear Data, or by uninstalling the app from your device.